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c++11
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,133 @@ | ||
| # ============================================================================ | ||
| # http://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx_11.html | ||
| # ============================================================================ | ||
| # | ||
| # SYNOPSIS | ||
| # | ||
| # AX_CXX_COMPILE_STDCXX_11([ext|noext],[mandatory|optional]) | ||
| # | ||
| # DESCRIPTION | ||
| # | ||
| # Check for baseline language coverage in the compiler for the C++11 | ||
| # standard; if necessary, add switches to CXXFLAGS to enable support. | ||
| # | ||
| # 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. | ||
| # | ||
| # The second argument, if specified 'mandatory' or if left unspecified, | ||
| # indicates that baseline C++11 support is required and that the macro | ||
| # should error out if no mode with that support is found. If specified | ||
| # 'optional', then configuration proceeds regardless, after defining | ||
| # HAVE_CXX11 if and only if a supporting mode is found. | ||
| # | ||
| # LICENSE | ||
| # | ||
| # Copyright (c) 2008 Benjamin Kosnik <[email protected]> | ||
| # Copyright (c) 2012 Zack Weinberg <[email protected]> | ||
| # Copyright (c) 2013 Roy Stogner <[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. This file is offered as-is, without any | ||
| # warranty. | ||
|
|
||
| #serial 3 | ||
|
|
||
| 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_DEFUN([AX_CXX_COMPILE_STDCXX_11], [dnl | ||
| m4_if([$1], [], [], | ||
| [$1], [ext], [], | ||
| [$1], [noext], [], | ||
| [m4_fatal([invalid argument `$1' to AX_CXX_COMPILE_STDCXX_11])])dnl | ||
| m4_if([$2], [], [ax_cxx_compile_cxx11_required=true], | ||
| [$2], [mandatory], [ax_cxx_compile_cxx11_required=true], | ||
| [$2], [optional], [ax_cxx_compile_cxx11_required=false], | ||
| [m4_fatal([invalid second argument `$2' to AX_CXX_COMPILE_STDCXX_11])])dnl | ||
| AC_LANG_PUSH([C++])dnl | ||
| ac_success=no | ||
| AC_CACHE_CHECK(whether $CXX supports C++11 features by default, | ||
| ax_cv_cxx_compile_cxx11, | ||
| [AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_11_testbody])], | ||
| [ax_cv_cxx_compile_cxx11=yes], | ||
| [ax_cv_cxx_compile_cxx11=no])]) | ||
| if test x$ax_cv_cxx_compile_cxx11 = xyes; then | ||
| ac_success=yes | ||
| fi | ||
| 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 | ||
| 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 $switch" | ||
| ac_success=yes | ||
| break | ||
| fi | ||
| done | ||
| fi]) | ||
| AC_LANG_POP([C++]) | ||
| if test x$ax_cxx_compile_cxx11_required = xtrue; then | ||
| if test x$ac_success = xno; then | ||
| AC_MSG_ERROR([*** A compiler with support for C++11 language features is required.]) | ||
| fi | ||
| else | ||
| if test x$ac_success = xno; then | ||
| HAVE_CXX11=0 | ||
| AC_MSG_NOTICE([No compiler with C++11 support was found]) | ||
| else | ||
| HAVE_CXX11=1 | ||
| AC_DEFINE(HAVE_CXX11,1, | ||
| [define if the compiler supports basic C++11 syntax]) | ||
| fi | ||
| AC_SUBST(HAVE_CXX11) | ||
| fi | ||
| ]) |
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