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-rw-r--r--m4/ax_cxx_compile_stdcxx_11.m4160
1 files changed, 17 insertions, 143 deletions
diff --git a/m4/ax_cxx_compile_stdcxx_11.m4 b/m4/ax_cxx_compile_stdcxx_11.m4
index a9a8f58..1733fd8 100644
--- a/m4/ax_cxx_compile_stdcxx_11.m4
+++ b/m4/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])])
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