Compile bug: OpenBLAS / cmake include path detection

[Awilen-Bernkastel]

Git commit

fa882fd

Operating systems

Other? (Please let us know in description)

GGML backends

CPU, BLAS

Problem description & steps to reproduce

Platform: Android 15 + vanilla Termux

Under Termux, running $ cmake -B build -DGGML_CURL=OFF -DGGML_BLAS=ON -DGGML_BLAS_VENDOR=OpenBLAS wrongly detects the OpenBLAS includes path as /data/data/com.termux/files/usr//data/data/com.termux/files/usr/include/openblas (note the //).

This leads to this include in the compilation commands :
-I/data/data/com.termux/files/usr/data/data/com.termux/files/usr/include/openblas (note the lack //) instead of the correct path.

Executing these commands after running the above command solves the issue and compilation works as intended:

$ sed -i 's:/data/data/com.termux/files/usr/data/data/com.termux/files/usr/include/openblas:/data/data/com.termux/files/usr/include/openblas:g' ./build/compile_commands.json

$ sed -i 's:/data/data/com.termux/files/usr/data/data/com.termux/files/usr/include/openblas:/data/data/com.termux/files/usr/include/openblas:g' ./build/ggml/src/ggml-blas/CMakeFiles/ggml-blas.dir/flags.make

I have a feeling this is a Termux and/or CMake issue rather than a llama.cpp issue, but I'd rather start from the starting point and go from there.

First Bad Commit

No response

Compile command

cmake -B build -DGGML_CURL=OFF -DGGML_BLAS=ON -DGGML_BLAS_VENDOR=OpenBLAS

cmake --build build --config Release -j 6

Relevant log output

Something akin to cblas.h: File not found, which led to finding the relevant paths above.

[taronaeo]

Can you try using the compile flag -DBLAS_ROOT=/path/to/openblas?

[Awilen-Bernkastel]

Just tried using -DBLAS_ROOT=/data/data/com.termux/files/usr/include/openblas as well as -DGGML_BLAS_ROOT=/same/path for good measure, and they both leave me with the same misdetection for the OpenBLAS includes directory, and compilation failure on

/data/data/com.termux/files/home/Documents/llama.cpp/ggml/src/ggml-blas/ggml-blas.cpp:18:13: fatal error:
       'cblas.h' file not found 
    18 | #   include <cblas.h>
       |             ^~~~~~~~~

Relevant output from the command:

cmake -B build -DGGML_CURL=OFF -DGGML_BLAS=ON -DGGML_BLAS_VENDOR=OpenBLAS -DBLAS_ROOT=/data/data/com.termux/files/usr/include/openblas

-- Found BLAS: /data/data/com.termux/files/usr/lib/libopenblas.so
-- BLAS found, Libraries: /data/data/com.termux/files/usr/lib/libopenblas.so

...

-- Checking for module 'openblas'
--   Found openblas, version 0.3.30
-- BLAS found, Includes: /data/data/com.termux/files/usr//data/data/com.termux/files/usr/include/openblas

[taronaeo]

Interesting, I've had a similar issue previously. Can you check the following?

1. ldconfig -p | grep blas - what does this give you?
2. Is your OpenBLAS compiled from source or installed from apt or dnf?
3. ls -laR /data/data/com.termux/files/usr/lib | grep blas - what does this give you?

The issue I had previously was that the repository-installed OpenBLAS did not ship cblas.h and I had to compile OpenBLAS from source to bring that out. Might be good to check if you have installed the development version of OpenBLAS as well.

