880131a0c3
* m4/gccwarns.m4: Add -Wno-gnu to workaround a diagnostic from clang 3.9.1 on arch Linux. clang was complaining whtat assert() is using a GNU extension.
58 lines
1.8 KiB
Text
58 lines
1.8 KiB
Text
dnl Check if the compiler supports useful warning options. There's a few that
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dnl we don't use, simply because they're too noisy:
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dnl
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dnl -ansi (prevents declaration of functions like strdup, and because
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dnl it makes warning in system headers).
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dnl -Wconversion (useful in older versions of gcc, but not in gcc 2.7.x)
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dnl -Wtraditional (combines too many unrelated messages, only a few useful)
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dnl -Wredundant-decls (system headers make this too noisy)
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dnl -pedantic
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dnl -Wunreachable-code (broken, see GCC PR/7827)
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dnl -Wredundant-decls (too many warnings in GLIBC's header with old GCC)
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dnl
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dnl A few other options have been left out because they are annoying in C++.
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AC_DEFUN([CF_GCC_WARNINGS],
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[if test -n "$GCC"; then
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AC_CACHE_CHECK([for $GCC warning options], ac_cv_prog_gcc_warn_flags,
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[
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cat > conftest.$ac_ext <<EOF
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#line __oline__ "configure"
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int main(int argc, char *argv[[]]) { return argv[[argc-1]] == 0; }
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EOF
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cf_save_CFLAGS="$CFLAGS"
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ac_cv_prog_gcc_warn_flags="-W -Wall"
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for cf_opt in \
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Werror \
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Wint-to-void-pointer-cast \
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Wzero-as-null-pointer-constant \
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Wcast-align \
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Wpointer-arith \
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Wwrite-strings \
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Wcast-qual \
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Wdocumentation \
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Wmissing-declarations \
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Wnoexcept \
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Woverloaded-virtual \
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Wmisleading-indentation \
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Wimplicit-fallthrough \
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Wlogical-op \
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Wduplicated-cond \
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Wnull-dereference \
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Wsuggest-override \
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Wpedantic \
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Wno-gnu \
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Wno-long-long
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do
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CFLAGS="$cf_save_CFLAGS $ac_cv_prog_gcc_warn_flags -$cf_opt"
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if AC_TRY_EVAL(ac_compile); then
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ac_cv_prog_gcc_warn_flags="$ac_cv_prog_gcc_warn_flags -$cf_opt"
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test "$cf_opt" = Wcast-qual && ac_cv_prog_gcc_warn_flags="$ac_cv_prog_gcc_warn_flags -DXTSTRINGDEFINES"
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fi
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done
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rm -f conftest*
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CFLAGS="$cf_save_CFLAGS"
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])
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fi
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CFLAGS="$CFLAGS ${ac_cv_prog_gcc_warn_flags}"
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])
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