#10252: ecm does not compile on some 32-bit Linux systems
------------------------+---------------------------------------------------
Reporter: jdemeyer | Owner: tbd
Type: defect | Status: needs_review
Priority: major | Milestone: sage-4.6.1
Component: packages | Keywords: ecm spkg-install
Author: | Upstream: Fixed upstream, but not in a stable
release.
Reviewer: | Merged:
Work_issues: |
------------------------+---------------------------------------------------
Changes (by leif):
* status: needs_work => needs_review
* upstream: N/A => Fixed upstream, but not in a stable release.
Old description:
> On the Skynet machine cicero and on a 32-bit Gentoo Linux Pentium D
> machine of my own, the ecm package from #5847 does not install in Sage.
>
> The problem is with Sage's {{{spkg-install}}} as the pure upstream
> sources in {{{src/}}} work fine.
>
> The following works:
> {{{
> $ ./configure
> $ make
> }}}
>
> The following (emulating {{{spkg-install}}}) does NOT work:
> {{{
> $ export CFLAGS="-g -O3 -fPIC"
> $ ./configure
> $ make
> }}}
>
> It fails with the error
> {{{
> spv.c: In function 'spv_pwmul':
> spv.c:157: error: unknown register name '%xmm7' in 'asm'
> spv.c:157: error: unknown register name '%xmm6' in 'asm'
> spv.c:157: error: unknown register name '%xmm5' in 'asm'
> spv.c:157: error: unknown register name '%xmm3' in 'asm'
> spv.c:157: error: unknown register name '%xmm2' in 'asm'
> spv.c:157: error: unknown register name '%xmm1' in 'asm'
> spv.c:157: error: unknown register name '%xmm0' in 'asm'
> }}}
>
> It doesn't actually matter what CFLAGS is set to, it fails even with
> {{{
> $ export CFLAGS=" "
> }}}
>
> This is probably because Sage's CFLAGS overrides ecm's CFLAGS. I think
> the easiest solution is simply not set any CFLAGS in ecm's {{{spkg-
> install}}}. Since ecm really wants to optimize for a particular machine,
> I think the fact that ecm's CFLAGS are not used has also bad consequences
> for speed.
New description:
On the Skynet machine cicero and on a 32-bit Gentoo Linux Pentium D
machine of my own, the ecm package from #5847 does not install in Sage.
The problem is with Sage's {{{spkg-install}}} as the pure upstream sources
in {{{src/}}} work fine.
The following works:
{{{
$ ./configure
$ make
}}}
The following (emulating {{{spkg-install}}}) does NOT work:
{{{
$ export CFLAGS="-g -O3 -fPIC"
$ ./configure
$ make
}}}
It fails with the error
{{{
spv.c: In function 'spv_pwmul':
spv.c:157: error: unknown register name '%xmm7' in 'asm'
spv.c:157: error: unknown register name '%xmm6' in 'asm'
spv.c:157: error: unknown register name '%xmm5' in 'asm'
spv.c:157: error: unknown register name '%xmm3' in 'asm'
spv.c:157: error: unknown register name '%xmm2' in 'asm'
spv.c:157: error: unknown register name '%xmm1' in 'asm'
spv.c:157: error: unknown register name '%xmm0' in 'asm'
}}}
It doesn't actually matter what CFLAGS is set to, it fails even with
{{{
$ export CFLAGS=" "
}}}
This is probably because Sage's CFLAGS overrides ecm's CFLAGS. I think
the easiest solution is simply not set any CFLAGS in ecm's {{{spkg-
install}}}. Since ecm really wants to optimize for a particular machine,
I think the fact that ecm's CFLAGS are not used has also bad consequences
for speed.
----
Actually an upstream bug... (And not setting `CFLAGS` or `CC` is not an
option. There are different ways to let the compiler produce processor-
specific optimized code. Note that this anyway doesn't affect optimized
assembly code, which ECM also comes with.)
'''New spkg (ecm-6.3.p2) fixing this''' (including the upstream patch)
'''at #5847.'''
--
Comment:
Replying to [comment:15 leif]:
> Just for the record: I'll upload a new spkg that also fixes this issue
at #5847 (hopefully) soon...
Did so...
Setting this ticket to "needs review" too, can be closed as duplicate when
#5847 gets a positive review / merged.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10252#comment:22>
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