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Make AX_CXX_COMPILE_STDCXX_11 test for -stdlib=libc++ via std::shared_ptr

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The clang shipped with OSX XCode and clangs not build enabling libcpp,
will default to the libstdc++ headers and lib installed on the system.
In the OSX case, that libstdc++ is the one bundles with gcc-4.2, which
is far too old to provide all required C++11 types, such as
std::shared_ptr.
Hence, the C++11 check should try to compile a program with a C++11 type
and try -stdlib=libc++ if the default lib fails to compile said program.
This commit is contained in:
Nils Maier 2013-08-21 22:59:34 +02:00
parent b888088dc3
commit 22e414dbb0
1 changed files with 43 additions and 28 deletions
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71
m4/ax_cxx_compile_stdcxx_11.m4
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@ -22,11 +22,16 @@
# 'optional', then configuration proceeds regardless, after defining
# HAVE_CXX11 if and only if a supporting mode is found.
#
# This version of AX_CXX_COMPILE_STDCXX_11 will also check if specifying
# `-stdlib=libc++`` is required, as it is on current OSX systems using
# a clang which defaults to an old libstdc++.
#
# LICENSE
#
# Copyright (c) 2008 Benjamin Kosnik <bkoz@redhat.com>
# Copyright (c) 2012 Zack Weinberg <zackw@panix.com>
# Copyright (c) 2013 Roy Stogner <roystgnr@ices.utexas.edu>
# Copyright (c) 2013 Nils Maier <maierman@web.de>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
@ -34,8 +39,11 @@
# warranty.
#serial 3
#modified to check fo -stdlib=libc++ (required on OSX)
m4_define([_AX_CXX_COMPILE_STDCXX_11_testbody], [
#include <memory>
template <typename T>
struct check
{
@ -52,6 +60,9 @@ m4_define([_AX_CXX_COMPILE_STDCXX_11_testbody], [
check_type&& cr = static_cast<check_type&&>(c);
auto d = a;
// Check std::shared_ptr is available, which might require -stdlib=libc++.
std::shared_ptr<check_type> ptr;
])
AC_DEFUN([AX_CXX_COMPILE_STDCXX_11], [dnl
@ -77,40 +88,44 @@ AC_DEFUN([AX_CXX_COMPILE_STDCXX_11], [dnl
m4_if([$1], [noext], [], [dnl
if test x$ac_success = xno; then
for switch in -std=gnu++11 -std=gnu++0x; do
cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx11_$switch])
AC_CACHE_CHECK(whether $CXX supports C++11 features with $switch,
$cachevar,
[ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS $switch"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_11_testbody])],
[eval $cachevar=yes],
[eval $cachevar=no])
CXXFLAGS="$ac_save_CXXFLAGS"])
if eval test x\$$cachevar = xyes; then
CXXFLAGS="$CXXFLAGS $switch"
ac_success=yes
break
fi
for lib in "" -stdlib=libc++; do
cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx11_$switch$lib])
AC_CACHE_CHECK(whether $CXX supports C++11 features with $switch $lib,
$cachevar,
[ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS $switch $lib"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_11_testbody])],
[eval $cachevar=yes],
[eval $cachevar=no])
CXXFLAGS="$ac_save_CXXFLAGS"])
if eval test x\$$cachevar = xyes; then
CXXFLAGS="$CXXFLAGS $switch $lib"
ac_success=yes
break 2
fi
done
done
fi])
m4_if([$1], [ext], [], [dnl
if test x$ac_success = xno; then
for switch in -std=c++11 -std=c++0x; do
cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx11_$switch])
AC_CACHE_CHECK(whether $CXX supports C++11 features with $switch,
$cachevar,
[ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS $switch"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_11_testbody])],
[eval $cachevar=yes],
[eval $cachevar=no])
CXXFLAGS="$ac_save_CXXFLAGS"])
if eval test x\$$cachevar = xyes; then
CXXFLAGS="$CXXFLAGS $switch"
ac_success=yes
break
fi
for lib in "" -stdlib=libc++; do
cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx11_$switch$lib])
AC_CACHE_CHECK(whether $CXX supports C++11 features with $switch $lib,
$cachevar,
[ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS $switch $lib"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_11_testbody])],
[eval $cachevar=yes],
[eval $cachevar=no])
CXXFLAGS="$ac_save_CXXFLAGS"])
if eval test x\$$cachevar = xyes; then
CXXFLAGS="$CXXFLAGS $switch $lib"
ac_success=yes
break 2
fi
done
done
fi])
AC_LANG_POP([C++])