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author | Jim Meyering <meyering@redhat.com> | 2009-11-19 15:39:47 +0100 |
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committer | Jim Meyering <meyering@redhat.com> | 2009-11-20 10:20:54 +0100 |
commit | 163f2fa3e873d2dfebce2c41abc8532a9fa370f9 (patch) | |
tree | 32421a879a325e21adaa3d57f5f5f579aeeb5f10 /configure.ac | |
parent | 3eee17bbbe3798d91b9e36f5756b0de391eb61d5 (diff) | |
download | diffutils-163f2fa3e873d2dfebce2c41abc8532a9fa370f9.tar.gz |
build: enable many warnings
* configure.ac: Add support for --enable-gcc-warnings.
* bootstrap.conf (gnulib_modules): Add manywarnings.
* Makefile.am (AM_CFLAGS): Add $(WARN_CFLAGS) $(WERROR_CFLAGS)
Diffstat (limited to 'configure.ac')
-rw-r--r-- | configure.ac | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index b56139c..044237b 100644 --- a/configure.ac +++ b/configure.ac @@ -41,6 +41,88 @@ gl_USE_SYSTEM_EXTENSIONS AC_SYS_LARGEFILE gl_INIT +AC_ARG_ENABLE([gcc-warnings], + [AS_HELP_STRING([--enable-gcc-warnings], + [turn on lots of GCC warnings (for developers)])], + [case $enableval in + yes|no) ;; + *) AC_MSG_ERROR([bad value $enableval for gcc-warnings option]) ;; + esac + gl_gcc_warnings=$enableval], + [gl_gcc_warnings=no] +) + +if test "$gl_gcc_warnings" = yes; then + gl_WARN_ADD([-Werror], [WERROR_CFLAGS]) + AC_SUBST([WERROR_CFLAGS]) + + nw= + # This, $nw, is the list of warnings we disable. + nw="$nw -Wdeclaration-after-statement" # too useful to forbid + nw="$nw -Waggregate-return" # anachronistic + nw="$nw -Wlong-long" # C90 is anachronistic (lib/gethrxtime.h) + nw="$nw -Wc++-compat" # We don't care about C++ compilers + nw="$nw -Wundef" # Warns on '#if GNULIB_FOO' etc in gnulib + nw="$nw -Wtraditional" # Warns on #elif which we use often + nw="$nw -Wcast-qual" # Too many warnings for now + nw="$nw -Wconversion" # Too many warnings for now + nw="$nw -Wsystem-headers" # Don't let system headers trigger warnings + nw="$nw -Wsign-conversion" # Too many warnings for now + nw="$nw -Wtraditional-conversion" # Too many warnings for now + nw="$nw -Wunreachable-code" # Too many warnings for now + nw="$nw -Wpadded" # Our structs are not padded + nw="$nw -Wredundant-decls" # openat.h declares e.g., mkdirat + nw="$nw -Wlogical-op" # any use of fwrite provokes this + nw="$nw -Wformat-nonliteral" # who.c and pinky.c strftime uses + nw="$nw -Wvla" # warnings in gettext.h + nw="$nw -Wnested-externs" # use of XARGMATCH/verify_function__ + nw="$nw -Wswitch-enum" # Too many warnings for now + nw="$nw -Wswitch-default" # Too many warnings for now + nw="$nw -Wstack-protector" # not worth working around + # things I might fix soon: + nw="$nw -Wfloat-equal" # sort.c, seq.c + nw="$nw -Wmissing-format-attribute" # copy.c + nw="$nw -Wunsafe-loop-optimizations" # a few src/*.c + nw="$nw -Winline" # system.h's readdir_ignoring_dot_and_dotdot + nw="$nw -Wstrict-overflow" # expr.c, pr.c, tr.c, factor.c + nw="$nw -Wformat-extra-args" # sdiff.c + # ?? -Wstrict-overflow + + gl_MANYWARN_ALL_GCC([ws]) + gl_MANYWARN_COMPLEMENT([ws], [$ws], [$nw]) + for w in $ws; do + gl_WARN_ADD([$w]) + done + gl_WARN_ADD([-Wno-missing-field-initializers]) # We need this one + gl_WARN_ADD([-Wno-sign-compare]) # Too many warnings for now + gl_WARN_ADD([-Wno-pointer-sign]) # Too many warnings for now + gl_WARN_ADD([-Wno-unused-parameter]) # Too many warnings for now + + # In spite of excluding -Wlogical-op above, it is enabled, as of + # gcc 4.5.0 20090517, and it provokes warnings in cat.c, dd.c, truncate.c + gl_WARN_ADD([-Wno-logical-op]) + + gl_WARN_ADD([-fdiagnostics-show-option]) + gl_WARN_ADD([-funit-at-a-time]) + + AC_SUBST([WARN_CFLAGS]) + + AC_DEFINE([lint], [1], [Define to 1 if the compiler is checking for lint.]) + AC_DEFINE([_FORTIFY_SOURCE], [2], + [enable compile-time and run-time bounds-checking, and some warnings]) + AC_DEFINE([GNULIB_PORTCHECK], [1], [enable some gnulib portability checks]) + + # We use a slightly smaller set of warning options for lib/. + # Remove the following and save the result in GNULIB_WARN_CFLAGS. + nw= + nw="$nw -Wuninitialized" + nw="$nw -Wunused-macros" + nw="$nw -Wmissing-prototypes" + nw="$nw -Wold-style-definition" + gl_MANYWARN_COMPLEMENT([GNULIB_WARN_CFLAGS], [$WARN_CFLAGS], [$nw]) + AC_SUBST([GNULIB_WARN_CFLAGS]) +fi + AC_C_INLINE AC_C_VARARRAYS |