[Bug bootstrap/12173] New: IRIX 6 O32 (with as) bootstrap failure due to gcc -g -E warning

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12173

           Summary: IRIX 6 O32 (with as) bootstrap failure due to gcc -g -E
                    warning
           Product: gcc
           Version: 3.4
            Status: UNCONFIRMED
          Severity: critical
          Priority: P2
         Component: bootstrap
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ro at techfak dot uni-bielefeld dot de
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: mips-sgi-irix6.5o32
  GCC host triplet: mips-sgi-irix6.5o32
GCC target triplet: mips-sgi-irix6.5o32

Between 20030703 and 20030808, bootstrap of mips-sgi-irix6.5o32 (with
native as) started to fail configuring libf2c and libobjc.

configure: error: Can't find stdio.h.
You must have a usable C system for the target already installed, at least
including headers and, preferably, the library, before you can configure
the G77 runtime system.  If necessary, install gcc now with `LANGUAGES=c',
then the target library, then build with `LANGUAGES=f77'.
make[1]: *** [configure-target-libf2c] Error 1

Looking at config.log, one finds the following:

configure:2442: checking for stdio.h
configure:2452: /vol/gcc/obj/gcc-3.4-20030808/6.5o32-cc-as/gcc/xgcc -B/vol/gcc/obj/gcc-3.4-20030808/6.5o32-cc-as/gcc/ -B/vol/gcc/share/mips-sgi-irix6.5o32/bin/ -B/vol/gcc/share/mips-sgi-irix6.5o32/lib/ -isystem /vol/gcc/share/mips-sgi-irix6.5o32/include -isystem /vol/gcc/share/mips-sgi-irix6.5o32/sys-include -E -O2 -g conftest.c >/dev/null 2>conftest.out
cc1: warning: target system does not support debug output
configure: failed program was:
#line 2447 "configure"
#include "confdefs.h"
#include <stdio.h>

Comparing this with the old (good) bootstrap, the difference is in the cc1
warning.  This boils down to the following minimal testcase:

touch test.c
./xgcc -B./ -E -O2 -g test.c > /dev/null
cc1: warning: target system does not support debug output

I get this warning as of 20030808, but there is no output on 20030703.

This is most certainly due to Neil's option processing rewrite.

The warning happened before when compiling:

./xgcc -B./ -c -g test.c
cc1: warning: `-g': unknown or unsupported -g option

The wording is changed now:

cc1: warning: target system does not support debug output

Environment:
System: IRIX sculptor 6.5 07141608 IP32


	
host: mips-sgi-irix6.5o32
build: mips-sgi-irix6.5o32
target: mips-sgi-irix6.5o32
configured with: /vol/gnu/src/gcc/gcc-dist/configure --prefix=/vol/gcc --with-local-prefix=/vol/gcc --disable-nls mips-sgi-irix6.5o32

How-To-Repeat:
Bootstrap gcc as above.