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Modify autoconf macro to be more flexible about how it is used - sets CXX11FLAGS, HAVE_CXX11_COMPILER and option to not error out

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git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/branches/gsoc2009-matevz@13866 626c5289-ae23-0410-ae9c-e8d60b6d4f22
This commit is contained in:
William S Fulton 2012-10-07 18:50:41 +00:00
commit 77ccb6f21c
1 changed files with 19 additions and 5 deletions
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24
Tools/config/ax_cxx_compile_stdcxx_11.m4
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@ -4,15 +4,18 @@
#
# SYNOPSIS
#
# AX_CXX_COMPILE_STDCXX_11([ext|noext])
# AX_CXX_COMPILE_STDCXX_11([ext|noext], [nostop])
#
# DESCRIPTION
#
# Check for baseline language coverage in the compiler for the C++11
# standard; if necessary, add switches to CXXFLAGS to enable support.
# Errors out if no mode that supports C++11 baseline syntax can be found.
# The argument, if specified, indicates whether you insist on an extended
# mode (e.g. -std=gnu++11) or a strict conformance mode (e.g. -std=c++11).
# CXX11FLAGS will also contain any necessary switches to enable support.
# HAVE_CXX11_COMPILER will additionally be set to yes if there is support.
# If the second argument is not specified, errors out if no mode that
# supports C++11 baseline syntax can be found. The first argument, if
# specified, indicates whether you insist on an extended mode
# (e.g. -std=gnu++11) or a strict conformance mode (e.g. -std=c++11).
# If neither is specified, you get whatever works, with preference for an
# extended mode.
#
@ -20,6 +23,7 @@
#
# Copyright (c) 2008 Benjamin Kosnik <bkoz@redhat.com>
# Copyright (c) 2012 Zack Weinberg <zackw@panix.com>
# Copyright (c) 2012 William Fulton <wsf@fultondesigns.co.uk>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
@ -50,8 +54,12 @@ AC_DEFUN([AX_CXX_COMPILE_STDCXX_11], [dnl
[$1], [ext], [],
[$1], [noext], [],
[m4_fatal([invalid argument `$1' to AX_CXX_COMPILE_STDCXX_11])])dnl
m4_if([$2], [], [],
[$2], [nostop], [],
[m4_fatal([invalid argument `$2' to AX_CXX_COMPILE_STDCXX_11])])dnl
AC_LANG_ASSERT([C++])dnl
ac_success=no
CXX11FLAGS=
AC_CACHE_CHECK(whether $CXX supports C++11 features by default,
ax_cv_cxx_compile_cxx11,
[AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_11_testbody])],
@ -75,6 +83,7 @@ AC_DEFUN([AX_CXX_COMPILE_STDCXX_11], [dnl
CXXFLAGS="$ac_save_CXXFLAGS"])
if eval test x\$$cachevar = xyes; then
CXXFLAGS="$CXXFLAGS $switch"
CXX11FLAGS=$switch
ac_success=yes
break
fi
@ -95,6 +104,7 @@ AC_DEFUN([AX_CXX_COMPILE_STDCXX_11], [dnl
CXXFLAGS="$ac_save_CXXFLAGS"])
if eval test x\$$cachevar = xyes; then
CXXFLAGS="$CXXFLAGS $switch"
CXX11FLAGS=$switch
ac_success=yes
break
fi
@ -102,6 +112,10 @@ AC_DEFUN([AX_CXX_COMPILE_STDCXX_11], [dnl
fi])
if test x$ac_success = xno; then
AC_MSG_ERROR([*** A compiler with support for C++11 language features is required.])
if test x$2 != xnostop; then
AC_MSG_ERROR([*** A compiler with support for C++11 language features is required.])
fi
else
HAVE_CXX11_COMPILER=yes
fi
])