other/9472: [pch] error when creating pch still causes output

[bkoz@redhat.com]

>Number:         9472
>Category:       other
>Synopsis:       [pch] error when creating pch still causes output
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Jan 28 03:46:01 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     Benjamin Kosnik
>Release:        rh 7.3, head
>Organization:
>Environment:
Reading specs from /mnt/hd/ahimsa/bld-x86-gcc/gcc/specs
Configured with: /mnt/hd/bliss/src.gcc/gcc/configure --prefix=/mnt/hd/ahimsa/H-x86-gcc --enable-languages=c,c++ --enable-__cxa_atexit
Thread model: posix
gcc version 3.4 20030126 (experimental)
>Description:

Create a bogus C++ header, try to precompile it. You'll get a warning, AND a .pch file.

This is entirely unexpected: if gcc can't compile a file, it does not then write out an invalid .o file.

>How-To-Repeat:

%COMP.sh "-x c++-header -Winvalid-pch" ostream

/mnt/hd/ahimsa/bld-x86-gcc/i686-pc-linux-gnu/libstdc++-v3/include/bits/stl_algobase.h:149: warning: inline
   function `const _Tp& std::min(const _Tp&, const _Tp&) [with _Tp = size_t]' 
   used but never defined
/usr/lib/crt1.o(.text+0x18): In function `_start':
: undefined reference to `main'
collect2: ld returned 1 exit status

%ll ostream.pch 
-rw-rw-r--    1 bkoz     bkoz         7.0M Jan 27 21:37 ostream.pch
>Fix:
Don't write out the file.
>Release-Note:
>Audit-Trail:
>Unformatted: