OpenBLAS for Rust

Prerequisites

• gcc
• gfortran

Setup OpenBLAS

• Install OpenBLAS

# Clone
git clone https://github.com/xianyi/OpenBLAS

# Make
cd OpenBLAS && make

# Install to /opt/OpenBLAS
sudo make install

• Add next line to your .bashrc or .zshrc

export LD_LIBRARY_PATH=/opt/OpenBLAS/lib/:$LD_LIBRARY_PATH

Rust build script

• Create build.rs in your project
• Write next code to build.rs

fn main() {
    println!("cargo:rustc-link-search=/opt/OpenBLAS/lib");
    println!("cargo:rustc-link-lib=dylib=gfortran");
    println!("cargo:rustc-link-lib=dylib=openblas");
}

[Important] Link OpenBLAS lib to Rust lib

• Find your rustlib directory
  • In my way, install fd & type command fd -H rustlib
  • In my case, the directory is $HOME/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib
• Follow below codes

# Replace /path/to/rustlib to your rustlib directory
# Replace /your_target your target (In my case, x86_64-unknown-linux-gnu)
cd /path/to/rustlib/your_target/lib

ln -s /opt/OpenBLAS/lib/libopenblas.so $PWD/libopenblas.so
ln -s /opt/OpenBLAS/lib/libopenblas.so.0 $PWD/libopenblas.so.0
ln -s /opt/OpenBLAS/lib/libopenblas.a $PWD/libopenblas.a

Edit Cargo.toml

• I prefer blas (you can choose cblas too, but there are some bugs)

[dependencies]
blas = "0.20"

Invalid H5_VERSION

Error message

--- stderr
thread 'main' panicked at /home/[your_name]/.cargo/registry/src/[directory]/hdf5-sys-0.8.1/build.rs:200:21:
Invalid H5_VERSION: "1.14.3"
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
warning: build failed, waiting for other jobs to finish...

Solution

• Fix build.rs

  let re = Regex::new(r"^(1)\.(8|10|12)\.(\d\d?)(_\d+)?(-patch\d+)?$").ok()?;

  let re = Regex::new(r"^(1)\.(8|10|12|14)\.(\d\d?)(_\d+)?(-patch\d+)?$").ok()?;

• Cargo clean

  cargo clean

• Re-build

  cargo build