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git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@10900 626c5289-ae23-0410-ae9c-e8d60b6d4f22
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William S Fulton 2008-11-03 13:37:28 +00:00
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Makefile
ccache
*gz
config.h
config.log
config.status
tca.log
tca.map

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GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.
675 Mass Ave, Cambridge, MA 02139, USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
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Yoyodyne, Inc., hereby disclaims all copyright interest in the program
`Gnomovision' (which makes passes at compilers) written by James Hacker.
<signature of Ty Coon>, 1 April 1989
Ty Coon, President of Vice
This General Public License does not permit incorporating your program into
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consider it more useful to permit linking proprietary applications with the
library. If this is what you want to do, use the GNU Library General
Public License instead of this License.

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srcdir=@srcdir@
VPATH=@srcdir@
prefix=@prefix@
exec_prefix=@exec_prefix@
bindir=@bindir@
mandir=@mandir@
INSTALLCMD=@INSTALL@
CC=@CC@
CFLAGS=@CFLAGS@ -I.
EXEEXT=@EXEEXT@
OBJS= ccache.o mdfour.o hash.o execute.o util.o args.o stats.o \
cleanup.o snprintf.o unify.o
HEADERS = ccache.h mdfour.h
all: ccache$(EXEEXT)
docs: ccache.1 web/ccache-man.html
ccache$(EXEEXT): $(OBJS) $(HEADERS)
$(CC) $(CFLAGS) -o $@ $(OBJS)
ccache.1: ccache.yo
-yodl2man -o ccache.1 ccache.yo
web/ccache-man.html: ccache.yo
mkdir -p man
yodl2html -o web/ccache-man.html ccache.yo
install: ccache$(EXEEXT) ccache.1
${INSTALLCMD} -d $(DESTDIR)${bindir}
${INSTALLCMD} -m 755 ccache$(EXEEXT) $(DESTDIR)${bindir}
${INSTALLCMD} -d $(DESTDIR)${mandir}/man1
${INSTALLCMD} -m 644 ${srcdir}/ccache.1 $(DESTDIR)${mandir}/man1/
clean:
/bin/rm -f $(OBJS) *~ ccache$(EXEEXT)
test: test.sh
CC='$(CC)' ./test.sh
check: test
distclean: clean
/bin/rm -f Makefile config.h config.sub config.log build-stamp config.status
# FIXME: To fix this, test.sh needs to be able to take ccache from the
# installed prefix, not from the source dir.
installcheck:
@echo "WARNING! This is not really \"installcheck\" yet."
$(MAKE) check

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This is a re-implementation of "compilercache" in C
The original compilercache scripts were by Erik Thiele
(erikyyy@erikyyy.de) and I would like to thank him for an excellent
piece of work. See http://www.erikyyy.de/compilercache/ for the
original shell scripts.
I wrote ccache because I wanted to get a bit more speed out of a
compiler cache and I wanted to remove some of the limitations of the
shell-script version.
Please see the manual page and documentation at
http://ccache.samba.org/
INSTALLATION
------------
Please run:
./configure
make
make install
then read the ccache manual page
-----------
Andrew Tridgell
http://samba.org/~tridge/
bugs@ccache.samba.org

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/*
convenient routines for argument list handling
Copyright (C) Andrew Tridgell 2002
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "ccache.h"
ARGS *args_init(int init_argc, char **init_args)
{
ARGS *args;
int i;
args = (ARGS *)x_malloc(sizeof(ARGS));
args->argc = 0;
args->argv = (char **)x_malloc(sizeof(char *));
args->argv[0] = NULL;
for (i=0;i<init_argc;i++) {
args_add(args, init_args[i]);
}
return args;
}
void args_add(ARGS *args, const char *s)
{
args->argv = (char**)x_realloc(args->argv, (args->argc + 2) * sizeof(char *));
args->argv[args->argc] = x_strdup(s);
args->argc++;
args->argv[args->argc] = NULL;
}
/* pop the last element off the args list */
void args_pop(ARGS *args, int n)
{
while (n--) {
args->argc--;
free(args->argv[args->argc]);
args->argv[args->argc] = NULL;
}
}
/* remove the first element of the argument list */
void args_remove_first(ARGS *args)
{
free(args->argv[0]);
memmove(&args->argv[0],
&args->argv[1],
args->argc * sizeof(args->argv[0]));
args->argc--;
}
/* add an argument into the front of the argument list */
void args_add_prefix(ARGS *args, const char *s)
{
args->argv = (char**)x_realloc(args->argv, (args->argc + 2) * sizeof(char *));
memmove(&args->argv[1], &args->argv[0],
(args->argc+1) * sizeof(args->argv[0]));
args->argv[0] = x_strdup(s);
args->argc++;
}
/* strip any arguments beginning with the specified prefix */
void args_strip(ARGS *args, const char *prefix)
{
int i;
for (i=0; i<args->argc; ) {
if (strncmp(args->argv[i], prefix, strlen(prefix)) == 0) {
free(args->argv[i]);
memmove(&args->argv[i],
&args->argv[i+1],
args->argc * sizeof(args->argv[i]));
args->argc--;
} else {
i++;
}
}
}

