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* configure.ac: Turn on C++11 flags.

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This commit is contained in:
Alexandre Duret-Lutz 2013-12-15 22:30:23 +01:00
parent 2c05a9fdb6
commit f3874e05cc
1 changed files with 47 additions and 0 deletions
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47
configure.ac
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@ -71,6 +71,53 @@ AX_CHECK_COMPILE_FLAG([-Werror -fvisibility=hidden],
[CXXFLAGS="$CXXFLAGS -fvisibility-inlines-hidden"])])
CXXFLAGS="$CXXFLAGS -DSPOT_BUILD"
# Turn on C++11 support
AX_CHECK_COMPILE_FLAG([-std=c++11 -stdlib=libc++],
[CXXFLAGS="$CXXFLAGS -std=c++11 -stdlib=libc++"
stdpass=true])
if ! "${stdpass-false}"; then
AX_CHECK_COMPILE_FLAG([-std=c++11],
[CXXFLAGS="$CXXFLAGS -std=c++11"
stdpass=true])
fi
if ! "${stdpass-false}"; then
AX_CHECK_COMPILE_FLAG([-std=c++0x],
[CXXFLAGS="$CXXFLAGS -std=c++0x"
stdpass=true])
fi
if ! "${stdpass-false}"; then
AC_ERROR([unable to turn on C++11 mode with this compiler])
fi
m4_define([_AX_CXX_COMPILE_STDCXX_11_testbody], [
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 = static_cast<check_type&&>(c);
auto d = a;
])
AC_CACHE_CHECK([whether $CXX $CXXFLAGS supports C++11 features],
[ax_cv_cxx_compile_cxx11],
[AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_11_testbody])],
[ax_cv_cxx_compile_cxx11=yes],
[ax_cv_cxx_compile_cxx11=no])])
test "x$ax_cv_cxx_compile_cxx11" = xyes ||
AC_ERROR([unable to compile C++11 with this compiler])
AC_HEADER_UNORDERED_MAP
AC_HEADER_TR1_UNORDERED_MAP
AC_HEADER_EXT_HASH_MAP