#12830: Improve handling of CFLAGS in GMP-ECM's spkg-install
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Reporter: leif
| Owner: leif
Type: enhancement
| Status: needs_review
Priority: major
| Milestone: sage-5.0
Component: packages
| Resolution:
Keywords: spkg -march=native assembler error Darwin MacOS __GMP_CFLAGS
__MPIR_CFLAGS gmp.h | Work issues:
Report Upstream: N/A
| Reviewers:
Authors: Leif Leonhardy
| Merged in:
Dependencies:
| Stopgaps:
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Comment (by leif):
Replying to [comment:4 jdemeyer]:
> Concerning `march=native`: what do you think about using `testcflags.sh`
for this? Let's add
> {{{
> unsigned long fancy_insns() { return (unsigned long) d; }
> }}}
> to the program that `testcflags.sh` uses to check flags.
>
> Then we could do something like
> {{{
> if testcflags.sh -march=native >/dev/null; then
> CFLAGS="-march=native $CFLAGS"
> elif testcflags.sh "-march=native -mno-avx" >/dev/null; then
> echo >&2 "Warning bla bla"
> CFLAGS="-march=native -mno-avx $CFLAGS"
> fi
Probably. Although `testcflags.sh` is currently broken... ;-)
I'm not sure if we should do such a complicated test whenever some
arbitrary compiler flag is to be tested. We'd never know whether the
compiler, the assembler or the linker caused an error.
Using it again requires newer versions of Sage for little reason, which I
don't like in general.
`testcflags.sh` might have an option to not use `CFLAGS` btw.; otherwise
one would have to `(unset CFLAGS; testcflags.sh ...)` or specifically
construct `CFLAGS` for the desired purpose.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12830#comment:7>
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