GHC team update 45 (#106)

* GHC team update 45

* Update 2025-04-24-ghc-update-45.md

* Update 2025-04-24-ghc-update-45.md

* Update 2025-04-24-ghc-update-45.md

* Update 2025-04-24-ghc-update-45.md

add heap packing

---------

Co-authored-by: Luite Stegeman <[email protected]>

Author: hsyl20

blog/2025-04-24-ghc-update-45.md

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+---
+slug: 2025-04-24-ghc-update
+title: "IOG GHC Update #45"
+authors: [sylvain,luite]
+tags: [ghc,ghc-update]
+---
+
+Triweekly update from the GHC DevX team at IOG.
+
+<!-- truncate -->
+
+Previous updates can be found [here](https://engineering.iog.io/tags/ghc-update).
+
+Sylvain: experimented with using `zig cc` as a C cross-compiler with GHC to build boot libraries. More work is needed to build the embedded libffi.
+
+Luite: worked for the program committee of HIW.
+
+Sylvain: added doc for `interruptible` foreign calling convention with the JS backend. [GHC#24444](https://gitlab.haskell.org/ghc/ghc/-/issues/24444) [GHC!14264](https://gitlab.haskell.org/ghc/ghc/-/merge_requests/14264)
+
+Luite: Working on more efficient packing of heap objects by reordering smaller-than-word fields and reducing the size of tag fields of unboxed sums and unpacked constructors.
+
+Sylvain: opened CLC proposal to remove unused internal module from `base`. [GHC#23432](https://gitlab.haskell.org/ghc/ghc/-/issues/23432) [CLC!329](https://github.com/haskell/core-libraries-committee/issues/329).
+
+Sylvain: fixed [GHC#24058](https://gitlab.haskell.org/ghc/ghc/-/issues/24058) by removing irrelevant "target platform" information returned by `+RTS --info`. [GHC!13967](https://gitlab.haskell.org/ghc/ghc/-/merge_requests/13967)