enables C++17 mode
Breakpad has started to use C++17 features, and needs to be compiled using C++17. Bug: b:238678030, b:243982778 Test: Locally, CQ Change-Id: Ia339f0815d2efd2a49fa9b788044b5b0163f95fa Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/3954471 Reviewed-by: Mark Mentovai <mark@chromium.org> Reviewed-by: Manoj Gupta <manojgupta@chromium.org> Reviewed-by: Joshua Peraza <jperaza@chromium.org>
This commit is contained in:
Christopher Di Bella
Mark Mentovai
parent
ef443fbf77
commit
f9bf260e94
5 changed files with 1041 additions and 386 deletions
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@ -2446,7 +2446,7 @@ GMOCK_LIBS = @GMOCK_LIBS@
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GREP = @GREP@
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GTEST_CFLAGS = @GTEST_CFLAGS@
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GTEST_LIBS = @GTEST_LIBS@
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HAVE_CXX11 = @HAVE_CXX11@
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HAVE_CXX17 = @HAVE_CXX17@
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INSTALL = @INSTALL@
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INSTALL_DATA = @INSTALL_DATA@
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INSTALL_PROGRAM = @INSTALL_PROGRAM@
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868
configure
vendored
868
configure
vendored
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@ -676,7 +676,7 @@ ANDROID_HOST_TRUE
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LINUX_HOST_FALSE
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LINUX_HOST_TRUE
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WARN_CXXFLAGS
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HAVE_CXX11
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HAVE_CXX17
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HAVE_MEMFD_CREATE_FALSE
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HAVE_MEMFD_CREATE_TRUE
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HAVE_GETCONTEXT_FALSE
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@ -7740,336 +7740,31 @@ fi
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ax_cxx_compile_cxx11_required=true
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ax_cxx_compile_alternatives="17 1z" ax_cxx_compile_cxx17_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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{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether $CXX supports C++11 features by default" >&5
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printf %s "checking whether $CXX supports C++11 features by default... " >&6; }
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if test ${ax_cv_cxx_compile_cxx11+y}
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then :
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printf %s "(cached) " >&6
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else $as_nop
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cat confdefs.h - <<_ACEOF >conftest.$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"
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then :
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ax_cv_cxx_compile_cxx11=yes
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else $as_nop
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ax_cv_cxx_compile_cxx11=no
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fi
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rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
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fi
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{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ax_cv_cxx_compile_cxx11" >&5
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printf "%s\n" "$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=`printf "%s\n" "ax_cv_cxx_compile_cxx11_$switch" | $as_tr_sh`
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{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether $CXX supports C++11 features with $switch" >&5
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printf %s "checking whether $CXX supports C++11 features with $switch... " >&6; }
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for alternative in ${ax_cxx_compile_alternatives}; do
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for switch in -std=c++${alternative} +std=c++${alternative} "-h std=c++${alternative}"; do
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cachevar=`printf "%s\n" "ax_cv_cxx_compile_cxx17_$switch" | $as_tr_sh`
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{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether $CXX supports C++17 features with $switch" >&5
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printf %s "checking whether $CXX supports C++17 features with $switch... " >&6; }
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if eval test \${$cachevar+y}
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then :
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printf %s "(cached) " >&6
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else $as_nop
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ac_save_CXXFLAGS="$CXXFLAGS"
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CXXFLAGS="$CXXFLAGS $switch"
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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ac_save_CXX="$CXX"
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CXX="$CXX $switch"
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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@ -8080,7 +7775,11 @@ else $as_nop
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#error "This is not a C++ compiler"
