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9114b267a8
Reported by Bruno Haible. http://lists.gnu.org/archive/html/bug-bison/2019-05/msg00033.html * m4/bison-cxx-std.m4 (_BISON_CXXSTD_11_snippet): Check it.
165 lines
3.6 KiB
Plaintext
165 lines
3.6 KiB
Plaintext
# bison-cxx-std.m4 serial 1
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# Copyright (C) 2018 Free Software Foundation, # Inc.
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# This file is free software; the Free Software Foundation
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# gives unlimited permission to copy and/or distribute it,
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# with or without modifications, as long as this notice is preserved.
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m4_define([_BISON_CXXSTD_98_snippet],
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[#include <vector>
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typedef std::vector<int> ints;
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])
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m4_define([_BISON_CXXSTD_03_snippet],
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[])
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m4_define([_BISON_CXXSTD_11_snippet],
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[#include <algorithm>
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#include <memory>
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#include <set>
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#include <sstream>
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#include <string>
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// C++11
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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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using right_angle_brackets = check<check<bool>>;
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auto f = std::make_shared<std::string>("shared_ptr");
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int a;
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decltype(a) b;
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typedef check<int> check_type;
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check_type c;
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check_type&& cr = static_cast<check_type&&>(c);
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auto d = a;
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// Some versions of libstdc++ do not support std::set::emplace.
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void foo()
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{
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std::set<int> is;
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is.emplace(42);
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}
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// Clang++ 3.5, for a while, was unable to process properly
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// the for-loop because its variable, r, is a typedef...
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// It failed as follows:
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//
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// error: unexpected ':' in nested name specifier; did you mean '::'?
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// for (auto r: std::set<int>{1, 2})
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// ^
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// ::
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using r = std::set<int>;
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void bar()
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{
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for (int r: std::set<int>{1, 2})
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continue;
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}
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// GCC 4.8.2 on Solaris 11.3 does not support to_string.
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auto e = std::to_string(42);
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])
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m4_define([_BISON_CXXSTD_14_snippet],
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[ // C++14
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void mismatch()
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{
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using ints = std::vector<int>;
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auto v1 = ints{1, 2, 3};
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auto v2 = ints{1, 2};
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std::mismatch(std::begin(v1), std::end(v1),
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std::begin(v2), std::end(v2));
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}
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])
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m4_define([_BISON_CXXSTD_17_snippet],
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[ // C++17
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namespace ns1::ns2::ns3 {}
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#include <optional>
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auto opt_string = std::optional<std::string>{};
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auto out = std::ostringstream{};
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])
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m4_define([_BISON_CXXSTD_2A_snippet],
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[ // C++2A
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])
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m4_define([_BISON_CXXSTD_testbody(98)],
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[AC_LANG_PROGRAM([
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_BISON_CXXSTD_98_snippet
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])])
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m4_define([_BISON_CXXSTD_testbody(03)],
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[AC_LANG_PROGRAM([
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_BISON_CXXSTD_98_snippet
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_BISON_CXXSTD_03_snippet
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])])
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m4_define([_BISON_CXXSTD_testbody(11)],
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[AC_LANG_PROGRAM([
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_BISON_CXXSTD_98_snippet
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_BISON_CXXSTD_03_snippet
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_BISON_CXXSTD_11_snippet
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])])
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m4_define([_BISON_CXXSTD_testbody(14)],
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[AC_LANG_PROGRAM([
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_BISON_CXXSTD_98_snippet
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_BISON_CXXSTD_03_snippet
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_BISON_CXXSTD_11_snippet
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_BISON_CXXSTD_14_snippet
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])])
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m4_define([_BISON_CXXSTD_testbody(17)],
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[AC_LANG_PROGRAM([
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_BISON_CXXSTD_98_snippet
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_BISON_CXXSTD_03_snippet
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_BISON_CXXSTD_11_snippet
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_BISON_CXXSTD_14_snippet
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_BISON_CXXSTD_17_snippet
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])])
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m4_define([_BISON_CXXSTD_testbody(2a)],
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[AC_LANG_PROGRAM([
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_BISON_CXXSTD_98_snippet
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_BISON_CXXSTD_03_snippet
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_BISON_CXXSTD_11_snippet
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_BISON_CXXSTD_14_snippet
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_BISON_CXXSTD_17_snippet
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_BISON_CXXSTD_2A_snippet
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])])
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m4_define([_BISON_CXXSTD_testbody],
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[m4_ifdef([$0($1)],
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[m4_indir([$0($1)], m4_shift2($@))],
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[m4_fatal([$0: unknown C++ standard: $1])])])
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# BISON_CXXSTD(STD)
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# -----------------
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# Check whether the C++ compiler support STD (11, 98, 2a, etc.).
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# If it does, AC_SUBST 'CXX<STD>_CXXFLAGS' to the corresponding flags.
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AC_DEFUN([BISON_CXXSTD],
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[AC_REQUIRE([AC_PROG_CXX])
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AC_LANG_PUSH([C++])
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for f in '-std=c++$1' '-std=c++$1 -stdlib=libc++'
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do
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BISON_CHECK_COMPILER_FLAG([$f],
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[AC_SUBST(m4_toupper([CXX$1_CXXFLAGS]), [$f]) break],
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[], [],
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[_BISON_CXXSTD_testbody($1)])
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done
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AC_LANG_POP([C++])
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])
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