Can't run examples - linker errors to blas

[Ploppz]

cargo run --example a2c
-> note: /usr/bin/ld: cannot find -lopenblas

Then I installed openblas instead of blas (Arch Linux). Now it says:

  = note: /usr/bin/ld: /tmp/rsrl/target/debug/deps/liblfa-9d758421e5e2d7cc.rlib(lfa-9d758421e5e2d7cc.lfa.9q6n3def-cgu.1.rcgu.o): in function `ndarray::linalg::impl_linalg::<impl ndarray::ArrayBase<S, ndarray::dimension::dim::Dim<[usize; _]>>>::dot_impl':
          /home/ploppz/.cargo/registry/src/github.com-1ecc6299db9ec823/ndarray-0.12.1/src/linalg/impl_linalg.rs:115: undefined reference to `cblas_sdot'
          /usr/bin/ld: /home/ploppz/.cargo/registry/src/github.com-1ecc6299db9ec823/ndarray-0.12.1/src/linalg/impl_linalg.rs:115: undefined reference to `cblas_ddot'
          /usr/bin/ld: /tmp/rsrl/target/debug/deps/liblfa-9d758421e5e2d7cc.rlib(lfa-9d758421e5e2d7cc.lfa.9q6n3def-cgu.1.rcgu.o): in function `ndarray::linalg::impl_linalg::<impl ndarray::ArrayBase<S, ndarray::dimension::dim::Dim<[usize; _]>>>::dot_impl':
          /home/ploppz/.cargo/registry/src/github.com-1ecc6299db9ec823/ndarray-0.12.1/src/linalg/impl_linalg.rs:115: undefined reference to `cblas_sdot'
          /usr/bin/ld: /home/ploppz/.cargo/registry/src/github.com-1ecc6299db9ec823/ndarray-0.12.1/src/linalg/impl_linalg.rs:115: undefined reference to `cblas_ddot'
          /usr/bin/ld: /tmp/rsrl/target/debug/deps/liblfa-9d758421e5e2d7cc.rlib(lfa-9d758421e5e2d7cc.lfa.9q6n3def-cgu.12.rcgu.o): in function `ndarray::linalg::impl_linalg::mat_mul_impl':
          /home/ploppz/.cargo/registry/src/github.com-1ecc6299db9ec823/ndarray-0.12.1/src/linalg/impl_linalg.rs:422: undefined reference to `cblas_sgemm'
          /usr/bin/ld: /home/ploppz/.cargo/registry/src/github.com-1ecc6299db9ec823/ndarray-0.12.1/src/linalg/impl_linalg.rs:422: undefined reference to `cblas_dgemm'
          collect2: error: ld returned 1 exit status

I tried to disable anything related to blas in Cargo.toml, changed lines look like:

ndarray = { version = "0.12", features = ["serde-1"] }
# ...
blas-src = { version = "0.2", default-features = false, features = [] }
openblas-src = { version = "0.6", default-features = false, features = ["system"] }

But that did not help at all.

[tspooner]

Hey,

So I have also had problems in the past with BLAS. I need to come up with a more robust solution for the end user as it will invariably be a problem in cases.

The specific issues you outline above have not cropped up for me before so I'm a little unsure how to debug. In the past it has been issues around where exactly the BLAS libraries are located on your system. As I typically work on either Ubuntu or Mac OS X, I would be lying if I said I knew how to solve this. Sorry I couldn't be more help but I will do what I can to solve this locally too and let you know. If you find a solution for it in the meantime, please do let me know and I will do what I can to document it and/or come up with a robust solution.

I'd start with looking up errors like this: "undefined reference to `cblas_sgemm'". These are the main issue.

Cheers,
Tom

[Ploppz]

It's a dependency that uses blas, right? Would it be possible to make all dependencies not use blas?

[tspooner]

See #66