Check for C++11 support in the configure script.
R=mark@chromium.org Review URL: https://codereview.chromium.org/1570013002 .
This commit is contained in:
Lei Zhang
parent
7cc0d8562b
commit
cbda3193b1
733
configure
vendored
733
configure
vendored
@ -636,6 +636,7 @@ ANDROID_HOST_FALSE
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ANDROID_HOST_TRUE
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LINUX_HOST_FALSE
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LINUX_HOST_TRUE
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HAVE_CXX11
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PTHREAD_CFLAGS
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PTHREAD_LIBS
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PTHREAD_CC
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@ -5986,7 +5987,7 @@ else
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We can't simply define LARGE_OFF_T to be 9223372036854775807,
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since some C++ compilers masquerading as C compilers
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incorrectly reject 9223372036854775807. */
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#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
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#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
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int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
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&& LARGE_OFF_T % 2147483647 == 1)
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? 1 : -1];
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@ -6032,7 +6033,7 @@ else
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We can't simply define LARGE_OFF_T to be 9223372036854775807,
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since some C++ compilers masquerading as C compilers
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incorrectly reject 9223372036854775807. */
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#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
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#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
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int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
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&& LARGE_OFF_T % 2147483647 == 1)
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? 1 : -1];
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@ -6056,7 +6057,7 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
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We can't simply define LARGE_OFF_T to be 9223372036854775807,
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since some C++ compilers masquerading as C compilers
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incorrectly reject 9223372036854775807. */
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#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
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#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
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int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
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&& LARGE_OFF_T % 2147483647 == 1)
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? 1 : -1];
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@ -6101,7 +6102,7 @@ else
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We can't simply define LARGE_OFF_T to be 9223372036854775807,
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since some C++ compilers masquerading as C compilers
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incorrectly reject 9223372036854775807. */
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#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
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#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
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int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
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&& LARGE_OFF_T % 2147483647 == 1)
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? 1 : -1];
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@ -6125,7 +6126,7 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
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We can't simply define LARGE_OFF_T to be 9223372036854775807,
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since some C++ compilers masquerading as C compilers
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incorrectly reject 9223372036854775807. */
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#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
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#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
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int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
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&& LARGE_OFF_T % 2147483647 == 1)
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? 1 : -1];
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@ -6644,6 +6645,728 @@ fi
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done
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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 CXXFLAGS 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${VERSION} if and only if a
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# supporting mode is found.
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#
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# LICENSE
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#
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# Copyright (c) 2008 Benjamin Kosnik <bkoz@redhat.com>
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# Copyright (c) 2012 Zack Weinberg <zackw@panix.com>
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# Copyright (c) 2013 Roy Stogner <roystgnr@ices.utexas.edu>
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# Copyright (c) 2014, 2015 Google Inc.; contributed by Alexey Sokolov <sokolov@google.com>
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# Copyright (c) 2015 Paul Norman <penorman@mac.com>
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# Copyright (c) 2015 Moritz Klammler <moritz@klammler.eu>
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#
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# Copying and distribution of this file, with or without modification, are
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# permitted in any medium without royalty provided the copyright notice
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# and this notice are preserved. This file is offered as-is, without any
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# warranty.
