numpy fails to build (sage 9.2.beta13 on archlinux)

[Vincent Delecroix]

Dear all,

The build process on my machine stopped at numpy. The configure
output and the log are attached.

Best
Vincent

[Dima Pasechnik]

This looks like a failure by numpy to recognise openblas/cblas/lapack
provided by the system.
build/pkgs/openblas/distros/arch.txt says that you need to install
openblas, lapack, and cblas packages.
(our tests might fail to check that all of them are there)

Then it could be that pkg-config setup is broken for some reason. If you fire up
./sage --buildsh
then PKG_CONFIG_PATH should point to SAGE_LOCAL/lib/pkgconfig (and no
other entries)
and
pkg-config --modversion openblas
pkg-config --modversion cblas
pkg-config --modversion lapack

should all return meaningful values.
(Note that the business with these generated *.pc files in
SAGE_LOCAL/lib/pkgconfig is quite fragile - it could be it
got broken again by this update...)


On Wed, Sep 23, 2020 at 9:39 AM Vincent Delecroix

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[Vincent Delecroix]

After the ./configure (and nothing compiled) I got

(sage-buildsh) $ echo ${PKG_CONFIG_PATH}
/opt/sage/local/lib/pkgconfig
(sage-buildsh) $ pkg-config --modversion openblas
0.3.10
(sage-buildsh) $ pkg-config --modversion cblas
3.9.0
(sage-buildsh) $ pkg-config --modversion lapack
3.9.0

Retrying to build after that, it now worked! I don't understand
what changed between the two attempts.

Vincent