[oe] Qt and detecting iWMMXT
Enrico Scholz
enrico.scholz at sigma-chemnitz.de
Sat Sep 25 14:21:36 UTC 2010
Holger Freyther <holger+oe at freyther.de> writes:
> when building for XScale one could pass -iwmmxt to the configure
> script.
I would avoid -march=iwmmxt because
a) there seems to be kernel bug which does not restore IWMMXT state on
ELF loading[1]
b) gcc 4.4.4 is bugged for this architecture (both ICE and generation of
inefficent code) and fails e.g. to bootstrap itself or glibc
When you really need iwmmxt support, I recommend to add '.arch iwmmxt'
to (inline) assembler instead of using -march=iwmmxt.
Enrico
Footnotes:
[1] http://article.gmane.org/gmane.linux.ports.arm.general/11795
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