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#serial 1
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ax_cxx_compile_cxx11_required=true
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ac_ext=cpp
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ac_cpp='$CXXCPP $CPPFLAGS'
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ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
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ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
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ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
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ac_success=no
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CXX supports C++11 features by default" >&5
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$as_echo_n "checking whether $CXX supports C++11 features by default... " >&6; }
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if ${ax_cv_cxx_compile_cxx11+:} false; then :
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$as_echo_n "(cached) " >&6
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else
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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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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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, "");
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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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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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{
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int i = 0;
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const int c = 0;
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static_assert(decltype(f(i))::value == 1, "");
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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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namespace test_uniform_initialization
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{
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struct test
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{
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static const int zero {};
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static const int one {1};
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};
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static_assert(test::zero == 0, "");
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static_assert(test::one == 1, "");
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}
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namespace test_lambdas
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{
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void
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test1()
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{
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auto lambda1 = [](){};
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auto lambda2 = lambda1;
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lambda1();
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lambda2();
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}
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int
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test2()
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{
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auto a = [](int i, int j){ return i + j; }(1, 2);
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auto b = []() -> int { return '0'; }();
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auto c = [=](){ return a + b; }();
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auto d = [&](){ return c; }();
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auto e = [a, &b](int x) mutable {
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const auto identity = [](int y){ return y; };
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for (auto i = 0; i < a; ++i)
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a += b--;
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return x + identity(a + b);
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}(0);
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return a + b + c + d + e;
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}
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int
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test3()
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{
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const auto nullary = [](){ return 0; };
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const auto unary = [](int x){ return x; };
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using nullary_t = decltype(nullary);
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using unary_t = decltype(unary);
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const auto higher1st = [](nullary_t f){ return f(); };
