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more sysroot support in the linker

Alexandre Oliva aoliva@redhat.com
Sun Mar 23 10:33:00 GMT 2003 
Sometimes GCC passes to the linker -L flags that point into the
sysroot tree.  In this case, our sysroot triggers didn't take effect,
so full pathnames in say glibc libc.so linker scripts wouldn't be
searched inside the sysroot.  I found it confusing that -L flags would
override sysroot.  Also, a full pathname of such a linker script,
specified in the linker command line, would not be regarded as inside
the sysroot either.  This patch fixes both cases, also making the
error message that you get about the linker not having been able to
find a full pathname inside the sys-root (even if it would be found if
searched outside the sys-root, which we don't want to do; I ran into
this because I still had an old libc.so in the sysroot tree, with
pathnames containing the sysroot pathnames).  It also removes a
situation I consider wrong, which is that we'd iterate the search for a
full pathname over all search directories.  This is silly.  We already
do the search for full pathnames before entering the loop, so I just
got us to return immediately when given full pathnames.

Tested on athlon-pc-linux-gnu-x-mips64-linux-gnu.  Ok to install?

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-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                 aoliva@{redhat.com, gcc.gnu.org}
CS PhD student at IC-Unicamp        oliva@{lsd.ic.unicamp.br, gnu.org}
Free Software Evangelist                Professional serial bug killer
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