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#elif __cplusplus < 201103L
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// MSVC always sets __cplusplus to 199711L in older versions; newer versions
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// only set it correctly if /Zc:__cplusplus is specified as well as a
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// /std:c++NN switch:
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// https://devblogs.microsoft.com/cppblog/msvc-now-correctly-reports-__cplusplus/
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#elif __cplusplus < 201103L && !defined _MSC_VER
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#error "This is not a C++11 compiler"
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@ -8105,11 +7804,13 @@ namespace cxx11
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struct Base
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{
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virtual ~Base() {}
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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 ~Derived() override {}
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virtual void f() override {}
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};
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@ -8357,6 +8058,504 @@ namespace cxx11
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// If the compiler admits that it is not ready for C++14, 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 < 201402L && !defined _MSC_VER
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#error "This is not a C++14 compiler"
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#else
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namespace cxx14
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{
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namespace test_polymorphic_lambdas
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{
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int
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test()
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{
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const auto lambda = [](auto&&... args){
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const auto istiny = [](auto x){
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return (sizeof(x) == 1UL) ? 1 : 0;
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};
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const int aretiny[] = { istiny(args)... };
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return aretiny[0];
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};
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return lambda(1, 1L, 1.0f, '1');
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}
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|
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}
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namespace test_binary_literals
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{
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constexpr auto ivii = 0b0000000000101010;
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static_assert(ivii == 42, "wrong value");
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}
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namespace test_generalized_constexpr
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{
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template < typename CharT >
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constexpr unsigned long
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strlen_c(const CharT *const s) noexcept
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{
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auto length = 0UL;
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for (auto p = s; *p; ++p)
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++length;
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return length;
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}
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static_assert(strlen_c("") == 0UL, "");
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static_assert(strlen_c("x") == 1UL, "");
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static_assert(strlen_c("test") == 4UL, "");
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static_assert(strlen_c("another\0test") == 7UL, "");
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|
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}
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|
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namespace test_lambda_init_capture
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{
|
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|
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int
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test()
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{
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auto x = 0;
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const auto lambda1 = [a = x](int b){ return a + b; };
|
||||
const auto lambda2 = [a = lambda1(x)](){ return a; };
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return lambda2();
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||||
}
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||||
|
||||
}
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|
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namespace test_digit_separators
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{
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|