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.TH "ccache" "1" "April 2002" "" ""
.SH "NAME"
ccache \- a fast compiler cache
.SH "SYNOPSIS"
.PP
ccache [OPTION]
.PP
ccache <compiler> [COMPILER OPTIONS]
.PP
<compiler> [COMPILER OPTIONS]
.PP
.SH "DESCRIPTION"
.PP
ccache is a compiler cache\&. It speeds up re-compilation of C/C++ code
by caching previous compiles and detecting when the same compile is
being done again\&.
.PP
.SH "OPTIONS SUMMARY"
.PP
Here is a summary of the options to ccache\&.
.PP
.nf
-s show statistics summary
-z zero statistics
-c run a cache cleanup
-C clear the cache completely
-F <maxfiles> set maximum files in cache
-M <maxsize> set maximum size of cache (use G, M or K)
-h this help page
-V print version number
.fi
.PP
.SH "OPTIONS"
.PP
These options only apply when you invoke ccache as "ccache"\&. When
invoked as a compiler none of these options apply\&. In that case your
normal compiler options apply and you should refer to your compilers
documentation\&.
.PP
.IP "\fB-h\fP"
Print a options summary page
.IP
.IP "\fB-s\fP"
Print the current statistics summary for the cache\&. The
statistics are stored spread across the subdirectories of the
cache\&. Using "ccache -s" adds up the statistics across all
subdirectories and prints the totals\&.
.IP
.IP "\fB-z\fP"
Zero the cache statistics\&.
.IP
.IP "\fB-V\fP"
Print the ccache version number
.IP
.IP "\fB-c\fP"
Clean the cache and re-calculate the cache file count and
size totals\&. Normally the -c option should not be necessary as ccache
keeps the cache below the specified limits at runtime and keeps
statistics up to date on each compile\&. This option is mostly useful
if you manually modify the cache contents or believe that the cache
size statistics may be inaccurate\&.
.IP
.IP "\fB-C\fP"
Clear the entire cache, removing all cached files\&.
.IP
.IP "\fB-F maxfiles\fP"
This sets the maximum number of files allowed in
the cache\&. The value is stored inside the cache directory and applies
to all future compiles\&. Due to the way the value is stored the actual
value used is always rounded down to the nearest multiple of 16\&.
.IP
.IP "\fB-M maxsize\fP"
This sets the maximum cache size\&. You can specify
a value in gigabytes, megabytes or kilobytes by appending a G, M or K
to the value\&. The default is gigabytes\&. The actual value stored is
rounded down to the nearest multiple of 16 kilobytes\&.
.IP
.PP
.SH "INSTALLATION"
.PP
There are two ways to use ccache\&. You can either prefix your compile
commands with "ccache" or you can create a symbolic link between
ccache and the names of your compilers\&. The first method is most
convenient if you just want to try out ccache or wish to use it for
some specific projects\&. The second method is most useful for when you
wish to use ccache for all your compiles\&.
.PP
To install for usage by the first method just copy ccache to somewhere
in your path\&.
.PP
To install for the second method do something like this:
.nf
cp ccache /usr/local/bin/
ln -s /usr/local/bin/ccache /usr/local/bin/gcc
ln -s /usr/local/bin/ccache /usr/local/bin/g++
ln -s /usr/local/bin/ccache /usr/local/bin/cc
.fi
This will work as long as /usr/local/bin comes before the path to gcc
(which is usually in /usr/bin)\&. After installing you may wish to run
"which gcc" to make sure that the correct link is being used\&.
.PP
Note! Do not use a hard link, use a symbolic link\&. A hardlink will
cause "interesting" problems\&.
.PP
.SH "EXTRA OPTIONS"
.PP
When run as a compiler front end ccache usually just takes the same
command line options as the compiler you are using\&. The only exception
to this is the option \&'--ccache-skip\&'\&. That option can be used to tell
ccache that the next option is definitely not a input filename, and
should be passed along to the compiler as-is\&.
.PP
The reason this can be important is that ccache does need to parse the
command line and determine what is an input filename and what is a
compiler option, as it needs the input filename to determine the name
of the resulting object file (among other things)\&. The heuristic
ccache uses in this parse is that any string on the command line that
exists as a file is treated as an input file name (usually a C
file)\&. By using --ccache-skip you can force an option to not be
treated as an input file name and instead be passed along to the
compiler as a command line option\&.
.PP
.SH "ENVIRONMENT VARIABLES"
.PP
ccache uses a number of environment variables to control operation\&. In
most cases you won\&'t need any of these as the defaults will be fine\&.
.PP
.IP
.IP "\fBCCACHE_DIR\fP"
the CCACHE_DIR environment variable specifies
where ccache will keep its cached compiler output\&. The default is
"$HOME/\&.ccache"\&.
.IP
.IP "\fBCCACHE_TEMPDIR\fP"
the CCACHE_TEMPDIR environment variable specifies
where ccache will put temporary files\&. The default is the same as
CCACHE_DIR\&. Note that the CCACHE_TEMPDIR path must be on the same
filesystem as the CCACHE_DIR path, so that renames of files between
the two directories can work\&.
.IP
.IP "\fBCCACHE_LOGFILE\fP"
If you set the CCACHE_LOGFILE environment
variable then ccache will write some log information on cache hits
and misses in that file\&. This is useful for tracking down problems\&.
.IP
.IP "\fBCCACHE_PATH\fP"
You can optionally set CCACHE_PATH to a colon
separated path where ccache will look for the real compilers\&. If you
don\&'t do this then ccache will look for the first executable matching
the compiler name in the normal PATH that isn\&'t a symbolic link to
ccache itself\&.
.IP
.IP "\fBCCACHE_CC\fP"
You can optionally set CCACHE_CC to force the name
of the compiler to use\&. If you don\&'t do this then ccache works it out
from the command line\&.
.IP
.IP "\fBCCACHE_PREFIX\fP"
This option adds a prefix to the command line
that ccache runs when invoking the compiler\&. Also see the section
below on using ccache with distcc\&.
.IP
.IP "\fBCCACHE_DISABLE\fP"
If you set the environment variable
CCACHE_DISABLE then ccache will just call the real compiler,
bypassing the cache completely\&.
.IP
.IP "\fBCCACHE_READONLY\fP"
the CCACHE_READONLY environment variable
tells ccache to attempt to use existing cached object files, but not
to try to add anything new to the cache\&. If you are using this because
your CCACHE_DIR is read-only, then you may find that you also need to
set CCACHE_TEMPDIR as otherwise ccache will fail to create the
temporary files\&.
.IP
.IP "\fBCCACHE_CPP2\fP"
If you set the environment variable CCACHE_CPP2
then ccache will not use the optimisation of avoiding the 2nd call to
the pre-processor by compiling the pre-processed output that was used
for finding the hash in the case of a cache miss\&. This is primarily a
debugging option, although it is possible that some unusual compilers
will have problems with the intermediate filename extensions used in
this optimisation, in which case this option could allow ccache to be
used\&.
.IP
.IP "\fBCCACHE_NOSTATS\fP"
If you set the environment variable
CCACHE_NOSTATS then ccache will not update the statistics files on
each compile\&.
.IP
.IP "\fBCCACHE_NLEVELS\fP"
The environment variable CCACHE_NLEVELS allows
you to choose the number of levels of hash in the cache directory\&. The
default is 2\&. The minimum is 1 and the maximum is 8\&.
.IP
.IP "\fBCCACHE_HARDLINK\fP"
If you set the environment variable
CCACHE_HARDLINK then ccache will attempt to use hard links from the
cache directory when creating the compiler output rather than using a
file copy\&. Using hard links is faster, but can confuse programs like
\&'make\&' that rely on modification times\&.
.IP
.IP "\fBCCACHE_RECACHE\fP"
This forces ccache to not use any cached
results, even if it finds them\&. New results are still cached, but
existing cache entries are ignored\&.
.IP
.IP "\fBCCACHE_UMASK\fP"
This sets the umask for ccache and all child
processes (such as the compiler)\&. This is mostly useful when you wish
to share your cache with other users\&. Note that this also affects the
file permissions set on the object files created from your
compilations\&.
.IP
.IP "\fBCCACHE_HASHDIR\fP"
This tells ccache to hash the current working
directory when calculating the hash that is used to distinguish two
compiles\&. This prevents a problem with the storage of the current
working directory in the debug info of a object file, which can lead
ccache to give a cached object file that has the working directory in
the debug info set incorrectly\&. This option is off by default as the
incorrect setting of this debug info rarely causes problems\&. If you
strike problems with gdb not using the correct directory then enable
this option\&.
.IP
.IP "\fBCCACHE_UNIFY\fP"
If you set the environment variable CCACHE_UNIFY
then ccache will use the C/C++ unifier when hashing the pre-processor
output if -g is not used in the compile\&. The unifier is slower than a
normal hash, so setting this environment variable loses a little bit
of speed, but it means that ccache can take advantage of not
recompiling when the changes to the source code consist of
reformatting only\&. Note that using CCACHE_UNIFY changes the hash, so
cached compiles with CCACHE_UNIFY set cannot be used when
CCACHE_UNIFY is not set and vice versa\&. The reason the unifier is off
by default is that it can give incorrect line number information in
compiler warning messages\&.
.IP
.IP "\fBCCACHE_EXTENSION\fP"
Normally ccache tries to automatically
determine the extension to use for intermediate C pre-processor files
based on the type of file being compiled\&. Unfortunately this sometimes
doesn\&'t work, for example when using the aCC compiler on HP-UX\&. On
systems like this you can use the CCACHE_EXTENSION option to override
the default\&. On HP-UX set this environment variable to "i" if you use
the aCC compiler\&.
.IP
.PP
.SH "CACHE SIZE MANAGEMENT"
.PP
By default ccache has a one gigabyte limit on the cache size and no
maximum number of files\&. You can set a different limit using the
"ccache -M" and "ccache -F" options, which set the size and number of
files limits\&.
.PP
When these limits are reached ccache will reduce the cache to 20%
below the numbers you specified in order to avoid doing the cache
clean operation too often\&.
.PP
.SH "HOW IT WORKS"
.PP
The basic idea is to detect when you are compiling exactly the same
code a 2nd time and use the previously compiled output\&. You detect
that it is the same code by forming a hash of:
.PP
.IP o
the pre-processor output from running the compiler with -E
.IP o
the command line options
.IP o
the real compilers size and modification time
.IP o
any stderr output generated by the compiler
.PP
These are hashed using md4 (a strong hash) and a cache file is formed
based on that hash result\&. When the same compilation is done a second
time ccache is able to supply the correct compiler output (including
all warnings etc) from the cache\&.
.PP
ccache has been carefully written to always produce exactly the same
compiler output that you would get without the cache\&. If you ever
discover a case where ccache changes the output of your compiler then
please let me know\&.
.PP
.SH "USING CCACHE WITH DISTCC"
.PP
distcc is a very useful program for distributing compilation across a
range of compiler servers\&. It is often useful to combine distcc with
ccache, so that compiles that are done are sped up by distcc, but that
ccache avoids the compile completely where possible\&.
.PP
To use distcc with ccache I recommend using the CCACHE_PREFIX
option\&. You just need to set the environment variable CCACHE_PREFIX to
\&'distcc\&' and ccache will prefix the command line used with the
compiler with the command \&'distcc\&'\&.
.PP
.SH "SHARING A CACHE"
.PP
A group of developers can increase the cache hit rate by sharing a
cache directory\&. The hard links however cause unwanted side effects,
as all links to a cached file share the file\&'s modification timestamp\&.
This results in false dependencies to be triggered by timestamp-based
build systems whenever another user links to an existing
file\&. Typically, users will see that their libraries and binaries are
relinked without reason\&. To share a cache without side effects, the
following conditions need to be met:
.PP
.IP o
Use the same \fBCCACHE_DIR\fP environment variable setting
.IP o
Set the \fBCCACHE_NOLINK\fP environment variable
.IP o
Make sure everyone sets the CCACHE_UMASK environment variable
to 002, this ensures that cached files are accessible to everyone in
the group\&.
.IP o
Make sure that all users have write permission in the entire
cache directory (and that you trust all users of the shared cache)\&.
.IP o
Make sure that the setgid bit is set on all directories in the
cache\&. This tells the filesystem to inherit group ownership for new
directories\&. The command "chmod g+s `find $CCACHE_DIR -type d`" might
be useful for this\&.
.PP
.SH "HISTORY"
.PP
ccache was inspired by the compilercache shell script script written
by Erik Thiele and I would like to thank him for an excellent piece of
work\&. See
http://www\&.erikyyy\&.de/compilercache/
for the Erik\&'s scripts\&.
.PP
I wrote ccache because I wanted to get a bit more speed out of a
compiler cache and I wanted to remove some of the limitations of the
shell-script version\&.
.PP
.SH "DIFFERENCES FROM COMPILERCACHE"
.PP
The biggest differences between Erik\&'s compilercache script and ccache
are:
.IP o
ccache is written in C, which makes it a bit faster (calling out to
external programs is mostly what slowed down the scripts)\&.
.IP o
ccache can automatically find the real compiler
.IP o
ccache keeps statistics on hits/misses
.IP o
ccache can do automatic cache management
.IP o
ccache can cache compiler output that includes warnings\&. In many
cases this gives ccache a much higher cache hit rate\&.
.IP o
ccache can handle a much wider ranger of compiler options
.IP o
ccache avoids a double call to cpp on a cache miss
.PP
.SH "BUGS"
.PP
When the cache is stored on an NFS filesystem, the filesystem must be
exported with the \fBno_subtree_check\fP option to make renames between
directories reliable\&.
.PP
.SH "CREDITS"
.PP
Thanks to the following people for their contributions to ccache
.IP o
Erik Thiele for the original compilercache script
.IP o
Luciano Rocha for the idea of compiling the pre-processor output
to avoid a 2nd cpp pass
.IP o
Paul Russell for many suggestions and the debian packaging
.PP
.SH "AUTHOR"
.PP
ccache was written by Andrew Tridgell
http://samba\&.org/~tridge/
.PP
If you wish to report a problem or make a suggestion then please email
bugs@ccache\&.samba\&.org
.PP
ccache is released under the GNU General Public License version 2 or
later\&. Please see the file COPYING for license details\&.

