fail to build fflas_ffpack on 9.1. beta1

[Vincent Delecroix]

Dear all,

I am experiencing trouble compiling fflas_ffpack (in the sage
compilation process). It is the same error appearing multiple
times related to openblas_set_num_threads being not declared.

Note that I am running archlinux.

Best
Vincent

[Dima Pasechnik]

there was a thread
https://groups.google.com/d/msg/sage-devel/pIOnFyFJMtM/_FbzM2OxCQAJ
just on this 10 days ago.

the system's openblas on Arch is broken, so you'd need to build with
---without-system-openblas

and also it might be related to
https://trac.sagemath.org/ticket/27444#comment:34

On Wed, Jan 22, 2020 at 12:27 PM Vincent Delecroix

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[Vincent Delecroix]

With the option --without-system-openblas, the compilation fails at
openblas with

getarch.c:96: warning: "NO_AVX512" redefined
96 | #define NO_AVX512

(see also attachment)

Vincent

[Vincent Delecroix]

This was not the error (just a warning). Problem is

cp: cannot create regular file
'/opt/sage/local/./lib/pkgconfig/blas.pc': Permission denied
cp: cannot create regular file
'/opt/sage/local/./lib/pkgconfig/cblas.pc': Permission denied
cp: cannot create regular file
'/opt/sage/local/./lib/pkgconfig/lapack.pc': Permission denied

[Vincent Delecroix]

The reason for the error seems to be that the pkgconfig
are pointing to my system pkgconfig (which are of not writable)

$ ls -l /opt/sage/local/lib/pkgconfig/
total 52
lrwxrwxrwx 1 vincent vincent 30 22 janv. 15:59 blas.pc ->
/usr/lib/pkgconfig/openblas.pc
lrwxrwxrwx 1 vincent vincent 30 22 janv. 15:59 cblas.pc ->
/usr/lib/pkgconfig/openblas.pc
lrwxrwxrwx 1 vincent vincent 30 22 janv. 15:59 lapack.pc ->
/usr/lib/pkgconfig/openblas.pc
-rw-r--r-- 1 vincent vincent 517 22 janv. 16:07 openblas.pc
lrwxrwxrwx 1 vincent vincent 13 22 janv. 16:02 python-3.7m.pc ->
python-3.7.pc
lrwxrwxrwx 1 vincent vincent 13 22 janv. 16:02 python3.pc -> python-3.7.pc

[Dima Pasechnik]

On Wed, Jan 22, 2020 at 2:20 PM Vincent Delecroix

<20100.d...@gmail.com> wrote:
>
> The reason for the error seems to be that the pkgconfig
> are pointing to my system pkgconfig (which are of not writable)

I fail to understand how this can happen, unless you modified what we
do with pkg-config.
Since https://trac.sagemath.org/ticket/27827 (already in Sage 8.9)
we prepend SAGE_PKG_CONFIG_PATH, set to SAGE_LOCAL/lib/pkgconfig/ if
if system pkg-config is detected ,
to PKG_CONFIG_PATH and that's where *blas.pc should be installed if
you install OpenBLAS in Sage.

By the way, I hope the problem that you reported is fixed by
https://trac.sagemath.org/ticket/29071
- please test this branch on Arch if you can.

Dima

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[Isuru Fernando]

Permission issue is a different issue. This happens when configure is run the second time.

For example, the following fails

touch foo.pc

chmod -w foo.pc

cp foo.pc bar.pc

cp foo.pc bar.pc

Isuru

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[Dima Pasechnik]

On Fri, Jan 24, 2020 at 12:20 PM Isuru Fernando <isu...@gmail.com> wrote:
>
> Permission issue is a different issue. This happens when configure is run the second time.

right, sorry. I mislead these `/./lib/` as `/.lib/` and thought: "hmm,
this is wrong"...

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