diff options
Diffstat (limited to 'aclocal/ax_cxx_compile_stdcxx_11.m4')
| -rw-r--r-- | aclocal/ax_cxx_compile_stdcxx_11.m4 | 160 |
1 files changed, 17 insertions, 143 deletions
diff --git a/aclocal/ax_cxx_compile_stdcxx_11.m4 b/aclocal/ax_cxx_compile_stdcxx_11.m4 index a9a8f584f..1733fd85f 100644 --- a/aclocal/ax_cxx_compile_stdcxx_11.m4 +++ b/aclocal/ax_cxx_compile_stdcxx_11.m4 @@ -1,26 +1,23 @@ -# ============================================================================ -# http://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx_11.html -# ============================================================================ +# ============================================================================= +# https://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx_11.html +# ============================================================================= # # SYNOPSIS # -# AX_CXX_COMPILE_STDCXX_11([ext|noext],[mandatory|optional]) +# 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. +# standard; if necessary, add switches to CXX and CXXCPP 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. +# This macro is a convenience alias for calling the AX_CXX_COMPILE_STDCXX +# macro with the version set to C++11. The two optional arguments are +# forwarded literally as the second and third argument respectively. +# Please see the documentation for the AX_CXX_COMPILE_STDCXX macro for +# more information. If you want to use this macro, you also need to +# download the ax_cxx_compile_stdcxx.m4 file. # # LICENSE # @@ -28,138 +25,15 @@ # Copyright (c) 2012 Zack Weinberg <zackw@panix.com> # Copyright (c) 2013 Roy Stogner <roystgnr@ices.utexas.edu> # Copyright (c) 2014, 2015 Google Inc.; contributed by Alexey Sokolov <sokolov@google.com> +# Copyright (c) 2015 Paul Norman <penorman@mac.com> +# Copyright (c) 2015 Moritz Klammler <moritz@klammler.eu> # # 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 10 - -m4_define([_AX_CXX_COMPILE_STDCXX_11_testbody], [[ - template <typename T> - struct check - { - static_assert(sizeof(int) <= sizeof(T), "not big enough"); - }; - - struct Base { - virtual void f() {} - }; - struct Child : public Base { - virtual void f() override {} - }; - - 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; - auto l = [](){}; - // Prevent Clang error: unused variable 'l' [-Werror,-Wunused-variable] - struct use_l { use_l() { l(); } }; - - // http://stackoverflow.com/questions/13728184/template-aliases-and-sfinae - // Clang 3.1 fails with headers of libstd++ 4.8.3 when using std::function because of this - namespace test_template_alias_sfinae { - struct foo {}; - - template<typename T> - using member = typename T::member_type; - - template<typename T> - void func(...) {} - - template<typename T> - void func(member<T>*) {} - - void test(); - - void test() { - func<foo>(0); - } - } -]]) - -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])]) - 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 +#serial 18 - AC_SUBST(HAVE_CXX11) - fi -]) +AX_REQUIRE_DEFINED([AX_CXX_COMPILE_STDCXX]) +AC_DEFUN([AX_CXX_COMPILE_STDCXX_11], [AX_CXX_COMPILE_STDCXX([11], [$1], [$2])]) |