Possible GCC 4.3 driver regression caused by your patch

[Greg Schafer <gschafer at zip dot com dot au>]

Hi Carlos and Mark,

Your "Relocated compiler should not look in $prefix" patch here:

http://gcc.gnu.org/ml/gcc/2006-10/msg00280.html

appears to have caused a regression in my GCC 4.3 testing.

In summary, there is a small window *during the GCC build itself* where GCC
does not pick up the correct startfiles. For example, when GCC_FOR_TARGET is
called to build the target libraries, the startfiles in $prefix/lib are not
used. Instead, the startfiles from the host's /usr/lib are used which breaks
my build. Note that the problem seems to rectify itself once the just-built
GCC is installed into $prefix.

Here's the scenario:

 - Native build
 - i686-pc-linux-gnu
 - --prefix=/temptools
 - Glibc already installed in /temptools/lib

Compare the following -v output snippets to demonstrate the problem:

GCC 4.2.3
$ /temptools/src/gcc-build/./gcc/xgcc -B/temptools/src/gcc-build/./gcc/ dummy.c -v
/mnt/sysroot/temptools/bin/../libexec/gcc/i686-pc-linux-gnu/4.2.3/collect2 --eh-frame-hdr -m elf_i386 --hash-style=gnu -dynamic-linker /temptools/lib/ld-linux.so.2 /mnt/sysroot/temptools/bin/../lib/gcc/i686-pc-linux-gnu/4.2.3/../../../crt1.o

GCC 4.3.0-RC1
$ /temptools/src/gcc-build/./gcc/xgcc -B/temptools/src/gcc-build/./gcc/ dummy.c -v
/temptools/src/gcc-build/./gcc/collect2 --eh-frame-hdr -m elf_i386 --hash-style=gnu -dynamic-linker /temptools/lib/ld-linux.so.2 /usr/lib/crt1.o

NOTE - I can try to work around the problem by defining
STANDARD_STARTFILE_PREFIX_1 and define STANDARD_STARTFILE_PREFIX_2 to "" in
the target headers but then the build fails when linking libgcc_s.so.1.

/temptools/i686-pc-linux-gnu/bin/ld: crti.o: No such file: No such file or directory

I realize my scenario is slightly non-standard, but nevertheless, I'd be
grateful if you could pass comment on whether this is a regression or not. I
haven't "relocated" anything. All I've done is try to build a native GCC
with --prefix=/temptools which used to work fine. Thanks for any help.

Thanks
Greg