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constexpr auto ten_million = 100'000'000;
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static_assert(ten_million == 100000000, "");
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|
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}
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|
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namespace test_return_type_deduction
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{
|
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|
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auto f(int& x) { return x; }
|
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decltype(auto) g(int& x) { return x; }
|
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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 constexpr auto value = false;
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};
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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 constexpr auto value = true;
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};
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|
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int
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test()
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{
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auto x = 0;
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static_assert(is_same<int, decltype(f(x))>::value, "");
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static_assert(is_same<int&, decltype(g(x))>::value, "");
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return x;
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}
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|
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}
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|
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} // namespace cxx14
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|
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#endif // __cplusplus >= 201402L
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|
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|
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|
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|
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// If the compiler admits that it is not ready for C++17, why torture it?
|
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// Hopefully, this will speed up the test.
|
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|
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#ifndef __cplusplus
|
||||
|
||||
#error "This is not a C++ compiler"
|
||||
|
||||
#elif __cplusplus < 201703L && !defined _MSC_VER
|
||||
|
||||
#error "This is not a C++17 compiler"
|
||||
|
||||
#else
|
||||
|
||||
#include <initializer_list>
|
||||
#include <utility>
|
||||
#include <type_traits>
|
||||
|
||||
namespace cxx17
|
||||
{
|
||||
|
||||
namespace test_constexpr_lambdas
|
||||
{
|
||||
|
||||
constexpr int foo = [](){return 42;}();
|
||||
|
||||
}
|
||||
|
||||
namespace test::nested_namespace::definitions
|
||||
{
|
||||
|
||||
}
|
||||
|
||||
namespace test_fold_expression
|
||||
{
|
||||
|
||||
template<typename... Args>
|
||||
int multiply(Args... args)
|
||||
{
|
||||
return (args * ... * 1);
|
||||
}
|
||||
|
||||
template<typename... Args>
|
||||
bool all(Args... args)
|
||||
{
|
||||
return (args && ...);
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
namespace test_extended_static_assert
|
||||
{
|
||||
|
||||
static_assert (true);
|
||||
|
||||
}
|
||||
|
||||
namespace test_auto_brace_init_list
|
||||
{
|
||||
|
||||
auto foo = {5};
|
||||
auto bar {5};
|
||||
|
||||
static_assert(std::is_same<std::initializer_list<int>, decltype(foo)>::value);
|
||||
static_assert(std::is_same<int, decltype(bar)>::value);
|
||||
}
|
||||
|
||||
namespace test_typename_in_template_template_parameter
|
||||
{
|
||||
|
||||
template<template<typename> typename X> struct D;
|
||||
|
||||
}
|
||||
|
||||
namespace test_fallthrough_nodiscard_maybe_unused_attributes
|
||||
{
|
||||
|
||||
int f1()
|
||||
{
|
||||
return 42;
|
||||
}
|
||||
|
||||
[[nodiscard]] int f2()
|
||||
{
|
||||
[[maybe_unused]] auto unused = f1();
|
||||
|
||||
switch (f1())
|
||||
{
|
||||
case 17:
|
||||
f1();
|
||||
[[fallthrough]];
|
||||
case 42:
|
||||
f1();
|
||||
}
|
||||
return f1();
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
namespace test_extended_aggregate_initialization
|
||||
{
|
||||
|
||||
struct base1
|
||||
{
|
||||
int b1, b2 = 42;
|
||||
};
|
||||
|
||||
struct base2
|
||||
{
|
||||
base2() {
|
||||
b3 = 42;
|
||||
}
|
||||
int b3;
|
||||
};
|
||||
|
||||
struct derived : base1, base2
|
||||
{
|
||||
int d;
|
||||
};
|
||||
|
||||
derived d1 {{1, 2}, {}, 4}; // full initialization
|
||||
derived d2 {{}, {}, 4}; // value-initialized bases
|
||||
|
||||
}
|
||||
|
||||
namespace test_general_range_based_for_loop
|
||||
{
|
||||
|
||||
struct iter
|
||||
{
|
||||
int i;
|
||||
|
||||
int& operator* ()
|
||||
{
|
||||
return i;
|
||||
}
|
||||
|
||||
const int& operator* () const
|
||||
{
|
||||
return i;
|
||||
}
|
||||
|
||||
iter& operator++()
|
||||
{
|
||||
++i;
|
||||
return *this;
|
||||
}
|
||||
};
|
||||
|
||||
struct sentinel
|
||||
{
|
||||
int i;
|
||||
};
|
||||
|
||||
bool operator== (const iter& i, const sentinel& s)
|
||||
{
|
||||
return i.i == s.i;
|
||||
}
|
||||
|
||||
bool operator!= (const iter& i, const sentinel& s)
|
||||
{
|
||||
return !(i == s);
|
||||
}
|
||||
|
||||
struct range
|
||||
{
|
||||
iter begin() const
|
||||
{
|
||||
return {0};
|
||||
}
|
||||
|
||||
