cython_aliases: Do not fail if one of the listed libraries is not known to pkgconfig

[mkoeppe]

(split out from #30371)

This helps with the modularization effort.

CC: @isuruf @kiwifb @antonio-rojas @collares @tobihan @infinity0

Component: build: configure

Author: Tobias Diez, Matthias Koeppe

Branch/Commit: 3cb8f90

Reviewer: Matthias Koeppe, Jonathan Kliem

Issue created by migration from https://trac.sagemath.org/ticket/31384

[mkoeppe]

Branch: u/mkoeppe/cython_aliases__do_not_fail_if_one_of_the_listed_libraries_is_not_known_to_pkgconfig

[sagetrac-git]

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

dace125

sage.env.cython_aliases: Do not fail if one of the listed libraries is not known to pkgconfig

[sagetrac-git]

Commit: dace125

[mkoeppe]

Reviewer: Matthias Koeppe

[mkoeppe]

comment:4

What did you need this for exactly in #30371?

For modularization we certainly need something like this; but I think when building all modules, with this patch the unresolved cython aliases will just stay as is and cause errors later.

[tobiasdiez]

comment:6

I changed this during my experiments where I tried to have everything work without any previous built sage's packages. So it's not needed for #30371.

[mkoeppe]

comment:7

Thanks! Then I will rework this ticket for the purposes of modularization, making the list of needed libraries an input.

[mkoeppe]

comment:9

Setting new milestone based on a cursory review of ticket status, priority, and last modification date.

[mkoeppe]

comment:10

A version of this is needed for Sage 9.3: Since #29706, cython_aliases insists to find lapack.pc even though no LAPACK_... aliases are used anywhere in src/.
In the Sage distribution, of course, we have that; but it fails for example in conda when testing without build of the Sage distribution.

[mkoeppe]

comment:11

(Related previous ticket: #30706)

[sagetrac-git]

Changed commit from dace125 to 4f42440

[sagetrac-git]

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

4f42440

sage.env.cython_aliases: Do not fail if one of the listed libraries is not known to pkgconfig

[sagetrac-git]

Changed commit from 4f42440 to 3cb8f90

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

3cb8f90

sage.env.cython_aliases: Make module lapack optional; generalize the interface

[mkoeppe]

comment:14

If any changes in cython_aliases would eliminate downstream patching, now would be the time...