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acinclude.m4
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acinclude.m4
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#Source of this macro is http://autoconf-archive.cryp.to/ac_cxx_compile_stdcxx_0x.html
#Synopsis
#AC_CXX_COMPILE_STDCXX_0X
#
#Description
#Check for baseline language coverage in the compiler for the C++0x standard.
#
#Author
#Benjamin Kosnik <[email protected]>
#
#Last Modified
#2008-04-17
#
#License
#
#Copyright © 2008 Benjamin Kosnik <[email protected]>
#
#Copying and distribution of this file, with or without modification,
#are permitted in any medium without royalty provided the copyright notice
#and this notice are preserved.
AC_DEFUN([AC_CXX_COMPILE_STDCXX_0X], [
AC_CACHE_CHECK(if g++ supports C++0x features without additional flags,
ac_cv_cxx_compile_cxx0x_native,
[AC_LANG_SAVE
AC_LANG_CPLUSPLUS
AC_TRY_COMPILE([
template <typename T>
struct check
{
static_assert(sizeof(int) <= sizeof(T), "not big enough");
};
typedef check<check<bool>> right_angle_brackets;
int a;
decltype(a) b;
typedef check<int> check_type;
check_type c;
check_type&& cr = c;],,
ac_cv_cxx_compile_cxx0x_native=yes, ac_cv_cxx_compile_cxx0x_native=no)
AC_LANG_RESTORE
])
AC_CACHE_CHECK(if g++ supports C++0x features with -std=c++0x,
ac_cv_cxx_compile_cxx0x_cxx,
[AC_LANG_SAVE
AC_LANG_CPLUSPLUS
ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -std=c++0x"
AC_TRY_COMPILE([
template <typename T>
struct check
{
static_assert(sizeof(int) <= sizeof(T), "not big enough");
};
typedef check<check<bool>> right_angle_brackets;
int a;
decltype(a) b;
typedef check<int> check_type;
check_type c;
check_type&& cr = c;],,
ac_cv_cxx_compile_cxx0x_cxx=yes, ac_cv_cxx_compile_cxx0x_cxx=no)
CXXFLAGS="$ac_save_CXXFLAGS"
AC_LANG_RESTORE
])
AC_CACHE_CHECK(if g++ supports C++0x features with -std=gnu++0x,
ac_cv_cxx_compile_cxx0x_gxx,
[AC_LANG_SAVE
AC_LANG_CPLUSPLUS
ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -std=gnu++0x"
AC_TRY_COMPILE([
template <typename T>
struct check
{
static_assert(sizeof(int) <= sizeof(T), "not big enough");
};
typedef check<check<bool>> right_angle_brackets;
int a;
decltype(a) b;
typedef check<int> check_type;
check_type c;
check_type&& cr = c;],,
ac_cv_cxx_compile_cxx0x_gxx=yes, ac_cv_cxx_compile_cxx0x_gxx=no)
CXXFLAGS="$ac_save_CXXFLAGS"
AC_LANG_RESTORE
])
if test "$ac_cv_cxx_compile_cxx0x_native" = yes ||
test "$ac_cv_cxx_compile_cxx0x_cxx" = yes ||
test "$ac_cv_cxx_compile_cxx0x_gxx" = yes; then
AC_DEFINE(HAVE_STDCXX_0X,,[Define if g++ supports C++0x features. ])
AM_CONDITIONAL(HAVE_STDCXX_0X, true)
else
AM_CONDITIONAL(HAVE_STDCXX_0X, false)
fi
if test "$ac_cv_cxx_compile_cxx0x_native" != yes; then
CXX0X_CFLAGS=""
GNUXX0X_CFLAGS=""
if test "$ac_cv_cxx_compile_cxx0x_cxx" = yes; then
CXX0X_CFLAGS="-std=c++0x"
fi
if test "$ac_cv_cxx_compile_cxx0x_gxx" = yes; then
GNUXX0X_CFLAGS="-std=gnu++0x"
fi
fi
])