Bug 98765 – Some USE-flags (mmx, sse, 3dnow, and some other) are not used in compilation.

• Status: RESOLVED INVALID
• Product: Gentoo Linux

[Description Sergey Belyashov 2005-07-12 04:27:59 UTC]

Gentoo 2005.0
CFLAGS="-march=k8 -pipe -O2"
CXXFLAGS=$CFLAGS
All portages are last at this moment.

Reproducible: Always
Steps to Reproduce:
1. /etc/make.conf must have USE="amd64 X mmx mmxext 3dnow 3dnowext sse sse2 ..."
2. emerge --info
3. equery uses mplayer

Actual Results:  
$ cat /etc/make.conf
 ...
 USE="amd64 X mmx 3dnow sse sse2 mmxext 3dnowext ..."
 ...

$ emerge --info
 ...
 USE="amd64 X ...".
 ...
$ equery uses mplayer
 U I
 ...
 - - mmx
 - - 3dnow
 - - sse
 - - sse2
 ...

Expected Results:  
$ cat /etc/make.conf
 ...
 USE="amd64 X mmx 3dnow sse sse2 mmxext 3dnowext ..."
 ...

$ emerge --info
 ...
 USE="amd64 X mmx 3dnow sse sse2 mmxext 3dnowext ...".
 ...
$ equery uses mplayer
 U I
 ...
 + - mmx
 + - 3dnow
 + - sse
 + - sse2
 ...

When I try to change these flags: mmx -> mmx_, sse -> sse_
Then problem resolves:
$ cat /etc/make.conf
 ...
 USE="amd64 X mmx_ 3dnow_ sse_ sse2_ mmxext_ 3dnowext_ ..."
 ...
$ equery uses mplayer
 U I
 ...
 + - mmx
 + - 3dnow
 + - sse
 + - sse2
 ...

[Comment 1 Simon Stelling (RETIRED) 2005-07-12 04:30:21 UTC]

the use flags are disabled because you don't have the choice, however, they are
hard-enabled. for more info, see
http://dev.gentoo.org/~plasmaroo/devmanual//archs/amd64/#assembler-optimisation