Openblas: initial package draft

[bhack]

Maintainer: me
Compile tested: (mips 24kec, 19.07.2)
Run tested: (none)

Description:
Iinitial stub for Openblas. It could be also useful to accelerate Numpy package if recovered at #9797 (comment)

/cc @brada4

[bhack]

@brada4 I don't know how we could be handle TARGET= that is requested to cross-compile Openblas in openwrt.

[commodo]

it's a good idea to point to release tarballs, unless impossible;
from what i can tell, that should be doable for this repo;
but i am a bit confused about the official tarball for this package;
you are pointing to https://github.com/martin-frbg/OpenBLAS.git officially it's another repo;

if you need patches from that repo, pick them out and put them in the patches sub-folder of the package;

[bhack]

Cause I was working on a specific PR to test in docker run --rm -it openwrtorg/sdk:ramips-mt76x8-19.07.2.
See OpenMathLib/OpenBLAS#2565

[commodo]

do you intend to support openblas only for MIPS24K?
if so, maybe you should limit the depends a bit;
example how to do it per-arch: DEPENDS:=@(i386||x86_64||arm||armeb||aarch64||powerpc||mips||mipsel)
you can probably just put mips

though it may make sense to try to target all archs if possible [somehow]
otherwise, a package [like this] may not make sense for just 1 arch

[bhack]

I want to build for all the archs.
24K Is the one that I am interesting to compile on with docker run --rm -it openwrtorg/sdk:ramips-mt76x8-19.07.2.
The issue Is that Openblas for cross-compiling requires TARGET as you can see from https://github.com/xianyi/OpenBLAS/blob/develop/README.md#cross-compile.
And for TARGET we need to use a value from this list

[commodo]

hmm; so openblas makes sense maybe after numpy is added;
until then we can review it;

[bhack]

hmm; so openblas makes sense maybe after numpy is added;
until then we can review it;

Yes see https://numpy.org/doc/1.18/user/building.html#accelerated-blas-lapack-libraries

[bhack]

@commodo ARCH is landing mipsel but openblas wants mips. I think is correct mips as I see in https://www.mips.com/develop/linux/.
Why we have that set to mipsel?

[bhack]

Also I don't know how we could dynamically handle the required TARGET to set in MAKE_VARS.
See OpenMathLib/OpenBLAS#2570

[brada4]

we can alias mipsel to openblas mips if that helps to streamline the process here???

[commodo]

let's get ready with this:
#12404

we can take a look at this afterwards;

[commodo]

this will be superseded by #15685

[bhack]

Thanks