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@ -20,603 +20,6 @@ You have another version of autoconf. It may work, but is not guaranteed to.
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If you have problems, you may need to regenerate the build system entirely.
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To do so, use the procedure documented by the package, typically 'autoreconf'.])])
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# ===========================================================================
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# http://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_CXX_COMPILE_STDCXX(VERSION, [ext|noext], [mandatory|optional])
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#
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# DESCRIPTION
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#
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# Check for baseline language coverage in the compiler for the specified
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# version of the C++ standard. If necessary, add switches to CXX to
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# enable support. VERSION may be '11' (for the C++11 standard) or '14'
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# (for the C++14 standard).
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#
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# The second argument, if specified, indicates whether you insist on an
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# extended mode (e.g. -std=gnu++11) or a strict conformance mode (e.g.
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# -std=c++11). If neither is specified, you get whatever works, with
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# preference for an extended mode.
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#
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# The third argument, if specified 'mandatory' or if left unspecified,
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# indicates that baseline support for the specified C++ standard is
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# required and that the macro should error out if no mode with that
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# support is found. If specified 'optional', then configuration proceeds
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# regardless, after defining HAVE_CXX${VERSION} if and only if a
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# supporting mode is found.
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#
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# LICENSE
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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, 2015 Google Inc.; contributed by Alexey Sokolov <sokolov@google.com>
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# Copyright (c) 2015 Paul Norman <penorman@mac.com>
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# Copyright (c) 2015 Moritz Klammler <moritz@klammler.eu>
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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 3
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dnl This macro is based on the code from the AX_CXX_COMPILE_STDCXX_11 macro
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dnl (serial version number 13).
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AC_DEFUN([AX_CXX_COMPILE_STDCXX], [dnl
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m4_if([$1], [11], [],
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[$1], [14], [],
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[$1], [17], [m4_fatal([support for C++17 not yet implemented in AX_CXX_COMPILE_STDCXX])],
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[m4_fatal([invalid first argument `$1' to AX_CXX_COMPILE_STDCXX])])dnl
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m4_if([$2], [], [],
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[$2], [ext], [],
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[$2], [noext], [],
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[m4_fatal([invalid second argument `$2' to AX_CXX_COMPILE_STDCXX])])dnl
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m4_if([$3], [], [ax_cxx_compile_cxx$1_required=true],
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[$3], [mandatory], [ax_cxx_compile_cxx$1_required=true],
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[$3], [optional], [ax_cxx_compile_cxx$1_required=false],
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[m4_fatal([invalid third argument `$3' to AX_CXX_COMPILE_STDCXX])])
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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++$1 features by default,
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ax_cv_cxx_compile_cxx$1,
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[AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
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[ax_cv_cxx_compile_cxx$1=yes],
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[ax_cv_cxx_compile_cxx$1=no])])
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if test x$ax_cv_cxx_compile_cxx$1 = xyes; then
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ac_success=yes
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fi
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m4_if([$2], [noext], [], [dnl
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if test x$ac_success = xno; then
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for switch in -std=gnu++$1 -std=gnu++0x; do
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cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_$switch])
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AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch,
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$cachevar,
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[ac_save_CXX="$CXX"
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CXX="$CXX $switch"
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
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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 $switch"
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ac_success=yes
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break
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fi
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done
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fi])
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m4_if([$2], [ext], [], [dnl
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if test x$ac_success = xno; then
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dnl HP's aCC needs +std=c++11 according to:
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dnl http://h21007.www2.hp.com/portal/download/files/unprot/aCxx/PDF_Release_Notes/769149-001.pdf
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dnl Cray's crayCC needs "-h std=c++11"
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for switch in -std=c++$1 -std=c++0x +std=c++$1 "-h std=c++$1"; do
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cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_$switch])
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AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch,
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$cachevar,
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[ac_save_CXX="$CXX"
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CXX="$CXX $switch"
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
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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 $switch"
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ac_success=yes
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break
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fi
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done
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fi])
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AC_LANG_POP([C++])
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if test x$ax_cxx_compile_cxx$1_required = xtrue; then
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if test x$ac_success = xno; then
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AC_MSG_ERROR([*** A compiler with support for C++$1 language features is required.])
