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May 15, 2025
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doc: stdlib + external BLAS #165

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24 changes: 22 additions & 2 deletions pages/spec/metapackages.md
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Expand Up @@ -34,12 +34,32 @@ Several pre-built examples can be found in `fpm`'s `example_packages/metapackage

This dependency automatically downloads the latest release of the [fortran-lang standard library](https://stdlib.fortran-lang.org) and adds it to the project as a git dependency.

```{code-block} toml
:emphasize-lines: 2
```toml
name = "with_stdlib"
dependencies.stdlib = "*"
```

Starting with **fpm version 0.12.0**, if both the `stdlib` and `blas` metapackages are enabled, the standard library will be configured to link against the external BLAS/LAPACK implementation provided by the `blas` metapackage.

When this configuration is active, the following preprocessor macros are automatically defined:

* `STDLIB_EXTERNAL_BLAS`
* `STDLIB_EXTERNAL_LAPACK`

These macros disable internal fallback routines in `stdlib` and enable use of the external BLAS/LAPACK library.

To enable this setup:

```toml
[dependencies]
stdlib = "*"
blas = "*"
```

An example is provided in:

[`example_packages/metapackage_stdlib_ext_blas`](https://github.com/fortran-lang/fpm/tree/main/example_packages/metapackage_stdlib_ext_blas)

## fortran-lang MINPACK

This dependency automatically downloads the release v2.0.0-rc1 of the modernized [fortran-lang MINPACK](https://github.com/fortran-lang/minpack) and adds it to the project as a git dependency.
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