See http://gcc.gnu.org/ml/gcc-patches/2009-11/msg01197.html
Currently, warnings enabled by flags are indicated by the flag when using
-fdiagnostics-show-option. However, warnings enabled by default do not show
anything. Two possible fixes:
1) Give the flag that enables the warning (like now). For default warnings, say
"[default warning]".
2) Give the flag that disables the warning. For default warnings, say "[-w]".
Also, it would be good to move this info after "warning:" (or "error:" if
-Werror=) to make it easier to see/parse.
Of course, anything that does not have a [something] is a hard error that
cannot be disabled.
--
Summary: add some indication that a warning has been converted to
an error
Product: gcc
Version: unknown
Status: UNCONFIRMED
Keywords: diagnostic
Severity: enhancement
Priority: P3
Component: other
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: manu at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42966
