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build: strengthen the C++ standard flag test
On the CI, we have this spurious failure with clang 3.9 with
-std=c++17:
In file included from list.y:23:
In file included from /usr/include/c++/4.8/iostream:39:
In file included from /usr/include/c++/4.8/ostream:38:
In file included from /usr/include/c++/4.8/ios:42:
In file included from /usr/include/c++/4.8/bits/ios_base.h:41:
In file included from /usr/include/c++/4.8/bits/locale_classes.h:40:
In file included from /usr/include/c++/4.8/string:52:
In file included from /usr/include/c++/4.8/bits/basic_string.h:2815:
In file included from /usr/include/c++/4.8/ext/string_conversions.h:43:
/usr/include/c++/4.8/cstdio:120:11: error: no member named 'gets' in the global namespace
using ::gets;
~~^
This shows that our test, based on gl_WARN_ADD, is a joke. We have to
really check for at least a bit of C++.
* m4/ax_check_compile_flag.m4, m4/bison-cxx-std.m4: New.
* configure.ac: Use them to make sure the compiler actually works.
This commit is contained in:
Akim Demaille
70
m4/ax_check_compile_flag.m4
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70
m4/ax_check_compile_flag.m4
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@@ -0,0 +1,70 @@
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# ===========================================================================
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# http://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS])
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#
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# DESCRIPTION
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#
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# Check whether the given FLAG works with the current language's compiler
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# or gives an error. (Warnings, however, are ignored)
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#
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# ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
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# success/failure.
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#
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# If EXTRA-FLAGS is defined, it is added to the current language's default
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# flags (e.g. CFLAGS) when the check is done. The check is thus made with
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# the flags: "CFLAGS EXTRA-FLAGS FLAG". This can for example be used to
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# force the compiler to issue an error when a bad flag is given.
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#
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# NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
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# macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG.
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#
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# LICENSE
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#
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# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
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# Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
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#
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# This program is free software: you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the
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# Free Software Foundation, either version 3 of the License, or (at your
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# option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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# Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# As a special exception, the respective Autoconf Macro's copyright owner
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# gives unlimited permission to copy, distribute and modify the configure
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# scripts that are the output of Autoconf when processing the Macro. You
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# need not follow the terms of the GNU General Public License when using
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# or distributing such scripts, even though portions of the text of the
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# Macro appear in them. The GNU General Public License (GPL) does govern
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# all other use of the material that constitutes the Autoconf Macro.
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#
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# This special exception to the GPL applies to versions of the Autoconf
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# Macro released by the Autoconf Archive. When you make and distribute a
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# modified version of the Autoconf Macro, you may extend this special
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# exception to the GPL to apply to your modified version as well.
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#serial 2
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AC_DEFUN([AX_CHECK_COMPILE_FLAG],
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[AC_PREREQ(2.59)dnl for _AC_LANG_PREFIX
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AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
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AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
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ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
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_AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
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AC_COMPILE_IFELSE([m4_default([$5], [AC_LANG_PROGRAM()])],
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[AS_VAR_SET(CACHEVAR,[yes])],
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[AS_VAR_SET(CACHEVAR,[no])])
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_AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
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AS_IF([test x"AS_VAR_GET(CACHEVAR)" = xyes], [$2], [$3])
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AS_VAR_POPDEF([CACHEVAR])dnl
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])dnl AX_CHECK_COMPILE_FLAGS
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167
m4/bison-cxx-std.m4
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167
m4/bison-cxx-std.m4
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@@ -0,0 +1,167 @@
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# 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_CXX_COMPILE_STDCXX_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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#include <vector>
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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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])
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m4_define([_BISON_CXX_COMPILE_STDCXX_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_CXX_COMPILE_STDCXX_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_CXX_COMPILE_STDCXX_2A_snippet],
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[ // C++2A
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])
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m4_define([_BISON_CXX_COMPILE_STDCXX_11_testbody],
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[AC_LANG_SOURCE([
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_BISON_CXX_COMPILE_STDCXX_11_snippet
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])])
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m4_define([_BISON_CXX_COMPILE_STDCXX_14_testbody],
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[AC_LANG_SOURCE([
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_BISON_CXX_COMPILE_STDCXX_11_snippet
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_BISON_CXX_COMPILE_STDCXX_14_snippet
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])])
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m4_define([_BISON_CXX_COMPILE_STDCXX_17_testbody],
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[AC_LANG_SOURCE([
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_BISON_CXX_COMPILE_STDCXX_11_snippet
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_BISON_CXX_COMPILE_STDCXX_14_snippet
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_BISON_CXX_COMPILE_STDCXX_17_snippet
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])])
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m4_define([_BISON_CXX_COMPILE_STDCXX_2A_testbody],
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[AC_LANG_SOURCE([
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_BISON_CXX_COMPILE_STDCXX_11_snippet
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_BISON_CXX_COMPILE_STDCXX_14_snippet
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_BISON_CXX_COMPILE_STDCXX_17_snippet
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_BISON_CXX_COMPILE_STDCXX_2A_snippet
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])])
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AC_DEFUN([BISON_CXX_COMPILE_STDCXX_11],
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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++11' '-std=c++11 -stdlib=libc++'
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do
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AX_CHECK_COMPILE_FLAG([$f],
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[AC_SUBST([CXX11_CXXFLAGS], [$f]) break],
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[], [],
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[_BISON_CXX_COMPILE_STDCXX_11_testbody])
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done
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AC_LANG_POP([C++])
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])
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AC_DEFUN([BISON_CXX_COMPILE_STDCXX_14],
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[AC_REQUIRE([AC_PROG_CXX])
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AC_LANG_PUSH([C++])
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for f in '-std=c++14' '-std=c++14 -stdlib=libc++'
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do
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AX_CHECK_COMPILE_FLAG([$f],
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[AC_SUBST([CXX14_CXXFLAGS], [$f]) break],
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[], [],
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[_BISON_CXX_COMPILE_STDCXX_14_testbody])
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done
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AC_LANG_POP([C++])
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])
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AC_DEFUN([BISON_CXX_COMPILE_STDCXX_17],
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[AC_REQUIRE([AC_PROG_CXX])
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AC_LANG_PUSH([C++])
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for f in '-std=c++17' '-std=c++17 -stdlib=libc++'
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do
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AX_CHECK_COMPILE_FLAG([$f],
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[AC_SUBST([CXX17_CXXFLAGS], [$f]) break],
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[], [],
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[_BISON_CXX_COMPILE_STDCXX_17_testbody])
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done
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AC_LANG_POP([C++])
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])
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AC_DEFUN([BISON_CXX_COMPILE_STDCXX_2A],
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[AC_REQUIRE([AC_PROG_CXX])
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AC_LANG_PUSH([C++])
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for f in '-std=c++2a' '-std=c++2a -stdlib=libc++'
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do
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AX_CHECK_COMPILE_FLAG([$f],
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[AC_SUBST([CXX2A_CXXFLAGS], [$f]) break],
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[], [],
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[_BISON_CXX_COMPILE_STDCXX_2A_testbody])
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done
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AC_LANG_POP([C++])
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])
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