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default features: make musl usable without feature test macros

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the old behavior of exposing nothing except plain ISO C can be
obtained by defining __STRICT_ANSI__ or using a compiler option (such
as -std=c99) that predefines it. the new default featureset is POSIX
with XSI plus _BSD_SOURCE. any explicit feature test macros will
inhibit the default.

installation docs have also been updated to reflect this change.
This commit is contained in:
Rich Felker 2012-09-07 23:13:55 -04:00
commit c1a9658bd1
48 changed files with 102 additions and 129 deletions
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15
INSTALL
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@ -76,14 +76,9 @@ musl-gcc hello.c
./a.out
To configure autoconf-based program to compile and link against musl,
you may wish to use:
set the CC variable to musl-gcc when running configure, as in:
CC="musl-gcc -D_GNU_SOURCE" ./configure ...
Correctly-written build systems should not need -D_GNU_SOURCE as part
of $CC, but many programs do not use feature-test macros correctly and
simply assume the compiler will automatically give them the kitchen
sink, so the above command is an easy workaround.
CC=musl-gcc ./configure ...
You will probably also want to use --prefix when building libraries to
ensure that they are installed under the musl prefix and not in the
@ -140,9 +135,3 @@ dynamic linker (program interpreter) is /lib/ld-musl-$ARCH.so.1. If
you're using static linking only, you might instead check the symbols
and look for anything suspicious that would indicate your old glibc or
uClibc was used.
When building programs against musl, you may still want to ensure the
appropriate feature test macros get defined, as in:
CC="gcc -D_GNU_SOURCE" ./configure ...