[PATCH] Fix PR other/7956

[Eric Botcazou]

Hi,

This is an old problem related to multilib on SPARC/Solaris 7, 8 and 9.  The 
compiler is always built as a multiarch compiler on these platforms, and by 
default, as a multilib compiler.  Now, you may want (or need) not to build 
both flavors of the libraries by passing --disable-multilib to the top-level 
configure script.

So, in this case, you end up with a multiarch but not multilib compiler. This 
means that you can compile but not link, the error issued in the latter case 
being a bit cryptic:

ld: fatal: file /usr/lib/sparcv9/values-Xa.o: cannot open file: No such file 
or directory
ld: fatal: file /var/tmp//ccKb4eqM.o: wrong machine class
ld: fatal: File processing errors. No output written to a.out
collect2: ld returned 1 exit status

The attached patch turns the error message into:
gcc: does not support multilib

Compiled on sparc64-sun-solaris2.9 and sparc-sun-solaris2.8. Ok for mainline?


2003-12-02  Eric Botcazou  <ebotcazou@libertysurf.fr>

        PR other/7956
	* genmultilib: New variable disable_multilib.  Set it to 'yes'
	if enable_multilib was set to 'no'.  Emit DISABLE_MULTILIB
	if disable_multilib was set to 'yes'.
	* gcc.c: Include multilib.h before tm.h.
	* config/sparc/sol2-bi.h (LINK_ARCH_SPEC): Emit an error
	message for multiarch options if DISABLE_MULTILIB is set.

--
Eric Botcazou
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