build: allow --set-more-warnings=no|yes|error

For the GNOME autobuilders, we want compiler warnings, but don't want
-Werror.  For developer compatibility, the default value is "error".

https://bugzilla.gnome.org/show_bug.cgi?id=668974

diff --git a/m4/compiler_warnings.m4 b/m4/compiler_warnings.m4
index 575ea9a..eeacfae 100644 (file)
--- a/m4/compiler_warnings.m4
+++ b/m4/compiler_warnings.m4
@@ -1,7 +1,7 @@
 AC_DEFUN([NM_COMPILER_WARNINGS],
 [AC_ARG_ENABLE(more-warnings,
-       AS_HELP_STRING([--enable-more-warnings], [Maximum compiler warnings]),
-       set_more_warnings="$enableval",set_more_warnings=yes)
+       AS_HELP_STRING([--enable-more-warnings], [Possible values: no/yes/error]),
+       set_more_warnings="$enableval",set_more_warnings=error)
 AC_MSG_CHECKING(for more warnings)
 if test "$GCC" = "yes" -a "$set_more_warnings" != "no"; then
        AC_MSG_RESULT(yes)
@@ -26,7 +26,9 @@ if test "$GCC" = "yes" -a "$set_more_warnings" != "no"; then
                unset SAVE_CFLAGS
        done
        unset option
-       CFLAGS="$CFLAGS -Werror"
+       if test "x$set_more_warnings" = xerror; then
+               CFLAGS="$CFLAGS -Werror"
+       fi
 else
        AC_MSG_RESULT(no)
 fi