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const auto higher2nd = [unary](nullary_t f1){
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return [unary, f1](unary_t f2){ return f2(unary(f1())); };
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};
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return higher1st(nullary) + higher2nd(nullary)(unary);
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}
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}
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namespace test_variadic_templates
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{
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template <int...>
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struct sum;
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template <int N0, int... N1toN>
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struct sum<N0, N1toN...>
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{
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static constexpr auto value = N0 + sum<N1toN...>::value;
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};
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template <>
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struct sum<>
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{
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static constexpr auto value = 0;
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};
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static_assert(sum<>::value == 0, "");
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static_assert(sum<1>::value == 1, "");
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static_assert(sum<23>::value == 23, "");
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static_assert(sum<1, 2>::value == 3, "");
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static_assert(sum<5, 5, 11>::value == 21, "");
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static_assert(sum<2, 3, 5, 7, 11, 13>::value == 41, "");
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}
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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
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// because of this.
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namespace test_template_alias_sfinae
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{
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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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void test() { func<foo>(0); }
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}
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} // namespace cxx11
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#endif // __cplusplus >= 201103L
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_ACEOF
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if ac_fn_cxx_try_compile "$LINENO"; then :
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ax_cv_cxx_compile_cxx11=yes
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else
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ax_cv_cxx_compile_cxx11=no
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fi
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rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
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fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ax_cv_cxx_compile_cxx11" >&5
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$as_echo "$ax_cv_cxx_compile_cxx11" >&6; }
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if test x$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$ac_success = xno; then
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for switch in -std=c++11 -std=c++0x +std=c++11 "-h std=c++11"; do
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cachevar=`$as_echo "ax_cv_cxx_compile_cxx11_$switch" | $as_tr_sh`
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CXX supports C++11 features with $switch" >&5
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$as_echo_n "checking whether $CXX supports C++11 features with $switch... " >&6; }
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if eval \${$cachevar+:} false; then :
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$as_echo_n "(cached) " >&6
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else
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ac_save_CXXFLAGS="$CXXFLAGS"
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CXXFLAGS="$CXXFLAGS $switch"
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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|
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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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|
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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 >
|
||||
struct check {};
|
||||
|
||||
typedef check<void> single_type;
|
||||
