PATCH - support for SYSROOT[_HEADERS]_SUBDIR_SPEC

[gp@qnx.com]

Hi.

This patch adds support for SYSROOT_SUBDIR_SPEC and
SYSROOT_HEADERS_SUBDIR_SPEC as per discussions on the gcc mailing list.

It allows subdirs for binaries and/or headers to be spec'd and used iff
TARGET_SYSTEM_ROOT is set.  If defined, the values specified are appended to
the sysroot. 

This is part of the pending support for QNX Neutrino.  Our sysroot has a
single common usr/include with cpu subdirs for binaries.  For example:

  ${sysroot}/usr/include
  ${sysroot}/armle/lib
  ${sysroot}/armbe/lib

So the gcc/config/arm/nto.h would define a SYSROOT_SUBDIR_SPEC as follows:
  #define SYSROOT_SUBDIR_SPEC "arm%{EB:be}%{!EB:le}"

and also use it in other specs via %R.

I removed the global flag "target_system_root_changed", as with it, I was not
seeing the correct usr/include when using sysroot.

Please let me know.  I have a patch almost ready for i386 QNX Neutrino that
relies on this patch, and would like to submit it ASAP.

Regards,
GP

Graeme Peterson
QNX Tools Group
gp@qnx.com

-------------- next part --------------
A non-text attachment was scrubbed...
Name: gcc.c.diff
Type: application/octet-stream
Size: 6204 bytes
Desc: not available
URL: <http://gcc.gnu.org/pipermail/gcc-patches/attachments/20030402/feac3ced/attachment.obj>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: ChangeLogEntry
Type: application/octet-stream
Size: 142 bytes
Desc: not available
URL: <http://gcc.gnu.org/pipermail/gcc-patches/attachments/20030402/feac3ced/attachment-0001.obj>