From 3b174c870a838ff5c0b557c308df21d27421b469 Mon Sep 17 00:00:00 2001 From: Jason Stubbs Date: Tue, 8 Nov 2005 12:18:38 +0000 Subject: Updated make.conf.ppc as requested by lu_zero (#102656) svn path=/main/trunk/; revision=2263 --- cnf/make.conf.ppc | 29 ++++++++++++++++++----------- 1 file changed, 18 insertions(+), 11 deletions(-) (limited to 'cnf') diff --git a/cnf/make.conf.ppc b/cnf/make.conf.ppc index e3af54be3..3cf2c7369 100644 --- a/cnf/make.conf.ppc +++ b/cnf/make.conf.ppc @@ -44,31 +44,38 @@ CHOST="powerpc-unknown-linux-gnu" # to optimize your code for. Code generated under those options will run best # on that processor, and may not run at all on others. # -# GCC 3.2 supports many powerpc processor types including: rios, rios1, rsc, -# rios2, rs64a, 601, 602, 603, 603e, 604, 604e, 620, 630, 740, 7400, 7450, 750, -# power, power2, powerpc, 403, 505, 801, 821, 823, and 860 and common. +# GCC 3.4 supports many powerpc processor types including: 401, 403, 405, +# 405fp, 440, 440fp, 505, 601, 602, 603, 603e, 604, 604e, 620, 630, 740, 7400, +# 7450, 750, 801, 821, 823, 860, 970, 8540, common, ec603e, G3, G4, G5, power, +# power2, power3, power4, power5, powerpc, powerpc64, rios, rios1, rios2, rsc, +# and rs64a # -# Recommended settings for GCC 3.2 only (Gentoo 1.4 or newer) : +# Recommended settings for GCC 3.4 only : # -# -maltivec enables optional (still limited) altivec support and should be used +# -maltivec enables optional altivec support and should be used # only for G4 processors, on GCC 3.2 or newer. It also requires that you have # the alitvec option compiled into your kernel to take full advantage of this -# feature. Note: you should also include -mabi=altivec flag if using this option. +# feature. Note: you should also include -mabi=altivec flag if using this +# option. +# +# The newer gcc has a stricter aliasing ruleset that makes type punned +# expression faulty compiled if -fstrict-aliasing is enabled. +# That option is implied by -O2 -Os and -O3. Make SURE you don't have that +# option enabled by adding -fno-strict-aliasing to your CFLAGS and CXXFLAGS # # Long term testing has shown that -O3 opts can be unreliable on G4's but work -# on G3 series processors or earlier. Use on a G4 at your own risk =) +# on G3 series processors or earlier. # -# Due to some failures with the cpu string of 7450, the dev team recommends -# using -mcpu=7400 for all G4 series processors until GCC 3.2 is more mature +# The following is the suggested CFLAGS for a generic G4 cpu # -#CFLAGS="-O2 -pipe -mcpu=7400 -maltivec -mabi=altivec" +#CFLAGS="-O2 -pipe -mcpu=G4 -maltivec -mabi=altivec -fno-strict-aliasing" # # # All non G4 PPC boxen should choose this next option. It will work fine for # all G3 and pre machines. (note it will not hurt pre G3 machines either to # use this mcpu option as it is the default for gcc 3.2.x anyway) # -#CFLAGS="-O3 -pipe -mcpu=750" +#CFLAGS="-O3 -pipe -mcpu=G3 -fno-strict-aliasing" # Recommended settings for GCC 2.95.3 only (Gentoo 1.2 or older): # -- cgit v1.2.3-1-g7c22