typedef check<check<void>> double_type;
|
||||
typedef check<check<check<void>>> triple_type;
|
||||
typedef check<check<check<check<void>>>> quadruple_type;
|
||||
|
||||
}
|
||||
|
||||
namespace test_decltype
|
||||
{
|
||||
|
||||
int
|
||||
f()
|
||||
{
|
||||
int a = 1;
|
||||
decltype(a) b = 2;
|
||||
return a + b;
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
namespace test_type_deduction
|
||||
{
|
||||
|
||||
template < typename T1, typename T2 >
|
||||
struct is_same
|
||||
{
|
||||
static const bool value = false;
|
||||
};
|
||||
|
||||
template < typename T >
|
||||
struct is_same<T, T>
|
||||
{
|
||||
static const bool value = true;
|
||||
};
|
||||
|
||||
template < typename T1, typename T2 >
|
||||
auto
|
||||
add(T1 a1, T2 a2) -> decltype(a1 + a2)
|
||||
{
|
||||
return a1 + a2;
|
||||
}
|
||||
|
||||
int
|
||||
test(const int c, volatile int v)
|
||||
{
|
||||
static_assert(is_same<int, decltype(0)>::value == true, "");
|
||||
static_assert(is_same<int, decltype(c)>::value == false, "");
|
||||
static_assert(is_same<int, decltype(v)>::value == false, "");
|
||||
auto ac = c;
|
||||
auto av = v;
|
||||
auto sumi = ac + av + 'x';
|
||||
auto sumf = ac + av + 1.0;
|
||||
static_assert(is_same<int, decltype(ac)>::value == true, "");
|
||||
static_assert(is_same<int, decltype(av)>::value == true, "");
|
||||
static_assert(is_same<int, decltype(sumi)>::value == true, "");
|
||||
static_assert(is_same<int, decltype(sumf)>::value == false, "");
|
||||
static_assert(is_same<int, decltype(add(c, v))>::value == true, "");
|
||||
return (sumf > 0.0) ? sumi : add(c, v);
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
namespace test_noexcept
|
||||
{
|
||||
|
||||
int f() { return 0; }
|
||||
int g() noexcept { return 0; }
|
||||
|
||||
static_assert(noexcept(f()) == false, "");
|
||||
static_assert(noexcept(g()) == true, "");
|
||||
|
||||
}
|
||||
|
||||
namespace test_constexpr
|
||||
{
|
||||
|
||||
template < typename CharT >
|
||||
unsigned long constexpr
|
||||
strlen_c_r(const CharT *const s, const unsigned long acc) noexcept
|
||||
{
|
||||
return *s ? strlen_c_r(s + 1, acc + 1) : acc;
|
||||
}
|
||||
|
||||
template < typename CharT >
|
||||
unsigned long constexpr
|
||||
strlen_c(const CharT *const s) noexcept
|
||||
{
|
||||
return strlen_c_r(s, 0UL);
|
||||
}
|
||||
|
||||
static_assert(strlen_c("") == 0UL, "");
|
||||
static_assert(strlen_c("1") == 1UL, "");
|
||||
static_assert(strlen_c("example") == 7UL, "");
|
||||
static_assert(strlen_c("another\0example") == 7UL, "");
|
||||
|
||||
}
|
||||
|
||||
namespace test_rvalue_references
|
||||
{
|
||||
|
||||
template < int N >
|
||||
struct answer
|
||||
{
|
||||
static constexpr int value = N;
|
||||
};
|
||||
|
||||
answer<1> f(int&) { return answer<1>(); }
|
||||
answer<2> f(const int&) { return answer<2>(); }
|
||||
answer<3> f(int&&) { return answer<3>(); }
|
||||
|
||||
void
|
||||
test()
|
||||
{
|
||||
int i = 0;
|
||||
const int c = 0;
|
||||
static_assert(decltype(f(i))::value == 1, "");
|
||||
static_assert(decltype(f(c))::value == 2, "");
|
||||
static_assert(decltype(f(0))::value == 3, "");
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
namespace test_uniform_initialization
|
||||
{
|
||||
|
||||
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
|
||||
|
||||
|
||||
|
||||
_ACEOF
|
||||
if ac_fn_cxx_try_compile "$LINENO"; then :
|
||||
eval $cachevar=yes
|
||||
else
|
||||
eval $cachevar=no
|
||||
fi
|
||||
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
|
||||
CXXFLAGS="$ac_save_CXXFLAGS"
|
||||
fi
|
||||
eval ac_res=\$$cachevar
|
||||
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
|
||||
$as_echo "$ac_res" >&6; }
|
||||
if eval test x\$$cachevar = xyes; then
|
||||
CXXFLAGS="$CXXFLAGS $switch"
|
||||
ac_success=yes
|
||||
break
|
||||
fi
|
||||
done
|
||||
fi
|
||||
ac_ext=c
|
||||
ac_cpp='$CPP $CPPFLAGS'
|
||||
ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
|
||||
ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
|
||||
ac_compiler_gnu=$ac_cv_c_compiler_gnu
|
||||
|
||||
if test x$ax_cxx_compile_cxx11_required = xtrue; then
|
||||
if test x$ac_success = xno; then
|
||||
as_fn_error $? "*** A compiler with support for C++11 language features is required." "$LINENO" 5
|
||||
fi
|
||||
else
|
||||
if test x$ac_success = xno; then
|
||||
HAVE_CXX11=0
|
||||
{ $as_echo "$as_me:${as_lineno-$LINENO}: No compiler with C++11 support was found" >&5
|
||||
$as_echo "$as_me: No compiler with C++11 support was found" >&6;}
|
||||
else
|
||||
HAVE_CXX11=1
|
||||
|
||||
$as_echo "#define HAVE_CXX11 1" >>confdefs.h
|
||||
|
||||
fi
|
||||
|
||||
|
||||
fi
|
||||
|
||||
|
||||
# Only build Linux client libs when compiling for Linux
|
||||
case $host in
|
||||
*-*-linux* | *-android* )
|
||||
|
||||
@ -76,6 +76,9 @@ m4_include(m4/ax_pthread.m4)
|
||||
AX_PTHREAD
|
||||
AC_CHECK_HEADERS([a.out.h])
|
||||
|
||||
m4_include(m4/ax_cxx_compile_stdcxx.m4)
|
||||
AX_CXX_COMPILE_STDCXX(11, noext, mandatory)
|
||||
|
||||
# Only build Linux client libs when compiling for Linux
|
||||
case $host in
|
||||
*-*-linux* | *-android* )
|
||||