sentinel end() const
|
||||
{
|
||||
return {5};
|
||||
}
|
||||
};
|
||||
|
||||
void f()
|
||||
{
|
||||
range r {};
|
||||
|
||||
for (auto i : r)
|
||||
{
|
||||
[[maybe_unused]] auto v = i;
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
namespace test_lambda_capture_asterisk_this_by_value
|
||||
{
|
||||
|
||||
struct t
|
||||
{
|
||||
int i;
|
||||
int foo()
|
||||
{
|
||||
return [*this]()
|
||||
{
|
||||
return i;
|
||||
}();
|
||||
}
|
||||
};
|
||||
|
||||
}
|
||||
|
||||
namespace test_enum_class_construction
|
||||
{
|
||||
|
||||
enum class byte : unsigned char
|
||||
{};
|
||||
|
||||
byte foo {42};
|
||||
|
||||
}
|
||||
|
||||
namespace test_constexpr_if
|
||||
{
|
||||
|
||||
template <bool cond>
|
||||
int f ()
|
||||
{
|
||||
if constexpr(cond)
|
||||
{
|
||||
return 13;
|
||||
}
|
||||
else
|
||||
{
|
||||
return 42;
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
namespace test_selection_statement_with_initializer
|
||||
{
|
||||
|
||||
int f()
|
||||
{
|
||||
return 13;
|
||||
}
|
||||
|
||||
int f2()
|
||||
{
|
||||
if (auto i = f(); i > 0)
|
||||
{
|
||||
return 3;
|
||||
}
|
||||
|
||||
switch (auto i = f(); i + 4)
|
||||
{
|
||||
case 17:
|
||||
return 2;
|
||||
|
||||
default:
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
namespace test_template_argument_deduction_for_class_templates
|
||||
{
|
||||
|
||||
template <typename T1, typename T2>
|
||||
struct pair
|
||||
{
|
||||
pair (T1 p1, T2 p2)
|
||||
: m1 {p1},
|
||||
m2 {p2}
|
||||
{}
|
||||
|
||||
T1 m1;
|
||||
T2 m2;
|
||||
};
|
||||
|
||||
void f()
|
||||
{
|
||||
[[maybe_unused]] auto p = pair{13, 42u};
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
namespace test_non_type_auto_template_parameters
|
||||
{
|
||||
|
||||
template <auto n>
|
||||
struct B
|
||||
{};
|
||||
|
||||
B<5> b1;
|
||||
B<'a'> b2;
|
||||
|
||||
}
|
||||
|
||||
namespace test_structured_bindings
|
||||
{
|
||||
|
||||
int arr[2] = { 1, 2 };
|
||||
std::pair<int, int> pr = { 1, 2 };
|
||||
|
||||
auto f1() -> int(&)[2]
|
||||
{
|
||||
return arr;
|
||||
}
|
||||
|
||||
auto f2() -> std::pair<int, int>&
|
||||
{
|
||||
return pr;
|
||||
}
|
||||
|
||||
struct S
|
||||
{
|
||||
int x1 : 2;
|
||||
volatile double y1;
|
||||
};
|
||||
|
||||
S f3()
|
||||
{
|
||||
return {};
|
||||
}
|
||||
|
||||
auto [ x1, y1 ] = f1();
|
||||
auto& [ xr1, yr1 ] = f1();
|
||||
auto [ x2, y2 ] = f2();
|
||||
auto& [ xr2, yr2 ] = f2();
|
||||
const auto [ x3, y3 ] = f3();
|
||||
|
||||
}
|
||||
|
||||
namespace test_exception_spec_type_system
|
||||
{
|
||||
|
||||
struct Good {};
|
||||
struct Bad {};
|
||||
|
||||
void g1() noexcept;
|
||||
void g2();
|
||||
|
||||
template<typename T>
|
||||
Bad
|
||||
f(T*, T*);
|
||||
|
||||
template<typename T1, typename T2>
|
||||
Good
|
||||
f(T1*, T2*);
|
||||
|
||||
static_assert (std::is_same_v<Good, decltype(f(g1, g2))>);
|
||||
|
||||
}
|
||||
|
||||
namespace test_inline_variables
|
||||
{
|
||||
|
||||
template<class T> void f(T)
|
||||
{}
|
||||
|
||||
template<class T> inline T g(T)
|
||||
{
|
||||
return T{};
|
||||
}
|
||||
|
||||
template<> inline void f<>(int)
|
||||
{}
|
||||
|
||||
template<> int g<>(int)
|
||||
{
|
||||
return 5;
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
} // namespace cxx17
|
||||
|
||||
#endif // __cplusplus < 201703L && !defined _MSC_VER
|
||||
|
||||
|
||||
|
||||
_ACEOF
|
||||
if ac_fn_cxx_try_compile "$LINENO"
|
||||
then :
|
||||
|
|
@ -8365,14 +8564,21 @@ else $as_nop
|
|||
eval $cachevar=no
|
||||
fi
|
||||
rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
|
||||
CXXFLAGS="$ac_save_CXXFLAGS"
|
||||
CXX="$ac_save_CXX"
|
||||
fi
|
||||
eval ac_res=\$$cachevar
|
||||
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
|
||||
printf "%s\n" "$ac_res" >&6; }
|
||||
if eval test x\$$cachevar = xyes; then
|
||||
CXXFLAGS="$CXXFLAGS $switch"
|
||||
ac_success=yes
|
||||
if eval test x\$$cachevar = xyes; then
|
||||
CXX="$CXX $switch"
|
||||
if test -n "$CXXCPP" ; then
|
||||
CXXCPP="$CXXCPP $switch"
|
||||
fi
|
||||
ac_success=yes
|
||||
break
|
||||
fi
|
||||
done
|
||||
if test x$ac_success = xyes; then
|
||||
break
|
||||
fi
|
||||
done
|
||||
|
|
@ -8383,26 +8589,24 @@ 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$ax_cxx_compile_cxx11_required = xtrue; then
|
||||
if test x$ax_cxx_compile_cxx17_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
|
||||
as_fn_error $? "*** A compiler with support for C++17 language features is required." "$LINENO" 5
|
||||
fi
|
||||
fi
|
||||
if test x$ac_success = xno; then
|
||||
HAVE_CXX17=0
|
||||
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: No compiler with C++17 support was found" >&5
|
||||
printf "%s\n" "$as_me: No compiler with C++17 support was found" >&6;}
|
||||
else
|
||||
if test x$ac_success = xno; then
|
||||
HAVE_CXX11=0
|
||||
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: No compiler with C++11 support was found" >&5
|
||||
printf "%s\n" "$as_me: No compiler with C++11 support was found" >&6;}
|
||||
else
|
||||
HAVE_CXX11=1
|
||||
|
||||
printf "%s\n" "#define HAVE_CXX11 1" >>confdefs.h
|
||||
|
||||
fi
|
||||
HAVE_CXX17=1
|
||||
|
||||
printf "%s\n" "#define HAVE_CXX17 1" >>confdefs.h
|
||||
|
||||
fi
|
||||
|
||||
|
||||
|
||||
WARN_CXXFLAGS=
|
||||
ac_ext=cpp
|
||||
ac_cpp='$CXXCPP $CPPFLAGS'
|
||||
|
|
|
|||
|
|
@ -75,7 +75,7 @@ AC_CHECK_FUNCS([arc4random getcontext getrandom memfd_create])
|
|||
AM_CONDITIONAL([HAVE_GETCONTEXT], [test "x$ac_cv_func_getcontext" = xyes])
|
||||
AM_CONDITIONAL([HAVE_MEMFD_CREATE], [test "x$ac_cv_func_memfd_create" = xyes])
|
||||
|
||||
AX_CXX_COMPILE_STDCXX(11, noext, mandatory)
|
||||
AX_CXX_COMPILE_STDCXX(17, noext, mandatory)
|
||||
|
||||
dnl Test supported warning flags.