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#define CCACHE_VERSION "2.4"
#include "config.h"
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/mman.h>
#include <sys/file.h>
#include <fcntl.h>
#include <time.h>
#include <string.h>
#include <ctype.h>
#include <utime.h>
#include <stdarg.h>
#include <dirent.h>
#include <limits.h>
#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
#define STATUS_NOTFOUND 3
#define STATUS_FATAL 4
#define STATUS_NOCACHE 5
#define MYNAME "ccache"
#define LIMIT_MULTIPLE 0.8
/* default maximum cache size */
#ifndef DEFAULT_MAXSIZE
#define DEFAULT_MAXSIZE (1000*1000)
#endif
enum stats {
STATS_NONE=0,
STATS_STDOUT,
STATS_STATUS,
STATS_ERROR,
STATS_TOCACHE,
STATS_PREPROCESSOR,
STATS_COMPILER,
STATS_MISSING,
STATS_CACHED,
STATS_ARGS,
STATS_LINK,
STATS_NUMFILES,
STATS_TOTALSIZE,
STATS_MAXFILES,
STATS_MAXSIZE,
STATS_NOTC,
STATS_DEVICE,
STATS_NOINPUT,
STATS_MULTIPLE,
STATS_CONFTEST,
STATS_UNSUPPORTED,
STATS_OUTSTDOUT,
STATS_END
};
typedef unsigned uint32;
#include "mdfour.h"
void hash_start(void);
void hash_string(const char *s);
void hash_int(int x);
void hash_file(const char *fname);
char *hash_result(void);
void hash_buffer(const char *s, int len);
void cc_log(const char *format, ...);
void fatal(const char *msg);
void copy_fd(int fd_in, int fd_out);
int copy_file(const char *src, const char *dest);
int create_dir(const char *dir);
void x_asprintf(char **ptr, const char *format, ...);
char *x_strdup(const char *s);
void *x_realloc(void *ptr, size_t size);
void *x_malloc(size_t size);
void traverse(const char *dir, void (*fn)(const char *, struct stat *));
char *str_basename(const char *s);
char *dirname(char *s);
int lock_fd(int fd);
size_t file_size(struct stat *st);
int safe_open(const char *fname);
char *x_realpath(const char *path);
char *gnu_getcwd(void);
int create_empty_file(const char *fname);
const char *get_home_directory(void);
void stats_update(enum stats stat);
void stats_zero(void);
void stats_summary(void);
void stats_tocache(size_t size);
void stats_read(const char *stats_file, unsigned counters[STATS_END]);
void stats_set_limits(long maxfiles, long maxsize);
size_t value_units(const char *s);
void display_size(unsigned v);
void stats_set_sizes(const char *dir, size_t num_files, size_t total_size);
int unify_hash(const char *fname);
#ifndef HAVE_VASPRINTF
int vasprintf(char **, const char *, va_list );
#endif
#ifndef HAVE_ASPRINTF
int asprintf(char **ptr, const char *format, ...);
#endif
#ifndef HAVE_SNPRINTF
int snprintf(char *,size_t ,const char *, ...);
#endif
void cleanup_dir(const char *dir, size_t maxfiles, size_t maxsize);
void cleanup_all(const char *dir);
void wipe_all(const char *dir);
int execute(char **argv,
const char *path_stdout,
const char *path_stderr);
char *find_executable(const char *name, const char *exclude_name);
typedef struct {
char **argv;
int argc;
} ARGS;
ARGS *args_init(int , char **);
void args_add(ARGS *args, const char *s);
void args_add_prefix(ARGS *args, const char *s);
void args_pop(ARGS *args, int n);
void args_strip(ARGS *args, const char *prefix);
void args_remove_first(ARGS *args);
#if HAVE_COMPAR_FN_T
#define COMPAR_FN_T __compar_fn_t
#else
typedef int (*COMPAR_FN_T)(const void *, const void *);
#endif
/* work with silly DOS binary open */
#ifndef O_BINARY
#define O_BINARY 0
#endif
/* mkstemp() on some versions of cygwin don't handle binary files, so
override */
#ifdef __CYGWIN__
#undef HAVE_MKSTEMP
#endif

