OpenBLAS: add PowerPC support

[kencu]

These patches and the small change to force a newer make on Tiger fix the build of OpenBLAS on PowerPC macs.

It looks like these changes are acceptable to upstream, and these patches should be integrated into the next release of OpenBLAS.

PowerPC forever!

[macportsbot]

Notifying maintainers:
@NicosPavlov for port OpenBLAS.
@michaelld for port OpenBLAS.

[macportsbot]

Travis Build #5526 Errored.

Lint results

--->  Verifying Portfile for OpenBLAS
--->  0 errors and 0 warnings found.

Port OpenBLAS success on xcode10.2. Log
Port OpenBLAS success on xcode9.4. Log
Port OpenBLAS-devel success on xcode9.4. Log
Port OpenBLAS success on xcode8.3. Log
Port OpenBLAS-devel success on xcode8.3. Log
Port OpenBLAS success on xcode7.3. Log

The build timed out.

[macportsbot]

Travis Build #5527 Errored.

Lint results

--->  Verifying Portfile for OpenBLAS
--->  0 errors and 0 warnings found.

Port OpenBLAS success on xcode10.2. Log
Port OpenBLAS success on xcode9.4. Log
Port OpenBLAS-devel success on xcode9.4. Log
Port OpenBLAS success on xcode8.3. Log
Port OpenBLAS's dependencies fail on xcode7.3. Log
Port OpenBLAS-devel's dependencies fail on xcode7.3. Log

The build timed out.

[michaelld]

Thanks for putting these all together, @kencu ! I'll test on my PPC G5 box today & report back. I love that the fixes are so minimal!

[michaelld]

When forcing the correct compiler, these changes work correctly. I'll figure out a change to get the "correct compiler" automatically after this PR is merged.

[michaelld]

"correctly" meaning with no further changes to the Portfile or patches; just the compiler selection.

[michaelld]

My testing was on 10.5 PPC only; I don't have a 10.4 PPC install yet ... so, we can take @kencu's word that it works on his 10.4 PPC install IMHO.

[kencu]

I continue to get gcc6 automatically on two different 10.4 PPC machines and my 10.5 PPC machine. -- I don't have to force any compilers.

Are you running the MacPorts' git devel branch??

[NicosPavlov]

Thanks for following that up. As I have no testing capabilities on PowerPC, I leave it up to you.

[kencu]

$ machine
ppc970

$ uname -a
Darwin tigerg5.local 8.11.0 Darwin Kernel Version 8.11.0: Wed Oct 10 18:26:00 PDT 2007; root:xnu-792.24.17~1/RELEASE_PPC Power Macintosh powerpc

$ port info
OpenBLAS @0.3.5_1 (math, science)
Sub-ports:            OpenBLAS-devel
Variants:             g95, gcc48, gcc49, gcc5, [+]gcc6, gcc7, gcc8, [+]lapack,
                      universal

Description:          OpenBLAS is an optimized BLAS library based on GotoBLAS2
Homepage:             https://github.com/xianyi/OpenBLAS

Build Dependencies:   cctools, gmake, gcc6
Library Dependencies: libgcc, libgcc7, libgcc6, gcc6
Test Dependencies:    gmake
Conflicts with:       OpenBLAS-devel
Platforms:            darwin
License:              BSD
Maintainers:          Email: nicos@macports.org, GitHub: NicosPavlov
                      Email: michaelld@macports.org, GitHub: michaelld
                      Policy: openmaintainer

[michaelld]

{{{
$ machine
ppc970

$ uname -a
Darwin iMac-G5-10-5.local 9.8.0 Darwin Kernel Version 9.8.0: Wed Jul 15 16:57:01 PDT 2009; root:xnu-1228.15.4~1/RELEASE_PPC Power Macintosh

$ port info openblas
OpenBLAS @0.3.5_1 (math, science)
Sub-ports: OpenBLAS-devel
Variants: g95, gcc48, gcc49, gcc5, [+]gcc6, gcc7, gcc8, [+]lapack, universal

Description: OpenBLAS is an optimized BLAS library based on GotoBLAS2
Homepage: https://github.com/xianyi/OpenBLAS

Build Dependencies: cctools, gcc6, clang-7.0
Library Dependencies: libgcc, libgcc7, libgcc6
Conflicts with: OpenBLAS-devel
Platforms: darwin
License: BSD
Maintainers: Email: nicos@macports.org, GitHub: NicosPavlov
Email: michaelld@macports.org, GitHub: michaelld
Policy: openmaintainer
}}}

[michaelld]

I have no special globally configured variants or compilers or other settings. I follow MP git master, and mostly install my own devel ports for testing / verification.

[kencu]

My guess is something might have changed in MP git master then. We can see when you push this -- if the 10.5 PPC buildbot builds it, then we'll know there's an issue in MP git master.

[michaelld]

sounds good. I'm going to go ahead & merge then.

[kencu]

the buildbot picked gcc6 as well, so it must be something in base in git master we need to tweak. Goes without saying that at this point in time base should never be suggesting any clang compiler for PPC.