|
||||
WARN_CXXFLAGS=
|
||||
|
|
|
|||
|
|
@ -1,5 +1,5 @@
|
|||
# ===========================================================================
|
||||
# http://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx.html
|
||||
# https://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx.html
|
||||
# ===========================================================================
|
||||
#
|
||||
# SYNOPSIS
|
||||
|
|
@ -9,14 +9,14 @@
|
|||
# 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).
|
||||
# version of the C++ standard. If necessary, add switches to CXX and
|
||||
# CXXCPP to enable support. VERSION may be '11', '14', '17', or '20' for
|
||||
# the respective C++ standard version.
|
||||
#
|
||||
# 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.
|
||||
# preference for no added switch, and then for an extended mode.
|
||||
#
|
||||
# The third argument, if specified 'mandatory' or if left unspecified,
|
||||
# indicates that baseline support for the specified C++ standard is
|
||||
|
|
@ -33,21 +33,26 @@
|
|||
# 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>
|
||||
# Copyright (c) 2016, 2018 Krzesimir Nowak <qdlacz@gmail.com>
|
||||
# Copyright (c) 2019 Enji Cooper <yaneurabeya@gmail.com>
|
||||
# Copyright (c) 2020 Jason Merrill <jason@redhat.com>
|
||||
# Copyright (c) 2021 Jörn Heusipp <osmanx@problemloesungsmaschine.de>
|
||||
#
|
||||
# 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
|
||||
#serial 15
|
||||
|
||||
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_if([$1], [11], [ax_cxx_compile_alternatives="11 0x"],
|
||||
[$1], [14], [ax_cxx_compile_alternatives="14 1y"],
|
||||
[$1], [17], [ax_cxx_compile_alternatives="17 1z"],
|
||||
[$1], [20], [ax_cxx_compile_alternatives="20"],
|
||||
[m4_fatal([invalid first argument `$1' to AX_CXX_COMPILE_STDCXX])])dnl
|
||||
m4_if([$2], [], [],
|
||||
[$2], [ext], [],
|
||||
|
|
@ -59,29 +64,35 @@ AC_DEFUN([AX_CXX_COMPILE_STDCXX], [dnl
|
|||
[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], [], [dnl
|
||||
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
|
||||
for alternative in ${ax_cxx_compile_alternatives}; do
|
||||
switch="-std=gnu++${alternative}"
|
||||
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 $switch"
|
||||
[ac_save_CXX="$CXX"
|
||||
CXX="$CXX $switch"
|
||||
AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
|
||||
[eval $cachevar=yes],
|
||||
[eval $cachevar=no])
|
||||
CXXFLAGS="$ac_save_CXXFLAGS"])
|
||||
CXX="$ac_save_CXX"])
|
||||
if eval test x\$$cachevar = xyes; then
|
||||
CXXFLAGS="$CXXFLAGS $switch"
|
||||
CXX="$CXX $switch"
|
||||
if test -n "$CXXCPP" ; then
|
||||
CXXCPP="$CXXCPP $switch"
|
||||
fi
|
||||
ac_success=yes
|
||||
break
|
||||
fi
|
||||
|
|
@ -93,19 +104,27 @@ AC_DEFUN([AX_CXX_COMPILE_STDCXX], [dnl
|
|||
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
|
||||
for alternative in ${ax_cxx_compile_alternatives}; do
|
||||
for switch in -std=c++${alternative} +std=c++${alternative} "-h std=c++${alternative}"; do
|
||||
cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_$switch])
|
||||
AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch,
|
||||
$cachevar,
|
||||
[ac_save_CXX="$CXX"
|
||||
CXX="$CXX $switch"
|
||||
AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