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mailto(bugs@ccache.samba.org)
manpage(ccache)(1)(April 2002)()()
manpagename(ccache)(a fast compiler cache)
manpagesynopsis()
ccache [OPTION]
ccache <compiler> [COMPILER OPTIONS]
<compiler> [COMPILER OPTIONS]
manpagedescription()
ccache is a compiler cache. It speeds up re-compilation of C/C++ code
by caching previous compiles and detecting when the same compile is
being done again.
manpagesection(OPTIONS SUMMARY)
Here is a summary of the options to ccache.
verb(
-s show statistics summary
-z zero statistics
-c run a cache cleanup
-C clear the cache completely
-F <maxfiles> set maximum files in cache
-M <maxsize> set maximum size of cache (use G, M or K)
-h this help page
-V print version number
)
manpageoptions()
These options only apply when you invoke ccache as "ccache". When
invoked as a compiler none of these options apply. In that case your
normal compiler options apply and you should refer to your compilers
documentation.
startdit()
dit(bf(-h)) Print a options summary page
dit(bf(-s)) Print the current statistics summary for the cache. The
statistics are stored spread across the subdirectories of the
cache. Using "ccache -s" adds up the statistics across all
subdirectories and prints the totals.
dit(bf(-z)) Zero the cache statistics.
dit(bf(-V)) Print the ccache version number
dit(bf(-c)) Clean the cache and re-calculate the cache file count and
size totals. Normally the -c option should not be necessary as ccache
keeps the cache below the specified limits at runtime and keeps
statistics up to date on each compile. This option is mostly useful
if you manually modify the cache contents or believe that the cache
size statistics may be inaccurate.
dit(bf(-C)) Clear the entire cache, removing all cached files.
dit(bf(-F maxfiles)) This sets the maximum number of files allowed in
the cache. The value is stored inside the cache directory and applies
to all future compiles. Due to the way the value is stored the actual
value used is always rounded down to the nearest multiple of 16.
dit(bf(-M maxsize)) This sets the maximum cache size. You can specify
a value in gigabytes, megabytes or kilobytes by appending a G, M or K
to the value. The default is gigabytes. The actual value stored is
rounded down to the nearest multiple of 16 kilobytes.
enddit()
manpagesection(INSTALLATION)
There are two ways to use ccache. You can either prefix your compile
commands with "ccache" or you can create a symbolic link between
ccache and the names of your compilers. The first method is most
convenient if you just want to try out ccache or wish to use it for
some specific projects. The second method is most useful for when you
wish to use ccache for all your compiles.
To install for usage by the first method just copy ccache to somewhere
in your path.
To install for the second method do something like this:
verb(
cp ccache /usr/local/bin/
ln -s /usr/local/bin/ccache /usr/local/bin/gcc
ln -s /usr/local/bin/ccache /usr/local/bin/g++
ln -s /usr/local/bin/ccache /usr/local/bin/cc
)
This will work as long as /usr/local/bin comes before the path to gcc
(which is usually in /usr/bin). After installing you may wish to run
"which gcc" to make sure that the correct link is being used.
Note! Do not use a hard link, use a symbolic link. A hardlink will
cause "interesting" problems.
manpagesection(EXTRA OPTIONS)
When run as a compiler front end ccache usually just takes the same
command line options as the compiler you are using. The only exception
to this is the option '--ccache-skip'. That option can be used to tell
ccache that the next option is definitely not a input filename, and
should be passed along to the compiler as-is.
The reason this can be important is that ccache does need to parse the
command line and determine what is an input filename and what is a
compiler option, as it needs the input filename to determine the name
of the resulting object file (among other things). The heuristic
ccache uses in this parse is that any string on the command line that
exists as a file is treated as an input file name (usually a C
file). By using --ccache-skip you can force an option to not be
treated as an input file name and instead be passed along to the
compiler as a command line option.
manpagesection(ENVIRONMENT VARIABLES)
ccache uses a number of environment variables to control operation. In
most cases you won't need any of these as the defaults will be fine.
startdit()
dit(bf(CCACHE_DIR)) the CCACHE_DIR environment variable specifies
where ccache will keep its cached compiler output. The default is
"$HOME/.ccache".
dit(bf(CCACHE_TEMPDIR)) the CCACHE_TEMPDIR environment variable specifies
where ccache will put temporary files. The default is the same as
CCACHE_DIR. Note that the CCACHE_TEMPDIR path must be on the same
filesystem as the CCACHE_DIR path, so that renames of files between
the two directories can work.
dit(bf(CCACHE_LOGFILE)) If you set the CCACHE_LOGFILE environment
variable then ccache will write some log information on cache hits
and misses in that file. This is useful for tracking down problems.
dit(bf(CCACHE_PATH)) You can optionally set CCACHE_PATH to a colon
separated path where ccache will look for the real compilers. If you
don't do this then ccache will look for the first executable matching
the compiler name in the normal PATH that isn't a symbolic link to
ccache itself.
dit(bf(CCACHE_CC)) You can optionally set CCACHE_CC to force the name
of the compiler to use. If you don't do this then ccache works it out
from the command line.
dit(bf(CCACHE_PREFIX)) This option adds a prefix to the command line
that ccache runs when invoking the compiler. Also see the section
below on using ccache with distcc.
dit(bf(CCACHE_DISABLE)) If you set the environment variable
CCACHE_DISABLE then ccache will just call the real compiler,
bypassing the cache completely.
dit(bf(CCACHE_READONLY)) the CCACHE_READONLY environment variable
tells ccache to attempt to use existing cached object files, but not
to try to add anything new to the cache. If you are using this because
your CCACHE_DIR is read-only, then you may find that you also need to
set CCACHE_TEMPDIR as otherwise ccache will fail to create the
temporary files.
dit(bf(CCACHE_CPP2)) If you set the environment variable CCACHE_CPP2
then ccache will not use the optimisation of avoiding the 2nd call to
the pre-processor by compiling the pre-processed output that was used
for finding the hash in the case of a cache miss. This is primarily a
debugging option, although it is possible that some unusual compilers
will have problems with the intermediate filename extensions used in
this optimisation, in which case this option could allow ccache to be
used.
dit(bf(CCACHE_NOSTATS)) If you set the environment variable
CCACHE_NOSTATS then ccache will not update the statistics files on
each compile.
dit(bf(CCACHE_NLEVELS)) The environment variable CCACHE_NLEVELS allows
you to choose the number of levels of hash in the cache directory. The
default is 2. The minimum is 1 and the maximum is 8.
dit(bf(CCACHE_HARDLINK)) If you set the environment variable
CCACHE_HARDLINK then ccache will attempt to use hard links from the
cache directory when creating the compiler output rather than using a
file copy. Using hard links is faster, but can confuse programs like
'make' that rely on modification times.
dit(bf(CCACHE_RECACHE)) This forces ccache to not use any cached
results, even if it finds them. New results are still cached, but
existing cache entries are ignored.
dit(bf(CCACHE_UMASK)) This sets the umask for ccache and all child
processes (such as the compiler). This is mostly useful when you wish
to share your cache with other users. Note that this also affects the
file permissions set on the object files created from your
compilations.
dit(bf(CCACHE_HASHDIR)) This tells ccache to hash the current working
directory when calculating the hash that is used to distinguish two
compiles. This prevents a problem with the storage of the current
working directory in the debug info of a object file, which can lead
ccache to give a cached object file that has the working directory in
the debug info set incorrectly. This option is off by default as the
incorrect setting of this debug info rarely causes problems. If you
strike problems with gdb not using the correct directory then enable
this option.
dit(bf(CCACHE_UNIFY)) If you set the environment variable CCACHE_UNIFY
then ccache will use the C/C++ unifier when hashing the pre-processor
output if -g is not used in the compile. The unifier is slower than a
normal hash, so setting this environment variable loses a little bit
of speed, but it means that ccache can take advantage of not
recompiling when the changes to the source code consist of
reformatting only. Note that using CCACHE_UNIFY changes the hash, so
cached compiles with CCACHE_UNIFY set cannot be used when
CCACHE_UNIFY is not set and vice versa. The reason the unifier is off
by default is that it can give incorrect line number information in
compiler warning messages.
dit(bf(CCACHE_EXTENSION)) Normally ccache tries to automatically
determine the extension to use for intermediate C pre-processor files
based on the type of file being compiled. Unfortunately this sometimes
doesn't work, for example when using the aCC compiler on HP-UX. On
systems like this you can use the CCACHE_EXTENSION option to override
the default. On HP-UX set this environment variable to "i" if you use
the aCC compiler.
enddit()
manpagesection(CACHE SIZE MANAGEMENT)
By default ccache has a one gigabyte limit on the cache size and no
maximum number of files. You can set a different limit using the
"ccache -M" and "ccache -F" options, which set the size and number of
files limits.
When these limits are reached ccache will reduce the cache to 20%
below the numbers you specified in order to avoid doing the cache
clean operation too often.
manpagesection(HOW IT WORKS)
The basic idea is to detect when you are compiling exactly the same
code a 2nd time and use the previously compiled output. You detect
that it is the same code by forming a hash of:
itemize(
it() the pre-processor output from running the compiler with -E
it() the command line options
it() the real compilers size and modification time
it() any stderr output generated by the compiler
)
These are hashed using md4 (a strong hash) and a cache file is formed
based on that hash result. When the same compilation is done a second
time ccache is able to supply the correct compiler output (including
all warnings etc) from the cache.
ccache has been carefully written to always produce exactly the same
compiler output that you would get without the cache. If you ever
discover a case where ccache changes the output of your compiler then
please let me know.
manpagesection(USING CCACHE WITH DISTCC)
distcc is a very useful program for distributing compilation across a
range of compiler servers. It is often useful to combine distcc with
ccache, so that compiles that are done are sped up by distcc, but that
ccache avoids the compile completely where possible.
To use distcc with ccache I recommend using the CCACHE_PREFIX
option. You just need to set the environment variable CCACHE_PREFIX to
'distcc' and ccache will prefix the command line used with the
compiler with the command 'distcc'.
manpagesection(SHARING A CACHE)
A group of developers can increase the cache hit rate by sharing a
cache directory. The hard links however cause unwanted side effects,
as all links to a cached file share the file's modification timestamp.
This results in false dependencies to be triggered by timestamp-based
build systems whenever another user links to an existing
file. Typically, users will see that their libraries and binaries are
relinked without reason. To share a cache without side effects, the
following conditions need to be met:
itemize(
it() Use the same bf(CCACHE_DIR) environment variable setting
it() Set the bf(CCACHE_NOLINK) environment variable
it() Make sure everyone sets the CCACHE_UMASK environment variable
to 002, this ensures that cached files are accessible to everyone in
the group.
it() Make sure that all users have write permission in the entire
cache directory (and that you trust all users of the shared cache).
it() Make sure that the setgid bit is set on all directories in the
cache. This tells the filesystem to inherit group ownership for new
directories. The command "chmod g+s `find $CCACHE_DIR -type d`" might
be useful for this.
)
manpagesection(HISTORY)
ccache was inspired by the compilercache shell script script written
by Erik Thiele and I would like to thank him for an excellent piece of
work. See
url(http://www.erikyyy.de/compilercache/)(http://www.erikyyy.de/compilercache/)
for the Erik's scripts.
I wrote ccache because I wanted to get a bit more speed out of a
compiler cache and I wanted to remove some of the limitations of the
shell-script version.
manpagesection(DIFFERENCES FROM COMPILERCACHE)
The biggest differences between Erik's compilercache script and ccache
are:
itemize(
it() ccache is written in C, which makes it a bit faster (calling out to
external programs is mostly what slowed down the scripts).
it() ccache can automatically find the real compiler
it() ccache keeps statistics on hits/misses
it() ccache can do automatic cache management
it() ccache can cache compiler output that includes warnings. In many
cases this gives ccache a much higher cache hit rate.
it() ccache can handle a much wider ranger of compiler options
it() ccache avoids a double call to cpp on a cache miss
)
manpagesection(BUGS)
When the cache is stored on an NFS filesystem, the filesystem must be
exported with the bf(no_subtree_check) option to make renames between
directories reliable.
manpagesection(CREDITS)
Thanks to the following people for their contributions to ccache
itemize(
it() Erik Thiele for the original compilercache script
it() Luciano Rocha for the idea of compiling the pre-processor output
to avoid a 2nd cpp pass
it() Paul Russell for many suggestions and the debian packaging
)
manpageauthor()
ccache was written by Andrew Tridgell
url(http://samba.org/~tridge/)(http://samba.org/~tridge/)
If you wish to report a problem or make a suggestion then please email
bugs@ccache.samba.org
ccache is released under the GNU General Public License version 2 or
later. Please see the file COPYING for license details.

