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| author | Akim Demaille <akim.demaille@gmail.com> | 2019-11-30 09:23:35 +0100 |
|---|---|---|
| committer | Akim Demaille <akim.demaille@gmail.com> | 2019-12-06 08:27:55 +0100 |
| commit | f8d82ff03900c109efb57634299d7d180ce60987 (patch) | |
| tree | 2b3a125b22ed6faa1e3823f10420092587fc95d3 /configure.ac | |
| parent | 9e9e49224fb4a7fae7b98205e1165fbfcea2453f (diff) | |
| download | bison-f8d82ff03900c109efb57634299d7d180ce60987.tar.gz | |
warnings: enable -Wuseless-cast, and eliminate warnings
Prompted by Frank Heckenbach.
https://lists.gnu.org/archive/html/bug-bison/2019-11/msg00016.html.
* configure.ac (warn_cxx): Add -Wuseless-cast.
* data/skeletons/c.m4 (b4_attribute_define): Define
YY_IGNORE_USELESS_CAST_BEGIN and YY_IGNORE_USELESS_CAST_END.
* data/skeletons/glr.c (YY_FPRINTF): New, replaces YYFPRINTF, wrapped
with YY_IGNORE_USELESS_CAST_BEGIN and YY_IGNORE_USELESS_CAST_END.
(YY_DPRINTF): Likewise.
* tests/actions.at: Remove useless cast.
* tests/headers.at: Adjust.
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/configure.ac b/configure.ac index 45f87370..7a80eac1 100644 --- a/configure.ac +++ b/configure.ac @@ -151,8 +151,6 @@ if test "$enable_gcc_warnings" = yes; then # Warnings for the test suite, and maybe for bison if GCC is modern # enough. - gl_WARN_ADD([-Wmissing-declarations], [WARN_CFLAGS_TEST]) - gl_WARN_ADD([-Wmissing-prototypes], [WARN_CFLAGS_TEST]) test $lv_cv_gcc_pragma_push_works = yes && AS_VAR_APPEND([WARN_CFLAGS], [" $WARN_CFLAGS_TEST"]) @@ -179,6 +177,14 @@ if test "$enable_gcc_warnings" = yes; then [[if (sizeof (long) < sizeof (int)) return 1;]])]) gl_WARN_ADD([-Wzero-as-null-pointer-constant], [WARN_CXXFLAGS], [AC_LANG_PROGRAM([], [nullptr])]) + # Before GCC6, the pragmas don't work well enough to neutralize + # this warning. + gl_WARN_ADD([-Wuseless-cast], [WARN_CXXFLAGS], + [AC_LANG_PROGRAM([], [ + #if defined __GNUC__ && ! defined __ICC && ! defined __clang__ && __GNUC__ < 6 + syntax error + #endif + ])]) gl_WARN_ADD([-Werror], [WERROR_CXXFLAGS]) # Warnings for the test suite only. for i in $warn_tests; |