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Use brew --prefix command to get library path #93

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Dec 10, 2022
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Use brew --prefix command to get library path #93

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31 changes: 15 additions & 16 deletions openblas-src/build.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -41,24 +41,23 @@ fn windows_msvc_system() {
}
}

/// homebrew says
///
/// > openblas is keg-only, which means it was not symlinked into /usr/local,
/// > because macOS provides BLAS in Accelerate.framework.
/// > For compilers to find openblas you may need to set:
///
/// ```text
/// export LDFLAGS="-L/usr/local/opt/openblas/lib"
/// export CPPFLAGS="-I/usr/local/opt/openblas/include"
/// ```
/// Add linker flag (`-L`) to path where brew installs OpenBLAS
fn macos_system() {
if cfg!(target_arch = "aarch64") {
println!("cargo:rustc-link-search=/opt/homebrew/opt/openblas/lib");
println!("cargo:rustc-link-search=/opt/homebrew/opt/libomp/lib");
} else {
println!("cargo:rustc-link-search=/usr/local/homebrew/opt/openblas/lib");
println!("cargo:rustc-link-search=/usr/local/homebrew/opt/libomp/lib");
fn brew_prefix(target: &str) -> PathBuf {
let out = Command::new("brew")
.arg("--prefix")
.arg(target)
.output()
.expect("brew not installed");
assert!(out.status.success(), "`brew --prefix` failed");
let path = String::from_utf8(out.stdout).expect("Non-UTF8 path by `brew --prefix`");
PathBuf::from(path.trim())
}
let openblas = brew_prefix("openblas");
let libomp = brew_prefix("libomp");

println!("cargo:rustc-link-search={}/lib", openblas.display());
println!("cargo:rustc-link-search={}/lib", libomp.display());
}

fn main() {
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