|
||||
[eval $cachevar=yes],
|
||||
[eval $cachevar=no])
|
||||
CXX="$ac_save_CXX"])
|
||||
if eval test x\$$cachevar = xyes; then
|
||||
CXX="$CXX $switch"
|
||||
if test -n "$CXXCPP" ; then
|
||||
CXXCPP="$CXXCPP $switch"
|
||||
fi
|
||||
ac_success=yes
|
||||
break
|
||||
fi
|
||||
done
|
||||
if test x$ac_success = xyes; then
|
||||
break
|
||||
fi
|
||||
done
|
||||
|
|
@ -115,18 +134,16 @@ AC_DEFUN([AX_CXX_COMPILE_STDCXX], [dnl
|
|||
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$1)
|
||||
fi
|
||||
if test x$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)
|
||||
])
|
||||
|
||||
|
||||
|
|
@ -136,7 +153,6 @@ 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],
|
||||
|
|
@ -144,6 +160,23 @@ m4_define([_AX_CXX_COMPILE_STDCXX_testbody_14],
|
|||
_AX_CXX_COMPILE_STDCXX_testbody_new_in_14
|
||||
)
|
||||
|
||||
dnl Test body for checking C++17 support
|
||||
|
||||
m4_define([_AX_CXX_COMPILE_STDCXX_testbody_17],
|
||||
_AX_CXX_COMPILE_STDCXX_testbody_new_in_11
|
||||
_AX_CXX_COMPILE_STDCXX_testbody_new_in_14
|
||||
_AX_CXX_COMPILE_STDCXX_testbody_new_in_17
|
||||
)
|
||||
|
||||
dnl Test body for checking C++20 support
|
||||
|
||||
m4_define([_AX_CXX_COMPILE_STDCXX_testbody_20],
|
||||
_AX_CXX_COMPILE_STDCXX_testbody_new_in_11
|
||||
_AX_CXX_COMPILE_STDCXX_testbody_new_in_14
|
||||
_AX_CXX_COMPILE_STDCXX_testbody_new_in_17
|
||||
_AX_CXX_COMPILE_STDCXX_testbody_new_in_20
|
||||
)
|
||||
|
||||
|
||||
dnl Tests for new features in C++11
|
||||
|
||||
|
|
@ -156,7 +189,11 @@ m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_11], [[
|
|||
|
||||
#error "This is not a C++ compiler"
|
||||
|
||||
#elif __cplusplus < 201103L
|
||||
// MSVC always sets __cplusplus to 199711L in older versions; newer versions
|
||||
// only set it correctly if /Zc:__cplusplus is specified as well as a
|
||||
// /std:c++NN switch:
|
||||
// https://devblogs.microsoft.com/cppblog/msvc-now-correctly-reports-__cplusplus/
|
||||
#elif __cplusplus < 201103L && !defined _MSC_VER
|
||||
|
||||
#error "This is not a C++11 compiler"
|
||||
|
||||
|
|
@ -181,11 +218,13 @@ namespace cxx11
|
|||
|
||||
struct Base
|
||||
{
|
||||
virtual ~Base() {}
|
||||
virtual void f() {}
|
||||
};
|
||||
|
||||
struct Derived : public Base
|
||||
{
|
||||
virtual ~Derived() override {}
|
||||
virtual void f() override {}
|
||||
};
|
||||
|
||||
|
|
@ -445,7 +484,7 @@ m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_14], [[
|
|||
|
||||
#error "This is not a C++ compiler"
|
||||
|
||||
#elif __cplusplus < 201402L
|
||||
#elif __cplusplus < 201402L && !defined _MSC_VER
|
||||
|
||||
#error "This is not a C++14 compiler"
|
||||
|
||||
|
|
@ -514,7 +553,7 @@ namespace cxx14
|
|||
|
||||
}
|
||||
|
||||
namespace test_digit_seperators
|
||||
namespace test_digit_separators
|
||||
{
|
||||
|
||||
constexpr auto ten_million = 100'000'000;
|
||||
|
|
@ -556,3 +595,415 @@ namespace cxx14
|
|||
#endif // __cplusplus >= 201402L
|
||||
|
||||
]])
|
||||
|
||||
|
||||
dnl Tests for new features in C++17
|
||||
|
||||
m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_17], [[
|
||||
|
||||
// If the compiler admits that it is not ready for C++17, why torture it?
|
||||
// Hopefully, this will speed up the test.