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fi
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fi
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if test x$ac_success = xno; then
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HAVE_CXX$1=0
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AC_MSG_NOTICE([No compiler with C++$1 support was found])
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else
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HAVE_CXX$1=1
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AC_DEFINE(HAVE_CXX$1,1,
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[define if the compiler supports basic C++$1 syntax])
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fi
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AC_SUBST(HAVE_CXX$1)
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])
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dnl Test body for checking C++11 support
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m4_define([_AX_CXX_COMPILE_STDCXX_testbody_11],
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_AX_CXX_COMPILE_STDCXX_testbody_new_in_11
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)
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dnl Test body for checking C++14 support
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m4_define([_AX_CXX_COMPILE_STDCXX_testbody_14],
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_AX_CXX_COMPILE_STDCXX_testbody_new_in_11
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_AX_CXX_COMPILE_STDCXX_testbody_new_in_14
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)
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dnl Tests for new features in C++11
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m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_11], [[
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// If the compiler admits that it is not ready for C++11, why torture it?
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// Hopefully, this will speed up the test.
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#ifndef __cplusplus
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#error "This is not a C++ compiler"
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#elif __cplusplus < 201103L
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#error "This is not a C++11 compiler"
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#else
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namespace cxx11
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{
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namespace test_static_assert
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{
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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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}
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namespace test_final_override
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{
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struct Base
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{
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virtual void f() {}
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};
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struct Derived : public Base
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{
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virtual void f() override {}
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};
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}
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namespace test_double_right_angle_brackets
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{
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template < typename T >
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struct check {};
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typedef check<void> single_type;
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typedef check<check<void>> double_type;
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typedef check<check<check<void>>> triple_type;
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typedef check<check<check<check<void>>>> quadruple_type;
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}
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namespace test_decltype
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{
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int
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f()
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{
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int a = 1;
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decltype(a) b = 2;
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return a + b;
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}
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}
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namespace test_type_deduction
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{
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template < typename T1, typename T2 >
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struct is_same
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{
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static const bool value = false;
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};
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template < typename T >
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struct is_same<T, T>
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{
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static const bool value = true;
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};
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template < typename T1, typename T2 >
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auto
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add(T1 a1, T2 a2) -> decltype(a1 + a2)
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{
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return a1 + a2;
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}
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int
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test(const int c, volatile int v)
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{
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static_assert(is_same<int, decltype(0)>::value == true, "");
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static_assert(is_same<int, decltype(c)>::value == false, "");
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static_assert(is_same<int, decltype(v)>::value == false, "");
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auto ac = c;
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auto av = v;
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auto sumi = ac + av + 'x';
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auto sumf = ac + av + 1.0;
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static_assert(is_same<int, decltype(ac)>::value == true, "");
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static_assert(is_same<int, decltype(av)>::value == true, "");
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static_assert(is_same<int, decltype(sumi)>::value == true, "");