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/*
Copyright (C) Andrew Tridgell 2002
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
functions to cleanup the cache directory when it gets too large
*/
#include "ccache.h"
static struct files {
char *fname;
time_t mtime;
size_t size;
} **files;
static unsigned allocated;
static unsigned num_files;
static size_t total_size;
static size_t total_files;
static size_t size_threshold;
static size_t files_threshold;
/* file comparison function to try to delete the oldest files first */
static int files_compare(struct files **f1, struct files **f2)
{
if ((*f2)->mtime == (*f1)->mtime) {
return strcmp((*f2)->fname, (*f1)->fname);
}
if ((*f2)->mtime > (*f1)->mtime) {
return -1;
}
return 1;
}
/* this builds the list of files in the cache */
static void traverse_fn(const char *fname, struct stat *st)
{
char *p;
if (!S_ISREG(st->st_mode)) return;
p = str_basename(fname);
if (strcmp(p, "stats") == 0) {
free(p);
return;
}
free(p);
if (num_files == allocated) {
allocated = 10000 + num_files*2;
files = (struct files **)x_realloc(files,
sizeof(struct files *)*allocated);
}
files[num_files] = (struct files *)x_malloc(sizeof(struct files));
files[num_files]->fname = x_strdup(fname);
files[num_files]->mtime = st->st_mtime;
files[num_files]->size = file_size(st) / 1024;
total_size += files[num_files]->size;
num_files++;
}
/* sort the files we've found and delete the oldest ones until we are
below the thresholds */
static void sort_and_clean(void)
{
unsigned i;
if (num_files > 1) {
/* sort in ascending data order */
qsort(files, num_files, sizeof(struct files *),
(COMPAR_FN_T)files_compare);
}
/* delete enough files to bring us below the threshold */
for (i=0;i<num_files; i++) {
if ((size_threshold==0 || total_size < size_threshold) &&
(files_threshold==0 || (num_files-i) < files_threshold)) break;
if (unlink(files[i]->fname) != 0 && errno != ENOENT) {
fprintf(stderr, "unlink %s - %s\n",
files[i]->fname, strerror(errno));
continue;
}
total_size -= files[i]->size;
}
total_files = num_files - i;
}
/* cleanup in one cache subdir */
void cleanup_dir(const char *dir, size_t maxfiles, size_t maxsize)
{
unsigned i;
size_threshold = maxsize * LIMIT_MULTIPLE;
files_threshold = maxfiles * LIMIT_MULTIPLE;
num_files = 0;
total_size = 0;
/* build a list of files */
traverse(dir, traverse_fn);
/* clean the cache */
sort_and_clean();
stats_set_sizes(dir, total_files, total_size);
/* free it up */
for (i=0;i<num_files;i++) {
free(files[i]->fname);
free(files[i]);
files[i] = NULL;
}
if (files) free(files);
allocated = 0;
files = NULL;
num_files = 0;
total_size = 0;
}
/* cleanup in all cache subdirs */
void cleanup_all(const char *dir)
{
unsigned counters[STATS_END];
char *dname, *sfile;
int i;
for (i=0;i<=0xF;i++) {
x_asprintf(&dname, "%s/%1x", dir, i);
x_asprintf(&sfile, "%s/%1x/stats", dir, i);
memset(counters, 0, sizeof(counters));
stats_read(sfile, counters);
cleanup_dir(dname,
counters[STATS_MAXFILES],
counters[STATS_MAXSIZE]);
free(dname);
free(sfile);
}
}
/* traverse function for wiping files */
static void wipe_fn(const char *fname, struct stat *st)
{
char *p;
if (!S_ISREG(st->st_mode)) return;
p = str_basename(fname);
if (strcmp(p, "stats") == 0) {
free(p);
return;
}
free(p);
unlink(fname);
}
/* wipe all cached files in all subdirs */
void wipe_all(const char *dir)
{
char *dname;
int i;
for (i=0;i<=0xF;i++) {
x_asprintf(&dname, "%s/%1x", dir, i);
traverse(dir, wipe_fn);
free(dname);
}
/* and fix the counters */
cleanup_all(dir);
}

