8000 BUG: BLAS detection assumes Debian/Ubuntu specific changes with unknown symbol from cblas · Issue #25028 · numpy/numpy · GitHub
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BUG: BLAS detection assumes Debian/Ubuntu specific changes with unknown symbol from cblas #25028

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s-t-e-v-e-n-k opened this issue Oct 30, 2023 · 3 comments · Fixed by #25055
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BUG: BLAS detection assumes Debian/Ubuntu specific changes with unknown symbol from cblas #25028

s-t-e-v-e-n-k opened this issue Oct 30, 2023 · 3 comments · Fixed by #25055
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00 - Bug
Milestone
1.26.2 release

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@s-t-e-v-e-n-k
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Describe the issue:

Building NumPy 1.26.1 on openSUSE results in a module that builds fine, but when importing it results in an unknown symbol:

[  234s] ImportError: 
[  234s] 
[  234s] IMPORTANT: PLEASE READ THIS FOR ADVICE ON HOW TO SOLVE THIS ISSUE!
[  234s] 
[  234s] Importing the numpy C-extensions failed. This error can happen for
[  234s] many reasons, often due to issues with your setup or how NumPy was
[  234s] installed.
[  234s] 
[  234s] We have compiled some common reasons and troubleshooting tips at:
[  234s] 
[  234s]     https://numpy.org/devdocs/user/troubleshooting-importerror.html
[  234s] 
[  234s] Please note and check the following:
[  234s] 
[  234s]   * The Python version is: Python3.9 from "/usr/bin/python3.9"
[  234s]   * The NumPy version is: "1.26.1"
[  234s] 
[  234s] and make sure that they are the versions you expect.
[  234s] Please carefully study the documentation linked above for further help.
[  234s] 
[  234s] Original error was: /home/abuild/rpmbuild/BUILDROOT/python-numpy-1.26.1-0.x86_64/usr/lib64/python3.9/site-packages/numpy/core/_multiarray_umath.cpython-39-x86_64-linux-gnu.so: undefined symbol: cblas_sgemm

I think this is because of a Debian-specific change, in /usr/share/doc/libblas-dev/README.if-you-look-for-libcblas.so.3:

Debian science team maintainers have merged the CBLAS ABI into
the libblas.so shared object. Everything you need from libcblas.so
can be found in libblas.so . Please link your program against it
instead.

Due to that change, linking against -lblas is absolutely fine, and works -- it's currently passing in your CI. However, other distributions are likely not doing the same. I can probably work around this by using blas-order=cblas, but I also thought I'd make you aware of that distribution-specific change as well.

Reproduce the code example:

<None required>

Error message:

No response

Runtime information:

NumPy 1.26.1
openSUSE Tumbleweed 20231026

Context for the issue:

No response
@rgommers rgommers added this to the 1.26.2 release milestone Oct 31, 2023
@rgommers
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Thank you for the report @s-t-e-v-e-n-k. You are completely correct, I was unaware that Debian did this and hence relied on a CI job to test Netlib BLAS that didn't cover the split libblas/libcblas situation. We'll get this fixed soon and backported for 1.26.2.

@rgommers
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@s-t-e-v-e-n-k I'm building a CI job based on the opensuse/tumbleweed Docker container, and it looks like for BLAS there isn't a pkg-config file installed - is that right?

I used this to install the system dependencies:

zypper install -y git gcc-c++ python3-pip python3-devel lapack pkgconf-pkg-config

@s-t-e-v-e-n-k
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Sadly, yes. It's being worked on. You'll need lapack-devel as well, but the lack of .pc files is known.

@rgommers rgommers mentioned this issue Nov 2, 2023
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@charris charris mentioned this issue Nov 11, 2023
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BLD: improve detection of Netlib libblas/libcblas/liblapack rgommers/numpy
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