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c++11: improve configure.

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* configure.ac, m4/ax_check_compile_flag.m4: Update from
Vaucanson 2.  (Thank you Akim.)
This commit is contained in:
Alexandre Duret-Lutz 2013-12-17 18:17:22 +01:00
parent ea6a34b0b4
commit 3a406dc3d7
2 changed files with 18 additions and 32 deletions
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44
configure.ac
View file

@ -72,26 +72,11 @@ AX_CHECK_COMPILE_FLAG([-Werror -fvisibility=hidden],
CXXFLAGS="$CXXFLAGS -DSPOT_BUILD" CXXFLAGS="$CXXFLAGS -DSPOT_BUILD"
# Turn on C++11 support # Turn on C++11 support
AX_CHECK_COMPILE_FLAG([-std=c++11 -stdlib=libc++], m4_define([_AX_CXX_COMPILE_STDCXX_11_testbody],
[CXXFLAGS="$CXXFLAGS -std=c++11 -stdlib=libc++" [AC_LANG_SOURCE([#include <memory>
stdpass=true]) #include <string>
if ! "${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 template <typename T>
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 struct check
{ {
static_assert(sizeof(int) <= sizeof(T), "not big enough"); static_assert(sizeof(int) <= sizeof(T), "not big enough");
@ -99,6 +84,8 @@ m4_define([_AX_CXX_COMPILE_STDCXX_11_testbody], [
typedef check<check<bool>> right_angle_brackets; typedef check<check<bool>> right_angle_brackets;
auto f = std::make_shared<std::string>("shared_ptr");
int a; int a;
decltype(a) b; decltype(a) b;
@ -107,16 +94,17 @@ m4_define([_AX_CXX_COMPILE_STDCXX_11_testbody], [
check_type&& cr = static_cast<check_type&&>(c); check_type&& cr = static_cast<check_type&&>(c);
auto d = a; auto d = a;
]) ])])
AC_CACHE_CHECK([whether $CXX $CXXFLAGS supports C++11 features], for f in -std=c++11 '-std=c++11 -stdlib=libc++' -std=c++0x
[ax_cv_cxx_compile_cxx11], do
[AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_11_testbody])], AX_CHECK_COMPILE_FLAG([$f], [CXXFLAGS="$CXXFLAGS $f" stdpass=true], [], [],
[ax_cv_cxx_compile_cxx11=yes], [_AX_CXX_COMPILE_STDCXX_11_testbody])
[ax_cv_cxx_compile_cxx11=no])]) ${stdpass-false} && break
done
test "x$ax_cv_cxx_compile_cxx11" = xyes || if ! "${stdpass-false}"; then
AC_ERROR([unable to compile C++11 with this compiler]) AC_ERROR([unable to turn on C++11 mode with this compiler])
fi
AX_CHECK_BUDDY AX_CHECK_BUDDY
AX_CHECK_GSPNLIB AX_CHECK_GSPNLIB

6
m4/ax_check_compile_flag.m4
View file

@ -61,12 +61,10 @@ AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [ AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
_AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1" _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM()], AC_COMPILE_IFELSE([m4_default([$5], [AC_LANG_PROGRAM()])],
[AS_VAR_SET(CACHEVAR,[yes])], [AS_VAR_SET(CACHEVAR,[yes])],
[AS_VAR_SET(CACHEVAR,[no])]) [AS_VAR_SET(CACHEVAR,[no])])
_AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags]) _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
AS_IF([test x"AS_VAR_GET(CACHEVAR)" = xyes], AS_IF([test x"AS_VAR_GET(CACHEVAR)" = xyes], [$2], [$3])
[m4_default([$2], :)],
[m4_default([$3], :)])
AS_VAR_POPDEF([CACHEVAR])dnl AS_VAR_POPDEF([CACHEVAR])dnl
])dnl AX_CHECK_COMPILE_FLAGS ])dnl AX_CHECK_COMPILE_FLAGS