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/* config.h.in. Generated from configure.in by autoheader. */
/* Define to 1 if you have the `asprintf' function. */
#undef HAVE_ASPRINTF
/* */
#undef HAVE_C99_VSNPRINTF
/* */
#undef HAVE_COMPAR_FN_T
/* Define to 1 if you have the <ctype.h> header file. */
#undef HAVE_CTYPE_H
/* Define to 1 if you have the <dirent.h> header file, and it defines `DIR'.
*/
#undef HAVE_DIRENT_H
/* Define to 1 if you have the `gethostname' function. */
#undef HAVE_GETHOSTNAME
/* Define to 1 if you have the <inttypes.h> header file. */
#undef HAVE_INTTYPES_H
/* Define to 1 if you have the <memory.h> header file. */
#undef HAVE_MEMORY_H
/* Define to 1 if you have the `mkstemp' function. */
#undef HAVE_MKSTEMP
/* Define to 1 if you have the <ndir.h> header file, and it defines `DIR'. */
#undef HAVE_NDIR_H
/* Define to 1 if you have the `realpath' function. */
#undef HAVE_REALPATH
/* Define to 1 if you have the `snprintf' function. */
#undef HAVE_SNPRINTF
/* Define to 1 if you have the <stdint.h> header file. */
#undef HAVE_STDINT_H
/* Define to 1 if you have the <stdlib.h> header file. */
#undef HAVE_STDLIB_H
/* Define to 1 if you have the <strings.h> header file. */
#undef HAVE_STRINGS_H
/* Define to 1 if you have the <string.h> header file. */
#undef HAVE_STRING_H
/* Define to 1 if you have the <sys/dir.h> header file, and it defines `DIR'.
*/
#undef HAVE_SYS_DIR_H
/* Define to 1 if you have the <sys/ndir.h> header file, and it defines `DIR'.
*/
#undef HAVE_SYS_NDIR_H
/* Define to 1 if you have the <sys/stat.h> header file. */
#undef HAVE_SYS_STAT_H
/* Define to 1 if you have the <sys/types.h> header file. */
#undef HAVE_SYS_TYPES_H
/* Define to 1 if you have <sys/wait.h> that is POSIX.1 compatible. */
#undef HAVE_SYS_WAIT_H
/* Define to 1 if you have the <unistd.h> header file. */
#undef HAVE_UNISTD_H
/* Define to 1 if you have the `vasprintf' function. */
#undef HAVE_VASPRINTF
/* Define to 1 if you have the `vsnprintf' function. */
#undef HAVE_VSNPRINTF
/* Define to the address where bug reports for this package should be sent. */
#undef PACKAGE_BUGREPORT
/* Define to the full name of this package. */
#undef PACKAGE_NAME
/* Define to the full name and version of this package. */
#undef PACKAGE_STRING
/* Define to the one symbol short name of this package. */
#undef PACKAGE_TARNAME
/* Define to the version of this package. */
#undef PACKAGE_VERSION
/* Define to 1 if you have the ANSI C header files. */
#undef STDC_HEADERS
/* Define to 1 if you can safely include both <sys/time.h> and <time.h>. */
#undef TIME_WITH_SYS_TIME
/* Define _GNU_SOURCE so that we get all necessary prototypes */
#undef _GNU_SOURCE

4896
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72
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dnl Process this file with autoconf to produce a configure script.
AC_INIT()
AC_PREREQ(2.52)
AC_MSG_NOTICE([Configuring ccache])
AC_CONFIG_HEADER(config.h)
dnl Checks for programs.
AC_PROG_CC
AC_PROG_CPP
AC_PROG_INSTALL
AC_DEFINE([_GNU_SOURCE], 1,
[Define _GNU_SOURCE so that we get all necessary prototypes])
# If GCC, turn on warnings.
if test "x$GCC" = "xyes"
then
CFLAGS="$CFLAGS -Wall -W"
else
CFLAGS="$CFLAGS -O"
fi
AC_HEADER_DIRENT
AC_HEADER_TIME
AC_HEADER_SYS_WAIT
AC_CHECK_HEADERS(ctype.h strings.h stdlib.h string.h pwd.h)
AC_CHECK_FUNCS(realpath snprintf vsnprintf vasprintf asprintf mkstemp)
AC_CHECK_FUNCS(gethostname getpwuid)
AC_CACHE_CHECK([for compar_fn_t in stdlib.h],ccache_cv_COMPAR_FN_T, [
AC_TRY_COMPILE(
[#include <stdlib.h>],
[
void test_fn(void) { qsort(NULL, 0, 0, (__compar_fn_t)NULL); }
],
ccache_cv_COMPAR_FN_T=yes,ccache_cv_COMPAR_FN_T=no)])
if test x"$ccache_cv_COMPAR_FN_T" = x"yes"; then
AC_DEFINE(HAVE_COMPAR_FN_T, 1, [ ])
fi
AC_CACHE_CHECK([for C99 vsnprintf],ccache_cv_HAVE_C99_VSNPRINTF,[
AC_TRY_RUN([
#include <sys/types.h>
#include <stdarg.h>
void foo(const char *format, ...) {
va_list ap;
int len;
char buf[5];
va_start(ap, format);
len = vsnprintf(0, 0, format, ap);
va_end(ap);
if (len != 5) exit(1);
if (snprintf(buf, 3, "hello") != 5 || strcmp(buf, "he") != 0) exit(1);
exit(0);
}
main() { foo("hello"); }
],
ccache_cv_HAVE_C99_VSNPRINTF=yes,ccache_cv_HAVE_C99_VSNPRINTF=no,ccache_cv_HAVE_C99_VSNPRINTF=cross)])
if test x"$ccache_cv_HAVE_C99_VSNPRINTF" = x"yes"; then
AC_DEFINE(HAVE_C99_VSNPRINTF, 1, [ ])
fi
AC_CONFIG_FILES([Makefile])
AC_OUTPUT

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/*
Copyright (C) Andrew Tridgell 2002
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "ccache.h"
/*
execute a compiler backend, capturing all output to the given paths
the full path to the compiler to run is in argv[0]
*/
int execute(char **argv,
const char *path_stdout,
const char *path_stderr)
{
pid_t pid;
int status;
pid = fork();
if (pid == -1) fatal("Failed to fork");
if (pid == 0) {
int fd;
unlink(path_stdout);
fd = open(path_stdout, O_WRONLY|O_CREAT|O_TRUNC|O_EXCL|O_BINARY, 0666);
if (fd == -1) {
exit(STATUS_NOCACHE);
}
dup2(fd, 1);
close(fd);
unlink(path_stderr);
fd = open(path_stderr, O_WRONLY|O_CREAT|O_TRUNC|O_EXCL|O_BINARY, 0666);
if (fd == -1) {
exit(STATUS_NOCACHE);
}
dup2(fd, 2);
close(fd);
exit(execv(argv[0], argv));
}
if (waitpid(pid, &status, 0) != pid) {
fatal("waitpid failed");
}
if (WEXITSTATUS(status) == 0 && WIFSIGNALED(status)) {
return -1;
}
return WEXITSTATUS(status);
}
/*
find an executable by name in $PATH. Exclude any that are links to exclude_name
*/
char *find_executable(const char *name, const char *exclude_name)
{
char *path;
char *tok;
struct stat st1, st2;
if (*name == '/') {
return x_strdup(name);
}
path = getenv("CCACHE_PATH");
if (!path) {
path = getenv("PATH");
}
if (!path) {
cc_log("no PATH variable!?\n");
return NULL;
}
path = x_strdup(path);
/* search the path looking for the first compiler of the right name
that isn't us */
for (tok=strtok(path,":"); tok; tok = strtok(NULL, ":")) {
char *fname;
x_asprintf(&fname, "%s/%s", tok, name);
/* look for a normal executable file */
if (access(fname, X_OK) == 0 &&
lstat(fname, &st1) == 0 &&
stat(fname, &st2) == 0 &&
S_ISREG(st2.st_mode)) {
/* if its a symlink then ensure it doesn't
point at something called exclude_name */
if (S_ISLNK(st1.st_mode)) {
char *buf = x_realpath(fname);
if (buf) {
char *p = str_basename(buf);
if (strcmp(p, exclude_name) == 0) {
/* its a link to "ccache" ! */
free(p);
free(buf);
continue;
}
free(buf);
free(p);
}
}
/* found it! */
free(path);
return fname;
}
free(fname);
}
return NULL;
}

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/*
Copyright (C) Andrew Tridgell 2002
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
simple front-end functions to mdfour code
*/
#include "ccache.h"
static struct mdfour md;
void hash_buffer(const char *s, int len)
{
mdfour_update(&md, (unsigned char *)s, len);
}
void hash_start(void)
{
mdfour_begin(&md);
}
void hash_string(const char *s)
{
hash_buffer(s, strlen(s));
}
void hash_int(int x)
{
hash_buffer((char *)&x, sizeof(x));
}
/* add contents of a file to the hash */
void hash_file(const char *fname)
{
char buf[1024];
int fd, n;
fd = open(fname, O_RDONLY|O_BINARY);
if (fd == -1) {
cc_log("Failed to open %s\n", fname);
fatal("hash_file");
}
while ((n = read(fd, buf, sizeof(buf))) > 0) {
hash_buffer(buf, n);
}
close(fd);
}
/* return the hash result as a static string */
char *hash_result(void)
{
unsigned char sum[16];
static char ret[53];
int i;
hash_buffer(NULL, 0);
mdfour_result(&md, sum);
for (i=0;i<16;i++) {
sprintf(&ret[i*2], "%02x", (unsigned)sum[i]);
}
sprintf(&ret[i*2], "-%u", (unsigned)md.totalN);
return ret;
}

