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Diffstat (limited to 'nix/buildLisp')
| -rw-r--r-- | nix/buildLisp/README.md | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/nix/buildLisp/README.md b/nix/buildLisp/README.md index 02435595ff..214700750d 100644 --- a/nix/buildLisp/README.md +++ b/nix/buildLisp/README.md @@ -224,6 +224,30 @@ This only influences `meta.targets` which is read by depot's CI to check which variants (see "Implementations") of the derivation to build, so it may not be useful outside of depot. +## Influencing the Lisp Runtime + +Lisp implementations which create an executable by dumping an image +usually parse a few implementation-specific command line options on +executable startup that influence runtime settings related to things +like GC. `buildLisp` generates a wrapper which makes sure that this +never interferes with the argument parsing implemented in the actual +application, but sometimes it is useful to run an executable with +special settings. To allow this, the content of `NIX_BUILDLISP_LISP_ARGS` +is passed to the lisp implementation. + +For example, you can make the underlying SBCL print its version for +any executable built with `buildLisp` (and SBCL) like this: + +```console +$ env NIX_BUILDLISP_LISP_ARGS="--version" ./result/bin/🕰️ +SBCL 2.1.2.nixos +``` + +In practice you'd probably want to specify options like +`--dynamic-space-size` or `--tls-limit` (try passing `--help` for a +full list). Naturally, these options are completely different for +different implementations. + [sbcl]: http://www.sbcl.org/ [ccl]: https://ccl.clozure.com/ [ecl]: https://common-lisp.net/project/ecl/ |