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static_assert(is_same<int, decltype(sumf)>::value == false, "");
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static_assert(is_same<int, decltype(add(c, v))>::value == true, "");
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|
return (sumf > 0.0) ? sumi : add(c, v);
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}
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}
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namespace test_noexcept
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{
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int f() { return 0; }
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int g() noexcept { return 0; }
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static_assert(noexcept(f()) == false, "");
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|
static_assert(noexcept(g()) == true, "");
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|
}
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namespace test_constexpr
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{
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|
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template < typename CharT >
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|
|
unsigned long constexpr
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|
|
strlen_c_r(const CharT *const s, const unsigned long acc) noexcept
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|
{
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|
|
return *s ? strlen_c_r(s + 1, acc + 1) : acc;
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|
|
}
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|
|
template < typename CharT >
|
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|
|
unsigned long constexpr
|
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|
|
strlen_c(const CharT *const s) noexcept
|
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|
|
{
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|
|
return strlen_c_r(s, 0UL);
|
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|
|
}
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|
|
static_assert(strlen_c("") == 0UL, "");
|
|
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|
|
static_assert(strlen_c("1") == 1UL, "");
|
|
|
|
|
static_assert(strlen_c("example") == 7UL, "");
|
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|
|
static_assert(strlen_c("another\0example") == 7UL, "");
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|
|
}
|
|
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|
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|
|
namespace test_rvalue_references
|
|
|
|
|
{
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|
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|
|
template < int N >
|
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|
|
struct answer
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|
|
{
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|
|
static constexpr int value = N;
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|
};
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|
|
answer<1> f(int&) { return answer<1>(); }
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|
|
answer<2> f(const int&) { return answer<2>(); }
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|
|
answer<3> f(int&&) { return answer<3>(); }
|
|
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|
|
void
|
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|
|
|
test()
|
|
|
|
|
{
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|
|
|
|
int i = 0;
|
|
|
|
|
const int c = 0;
|
|
|
|
|
static_assert(decltype(f(i))::value == 1, "");
|
|
|
|
|
static_assert(decltype(f(c))::value == 2, "");
|
|
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|
|
static_assert(decltype(f(0))::value == 3, "");
|
|
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|
|
}
|
|
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|
|
}
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|
|
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|
|
namespace test_uniform_initialization
|
|
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|
|
{
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|
|
|
|
|
struct test
|
|
|
|
|
{
|
|
|
|
|
static const int zero {};
|
|
|
|
|
static const int one {1};
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
static_assert(test::zero == 0, "");
|
|
|
|
|
static_assert(test::one == 1, "");
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
namespace test_lambdas
|
|
|
|
|
{
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
|
test1()
|
|
|
|
|
{
|
|
|
|
|
auto lambda1 = [](){};
|
|
|
|
|
auto lambda2 = lambda1;
|
|
|
|
|
lambda1();
|
|
|
|
|
lambda2();
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
int
|
|
|
|
|
test2()
|
|
|
|
|
{
|
|
|
|
|
auto a = [](int i, int j){ return i + j; }(1, 2);
|
|
|
|
|
auto b = []() -> int { return '0'; }();
|
|
|
|
|
auto c = [=](){ return a + b; }();
|
|
|
|
|
auto d = [&](){ return c; }();
|
|
|
|
|
auto e = [a, &b](int x) mutable {
|
|
|
|
|
const auto identity = [](int y){ return y; };
|
|
|
|
|
for (auto i = 0; i < a; ++i)
|
|
|
|
|
a += b--;
|
|
|
|
|
return x + identity(a + b);
|
|
|
|
|
}(0);
|
|
|
|
|
return a + b + c + d + e;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
int
|
|
|
|
|
test3()
|
|
|
|
|
{
|
|
|
|
|
const auto nullary = [](){ return 0; };
|
|
|
|
|
const auto unary = [](int x){ return x; };
|
|
|
|
|
using nullary_t = decltype(nullary);
|
|
|
|
|
using unary_t = decltype(unary);
|
|
|
|
|
const auto higher1st = [](nullary_t f){ return f(); };
|
|
|
|
|
const auto higher2nd = [unary](nullary_t f1){
|
|
|
|
|
return [unary, f1](unary_t f2){ return f2(unary(f1())); };
|
|
|
|
|
};
|
|
|
|
|
return higher1st(nullary) + higher2nd(nullary)(unary);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
namespace test_variadic_templates
|
|
|
|
|
{
|
|
|
|
|
|
|
|
|
|
template <int...>
|
|
|
|
|
struct sum;
|
|
|
|
|
|
|
|
|
|
template <int N0, int... N1toN>
|
|
|
|
|
struct sum<N0, N1toN...>
|
|
|
|
|
{
|
|
|
|
|
static constexpr auto value = N0 + sum<N1toN...>::value;
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
template <>
|
|
|
|
|
struct sum<>
|
|
|
|
|
{
|
|
|
|
|
static constexpr auto value = 0;
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
static_assert(sum<>::value == 0, "");
|
|
|
|
|
static_assert(sum<1>::value == 1, "");
|
|
|
|
|
static_assert(sum<23>::value == 23, "");
|
|
|
|
|
static_assert(sum<1, 2>::value == 3, "");
|
|
|
|
|
static_assert(sum<5, 5, 11>::value == 21, "");
|
|
|
|
|
static_assert(sum<2, 3, 5, 7, 11, 13>::value == 41, "");
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// 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); }
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
} // namespace cxx11
|
|
|
|
|
|
|
|
|
|
#endif // __cplusplus >= 201103L
|
|
|
|
|
|
|
|
|
|
]])
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
dnl Tests for new features in C++14
|
|
|
|
|
|
|
|
|
|
m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_14], [[
|
|
|
|
|
|
|
|
|
|
// If the compiler admits that it is not ready for C++14, why torture it?
|
|
|
|
|
// Hopefully, this will speed up the test.
