Openblas support on Macosx M1

[poqudrof]

Hello,

I currently struggle with an ugly yet familiar issue, the library cannot load :

UnsatisfiedLinkError: no jniopenblas_nolapack in java.library.path:

I managed to install openblas to the current "stable" version supported by Javacpp presets :  0.3.19, with javaCPP 1.5.7.

With the example code, at version 1.5.7, I get this error (which may not be exactly the same) :

LAPACKE_dgels (row-major, high-level) Example Program Results
[WARNING] 
java.lang.UnsatisfiedLinkError: 'int org.bytedeco.openblas.global.openblas.LAPACKE_dgels(int, byte, int, int, int, double[], int, double[], int)'
    at org.bytedeco.openblas.global.openblas.LAPACKE_dgels (Native Method)
    at ExampleDGELSrowmajor.main (ExampleDGELSrowmajor.java:122)
    at org.codehaus.mojo.exec.ExecJavaMojo$1.run (ExecJavaMojo.java:254)
    at java.lang.Thread.run (Thread.java:833)
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  0.717 s
[INFO] Finished at: 2022-04-14T17:34:49+02:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:3.0.0:java (default-cli) on project openblas: An exception occured while executing the Java class. 'int org.bytedeco.openblas.global.openblas.LAPACKE_dgels(int, byte, int, int, int, double[], int, double[], int)' -> [Help 1]

I use Java 17 and want to work with OpenCV in Processing 4 on my Mac. By default Opencv 4.5.5 on OSX comes with Openblas 0.3.20.

The Openblas_nolapack code does have any macosx-arm64 specific code, so maybe it fails at loading some dependencies ?

It is / was reported to work on OSX there #1069 . I saw the other issues with Openblas there bytedeco/javacv#1435, I guess it is not an easy dependency to work with.

Do you have an idea to solve this ?

Cheers,

Jeremy.

[saudet]

There isn't a Fortran compiler available for that platform, yet, so we can't compile LAPACK, that's normal.

[devjeonghwan]

I'm not sure but, Maybe you can build openblas contains lapack/fortran using below repository.

https://github.com/iains/gcc-darwin-arm64
https://github.com/fxcoudert/gfortran-for-macOS/releases/tag/12-arm-alpha

[poqudrof]

But LAPACK does compile from homebrew, this one did compile fine on my laptop: https://formulae.brew.sh/formula/openblas .

[saudet]

It's possible gfortran is now available, yes. Please give it a try by updating the build script and see what that gives.

[saudet]

Oh, pull OpenMathLib/OpenBLAS#3539 is something interesting that got merged recently. I'll give that a try when 0.3.21 gets released, but contributions are always welcome, so if you make it work before the release, please open a pull request with the necessary changes! Thank you

[poqudrof]

So, after quite some time I am back at it.

I managed to compile the preset for 0.3.20 and JavacCPP 1.5.7 without any code modification.
The problem was my Java version which was only for macosx-x86_64 and not for arm64.

The included example does not work though, impossible to find LAPACK_ROW_MAJOR.

I use the code with Processing, and there is now a Processing version that uses arm64 🥳.

No issue left for me here, it should all go smoothly once the next release is done.
Thanks for the support ! 
Jeremy.

[saudet]

The included example does not work though, impossible to find LAPACK_ROW_MAJOR.

Let's keep this issue open for that.

[saudet]

It's done! With commit 7d9084f LAPACK is now available for ARM on Android, iOS, Mac, etc.
Please give it a try with the snapshots: http://bytedeco.org/builds/

[saudet]

This has now been released with version 1.5.8. Enjoy!