#9382: atlas not respecting SAGE_FAT_BINARY on i686 systems
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Reporter: mariah | Owner: Mariah Lenox
Type: defect | Status: needs_review
Priority: major | Milestone: sage-4.7.1
Component: packages | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author: Mariah Lenox, Willem Jan Palenstijn
Merged: | Dependencies:
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Comment(by leif):
Replying to [comment:17 vbraun]:
> Though I'm not sure if anybody ever verified that ATLAS, with these
settings, indeed does not use any more advanced isa extensions.
Regarding that a) the notion of "fat" binaries is misleading (because
"fat" originally refers to '''different''' code for different [flavours
of] processors in the '''same''' binary / executable), and b) there's
neither a definition nor a consistent practice of what ISA subsets Sage
uses if `SAGE_FAT_BINARY=yes`, I think we can then close this ticket.
If someone complains, we can always change the behaviour of the affected
spkg(s); with the exception of AFAIK very rare `SIGILL` reports for binary
distributions Mariah seems to be the only one who actually regularly tests
this feature.
We could of course over time collect what different spkgs do, on a wiki
page, though.
(For most packages and binary distributions adding `-march=...` or
`-mcpu=...` to `CFLAGS` -- or configuring GCC to default to these --
should be sufficient anyway; building binary Sage distributions on less
advanced processors is another way.)
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9382#comment:19>
Sage <http://www.sagemath.org>
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