|
|
|
|
|
|
|
|
|
|
#ifndef __cplusplus
|
|
|
|
|
|
|
|
|
|
#error "This is not a C++ compiler"
|
|
|
|
|
|
|
|
|
|
#elif __cplusplus < 201402L
|
|
|
|
|
|
|
|
|
|
#error "This is not a C++14 compiler"
|
|
|
|
|
|
|
|
|
|
#else
|
|
|
|
|
|
|
|
|
|
namespace cxx14
|
|
|
|
|
{
|
|
|
|
|
|
|
|
|
|
namespace test_polymorphic_lambdas
|
|
|
|
|
{
|
|
|
|
|
|
|
|
|
|
int
|
|
|
|
|
test()
|
|
|
|
|
{
|
|
|
|
|
const auto lambda = [](auto&&... args){
|
|
|
|
|
const auto istiny = [](auto x){
|
|
|
|
|
return (sizeof(x) == 1UL) ? 1 : 0;
|
|
|
|
|
};
|
|
|
|
|
const int aretiny[] = { istiny(args)... };
|
|
|
|
|
return aretiny[0];
|
|
|
|
|
};
|
|
|
|
|
return lambda(1, 1L, 1.0f, '1');
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
namespace test_binary_literals
|
|
|
|
|
{
|
|
|
|
|
|
|
|
|
|
constexpr auto ivii = 0b0000000000101010;
|
|
|
|
|
static_assert(ivii == 42, "wrong value");
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
namespace test_generalized_constexpr
|
|
|
|
|
{
|
|
|
|
|
|
|
|
|
|
template < typename CharT >
|
|
|
|
|
constexpr unsigned long
|
|
|
|
|
strlen_c(const CharT *const s) noexcept
|
|
|
|
|
{
|
|
|
|
|
auto length = 0UL;
|
|
|
|
|
for (auto p = s; *p; ++p)
|
|
|
|
|
++length;
|
|
|
|
|
return length;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static_assert(strlen_c("") == 0UL, "");
|
|
|
|
|
static_assert(strlen_c("x") == 1UL, "");
|
|
|
|
|
static_assert(strlen_c("test") == 4UL, "");
|
|
|
|
|
static_assert(strlen_c("another\0test") == 7UL, "");
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
namespace test_lambda_init_capture
|
|
|
|
|
{
|
|
|
|
|
|
|
|
|
|
int
|
|
|
|
|
test()
|
|
|
|
|
{
|
|
|
|
|
auto x = 0;
|
|
|
|
|
const auto lambda1 = [a = x](int b){ return a + b; };
|
|
|
|
|
const auto lambda2 = [a = lambda1(x)](){ return a; };
|
|
|
|
|
return lambda2();
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
namespace test_digit_seperators
|
|
|
|
|
{
|
|
|
|
|
|
|
|
|
|
constexpr auto ten_million = 100'000'000;
|
|
|
|
|
static_assert(ten_million == 100000000, "");
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
namespace test_return_type_deduction
|
|
|
|
|
{
|
|
|
|
|
|
|
|
|
|
auto f(int& x) { return x; }
|
|
|
|
|
decltype(auto) g(int& x) { return x; }
|
|
|
|
|
|
|
|
|
|
template < typename T1, typename T2 >
|
|
|
|
|
struct is_same
|
|
|
|
|
{
|
|
|
|
|
static constexpr auto value = false;
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
template < typename T >
|
|
|
|
|
struct is_same<T, T>
|
|
|
|
|
{
|
|
|
|
|
static constexpr auto value = true;
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
int
|
|
|
|
|
test()
|
|
|
|
|
{
|
|
|
|
|
auto x = 0;
|
|
|
|
|
static_assert(is_same<int, decltype(f(x))>::value, "");
|
|
|
|
|
static_assert(is_same<int&, decltype(g(x))>::value, "");
|
|
|
|
|
return x;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
} // namespace cxx14
|
|
|
|
|
|
|
|
|
|
#endif // __cplusplus >= 201402L
|
|
|
|
|
|
|
|
|
|
]])
|
|
|
|
|
|
|
|
|
|
# ============================================================================
|
|
|
|
|
# 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 CXX to enable support.
|
|
|
|
|
#
|
|
|
|
|
# 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
|
|
|
|
|
#
|
|
|
|
|
# Copyright (c) 2008 Benjamin Kosnik <bkoz@redhat.com>
|
|
|
|
|
# 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 15
|
|
|
|
|
|
|
|
|
|
include([ax_cxx_compile_stdcxx.m4])
|
|
|
|
|
|
|
|
|
|
AC_DEFUN([AX_CXX_COMPILE_STDCXX_11], [AX_CXX_COMPILE_STDCXX([11], [$1], [$2])])
|
|
|
|
|
|
|
|
|
|
# Copyright (C) 2002-2014 Free Software Foundation, Inc.
|
|
|
|
|
#
|
|
|
|
|
# This file is free software; the Free Software Foundation
|
|
|
|
|