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GHC < 9.6 bindists ship an hsc2hs wrapper with a hardcoded "--lflag=-fuse-ld=gold". Since binutils 2.44 deprecated gold, Ubuntu 25.10 and later no longer include ld.gold in binutils, so hsc2hs fails to link there. Install the separate binutils-gold package via apt-get when ld.gold is missing. This runs before the isInstalled check, so preinstalled or cached GHCs are covered too. Failure to install only emits a warning.
Bodigrim
approved these changes
Nov 12, 2026
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GHC < 9.6 bindists ship an hsc2hs wrapper with a hardcoded
"--lflag=-fuse-ld=gold". Since binutils 2.44 deprecated gold, Ubuntu
25.10 and later no longer include ld.gold in binutils, so hsc2hs fails
to link there. Install the separate binutils-gold package via apt-get
when ld.gold is missing.
This runs before the isInstalled check, so preinstalled or cached GHCs
are covered too. Failure to install only emits a warning.
See https://gitlab.haskell.org/ghc/ghc/-/work_items/26520
Tested on my atomic-write repo.