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36f37568ba
Reported by Dagobert Michelsen. https://lists.gnu.org/r/bug-bison/2021-08/msg00006.html * m4/bison-cxx-std.m4 (_BISON_CXXSTD_98_snippet): We don't need vector::data, it was only for glr2.cc, which is C++11 anyway. (_BISON_CXXSTD_11_snippet): We need vector::data and std::swap on arrays. * m4/cxx.m4 (BISON_TEST_FOR_WORKING_CXX_COMPILER): We don't need vector::data. * tests/local.at (AT_COMPILE_CXX): Skip when glr2.cc and no support for C++11.
196 lines
4.2 KiB
Plaintext
196 lines
4.2 KiB
Plaintext
# bison-cxx-std.m4 serial 1
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# Copyright (C) 2018-2021 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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[[]])
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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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[[ // C++11
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#include <algorithm>
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#include <cassert>
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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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#include <utility> // std::swap
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#include <vector>
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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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// Needed by glr2.cc.
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void cxx11_vector_data ()
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{
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std::vector<int> ints;
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ints.emplace_back (42);
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assert (ints.data () == &ints[0]);
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}
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// Needed by glr2.cc.
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void cxx11_array_swap ()
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{
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int i0[4] = { 1, 2, 3, 4 };
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int i1[4] = { 5, 6, 7, 8 };
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std::swap (i0, i1);
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}
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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_20_snippet],
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[[ // C++20
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]])
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m4_define([_BISON_CXXSTD_2B_snippet],
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[[ // C++2B
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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(20)],
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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_20_snippet
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])])
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m4_define([_BISON_CXXSTD_testbody(2b)],
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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_20_snippet
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_BISON_CXXSTD_2B_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 supports STD (11, 98, 2b, 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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