PATCH: --sysroot-suffix

[Richard Sandiford]

Mark Mitchell <mark@codesourcery.com> writes:
> Daniel Jacobowitz wrote:
>> Would a --sysroot option work for you instead?  I can't think of any
>> realistic configurations where GCC and LD would have different
>> sysroots, so passing it down from gcc makes some sense.

Sounds like this changeable sysroot thing is a hotter topic than
I'd realised.  As mentioned on gcc@:

    http://gcc.gnu.org/ml/gcc/2004-12/msg00099.html

I've got some patches to add the --sysroot option that Daniel suggests,
but I've been sitting on them waiting for gcc to enter stage 1 (or for
the 2.16 release process to kick off, whichever was sooner).

FWIW, the patches are attached.  They were developed against slightly
older versions of the tools and I haven't tested whether they still
work.  There are no docs yet either.  Still, I thought it might be
worth throw ingthem into this thread to see what you folks think.
I can update them, test them, and document them if it's thought
to be way to go.

The patches were originally tested on a mips64-linux-gnu cross.
Due to the wonders of gcc's option mangling, the gcc part will
accept both --sysroot=/path and -fsysroot=/path.

> To do what you suggest, I would have to make more invasive changes to
> the GCC driver.  Because the driver can't assume that binutils supports
> the new option, I was just modifying the linker spec for the target in
> question.

Might be missing the point here, but in the patches below, gcc will only
handle --sysroot=/-fsysroot= correctly if the linker also understands
--sysroot=.  It seemed like a reasonable restriction at the time
but I'd be interested to know what others think.

Richard


ld/
	* ldmain.h (ld_sysroot): Change type to a constant string.
	* ldmain.c (ld_sysroot): Likewise.
	(get_relative_sysroot, get_sysroot): New functions, adding command-line
	support for changing the sysroot.
	(main): Call the new functions.
	* lexsup.c (OPTION_SYSROOT): New.
	(ld_options): Add --sysroot.
	(parse_args): Add a dummy handler for it.

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gcc/
	* gcc.c (process_command): Handle -fsysroot=.  Bypass relocatable
	sysroot handling if the sysroot has been set on the command line.
	
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