(In reply to David Mandelin from comment #99)
> I would suggest making the minimal change that actually works and doesn't
> make things more confusing. Exactly what that would be, I don't know without
> trying things out. My *guess* would be that adding JS_ENABLE_JIT to
> Makefile.in and using it only in the places you need here would be it. I'm

Erm... you lost me here. I though we aimed at removing those *ENABLE* being set 
in Makefile.in and moving them to configure.in/js-config.h. If i add a new 
JS_ENABLE_JIT only overlapping with the others without removing them from 
Makefile.in that'll only confuse things.
Remember that the issue we're trying to fix is getting ENABLE_ASSEMBLER "known" 
under shell/ so that the test failures are fixed.

> not sure exactly what blocks you are talking about in comment 98, but it
> sounds like a good idea.

The list of archs where METHODJIT is enabled is the same as the list of
archs where YARR_JIT is enabled, the former being set in configure.in
and the latter being set in Makefile.in. I dont know if they will be
always the same, and if so we could "merge" the two defines..

http://mxr.mozilla.org/mozilla-central/source/js/src/Makefile.in#262 <- ifdef 
ENABLE_METHODJIT block 
http://mxr.mozilla.org/mozilla-central/source/js/src/Makefile.in#344 <- list of 
ENABLE_YARR_JIT archs

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https://bugs.launchpad.net/bugs/908508

Title:
  Firefox/Thunderbird 10 FTBFS on powerpc in js/src/yarr/pcre

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