107 lines
2.9 KiB
Plaintext
107 lines
2.9 KiB
Plaintext
# Test for std c++11 compiler support
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#
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# trimmed down verision of AX_CXX_COMPILE_STDCXX_11
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# from the GNU Autoconf Archive
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#
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# Copyright (c) 2008 Benjamin Kosnik <bkoz@redhat.com>
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# Copyright (c) 2012 Zack Weinberg <zackw@panix.com>
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# Copyright (c) 2013 Roy Stogner <roystgnr@ices.utexas.edu>
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# Copyright (c) 2014 Alexey Sokolov <sokolov@google.com>
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# Copyright (c) 2014, 2015 Google Inc.
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#
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# Copying and distribution of this file, with or without modification, are
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# permitted in any medium without royalty provided the copyright notice
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# and this notice are preserved. This file is offered as-is, without any
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# warranty.
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#serial 7
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m4_define([_AX_CXX_COMPILE_STDCXX_11_testbody], [[
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template <typename T>
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struct check
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{
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static_assert(sizeof(int) <= sizeof(T), "not big enough");
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};
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struct Base {
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virtual void f() {}
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};
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struct Child : public Base {
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virtual void f() override {}
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};
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typedef check<check<bool>> right_angle_brackets;
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int a;
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decltype(a) b;
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typedef check<int> check_type;
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check_type c;
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check_type&& cr = static_cast<check_type&&>(c);
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auto d = a;
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auto l = [](){};
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// http://stackoverflow.com/questions/13728184/template-aliases-and-sfinae
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// Clang 3.1 fails with headers of libstd++ 4.8.3 when using std::function because of this
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namespace test_template_alias_sfinae {
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struct foo {};
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template<typename T>
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using member = typename T::member_type;
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template<typename T>
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void func(...) {}
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template<typename T>
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void func(member<T>*) {}
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void test() {
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func<foo>(0);
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}
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}
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]])
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AC_DEFUN([SID_CXX_COMPILE_STDCXX_11], [dnl
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AC_LANG_PUSH([C++])dnl
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ac_success=no
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AC_CACHE_CHECK(whether $CXX supports C++11 features by default,
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ax_cv_cxx_compile_cxx11,
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[AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_11_testbody])],
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[ax_cv_cxx_compile_cxx11=yes],
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[ax_cv_cxx_compile_cxx11=no])])
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if test x$ax_cv_cxx_compile_cxx11 = xyes; then
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ac_success=yes
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fi
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if test x$ac_success = xno; then
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cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx11_-std=c++11])
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AC_CACHE_CHECK(whether $CXX supports C++11 features with -std=c++11,
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$cachevar,
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[ac_save_CXX="$CXX"
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CXX="$CXX -std=c++11"
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_11_testbody])],
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[eval $cachevar=yes],
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[eval $cachevar=no])
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CXX="$ac_save_CXX"])
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if eval test x\$$cachevar = xyes; then
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CXX="$CXX -std=c++11"
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ac_success=yes
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break
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fi
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fi
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AC_LANG_POP([C++])
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if test x$ac_success = xno; then
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HAVE_CXX11=0
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AC_MSG_NOTICE([No compiler with C++11 support was found])
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else
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HAVE_CXX11=1
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AC_DEFINE(HAVE_CXX11,1,
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[define if the compiler supports basic C++11 syntax])
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fi
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AC_SUBST(HAVE_CXX11)
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])
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