7765 – gcc 3.2 on ppc compiles unreliably using -O3 optimization

Bug 7765 - gcc 3.2 on ppc compiles unreliably using -O3 optimization

Summary: gcc 3.2 on ppc compiles unreliably using -O3 optimization

Status:	VERIFIED FIXED

Alias:	None

Product:	Gentoo Linux
Classification:	Unclassified
Component:	Current packages (show other bugs)
Hardware:	PPC Linux

Importance:	Highest critical (vote)
Assignee:	Kevyn Shortell (RETIRED)

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Depends on:
Blocks:

Reported:	2002-09-10 15:24 UTC by Kevyn Shortell (RETIRED)
Modified:	2006-02-04 06:03 UTC (History)
CC List:	1 user (show)

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Runtime testing required:	---

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Description Kevyn Shortell (RETIRED) gentoo-dev

2002-09-10 15:24:16 UTC

In using -O3 flags with gcc 3.2 on ppc, I've noticed inconsistant results in 
compiling. most things build, random things fail.

Doing a stage1 build, parts of emerge system just don't get compiled, when you 
manually try to compile the parts that were missed, some things segfault. 
This appears to be Altivec/74xx related, as Gerk reports it doesn't happen on 
75x series CPUs

Until this is nailed down to something more specific than -O3 sucks, I'd 
recommend we don't use -O3 as part of the default make.conf

Comment 1 Mark Guertin 2002-09-10 15:36:30 UTC

I will make adjustments for this tonight, and wholeheartedly agree that -O3 is a
bad thing for ppc and gcc 3.2 final (funny thing is it worked great for gcc
3.2_pre) ?

Comment 2 Jim Bray 2003-01-30 22:53:40 UTC

  I have discovered an architecture-independent bug in current Gentoo
gcc that might be what you are seeing here:

http://bugs.gentoo.org/show_bug.cgi?id=14699