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Date: Thu, 30 Dec 2004 04:02:17 -0700
From: Brian Inglis <Brian DOT Inglis AT SystematicSw DOT ab DOT ca>
Subject: Re: tests/libc/ansi/time/makefile problems
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On Sun, 31 Oct 2004 12:10:21 +0100 (CET), ams AT ludd DOT ltu DOT se wrote:

>According to Brian Inglis:
>> >> >Can anyone run make successfully in tests/libc/ansi/time/?
>> >Without that line make says:
>> >gcc @../../../gcc.opt -I. -I- -I../../../../include  -c xstrftm.c
>> >cc1.exe: warnings being treated as errors
>> >xstrftm.c: In function `main':
>> >xstrftm.c:17: warning: `%x' yields only last 2 digits of year in some locales
>> >I'm using gcc 2.953.
>> 
>> Not seeing that with 3.4.1. 
>> Check gcc*.opt to see if -Wformat and -pedantic or -Wformat-y2k is
>> set, and change to or add -Wno-format-y2k. 
>
>No -Wformat, -pedantic or -Wformat-y2k present. Adding -Wno-format-y2k
>makes no difference (still warns about %x).
>
>Here's tests/gcc.opt (with -Wno-format-y2k added by me):
>-MD
>-O3
>-g
>-Wall
>-Wbad-function-cast
>-Wcast-qual
>-Werror
>-Wpointer-arith
>-Wshadow
>-Wstrict-prototypes
>-Wwrite-strings
>-Wno-format-y2k
>-nostdinc
>
>in case you see something obvious.

Should work or you should get a compiler option warning. 

The default was changed for gcc 3.4 from:
option -Wall implies -Wformat including -Wformat-y2k, and
-Wno-format-y2k is required to not invoke Y2K format checks;
to:
option -Wall implies -Wformat excluding -Wformat-y2k, and -Wformat-y2k
or -Wformat=2 are required to invoke Y2K format checks. 

This was gcc 3.4 PR c/3190 aka c/8714
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3190
to c_format.c rev 1.50 noted in ChangeLog rev 2.1706 documented in
doc/invoke.texi rev 1.358