238
CCache/install-sh Executable file
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#! /bin/sh
#
# install - install a program, script, or datafile
# This comes from X11R5.
#
# Calling this script install-sh is preferred over install.sh, to prevent
# `make' implicit rules from creating a file called install from it
# when there is no Makefile.
#
# This script is compatible with the BSD install script, but was written
# from scratch.
#
# set DOITPROG to echo to test this script
# Don't use :- since 4.3BSD and earlier shells don't like it.
doit="${DOITPROG-}"
# put in absolute paths if you don't have them in your path; or use env. vars.
mvprog="${MVPROG-mv}"
cpprog="${CPPROG-cp}"
chmodprog="${CHMODPROG-chmod}"
chownprog="${CHOWNPROG-chown}"
chgrpprog="${CHGRPPROG-chgrp}"
stripprog="${STRIPPROG-strip}"
rmprog="${RMPROG-rm}"
mkdirprog="${MKDIRPROG-mkdir}"
transformbasename=""
transform_arg=""
instcmd="$mvprog"
chmodcmd="$chmodprog 0755"
chowncmd=""
chgrpcmd=""
stripcmd=""
rmcmd="$rmprog -f"
mvcmd="$mvprog"
src=""
dst=""
dir_arg=""
while [ x"$1" != x ]; do
case $1 in
-c) instcmd="$cpprog"
shift
continue;;
-d) dir_arg=true
shift
continue;;
-m) chmodcmd="$chmodprog $2"
shift
shift
continue;;
-o) chowncmd="$chownprog $2"
shift
shift
continue;;
-g) chgrpcmd="$chgrpprog $2"
shift
shift
continue;;
-s) stripcmd="$stripprog"
shift
continue;;
-t=*) transformarg=`echo $1 | sed 's/-t=//'`
shift
continue;;
-b=*) transformbasename=`echo $1 | sed 's/-b=//'`
shift
continue;;
*) if [ x"$src" = x ]
then
src=$1
else
# this colon is to work around a 386BSD /bin/sh bug
:
dst=$1
fi
shift
continue;;
esac
done
if [ x"$src" = x ]
then
echo "install: no input file specified"
exit 1
else
true
fi
if [ x"$dir_arg" != x ]; then
dst=$src
src=""
if [ -d $dst ]; then
instcmd=:
else
instcmd=mkdir
fi
else
# Waiting for this to be detected by the "$instcmd $src $dsttmp" command
# might cause directories to be created, which would be especially bad
# if $src (and thus $dsttmp) contains '*'.
if [ -f $src -o -d $src ]
then
true
else
echo "install: $src does not exist"
exit 1
fi
if [ x"$dst" = x ]
then
echo "install: no destination specified"
exit 1
else
true
fi
# If destination is a directory, append the input filename; if your system
# does not like double slashes in filenames, you may need to add some logic
if [ -d $dst ]
then
dst="$dst"/`basename $src`
else
true
fi
fi
## this sed command emulates the dirname command
dstdir=`echo $dst | sed -e 's,[^/]*$,,;s,/$,,;s,^$,.,'`
# Make sure that the destination directory exists.
# this part is taken from Noah Friedman's mkinstalldirs script
# Skip lots of stat calls in the usual case.
if [ ! -d "$dstdir" ]; then
defaultIFS='
'
IFS="${IFS-${defaultIFS}}"
oIFS="${IFS}"
# Some sh's can't handle IFS=/ for some reason.
IFS='%'
set - `echo ${dstdir} | sed -e 's@/@%@g' -e 's@^%@/@'`
IFS="${oIFS}"
pathcomp=''
while [ $# -ne 0 ] ; do
pathcomp="${pathcomp}${1}"
shift
if [ ! -d "${pathcomp}" ] ;
then
$mkdirprog "${pathcomp}"
else
true
fi
pathcomp="${pathcomp}/"
done
fi
if [ x"$dir_arg" != x ]
then
$doit $instcmd $dst &&
if [ x"$chowncmd" != x ]; then $doit $chowncmd $dst; else true ; fi &&
if [ x"$chgrpcmd" != x ]; then $doit $chgrpcmd $dst; else true ; fi &&
if [ x"$stripcmd" != x ]; then $doit $stripcmd $dst; else true ; fi &&
if [ x"$chmodcmd" != x ]; then $doit $chmodcmd $dst; else true ; fi
else
# If we're going to rename the final executable, determine the name now.
if [ x"$transformarg" = x ]
then
dstfile=`basename $dst`
else
dstfile=`basename $dst $transformbasename |
sed $transformarg`$transformbasename
fi
# don't allow the sed command to completely eliminate the filename
if [ x"$dstfile" = x ]
then
dstfile=`basename $dst`
else
true
fi
# Make a temp file name in the proper directory.
dsttmp=$dstdir/#inst.$$#
# Move or copy the file name to the temp name
$doit $instcmd $src $dsttmp &&
trap "rm -f ${dsttmp}" 0 &&
# and set any options; do chmod last to preserve setuid bits
# If any of these fail, we abort the whole thing. If we want to
# ignore errors from any of these, just make sure not to ignore
# errors from the above "$doit $instcmd $src $dsttmp" command.
if [ x"$chowncmd" != x ]; then $doit $chowncmd $dsttmp; else true;fi &&
if [ x"$chgrpcmd" != x ]; then $doit $chgrpcmd $dsttmp; else true;fi &&
if [ x"$stripcmd" != x ]; then $doit $stripcmd $dsttmp; else true;fi &&
if [ x"$chmodcmd" != x ]; then $doit $chmodcmd $dsttmp; else true;fi &&
# Now rename the file to the real destination.
$doit $rmcmd -f $dstdir/$dstfile &&
$doit $mvcmd $dsttmp $dstdir/$dstfile
fi &&
exit 0

