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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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26
configure.ac
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@@ -21,7 +21,8 @@
# better to avoid a typo in the 'configure --help' entry for the YACC
# environment variable.
AC_PREREQ([2.68])
m4_pattern_forbid([^gl_[A-Z]])
m4_pattern_forbid([^_?(gl_[A-Z]|BISON_)])
m4_pattern_allow([^BISON_USE_NLS$])
AC_INIT([GNU Bison],
m4_esyscmd([build-aux/git-version-gen .tarball-version]),
@@ -52,18 +53,6 @@ AC_CONFIG_HEADERS([lib/config.h:lib/config.in.h])
# Checks for the compiler.
AC_PROG_CC_STDC
AC_PROG_CXX
AC_LANG_PUSH([C++])
gl_WARN_ADD([-fno-exceptions], [NO_EXCEPTIONS_CXXFLAGS])
gl_WARN_ADD([-std=c++98], [CXX98_CXXFLAGS])
gl_WARN_ADD([-std=c++03], [CXX03_CXXFLAGS])
gl_WARN_ADD([-std=c++11], [CXX11_CXXFLAGS])
gl_WARN_ADD([-std=c++14], [CXX14_CXXFLAGS])
gl_WARN_ADD([-std=c++17], [CXX17_CXXFLAGS])
gl_WARN_ADD([-std=c++2a], [CXX2A_CXXFLAGS])
AC_SUBST([STDCXX_FLAGS],
["$CXX98_CXXFLAGS $CXX03_CXXFLAGS $CXX11_CXXFLAGS $CXX14_CXXFLAGS $CXX17_CXXFLAGS $CXX2A_CXXFLAGS "])
AM_CONDITIONAL([ENABLE_CXX11], [test x"$CXX11_CXXFLAGS" != x])
AC_LANG_POP([C++])
# Gnulib (early checks).
gl_EARLY
@@ -82,6 +71,17 @@ AC_CACHE_CHECK([whether pragma GCC diagnostic push works],
[lv_cv_gcc_pragma_push_works=no])
CFLAGS=$save_CFLAGS])
AC_LANG_PUSH([C++])
gl_WARN_ADD([-fno-exceptions], [NO_EXCEPTIONS_CXXFLAGS])
gl_WARN_ADD([-std=c++98], [CXX98_CXXFLAGS])
gl_WARN_ADD([-std=c++03], [CXX03_CXXFLAGS])
BISON_CXX_COMPILE_STDCXX_11
BISON_CXX_COMPILE_STDCXX_14
BISON_CXX_COMPILE_STDCXX_17
BISON_CXX_COMPILE_STDCXX_2A
AM_CONDITIONAL([ENABLE_CXX11], [test x"$CXX11_CXXFLAGS" != x])
AC_LANG_POP([C++])
AC_ARG_ENABLE([gcc-warnings],
[ --enable-gcc-warnings turn on lots of GCC warnings (not recommended).
Also, issue synclines from the examples/ to