|
||||
|
||||
#ifndef __cplusplus
|
||||
|
||||
#error "This is not a C++ compiler"
|
||||
|
||||
#elif __cplusplus < 201703L && !defined _MSC_VER
|
||||
|
||||
#error "This is not a C++17 compiler"
|
||||
|
||||
#else
|
||||
|
||||
#include <initializer_list>
|
||||
#include <utility>
|
||||
#include <type_traits>
|
||||
|
||||
namespace cxx17
|
||||
{
|
||||
|
||||
namespace test_constexpr_lambdas
|
||||
{
|
||||
|
||||
constexpr int foo = [](){return 42;}();
|
||||
|
||||
}
|
||||
|
||||
namespace test::nested_namespace::definitions
|
||||
{
|
||||
|
||||
}
|
||||
|
||||
namespace test_fold_expression
|
||||
{
|
||||
|
||||
template<typename... Args>
|
||||
int multiply(Args... args)
|
||||
{
|
||||
return (args * ... * 1);
|
||||
}
|
||||
|
||||
template<typename... Args>
|
||||
bool all(Args... args)
|
||||
{
|
||||
return (args && ...);
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
namespace test_extended_static_assert
|
||||
{
|
||||
|
||||
static_assert (true);
|
||||
|
||||
}
|
||||
|
||||
namespace test_auto_brace_init_list
|
||||
{
|
||||
|
||||
auto foo = {5};
|
||||
auto bar {5};
|
||||
|
||||
static_assert(std::is_same<std::initializer_list<int>, decltype(foo)>::value);
|
||||
static_assert(std::is_same<int, decltype(bar)>::value);
|
||||
}
|
||||
|
||||
namespace test_typename_in_template_template_parameter
|
||||
{
|
||||
|
||||
template<template<typename> typename X> struct D;
|
||||
|
||||
}
|
||||
|
||||
namespace test_fallthrough_nodiscard_maybe_unused_attributes
|
||||
{
|
||||
|
||||
int f1()
|
||||
{
|
||||
return 42;
|
||||
}
|
||||
|
||||
[[nodiscard]] int f2()
|
||||
{
|
||||
[[maybe_unused]] auto unused = f1();
|
||||
|
||||
switch (f1())
|
||||
{
|
||||
case 17:
|
||||
f1();
|
||||
[[fallthrough]];
|
||||
case 42:
|
||||
f1();
|
||||
}
|
||||
return f1();
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
namespace test_extended_aggregate_initialization
|
||||
{
|
||||
|
||||
struct base1
|
||||
{
|
||||
int b1, b2 = 42;
|
||||
};
|
||||
|
||||
struct base2
|
||||
{
|
||||
base2() {
|
||||
b3 = 42;
|
||||
}
|
||||
int b3;
|
||||
};
|
||||
|
||||
struct derived : base1, base2
|
||||
{
|
||||
int d;
|
||||
};
|
||||
|
||||
derived d1 {{1, 2}, {}, 4}; // full initialization
|
||||
derived d2 {{}, {}, 4}; // value-initialized bases
|
||||
|
||||
}
|
||||
|
||||
namespace test_general_range_based_for_loop
|
||||
{
|
||||
|
||||
struct iter
|
||||
{
|
||||
int i;
|
||||
|
||||
int& operator* ()
|
||||
{
|
||||
return i;
|
||||
}
|
||||
|
||||
const int& operator* () const
|
||||
{
|
||||
return i;
|
||||
}
|
||||
|
||||
iter& operator++()
|
||||
{
|
||||
++i;
|
||||
return *this;
|
||||
}
|
||||
};
|
||||
|
||||
struct sentinel
|
||||
{
|
||||
int i;
|
||||
};
|
||||
|
||||
bool operator== (const iter& i, const sentinel& s)
|
||||
{
|
||||
return i.i == s.i;
|
||||
}
|
||||
|
||||
bool operator!= (const iter& i, const sentinel& s)
|
||||
{
|
||||
return !(i == s);
|
||||
}
|
||||
|
||||
struct range
|
||||
{
|
||||
iter begin() const
|
||||
{
|
||||
return {0};
|
||||
}
|
||||
|
||||
sentinel end() const
|
||||
{
|
||||
return {5};
|
||||
}
|
||||
};
|
||||
|
||||
void f()
|
||||
{
|
||||
range r {};
|
||||
|
||||
for (auto i : r)
|
||||
{
|
||||
[[maybe_unused]] auto v = i;
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
namespace test_lambda_capture_asterisk_this_by_value
|
||||
{
|
||||
|
||||
struct t
|
||||
{
|
||||
int i;
|
||||
int foo()
|
||||
{
|
||||
return [*this]()
|
||||
{
|
||||
return i;
|
||||
}();
|
||||
}
|
||||
};
|
||||
|
||||
}
|
||||
|
||||
namespace test_enum_class_construction
|
||||
{
|
||||
|
||||
enum class byte : unsigned char
|
||||
{};
|
||||
|
||||
byte foo {42};
|
||||
|
||||
}
|
||||
|
||||
namespace test_constexpr_if
|
||||
{
|
||||
|
||||
template <bool cond>
|
||||
int f ()
