[Bug driver/46501] Relocatable toolchains still search --prefix

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46501

--- Comment #2 from nightstrike <nightstrike at gmail dot com> 2010-11-16 17:48:32 UTC ---
Configure:
../../../build/gcc/src/configure \
    --target=i686-w64-mingw32 \
     \
    --prefix=/buildbot/mingw-w64/linux-x86_64-x86/build/build/root \
    --with-sysroot=/buildbot/mingw-w64/linux-x86_64-x86/build/build/root \
    --enable-languages=all,obj-c++ \
    --enable-fully-dynamic-string --disable-multilib


Build toolchain, install to $prefix.

cd $prefix && tar cjf a.tbz2 * (or similar)
cd /usr && tar xjf a.tbz2 (or equivalent)


So what we are doing is essentially building a "relocatable" toolchain,
installing it to some location, tarring up that location, and then extracting
it wherever we want.  The user referenced in the URL attached this PR wanted to
extract it to /usr (thus causing the issue of the embedded directory "root"),
but the eventual location you extract to doesn't affect the inclusion of
directories outside of the gcc hierarchy.  Observe:


i686-w64-mingw32-gcc -print-search-dirs:

install: /usr/bin/../lib/gcc/i686-w64-mingw32/4.6.0/ programs:
=/usr/bin/../libexec/gcc/i686-w64-mingw32/4.6.0/:/usr/bin/../libexec/gcc/:/usr/bin/../lib/gcc/i686-w64-mingw32/4.6.0/../../../../i686-w64-mingw32/bin/i686-w64-mingw32/4.6.0/:/usr/bin/../lib/gcc/i686-w64-mingw32/4.6.0/../../../../i686-w64-mingw32/bin/
libraries:
=/usr/bin/../lib/gcc/i686-w64-mingw32/4.6.0/:/usr/bin/../lib/gcc/:/usr/bin/../lib/gcc/i686-w64-mingw32/4.6.0/../../../../i686-w64-mingw32/lib/i686-w64-mingw32/4.6.0/:/usr/bin/../lib/gcc/i686-w64-mingw32/4.6.0/../../../../i686-w64-mingw32/lib/../lib/:/usr/bin/../../root/mingw/lib/i686-w64-mingw32/4.6.0/:/usr/bin/../../root/mingw/lib/../lib/:/usr/bin/../lib/gcc/i686-w64-mingw32/4.6.0/../../../../i686-w64-mingw32/lib/:/usr/bin/../../root/mingw/lib/


You can see in there where there are references to "root".  These are what are
incorrect.

Please let me know if that is enough information for you.