From: Benjamin Herrenschmidt Date: Tue, 3 May 2005 05:34:58 +0000 (+1000) Subject: [PATCH] ppc64: fix gcc 4.0 vs CONFIG_ALTIVEC X-Git-Tag: v2.6.12-rc4~117^2~25 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=52292c9b8c16aa9024a65aaeeca434bb8fec7d24;p=pandora-kernel.git [PATCH] ppc64: fix gcc 4.0 vs CONFIG_ALTIVEC gcc-4.0 generates altivec code implicitly when -mcpu indicates an altivec capable CPU which is not suitable for the kernel. However, we used to set -mcpu=970 when CONFIG_ALTIVEC was set because a gcc-3.x bug prevented from using -maltivec along with -mcpu=power4, thus prevented building the RAID6 altivec code. This patch fixes all of this by testing for the gcc version. If 4.0 or later, just normally use -mcpu=power4 and let the RAID6 code add -maltivec to the few files it needs to be compiled with altivec support. For 3.x, we still use -mcpu=970 to work around the above problem, which is fine as 3.x will never implicitly generate altivec code. The Makefile hackery may not be the most lovely, I welcome anybody more skilled than me to improve it. Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Linus Torvalds --- Reading git-diff-tree failed