How to build openblas for iOS?

[cblin]

I tried https://github.com/xianyi/OpenBLAS/wiki/How-to-build-OpenBLAS-for-iPhone-iOS-(ARMv8), but it didn't work.

[martin-frbg]

Please post the build log, or at least the error messages you got ?

[cblin]

Hi, @martin-frbg, when I executing the .sh file, the terminal just print this: "make: *** No rule to make target `libs'. Stop.".

[martin-frbg]

Strange. Are you sure that you are executing the .sh in the correct folder ?

[cblin]

I put the .sh file into the unpacked OpenBLAS directory, the same as file "c_check".

[martin-frbg]

Hmm - you should see a "Makefile" there that definitely contains a libs target. Which version are you trying to build - is this with 0.2.20, current "develop" snapshot or some older release ?

[cblin]

I saw "Makefile". I tried 0.2.20 and "develop", both failed with same error message.

[martin-frbg]

Does make clean get any response ?

[cblin]

Log for "make clean" :
make[2]: Nothing to be done for clean'. rm -f x* rm -f *.o openblas_utest make[2]: Nothing to be done for clean'.
( cd INSTALL; /Applications/Xcode.app/Contents/Developer/usr/bin/make clean )
( cd TESTING/LIN; /Applications/Xcode.app/Contents/Developer/usr/bin/make clean )
( cd BLAS/TESTING; /Applications/Xcode.app/Contents/Developer/usr/bin/make -f Makeblat1 clean )
( cd CBLAS/testing; /Applications/Xcode.app/Contents/Developer/usr/bin/make clean )
rm -f *.o
rm -f *.o
rm -f *.o
rm -f core *.o .out x
( cd BLAS/TESTING; /Applications/Xcode.app/Contents/Developer/usr/bin/make -f Makeblat2 clean )
( cd BLAS/SRC; /Applications/Xcode.app/Contents/Developer/usr/bin/make clean )
( cd TESTING/EIG; /Applications/Xcode.app/Contents/Developer/usr/bin/make clean )
rm -f *.o
rm -f .o
rm -f .o
( cd BLAS/TESTING; /Applications/Xcode.app/Contents/Developer/usr/bin/make -f Makeblat3 clean )
( cd CBLAS; /Applications/Xcode.app/Contents/Developer/usr/bin/make clean )
( cd TESTING; rm -f xlin xeig )
rm -f .o
cd src && /Applications/Xcode.app/Contents/Developer/usr/bin/make clean
( cd BLAS; rm -f xblat )
rm -f .o a.out core
( cd SRC; /Applications/Xcode.app/Contents/Developer/usr/bin/make clean )
rm -f .o DEPRECATED/.o
( cd SRC/VARIANTS; /Applications/Xcode.app/Contents/Developer/usr/bin/make clean )
rm -f cholesky/RL/cpotrf.o cholesky/RL/dpotrf.o cholesky/RL/spotrf.o cholesky/RL/zpotrf.o cholesky/TOP/cpotrf.o cholesky/TOP/dpotrf.o cholesky/TOP/spotrf.o cholesky/TOP/zpotrf.o lu/CR/cgetrf.o lu/CR/dgetrf.o lu/CR/sgetrf.o lu/CR/zgetrf.o lu/LL/cgetrf.o lu/LL/dgetrf.o lu/LL/sgetrf.o lu/LL/zgetrf.o lu/REC/cgetrf.o lu/REC/dgetrf.o lu/REC/sgetrf.o lu/REC/zgetrf.o qr/LL/cgeqrf.o qr/LL/dgeqrf.o qr/LL/sgeqrf.o qr/LL/zgeqrf.o qr/LL/sceil.o
LIB/.a
( cd TESTING/MATGEN; /Applications/Xcode.app/Contents/Developer/usr/bin/make clean )
rm -f *.o
( cd LAPACKE; /Applications/Xcode.app/Contents/Developer/usr/bin/make clean )
cd src && /Applications/Xcode.app/Contents/Developer/usr/bin/make clean
rm -f *.o
cd utils && /Applications/Xcode.app/Contents/Developer/usr/bin/make clean
rm -f .o
rm -f src/slauum.o src/clauum.o src/dlauum.o src/zlauum.o src/strtri.o src/dtrtri.o src/ctrtri.o src/ztrtri.o src/spotrf.o src/dpotrf.o src/cpotrf.o src/zpotrf.o src/sgetrf.o src/dgetrf.o src/cgetrf.o src/zgetrf.o src/cgbtrf.o src/cpbtrf.o src/dsytrf_rec2.o src/sgbtrf.o src/ssytrf_rook.o src/zhegst.o src/zsytrf_rec2.o src/cgemmt.o src/dgbtrf.o src/dsytrf_rook.o src/sgemmt.o src/ssytrf_rook_rec2.o src/zhetrf.o src/zsytrf_rook.o src/csytrf.o src/dgemmt.o src/dsytrf_rook_rec2.o src/stgsyl.o src/zhetrf_rec2.o src/zsytrf_rook_rec2.o src/chegst.o src/csytrf_rec2.o src/dtgsyl.o src/strsyl.o src/zhetrf_rook.o src/ztgsyl.o src/chetrf.o src/csytrf_rook.o src/dtrsyl.o src/spbtrf.o src/strsyl_rec2.o src/zhetrf_rook_rec2.o src/ztrsyl.o src/chetrf_rec2.o src/csytrf_rook_rec2.o src/dpbtrf.o src/dtrsyl_rec2.o src/ztrsyl_rec2.o src/chetrf_rook.o src/ctgsyl.o src/ssygst.o src/zgbtrf.o src/zpbtrf.o src/chetrf_rook_rec2.o src/ctrsyl.o src/dsygst.o src/f2c.o src/ssytrf.o src/zgemmt.o src/ctrsyl_rec2.o src/dsytrf.o src/lapack_wrappers.o src/ssytrf_rec2.o src/zsytrf.o test/util.o test/.x
Done.

[martin-frbg]

Alright, so it had already built at least parts of the code. Can you please run the script again now ?

[cblin]

Every time I run "make clean", I got the same log message, maybe nothing built. After "make clean", I ran the script and got the same error message as before.

I am using macOS Sierra 10.12.6.

[martin-frbg]

Unfortunately I do not have iOS (nor macOS) for testing, The error message suggests that there is something wrong with the Makefile, but it is unlikely that you would get the same broken file no matter which version you downloaded. Perhaps the message is just confusing, and it actually built a libopenblas ? (Or if nobody else comes up with a more intelligent idea, try just leaving off the "libs" from the "make" commandline in the script - which would tell it to do a full build)

[cblin]

I tried "make" commandline without "libs", it works, but I can't find the .a file.
compile log.txt

[martin-frbg]

That compile log appears to have come from an entirely different project - building protobuf-2.6.1 with the native compiler or something ?

[martin-frbg]

By the way the instruction in the wiki was copied from #569 - maybe you will find additional information in that issue as it has been updated since then.

[cblin]

Sorry, I made a mistake on executing .sh.
Finally, I compiled the .a library(size is 3M), is it correct? I'll try it tomorrow.
By the way, how to build for armv7? Does armv7 supported?

[martin-frbg]

Not sure if anybody tried this for iOS, but in principle you would only need to replace the ARMV8 in the TARGET entry with ARMV7 (or the appropriate cortexa9/cortexa15 model for somewhat more optimized code, see TargetList.txt for the supported cpu models). If compiling for Android, see the corresponding wiki entry for Android NDK etc.

[martin-frbg]

So, did it work for you ?

[cblin]

Yes, I got ARMV7.a now. Thank you very much.