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| author | Akim Demaille <akim.demaille@gmail.com> | 2018-09-16 18:20:56 +0200 |
|---|---|---|
| committer | Akim Demaille <akim.demaille@gmail.com> | 2018-09-18 13:21:38 +0200 |
| commit | 3367d8dd5c9fdc53dc7c4c7961a6aee2187f34a4 (patch) | |
| tree | 3500638e8f8bc121afec6b8ab83f1a450909b2be /configure.ac | |
| parent | 8da0cef821c10d27ec1966b162cebbcba45ef6de (diff) | |
| download | bison-3367d8dd5c9fdc53dc7c4c7961a6aee2187f34a4.tar.gz | |
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.
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 26 |
1 files changed, 13 insertions, 13 deletions
diff --git a/configure.ac b/configure.ac index f8faa2b7..2a4269cc 100644 --- a/configure.ac +++ b/configure.ac @@ -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 |