[Awilen-Bernkastel]

1. Termux does not have ldconfig
2. OpenBLAS has been installed with Termux' package manager, pkg, which is a derivative of apt $ pkg i blas-openblas

$ ls -laR /data/data/com.termux/files/usr/lib | grep blas
lrwxrwxrwx. 1 u0_a535 u0_a535 13         Oct 9 11:16 libblas.a -> libopenblas.a
lrwxrwxrwx. 1 u0_a535 u0_a535 14         Oct 9 11:16 libblas.so -> libopenblas.so
lrwxrwxrwx. 1 u0_a535 u0_a535 14         Oct 9 11:16 libblas.so.3 -> libopenblas.so
lrwxrwxrwx. 1 u0_a535 u0_a535 13         Oct 9 11:16 libcblas.a -> libopenblas.a
lrwxrwxrwx. 1 u0_a535 u0_a535 14         Oct 9 11:16 libcblas.so -> libopenblas.so
lrwxrwxrwx. 1 u0_a535 u0_a535 14         Oct 9 11:16 libcblas.so.3 -> libopenblas.so
-rw-------. 1 u0_a535 u0_a535 5593104    Sep 9 16:27 libclblast.so
lrwxrwxrwx. 1 u0_a535 u0_a535 13         Oct 9 11:16 liblapack.a -> libopenblas.a
lrwxrwxrwx. 1 u0_a535 u0_a535 14         Oct 9 11:16 liblapack.so -> libopenblas.so
lrwxrwxrwx. 1 u0_a535 u0_a535 14         Oct 9 11:16 liblapack.so.3 -> libopenblas.so
lrwxrwxrwx. 1 u0_a535 u0_a535 13         Oct 9 11:16 liblapacke.a -> libopenblas.a
lrwxrwxrwx. 1 u0_a535 u0_a535 14         Oct 9 11:16 liblapacke.so -> libopenblas.so
lrwxrwxrwx. 1 u0_a535 u0_a535 14         Oct 9 11:16 liblapacke.so.3 -> libopenblas.so
-rw-------. 1 u0_a535 u0_a535 10123568   Sep 11 01:04 libopenblas.so
lrwxrwxrwx. 1 u0_a535 u0_a535 11         Oct 9 11:16 blas.pc -> openblas.pc
lrwxrwxrwx. 1 u0_a535 u0_a535 11         Oct 9 11:16 cblas.pc -> openblas.pc
-rw-------. 1 u0_a535 u0_a535 369        Sep 9 16:27 clblast.pc
lrwxrwxrwx. 1 u0_a535 u0_a535 11         Oct 9 11:16 lapack.pc -> openblas.pc
lrwxrwxrwx. 1 u0_a535 u0_a535 11         Oct 9 11:16 lapacke.pc -> openblas.pc
-rw-------. 1 u0_a535 u0_a535 585        Sep 11 01:04 openblas.pc
-rw-------. 1 u0_a535 u0_a535 18190      Feb 26 2025 _blas_subroutines.h
-rwx--x--x. 1 u0_a535 u0_a535 723993     Feb 26 2025 _[fblas.cpython-312.so](http://fblas.cpython-312.so/)
-rw-------. 1 u0_a535 u0_a535 11685      Feb 26 2025 blas.py
-rwx--x--x. 1 u0_a535 u0_a535 398097     Feb 26 2025 [cython_blas.cpython-312.so](http://cython_blas.cpython-312.so/)
-rw-------. 1 u0_a535 u0_a535 15592      Feb 26 2025 cython_blas.pxd
-rw-------. 1 u0_a535 u0_a535 65302      Feb 26 2025 cython_blas.pyx
-rw-------. 1 u0_a535 u0_a535 11729      Feb 26 2025 blas.cpython-312.pyc
-rw-------. 1 u0_a535 u0_a535 40842      Feb 26 2025 test_blas.py
-rw-------. 1 u0_a535 u0_a535 4087       Feb 26 2025 test_cython_blas.py
-rw-------. 1 u0_a535 u0_a535 18687      Feb 26 2025 test_fblas.py
-rw-------. 1 u0_a535 u0_a535 61578      Feb 26 2025 test_blas.cpython-312.pyc
-rw-------. 1 u0_a535 u0_a535 9129       Feb 26 2025 test_cython_blas.cpython-312.pyc
-rw-------. 1 u0_a535 u0_a535 26956      Feb 26 2025 test_fblas.cpython-312.pyc
-rw-------. 1 u0_a535 u0_a535 10462177   Feb 26 2025 libopenblas-df2cef54.so
-rw-------. 1 u0_a535 u0_a535 1548       Feb 26 2025 libopenblas-LICENSE

cblas.h is in /data/data/com.termux/files/usr/include/openblas