284
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/*
a implementation of MD4 designed for use in the SMB authentication protocol
Copyright (C) Andrew Tridgell 1997-1998.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "ccache.h"
/* NOTE: This code makes no attempt to be fast!
It assumes that a int is at least 32 bits long
*/
static struct mdfour *m;
#define MASK32 (0xffffffff)
#define F(X,Y,Z) ((((X)&(Y)) | ((~(X))&(Z))))
#define G(X,Y,Z) ((((X)&(Y)) | ((X)&(Z)) | ((Y)&(Z))))
#define H(X,Y,Z) (((X)^(Y)^(Z)))
#define lshift(x,s) (((((x)<<(s))&MASK32) | (((x)>>(32-(s)))&MASK32)))
#define ROUND1(a,b,c,d,k,s) a = lshift((a + F(b,c,d) + M[k])&MASK32, s)
#define ROUND2(a,b,c,d,k,s) a = lshift((a + G(b,c,d) + M[k] + 0x5A827999)&MASK32,s)
#define ROUND3(a,b,c,d,k,s) a = lshift((a + H(b,c,d) + M[k] + 0x6ED9EBA1)&MASK32,s)
/* this applies md4 to 64 byte chunks */
static void mdfour64(uint32 *M)
{
uint32 AA, BB, CC, DD;
uint32 A,B,C,D;
A = m->A; B = m->B; C = m->C; D = m->D;
AA = A; BB = B; CC = C; DD = D;
ROUND1(A,B,C,D, 0, 3); ROUND1(D,A,B,C, 1, 7);
ROUND1(C,D,A,B, 2, 11); ROUND1(B,C,D,A, 3, 19);
ROUND1(A,B,C,D, 4, 3); ROUND1(D,A,B,C, 5, 7);
ROUND1(C,D,A,B, 6, 11); ROUND1(B,C,D,A, 7, 19);
ROUND1(A,B,C,D, 8, 3); ROUND1(D,A,B,C, 9, 7);
ROUND1(C,D,A,B, 10, 11); ROUND1(B,C,D,A, 11, 19);
ROUND1(A,B,C,D, 12, 3); ROUND1(D,A,B,C, 13, 7);
ROUND1(C,D,A,B, 14, 11); ROUND1(B,C,D,A, 15, 19);
ROUND2(A,B,C,D, 0, 3); ROUND2(D,A,B,C, 4, 5);
ROUND2(C,D,A,B, 8, 9); ROUND2(B,C,D,A, 12, 13);
ROUND2(A,B,C,D, 1, 3); ROUND2(D,A,B,C, 5, 5);
ROUND2(C,D,A,B, 9, 9); ROUND2(B,C,D,A, 13, 13);
ROUND2(A,B,C,D, 2, 3); ROUND2(D,A,B,C, 6, 5);
ROUND2(C,D,A,B, 10, 9); ROUND2(B,C,D,A, 14, 13);
ROUND2(A,B,C,D, 3, 3); ROUND2(D,A,B,C, 7, 5);
ROUND2(C,D,A,B, 11, 9); ROUND2(B,C,D,A, 15, 13);
ROUND3(A,B,C,D, 0, 3); ROUND3(D,A,B,C, 8, 9);
ROUND3(C,D,A,B, 4, 11); ROUND3(B,C,D,A, 12, 15);
ROUND3(A,B,C,D, 2, 3); ROUND3(D,A,B,C, 10, 9);
ROUND3(C,D,A,B, 6, 11); ROUND3(B,C,D,A, 14, 15);
ROUND3(A,B,C,D, 1, 3); ROUND3(D,A,B,C, 9, 9);
ROUND3(C,D,A,B, 5, 11); ROUND3(B,C,D,A, 13, 15);
ROUND3(A,B,C,D, 3, 3); ROUND3(D,A,B,C, 11, 9);
ROUND3(C,D,A,B, 7, 11); ROUND3(B,C,D,A, 15, 15);
A += AA; B += BB;
C += CC; D += DD;
A &= MASK32; B &= MASK32;
C &= MASK32; D &= MASK32;
m->A = A; m->B = B; m->C = C; m->D = D;
}
static void copy64(uint32 *M, const unsigned char *in)
{
int i;
for (i=0;i<16;i++)
M[i] = (in[i*4+3]<<24) | (in[i*4+2]<<16) |
(in[i*4+1]<<8) | (in[i*4+0]<<0);
}
static void copy4(unsigned char *out,uint32 x)
{
out[0] = x&0xFF;
out[1] = (x>>8)&0xFF;
out[2] = (x>>16)&0xFF;
out[3] = (x>>24)&0xFF;
}
void mdfour_begin(struct mdfour *md)
{
md->A = 0x67452301;
md->B = 0xefcdab89;
md->C = 0x98badcfe;
md->D = 0x10325476;
md->totalN = 0;
md->tail_len = 0;
}
static void mdfour_tail(const unsigned char *in, int n)
{
unsigned char buf[128];
uint32 M[16];
uint32 b;
m->totalN += n;
b = m->totalN * 8;
memset(buf, 0, 128);
if (n) memcpy(buf, in, n);
buf[n] = 0x80;
if (n <= 55) {
copy4(buf+56, b);
copy64(M, buf);
mdfour64(M);
} else {
copy4(buf+120, b);
copy64(M, buf);
mdfour64(M);
copy64(M, buf+64);
mdfour64(M);
}
}
void mdfour_update(struct mdfour *md, const unsigned char *in, int n)
{
uint32 M[16];
m = md;
if (in == NULL) {
mdfour_tail(md->tail, md->tail_len);
return;
}
if (md->tail_len) {
int len = 64 - md->tail_len;
if (len > n) len = n;
memcpy(md->tail+md->tail_len, in, len);
md->tail_len += len;
n -= len;
in += len;
if (md->tail_len == 64) {
copy64(M, md->tail);
mdfour64(M);
m->totalN += 64;
md->tail_len = 0;
}
}
while (n >= 64) {
copy64(M, in);
mdfour64(M);
in += 64;
n -= 64;
m->totalN += 64;
}
if (n) {
memcpy(md->tail, in, n);
md->tail_len = n;
}
}
void mdfour_result(struct mdfour *md, unsigned char *out)
{
m = md;
copy4(out, m->A);
copy4(out+4, m->B);
copy4(out+8, m->C);
copy4(out+12, m->D);
}
void mdfour(unsigned char *out, const unsigned char *in, int n)
{
struct mdfour md;
mdfour_begin(&md);
mdfour_update(&md, in, n);
mdfour_update(&md, NULL, 0);
mdfour_result(&md, out);
}
#ifdef TEST_MDFOUR
static void file_checksum1(char *fname)
{
int fd, i;
struct mdfour md;
unsigned char buf[1024], sum[16];
unsigned chunk;
fd = open(fname,O_RDONLY|O_BINARY);
if (fd == -1) {
perror("fname");
exit(1);
}
chunk = 1 + random() % (sizeof(buf) - 1);
mdfour_begin(&md);
while (1) {
int n = read(fd, buf, chunk);
if (n >= 0) {
mdfour_update(&md, buf, n);
}
if (n < chunk) break;
}
close(fd);
mdfour_update(&md, NULL, 0);
mdfour_result(&md, sum);
for (i=0;i<16;i++)
printf("%02x", sum[i]);
printf("\n");
}
#if 0
#include "../md4.h"
static void file_checksum2(char *fname)
{
int fd, i;
MDstruct md;
unsigned char buf[64], sum[16];
fd = open(fname,O_RDONLY|O_BINARY);
if (fd == -1) {
perror("fname");
exit(1);
}
MDbegin(&md);
while (1) {
int n = read(fd, buf, sizeof(buf));
if (n <= 0) break;
MDupdate(&md, buf, n*8);
}
if (!md.done) {
MDupdate(&md, buf, 0);
}
close(fd);
memcpy(sum, md.buffer, 16);
for (i=0;i<16;i++)
printf("%02x", sum[i]);
printf("\n");
}
#endif
int main(int argc, char *argv[])
{
file_checksum1(argv[1]);
#if 0
file_checksum2(argv[1]);
#endif
return 0;
}
#endif

36
CCache/mdfour.h Normal file
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/*
Unix SMB/Netbios implementation.
Version 1.9.
a implementation of MD4 designed for use in the SMB authentication protocol
Copyright (C) Andrew Tridgell 1997-1998.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
struct mdfour {
uint32 A, B, C, D;
uint32 totalN;
unsigned char tail[64];
unsigned tail_len;
};
void mdfour_begin(struct mdfour *md);
void mdfour_update(struct mdfour *md, const unsigned char *in, int n);
void mdfour_result(struct mdfour *md, unsigned char *out);
void mdfour(unsigned char *out, const unsigned char *in, int n);

5
CCache/packaging/README Normal file
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@ -0,0 +1,5 @@
These packaging files are contributd by users of ccache. I do not
maintain them, and they may well need updating before you use them.
I don't distribute binary packages of ccache myself, but if you wish
to add ccache to a distribution then that's OK

37
CCache/packaging/ccache.spec Normal file
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@ -0,0 +1,37 @@
Summary: Compiler Cache
Name: ccache
Version: 2.3
Release: 1
Group: Development/Languages
License: GPL
URL: http://ccache.samba.org/
Source: ccache-%{version}.tar.gz
BuildRoot: %{_tmppath}/%{name}-%{version}-root
%description
ccache caches gcc output files
%prep
%setup -q
%build
%configure
make
install -d -m 0755 $RPM_BUILD_ROOT%{_bindir}
install -m 0755 ccache $RPM_BUILD_ROOT%{_bindir}
install -d -m 0755 $RPM_BUILD_ROOT%{_mandir}/man1
install -m 0644 ccache.1 $RPM_BUILD_ROOT%{_mandir}/man1
%files
%defattr(-,root,root)
%doc README
%{_mandir}/man1/ccache.1*
%{_bindir}/ccache
%clean
[ "$RPM_BUILD_ROOT" != "/" ] && rm -rf $RPM_BUILD_ROOT
%changelog
* Mon Apr 01 2002 Peter Jones <pjones@redhat.com>
- Created the package

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