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[PATCH, i386-driver]: Ignore -march and -mtune for native target when not compiled with gcc

From: Uros Bizjak <ubizjak at gmail dot com>
To: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
Date: Tue, 2 Jun 2009 13:16:23 +0200
Subject: [PATCH, i386-driver]: Ignore -march and -mtune for native target when not compiled with gcc

Hello!

Attached patch teaches i386 driver to ignore -march and -mtune
switches for native target when the driver is not compiled with gcc.
By ignoring the switches, the compiler generates code for its default
target, which is max that we can do in this case (*). The driver also
optimizes concatenation of options a bit.

2009-06-02  Uros Bizjak  <ubizjak@gmail.com>

	* config/i386/driver-i386.c (describe_cache): Optimize
	concatenation of strings.
	(host_detect_local_cpu): Ditto.
	(host_detect_local_cpu): Ignore -march and -mtune for native
	target when not compiling with GCC.

Any comments on this approach?

(*) driver uses gcc specific asm to use cpuid insn, so it must be
compiled using gcc.

Uros.

Attachment: p.diff.txt
Description: Text document

Follow-Ups:
- Re: [PATCH, i386-driver]: Ignore -march and -mtune for native target when not compiled with gcc
  - From: Ian Lance Taylor

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