|
||||
{
|
||||
if constexpr(cond)
|
||||
{
|
||||
return 13;
|
||||
}
|
||||
else
|
||||
{
|
||||
return 42;
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
namespace test_selection_statement_with_initializer
|
||||
{
|
||||
|
||||
int f()
|
||||
{
|
||||
return 13;
|
||||
}
|
||||
|
||||
int f2()
|
||||
{
|
||||
if (auto i = f(); i > 0)
|
||||
{
|
||||
return 3;
|
||||
}
|
||||
|
||||
switch (auto i = f(); i + 4)
|
||||
{
|
||||
case 17:
|
||||
return 2;
|
||||
|
||||
default:
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
namespace test_template_argument_deduction_for_class_templates
|
||||
{
|
||||
|
||||
template <typename T1, typename T2>
|
||||
struct pair
|
||||
{
|
||||
pair (T1 p1, T2 p2)
|
||||
: m1 {p1},
|
||||
m2 {p2}
|
||||
{}
|
||||
|
||||
T1 m1;
|
||||
T2 m2;
|
||||
};
|
||||
|
||||
void f()
|
||||
{
|
||||
[[maybe_unused]] auto p = pair{13, 42u};
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
namespace test_non_type_auto_template_parameters
|
||||
{
|
||||
|
||||
template <auto n>
|
||||
struct B
|
||||
{};
|
||||
|
||||
B<5> b1;
|
||||
B<'a'> b2;
|
||||
|
||||
}
|
||||
|
||||
namespace test_structured_bindings
|
||||
{
|
||||
|
||||
int arr[2] = { 1, 2 };
|
||||
std::pair<int, int> pr = { 1, 2 };
|
||||
|
||||
auto f1() -> int(&)[2]
|
||||
{
|
||||
return arr;
|
||||
}
|
||||
|
||||
auto f2() -> std::pair<int, int>&
|
||||
{
|
||||
return pr;
|
||||
}
|
||||
|
||||
struct S
|
||||
{
|
||||
int x1 : 2;
|
||||
volatile double y1;
|
||||
};
|
||||
|
||||
S f3()
|
||||
{
|
||||
return {};
|
||||
}
|
||||
|
||||
auto [ x1, y1 ] = f1();
|
||||
auto& [ xr1, yr1 ] = f1();
|
||||
auto [ x2, y2 ] = f2();
|
||||
auto& [ xr2, yr2 ] = f2();
|
||||
const auto [ x3, y3 ] = f3();
|
||||
|
||||
}
|
||||
|
||||
namespace test_exception_spec_type_system
|
||||
{
|
||||
|
||||
struct Good {};
|
||||
struct Bad {};
|
||||
|
||||
void g1() noexcept;
|
||||
void g2();
|
||||
|
||||
template<typename T>
|
||||
Bad
|
||||
f(T*, T*);
|
||||
|
||||
template<typename T1, typename T2>
|
||||
Good
|
||||
f(T1*, T2*);
|
||||
|
||||
static_assert (std::is_same_v<Good, decltype(f(g1, g2))>);
|
||||
|
||||
}
|
||||
|
||||
namespace test_inline_variables
|
||||
{
|
||||
|
||||
template<class T> void f(T)
|
||||
{}
|
||||
|
||||
template<class T> inline T g(T)
|
||||
{
|
||||
return T{};
|
||||
}
|
||||
|
||||
template<> inline void f<>(int)
|
||||
{}
|
||||
|
||||
template<> int g<>(int)
|
||||
{
|
||||
return 5;
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
} // namespace cxx17
|
||||
|
||||
#endif // __cplusplus < 201703L && !defined _MSC_VER
|
||||
|
||||
]])
|
||||
|
||||
|
||||
dnl Tests for new features in C++20
|
||||
|
||||
m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_20], [[
|
||||
|
||||
#ifndef __cplusplus
|
||||
|
||||
#error "This is not a C++ compiler"
|
||||
|
||||
#elif __cplusplus < 202002L && !defined _MSC_VER
|
||||
|
||||
#error "This is not a C++20 compiler"
|
||||
|
||||
#else
|
||||
|
||||
#include <version>
|
||||
|
||||
namespace cxx20
|
||||
{
|
||||
|
||||
// As C++20 supports feature test macros in the standard, there is no
|
||||
// immediate need to actually test for feature availability on the
|
||||
// Autoconf side.
|
||||
|
||||
} // namespace cxx20
|
||||
|
||||
#endif // __cplusplus < 202002L && !defined _MSC_VER
|
||||
|
||||
]])
|
||||
|
|
|
|||
|
|
@ -6,8 +6,8 @@
|
|||
/* Define to 1 if you have the <a.out.h> header file. */
|
||||
#undef HAVE_A_OUT_H
|
||||
|
||||
/* define if the compiler supports basic C++11 syntax */
|
||||
#undef HAVE_CXX11
|
||||
/* define if the compiler supports basic C++17 syntax */
|
||||
#undef HAVE_CXX17
|
||||
|
||||
/* Define to 1 if you have the `getcontext' function. */
|
||||
#undef HAVE_GETCONTEXT
|
||||
|
|
|
|||
Loading…
Reference in a new issue