Hello,

On Tue, 16 Dec 2003 22:33:41 +0100 (CET)
"Maciej W. Rozycki" [off-list ref] wrote:

Hello,

 Since command line options for both gcc and gas has been changed in an 
incompatible way recently and also there are stricter requirements on 
certain options when used simultaneously, I propose the following patch to 
our top-level Makefiles to let the optimal set of options be selected at 
the build time.  The intent is to try modern options first, then obsolete 
ones and to set gas options independently to gcc ones as one may be more 
inclined to upgrade binutils that his old trusty gcc.

 The patch implements a make macro called set_gccflags which accepts two
sets of options consisting of a CPU name and an ISA name each.  Within 
both sets "-march=" and failing that "-mcpu=" is checked with the CPU name 
and the ISA name is checked simultaneously.  For gcc if the first set of 
options fails, the second one is selected even if it would lead to a 
failure.  For gas both sets are checked and if none succeeds, an empty set 
is selected.

 The 32-bit variation accepts a fifth option as well to permit ABI
selection with an ISA when the "-mabi=" option is unavailable, which is 
also tested.

 Beside letting one use modern tools at all the patch also enables CPU
selection using newly added (and closer matching) settings like
"-march=mips64" without forcing users to upgrade tools provided a
conservative fallback is provided.

 Comments, thoughts, opinions, etc. will be appreciated.

This patch is wonderful for vr4100 series!

I'm using "GNU assembler version 2.14.90.0.6".
The gcc option is set up appropriately.

Thanks,

Yoichi