Compile with '-W' in devel mode if supported

diff --git a/aclocal.m4 b/aclocal.m4
index 32f828fda8b1b3dfd94e77356cda80c38dc21d20..bfae296282fbef451022af700d1fddc30d9d7fcb 100644 (file)
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -878,6 +878,7 @@ AC_DEFUN(AC_LBL_DEVEL,
            #
            if test "$ac_lbl_cc_dont_try_gcc_dashW" != yes; then
                    AC_LBL_CHECK_UNKNOWN_WARNING_OPTION_ERROR()
+                   AC_LBL_CHECK_COMPILER_OPT($1, -W)
                    AC_LBL_CHECK_COMPILER_OPT($1, -Wall)
                    AC_LBL_CHECK_COMPILER_OPT($1, -Wcomma)
                    AC_LBL_CHECK_COMPILER_OPT($1, -Wdeclaration-after-statement)

diff --git a/configure b/configure
index 381407176e4daed81e5dc303c2b6f08e08b3f2a9..a63dcf457989aa09a12a59695e6622bab3471977 100755 (executable)
--- a/configure
+++ b/configure
@@ -8534,6 +8534,88 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
        CFLAGS="$save_CFLAGS"
 
 
+       { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the compiler supports the -W option" >&5
+$as_echo_n "checking whether the compiler supports the -W option... " >&6; }
+       save_CFLAGS="$CFLAGS"
+       if expr "x-W" : "x-W.*" >/dev/null
+       then
+           CFLAGS="$CFLAGS $ac_lbl_unknown_warning_option_error -W"
+       elif expr "x-W" : "x-f.*" >/dev/null
+       then
+           CFLAGS="$CFLAGS -Werror -W"
+       elif expr "x-W" : "x-m.*" >/dev/null
+       then
+           CFLAGS="$CFLAGS -Werror -W"
+       else
+           CFLAGS="$CFLAGS -W"
+       fi
+       cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+return 0
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+               { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+               can_add_to_cflags=yes
+               #
+               # The compile supports this; do we have some C code for
+               # which the warning should *not* appear?
+               # We test the fourth argument because the third argument
+               # could contain quotes, breaking the test.
+               #
+               if test "x" != "x"
+               then
+                   CFLAGS="$CFLAGS $ac_lbl_cc_force_warning_errors"
+                   { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether -W " >&5
+$as_echo_n "checking whether -W ... " >&6; }
+                   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+                       #
+                       # Not a problem.
+                       #
+                       { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+
+else
+
+                       #
+                       # A problem.
+                       #
+                       { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+                       can_add_to_cflags=no
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+               fi
+               CFLAGS="$save_CFLAGS"
+               if test x"$can_add_to_cflags" = "xyes"
+               then
+                   V_CCOPT="$V_CCOPT -W"
+               fi
+
+else
+
+               { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+               CFLAGS="$save_CFLAGS"
+
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+
+
        { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the compiler supports the -Wall option" >&5
 $as_echo_n "checking whether the compiler supports the -Wall option... " >&6; }
        save_CFLAGS="$CFLAGS"