|
||||
558
m4/ax_cxx_compile_stdcxx.m4
Normal file
558
m4/ax_cxx_compile_stdcxx.m4
Normal file
@ -0,0 +1,558 @@
|
||||
# ===========================================================================
|
||||
# http://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx.html
|
||||
# ===========================================================================
|
||||
#
|
||||
# SYNOPSIS
|
||||
#
|
||||
# AX_CXX_COMPILE_STDCXX(VERSION, [ext|noext], [mandatory|optional])
|
||||
#
|
||||
# DESCRIPTION
|
||||
#
|
||||
# Check for baseline language coverage in the compiler for the specified
|
||||
# version of the C++ standard. If necessary, add switches to CXXFLAGS to
|
||||
# enable support. VERSION may be '11' (for the C++11 standard) or '14'
|
||||
# (for the C++14 standard).
|
||||
#
|
||||
# The second argument, if specified, indicates whether you insist on an
|
||||
# extended mode (e.g. -std=gnu++11) or a strict conformance mode (e.g.
|
||||
# -std=c++11). If neither is specified, you get whatever works, with
|
||||
# preference for an extended mode.
|
||||
#
|
||||
# The third argument, if specified 'mandatory' or if left unspecified,
|
||||
# indicates that baseline support for the specified C++ standard is
|
||||
# required and that the macro should error out if no mode with that
|
||||
# support is found. If specified 'optional', then configuration proceeds
|
||||
# regardless, after defining HAVE_CXX${VERSION} if and only if a
|
||||
# supporting mode is found.
|
||||
#
|
||||
# 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 1
|
||||
|
||||
dnl This macro is based on the code from the AX_CXX_COMPILE_STDCXX_11 macro
|
||||
dnl (serial version number 13).
|
||||
|
||||
AC_DEFUN([AX_CXX_COMPILE_STDCXX], [dnl
|
||||
m4_if([$1], [11], [],
|
||||
[$1], [14], [],
|
||||
[$1], [17], [m4_fatal([support for C++17 not yet implemented in AX_CXX_COMPILE_STDCXX])],
|
||||
[m4_fatal([invalid first argument `$1' to AX_CXX_COMPILE_STDCXX])])dnl
|
||||
m4_if([$2], [], [],
|
||||
[$2], [ext], [],
|
||||
[$2], [noext], [],
|
||||
[m4_fatal([invalid second argument `$2' to AX_CXX_COMPILE_STDCXX])])dnl
|
||||
m4_if([$3], [], [ax_cxx_compile_cxx$1_required=true],
|
||||
[$3], [mandatory], [ax_cxx_compile_cxx$1_required=true],
|
||||
[$3], [optional], [ax_cxx_compile_cxx$1_required=false],
|
||||
[m4_fatal([invalid third argument `$3' to AX_CXX_COMPILE_STDCXX])])
|
||||
AC_LANG_PUSH([C++])dnl
|
||||
ac_success=no
|
||||
AC_CACHE_CHECK(whether $CXX supports C++$1 features by default,
|
||||
ax_cv_cxx_compile_cxx$1,
|
||||
[AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
|
||||
[ax_cv_cxx_compile_cxx$1=yes],
|
||||
[ax_cv_cxx_compile_cxx$1=no])])
|
||||
if test x$ax_cv_cxx_compile_cxx$1 = xyes; then
|
||||
ac_success=yes
|
||||
fi
|
||||
|
||||
m4_if([$2], [noext], [], [dnl
|
||||
if test x$ac_success = xno; then
|
||||
for switch in -std=gnu++$1 -std=gnu++0x; do
|
||||
cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_$switch])
|
||||
AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch,
|
||||
$cachevar,
|
||||
[ac_save_CXXFLAGS="$CXXFLAGS"
|
||||
CXXFLAGS="$CXXFLAGS $switch"
|
||||
AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
|
||||
[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([$2], [ext], [], [dnl
|
||||
if test x$ac_success = xno; then
|
||||
dnl HP's aCC needs +std=c++11 according to:
|
||||
dnl http://h21007.www2.hp.com/portal/download/files/unprot/aCxx/PDF_Release_Notes/769149-001.pdf
|
||||
dnl Cray's crayCC needs "-h std=c++11"
|
||||
for switch in -std=c++$1 -std=c++0x +std=c++$1 "-h std=c++$1"; do
|
||||
cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_$switch])
|
||||
AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch,
|
||||
$cachevar,
|
||||
[ac_save_CXXFLAGS="$CXXFLAGS"
|
||||
CXXFLAGS="$CXXFLAGS $switch"
|
||||
AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
|
||||
[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_cxx$1_required = xtrue; then
|
||||
if test x$ac_success = xno; then
|
||||
AC_MSG_ERROR([*** A compiler with support for C++$1 language features is required.])
|
||||
fi
|
||||
else
|
||||
if test x$ac_success = xno; then
|
||||
HAVE_CXX$1=0
|
||||
AC_MSG_NOTICE([No compiler with C++$1 support was found])
|
||||
else
|
||||
HAVE_CXX$1=1
|
||||
AC_DEFINE(HAVE_CXX$1,1,
|
||||
[define if the compiler supports basic C++$1 syntax])
|
||||
fi
|
||||
|
||||
AC_SUBST(HAVE_CXX$1)
|
||||
fi
|
||||
])
|
||||
|
||||
|
||||
dnl Test body for checking C++11 support
|
||||
|
||||
m4_define([_AX_CXX_COMPILE_STDCXX_testbody_11],
|
||||
_AX_CXX_COMPILE_STDCXX_testbody_new_in_11
|
||||
)
|
||||
|
||||
|
||||
dnl Test body for checking C++14 support
|
||||
|
||||
m4_define([_AX_CXX_COMPILE_STDCXX_testbody_14],
|
||||
_AX_CXX_COMPILE_STDCXX_testbody_new_in_11
|
||||
_AX_CXX_COMPILE_STDCXX_testbody_new_in_14
|
||||
)
|
||||
|
||||
|
||||
dnl Tests for new features in C++11
|
||||
|
||||
m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_11], [[
|
||||
|
||||
// If the compiler admits that it is not ready for C++11, why torture it?
|
||||
// Hopefully, this will speed up the test.
