[Bug c/49560] New: -fexec-charset=IBM-1047 makes -Wformat report incorrect warnings

["jphartmann at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49560

           Summary: -fexec-charset=IBM-1047 makes -Wformat report
                    incorrect warnings
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: jphartmann@gmail.com


Created attachment 24612
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24612
Preprocessor output from printf

It looks as if the translated form of the format string is used.  Removing the
substitution parameter clears the warning.  ASCII % (0x37) is not likely to be
in any string that is converted to EBCDIC.

[/home/john/src/cmsh/390] CFLAGS=-Wall make hlo
cc -Wall    hlo.c   -o hlo
[/home/john/src/cmsh/390] rm hlo
[/home/john/src/cmsh/390] CFLAGS="-fexec-charset=IBM-1047 -Wall" make hlo
cc -fexec-charset=IBM-1047 -Wall    hlo.c   -o hlo
hlo.c: In function 'main':
hlo.c:17: warning: spurious trailing '%' in format
hlo.c:17: warning: too many arguments for format


[/home/john/src/cmsh/390] gcc --version
gcc (GCC) 4.4.5 20101112 (Red Hat 4.4.5-2)

Don't know how RedHat configured the compiler.

And also with a 4.6.0 I compiled from unmodified source.
--with-gnu-as --with-gnu-ld --prefix=/home/john/pool/360/root/usr
--with-sysroot=/home/john/pool/360/root --target=s390x-ibm-linux
--enable-languages=c --with-gmp=/usr --with-mpfr=/usr --with-mpc=/usr
--disable-libgomp --disable-threads --disable-tls --disable-libada
--disable-libssp --disable-shared --without-headers --disable-lto --disable-nls

[/home/john/src/cmsh/390] uname -a
Linux bigserv 2.6.34.8-68.fc13.x86_64 #1 SMP Thu Feb 17 15:03:58 UTC 2011
x86_64 x86_64 x86_64 GNU/Linux