Expose MKL linkage, fixes segfaults with lapack crate.

Cargo.toml

@@ -24,7 +24,8 @@ changelog = "CHANGELOG.md"
 
 [features]
 accelerate = ["accelerate-src"]
-intel-mkl = ["intel-mkl-src"]
+intel-mkl = ["intel-mkl-src/mkl-static-lp64-iomp"]
+intel-mkl-seq = ["intel-mkl-src/mkl-static-lp64-seq"]
 netlib = ["netlib-src"]
 openblas = ["openblas-src"]
 r = ["r-src"]
@@ -47,4 +48,4 @@ optional = true
 
 [dependencies.r-src]
 version = "0.2.1"
-optional = true
+optional = true

README.md

@@ -26,6 +26,13 @@ lapack-src = { version = "0.12", features = ["openblas"] }
 lapack-src = { version = "0.12", features = ["r"] }
 ```
 
+### Intel MKL Configuration
+
+The `intel-mkl` feature will *statically* link the *sequential LP64* version of
+the MKL library. To link other versions of the library, check the `intel-mkl-*-*-*`
+features inside this crate, which are analogous to the feature flags of
+the [`intel-mkl-src` crate] (https://crates.io/crates/intel-mkl-src).
+
 ## Contribution
 
 Your contribution is highly appreciated. Do not hesitate to open an issue or a

src/lib.rs

@@ -22,6 +22,15 @@
 //! lapack-src = { version = "0.12", features = ["openblas"] }
 //! lapack-src = { version = "0.12", features = ["r"] }
 //! ```
+//! ### Configuring MKL
+//!
+//! When the `intel-mkl` feature is selected, then the parallel version of
+//! MKL using OpenMP is _statically_ linked. To link the sequential version
+//! use the `intel-mkl-seq` feature. In both cases, the
+//! [LP64 interface](https://www.intel.com/content/www/us/en/docs/onemkl/developer-guide-linux/2023-0/using-the-ilp64-interface-vs-lp64-interface.html)
+//! is linked. If other linkage options for MKL are desired, omit `lapack-src`
+//! as a dependency and use the [`intel-mkl-src`](https://crates.io/crates/intel-mkl-src)
+//! crate directly with the appropriate feature flags.
 //!
 //! [architecture]: https://blas-lapack-rs.github.io/architecture
 //! [lapack]: https://en.wikipedia.org/wiki/LAPACK
@@ -37,7 +46,7 @@
 #[cfg(feature = "accelerate")]
 extern crate accelerate_src as raw;
 
-#[cfg(feature = "intel-mkl")]
+#[cfg(any(feature = "intel-mkl", feature = "intel-mkl-seq"))]
 extern crate intel_mkl_src as raw;
 
 #[cfg(feature = "netlib")]