|
||||
|
||||
#ifndef __cplusplus
|
||||
|
||||
#error "This is not a C++ compiler"
|
||||
|
||||
#elif __cplusplus < 201103L
|
||||
|
||||
#error "This is not a C++11 compiler"
|
||||
|
||||
#else
|
||||
|
||||
namespace cxx11
|
||||
{
|
||||
|
||||
namespace test_static_assert
|
||||
{
|
||||
|
||||
template <typename T>
|
||||
struct check
|
||||
{
|
||||
static_assert(sizeof(int) <= sizeof(T), "not big enough");
|
||||
};
|
||||
|
||||
}
|
||||
|
||||
namespace test_final_override
|
||||
{
|
||||
|
||||
struct Base
|
||||
{
|
||||
virtual void f() {}
|
||||
};
|
||||
|
||||
struct Derived : public Base
|
||||
{
|
||||
virtual void f() override {}
|
||||
};
|
||||
|
||||
}
|
||||
|
||||
namespace test_double_right_angle_brackets
|
||||
{
|
||||
|
||||
template < typename T >
|
||||
struct check {};
|
||||
|
||||
typedef check<void> single_type;
|
||||
typedef check<check<void>> double_type;
|
||||
typedef check<check<check<void>>> triple_type;
|
||||
typedef check<check<check<check<void>>>> quadruple_type;
|
||||
|
||||
}
|
||||
|
||||
namespace test_decltype
|
||||
{
|
||||
|
||||
int
|
||||
f()
|
||||
{
|
||||
int a = 1;
|
||||
decltype(a) b = 2;
|
||||
return a + b;
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
namespace test_type_deduction
|
||||
{
|
||||
|
||||
template < typename T1, typename T2 >
|
||||
struct is_same
|
||||
{
|
||||
static const bool value = false;
|
||||
};
|
||||
|
||||
template < typename T >
|
||||
struct is_same<T, T>
|
||||
{
|
||||
static const bool value = true;
|
||||
};
|
||||
|
||||
template < typename T1, typename T2 >
|
||||
auto
|
||||
add(T1 a1, T2 a2) -> decltype(a1 + a2)
|
||||
{
|
||||
return a1 + a2;
|
||||
}
|
||||
|
||||
int
|
||||
test(const int c, volatile int v)
|
||||
{
|
||||
static_assert(is_same<int, decltype(0)>::value == true, "");
|
||||
static_assert(is_same<int, decltype(c)>::value == false, "");
|
||||
static_assert(is_same<int, decltype(v)>::value == false, "");
|
||||
auto ac = c;
|
||||
auto av = v;
|
||||
auto sumi = ac + av + 'x';
|
||||
auto sumf = ac + av + 1.0;
|
||||
static_assert(is_same<int, decltype(ac)>::value == true, "");
|
||||
static_assert(is_same<int, decltype(av)>::value == true, "");
|
||||
static_assert(is_same<int, decltype(sumi)>::value == true, "");
|
||||
static_assert(is_same<int, decltype(sumf)>::value == false, "");
|
||||
static_assert(is_same<int, decltype(add(c, v))>::value == true, "");
|
||||
return (sumf > 0.0) ? sumi : add(c, v);
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
namespace test_noexcept
|
||||
{
|
||||
|
||||
int f() { return 0; }
|
||||
int g() noexcept { return 0; }
|
||||
|
||||
static_assert(noexcept(f()) == false, "");
|
||||
static_assert(noexcept(g()) == true, "");
|
||||
|
||||
}
|
||||
|
||||
namespace test_constexpr
|
||||
{
|
||||
|
||||
template < typename CharT >
|
||||
unsigned long constexpr
|
||||
strlen_c_r(const CharT *const s, const unsigned long acc) noexcept
|
||||
{
|
||||
return *s ? strlen_c_r(s + 1, acc + 1) : acc;
|
||||
}
|
||||
|
||||
template < typename CharT >
|
||||
unsigned long constexpr
|
||||
strlen_c(const CharT *const s) noexcept
|
||||
{
|
||||
return strlen_c_r(s, 0UL);
|
||||
}
|
||||
|
||||
static_assert(strlen_c("") == 0UL, "");
|
||||
static_assert(strlen_c("1") == 1UL, "");
|
||||
static_assert(strlen_c("example") == 7UL, "");
|
||||
static_assert(strlen_c("another\0example") == 7UL, "");
|
||||
|
||||
}
|
||||
|
||||
namespace test_rvalue_references
|
||||
{
|
||||
|
||||
template < int N >
|
||||
struct answer
|
||||
{
|
||||
static constexpr int value = N;
|
||||
};
|
||||
|
||||
answer<1> f(int&) { return answer<1>(); }
|
||||
answer<2> f(const int&) { return answer<2>(); }
|
||||
answer<3> f(int&&) { return answer<3>(); }
|
||||
|
||||
void
|
||||
test()
|
||||
{
|
||||
int i = 0;
|
||||
const int c = 0;
|
||||
static_assert(decltype(f(i))::value == 1, "");
|
||||
static_assert(decltype(f(c))::value == 2, "");
|
||||
static_assert(decltype(f(0))::value == 3, "");
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
namespace test_uniform_initialization
|
||||
{
|
||||
|
||||
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
|
||||
|
||||
]])
|
||||
Loading…
Reference in New Issue
Block a user