Bootstrap failure on powerpc64

[Josef Zlomek]

With current mainline I get:

stage1/xgcc -Bstage1/ -B/usr/local/powerpc64-unknown-linux-gnu/bin/ -c   -g -O2
-DIN_GCC   -W -Wall -Wwrite-strings -Wstrict-prototypes -Wmissing-prototypes
-pedantic -Wno-long-long -Wold-style-definition -Werror -fno-common
-DHAVE_CONFIG_H    -I. -I. -I../../gcc -I../../gcc/. -I../../gcc/../include
../../gcc/pretty-print.c -o pretty-print.o
../../gcc/pretty-print.c: In function `pp_base_format_text':
../../gcc/pretty-print.c:295: warning: 's' might be used uninitialized in this
function
make[2]: *** [pretty-print.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[2]: Leaving directory `/gcc-main/build/gcc'
make[1]: *** [stage2_build] Error 2
make[1]: Leaving directory `/gcc-main/build/gcc'
make: *** [bootstrap] Error 2

The hunk of code is the following:
          {
            int n;
            const char *s;
            /* We handle no precision specifier but `%.*s'.  */
            if (*++text->format_spec != '*')
              abort ();
            else if (*++text->format_spec != 's')
              abort ();
            n = va_arg (*text->args_ptr, int);
            s = va_arg (*text->args_ptr, const char *);
            pp_append_text (pp, s, s + n);
          }

Josef