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build: strengthen the C++ standard flag test

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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
2018-09-16 18:20:56 +02:00
parent 8da0cef821
commit 3367d8dd5c
5 changed files with 262 additions and 16 deletions
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10
tests/local.at
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@@ -565,9 +565,15 @@ main (int argc, char const* argv[])
m4_define([AT_FOR_EACH_CXX],
[[at_for_each_cxx_CXXFLAGS_save=$CXXFLAGS
for at_cxx_std in "" $STDCXX_FLAGS
for at_cxx_std in '' \
${CXX98_CXXFLAGS:+"$CXX98_CXXFLAGS"} \
${CXX03_CXXFLAGS:+"$CXX03_CXXFLAGS"} \
${CXX11_CXXFLAGS:+"$CXX11_CXXFLAGS"} \
${CXX14_CXXFLAGS:+"$CXX14_CXXFLAGS"} \
${CXX17_CXXFLAGS:+"$CXX17_CXXFLAGS"} \
${CXX2A_CXXFLAGS:+"$CXX2A_CXXFLAGS"}
do
]AS_ECHO(["Testing with C++ standard flags: '$at_cxx_std'"])[
]AS_ECHO(["======== Testing with C++ standard flags: '$at_cxx_std'"])[
CXXFLAGS="$at_for_each_cxx_CXXFLAGS_save $at_cxx_std"
]$1[
done