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dnl Check if the compiler supports useful warning options. There's a few that
dnl we don't use, simply because they're too noisy:
dnl
dnl -Wconversion (useful in older versions of gcc, but not in gcc 2.7.x)
dnl -Wredundant-decls (system headers make this too noisy)
dnl -Wpointer-arith I have problems with the glibc.
dnl -Wtraditional (combines too many unrelated messages, only a few useful)
dnl -Wcast-qual because with char * cp; const char * ccp;
dnl cp = (char *) ccp;
dnl is the only portable way to do cp = ccp;
dnl -pedantic
dnl
#serial 3
AC_DEFUN([ad_GCC_WARNINGS],
[AC_ARG_ENABLE(warnings,
[ --enable-warnings enable compiler warnings])
if test "$enable_warnings" = "yes"; then
CF_GCC_WARNINGS
fi])
AC_DEFUN([CF_GCC_WARNINGS],
[if test -n "$GCC"; then
AC_CACHE_CHECK([for gcc warning options], ac_cv_prog_gcc_warn_flags,
[changequote(,)dnl
cat > conftest.$ac_ext <<EOF
#line __oline__ "configure"
int main(int argc, char *argv[]) { return argv[argc-1] == 0; }
EOF
changequote([,])dnl
cf_save_CFLAGS="$CFLAGS"
ac_cv_prog_gcc_warn_flags="-W -Wall"
for cf_opt in \
Wbad-function-cast \
Wcast-align \
Wmissing-declarations \
Wmissing-prototypes \
Wnested-externs \
Wshadow \
Wstrict-prototypes \
Wwrite-strings
do
CFLAGS="$cf_save_CFLAGS $ac_cv_prog_gcc_warn_flags -$cf_opt"
if AC_TRY_EVAL(ac_compile); then
test -n "$verbose" && AC_MSG_RESULT(... -$cf_opt)
ac_cv_prog_gcc_warn_flags="$ac_cv_prog_gcc_warn_flags -$cf_opt"
test "$cf_opt" = Wcast-qual && ac_cv_prog_gcc_warn_flags="$ac_cv_prog_gcc_warn_flags -DXTSTRINGDEFINES"
fi
done
rm -f conftest*
CFLAGS="$cf_save_CFLAGS"])
fi
EXTRA_CFLAGS="${ac_cv_prog_gcc_warn_flags}"
AC_SUBST(EXTRA_CFLAGS)
])dnl
|
