numpy fails to build when MKLROOT environment variable is set

[sagetrac-tmonteil]

numpy fails to build on a 40-core 64bit PC running Debian 8. I used sage's gcc (with export SAGE_INSTALL_GCC='yes'). Log attached.

CC: @jdemeyer @kiwifb

Component: packages: standard

Author: Thierry Monteil

Branch/Commit: 5ae04cd

Reviewer: François Bissey

Issue created by migration from https://trac.sagemath.org/ticket/24362

[sagetrac-tmonteil]

comment:1

Attachment: numpy-1.13.3.p0.log

Unfortunately, I can reproduce the issue with make -j1 (i was secretly hoping a race condition).

[sagetrac-tmonteil]

Branch: u/tmonteil/numpy_fails_to_build

[sagetrac-git]

Commit: 5ae04cd

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:

5ae04cd

Trac 24362 : unset MKLROOT environment variable

[sagetrac-tmonteil]

comment:4

Apparently, i found the culprit: MKL blas was installed on the computer, but unsetting MKL is not enough, we also have to unset MKLROOT.

---

New commits:

5ae04cd

Trac 24362 : unset MKLROOT environment variable

[sagetrac-tmonteil]

Author: Thierry Monteil

[kiwifb]

comment:5

Yes numpy is stupid that way. It knows better than your settings unless you disable any other possibility.

[sagetrac-tmonteil]

comment:6

make ptestlong leads to "All tests passed!"

[kiwifb]

comment:7

Looks good to me.

[kiwifb]

Reviewer: François Bissey

[vbraun]

Changed branch from u/tmonteil/numpy_fails_to_build to 5ae04cd