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Diffstat (limited to 'm4/ax_cxx_compile_stdcxx.m4')
| -rw-r--r-- | m4/ax_cxx_compile_stdcxx.m4 | 951 |
1 files changed, 0 insertions, 951 deletions
diff --git a/m4/ax_cxx_compile_stdcxx.m4 b/m4/ax_cxx_compile_stdcxx.m4 deleted file mode 100644 index 43087b2e6..000000000 --- a/m4/ax_cxx_compile_stdcxx.m4 +++ /dev/null @@ -1,951 +0,0 @@ -# =========================================================================== -# https://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 CXX and -# CXXCPP 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> -# Copyright (c) 2016, 2018 Krzesimir Nowak <qdlacz@gmail.com> -# Copyright (c) 2019 Enji Cooper <yaneurabeya@gmail.com> -# -# 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 11 - -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], [ax_cxx_compile_alternatives="11 0x"], - [$1], [14], [ax_cxx_compile_alternatives="14 1y"], - [$1], [17], [ax_cxx_compile_alternatives="17 1z"], - [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 - - m4_if([$2], [noext], [], [dnl - if test x$ac_success = xno; then - 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, - $cachevar, - [ac_save_CXX="$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 - 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 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 - 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++$1 language features is required.]) - fi - fi - if test x$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) -]) - - -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 -) - -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 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 ~Base() {} - virtual void f() {} - }; - - struct Derived : public Base - { - virtual ~Derived() override {} - 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_separators - { - - 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 - -]]) - - -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 - -#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 - -]]) |