Cross compile to CORTEXA9 does not complete

[davmaz]

After make clean, I ran
sudo make BINARY=32 CC=/usr/local/bin/gcc FC=/usr/local/bin/gfortran HOSTCC=gcc TARGET=CORTEXA9

This goes a LONG way forward, but dies on
ar -ru ../libopenblas_cortexa9p-r0.2.19.dev.a samax_k.o samin_k.o smax_k.o smin_k.o isamax_k.o isamin_k.o ismax_k.o ismin_k.o sasum_k.o saxpy_k.o scopy_k.o sdot_k.o sdsdot_k.o dsdot_k.o snrm2_k.o srot_k.o
...
...
zomatcopy_k_rt.o zomatcopy_k_cnc.o zomatcopy_k_rnc.o zomatcopy_k_ctc.o zomatcopy_k_rtc.o zimatcopy_k_cn.o zimatcopy_k_rn.o zimatcopy_k_ct.o zimatcopy_k_rt.o zimatcopy_k_cnc.o zimatcopy_k_rnc.o zimatcopy_k_ctc.o zimatcopy_k_rtc.o zgeadd_k.o zneg_tcopy.o zlaswp_ncopy.o lsame.o scabs1.o dcabs1.o cpuid.o
ar: sgemm_kernel.o: No such file or directory
make[1]: *** [libs] Error 1
make[1]: Leaving directory `/home/dmazzoni/Downloads/OpenBLAS/OpenBLAS-develop/kernel'
make: *** [libs] Error 1

[brada4]

There shpuld be some error before.
Can you attach full build output?
$ make clean
$ make [your params] 2>&1 >>make.log

[martin-frbg]

In non-cross compiling, this fault with sgemm_kernel.o appears to come up when the build system is confused about the type and capabilities of the cpu (wrong combination of arguments supplied to make, or running in an emulator that provides an unusual subset of host cpu features to the virtual machine).
What is your build environment here ?

[davmaz]

Hello all -
Thanks for your suggestions and help. I've got OpenBLAS to cross compile using:

make CC=arm-linux-gnueabihf-gcc FC=arm-linux-gnueabihf-gfortran HOSTCC=gcc TARGET=CORTEXA9

Dave

---

From: Martin Kroeker [[email protected]]
Sent: Friday, July 29, 2016 04:03
To: xianyi/OpenBLAS
Cc: [email protected]; Author
Subject: Re: [xianyi/OpenBLAS] Cross compile to CORTEXA9 does not complete (#936)

In non-cross compiling, this fault with sgemm_kernel.o appears to come up when the build system is confused about the type and capabilities of the cpu (wrong combination of arguments supplied to make, or running in an emulator that provides an unusual subset of host cpu features to the virtual machine).
What is your build environment here ?

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[brada4]

An d who closes this ticket?

[martin-frbg]

Would it make sense to create a wiki entry out of this (I see there is "how to build for android", but no cross-compiling tip that fits davmaz' case) ?

[davmaz]

Yes, that would be nice. I can outline what I did for everything to work (thanks to you).

---

From: Martin Kroeker [[email protected]]
Sent: Thursday, August 04, 2016 08:54
To: xianyi/OpenBLAS
Cc: [email protected]; Author
Subject: Re: [xianyi/OpenBLAS] Cross compile to CORTEXA9 does not complete (#936)

Would it make sense to create a wiki entry out of this (I see there is "how to build for android, but no cross-compiling tip that fits davmaz' case) ?

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[martin-frbg]

I believe the wiki is currently open for anyone here to write.
(btw brada4's not so subtle hint refers to the fact that a ticket can only be closed by its creator or by the project owner - xianyi appears to be pretty busy with other things at the moment and there is a slow but steady buildup of resolved but not closed tickets that threatens to hide the really important open problems.)

[davmaz]

These steps worked:
Find all installed packages for the ARM compiler: sudo aptitude search arm-linux-gnueabi
Purge ALL gnueabi versions: sudo apt-get purge --auto-remove gfortran-arm-linux-gnueabi, etc for any "installed"
Install only gnueabihf versions: sudo aptitude install gfortran-arm-linux-gnueabihf (this also installs gnueabihf gcc)
From the OpenBLAS directory: make CC=arm-linux-gnueabihf-gcc FC=arm-linux-gnueabihf-gfortran HOSTCC=gcc TARGET=CORTEXA9
Install the ARM libs: sudo make PREFIX=/usr/local install

[davmaz]

I put the steps that worked for me in a final comment and closed the issue.
Thanks!

---

From: Martin Kroeker [[email protected]]
Sent: Thursday, August 04, 2016 11:53
To: xianyi/OpenBLAS
Cc: [email protected]; Author
Subject: Re: [xianyi/OpenBLAS] Cross compile to CORTEXA9 does not complete (#936)

I believe the wiki is currently open for anyone here to write.
(btw brada4's not so subtle hint refers to the fact that a ticket can only be closed by its creator or by the project owner - xianyi appears to be pretty busy with other things at the moment and there is a slow but steady buildup of resolved but not closed tickets that threatens to hide the really important open problems.)

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[xianyi]

Add an example for cross compiling ARM.
https://github.com/xianyi/OpenBLAS/wiki/User-Manual#compile