Jappie has good intentions and seems open to constructive feedback.

He definitely does, but that doesn't make me less caucious of vibe coding

there's a couple packages calling cabal executables in their test suites that I tried to fix with addTestToolDepend self.cabal-install that then fail with

Error: [Cabal-8123]
Use of GHC's environment variable GHC_PACKAGE_PATH is incompatible with Cabal. Use the flag --package-db to specify a package database (it can be used multiple times).

,("Use interpreter","NO")
,("cross compiling","NO")
,("Build platform","riscv64-unknown-linux")
,("Host platform","riscv64-unknown-linux")
,("Target platform","riscv64-unknown-linux")
,("Have interpreter","NO")

Why is my native RISC-V GHC 9.8.4 build missing the TH interpreter and GHCi support?
I've never seen this happen for a native build before, and I can't find anything that explains this in Nixpkgs or Hadrian's source code.

I have an old native 9.6.6 build lying around and it has ("Have interpreter","YES") as expected.
Both were built using Nixpkgs' default settings with a cross-compiled GHC 9.4.8.

alexfmpe: see

• https://github.com/haskell/cabal/issues/2358
• https://github.com/NixOS/nixpkgs/pull/312859
• https://github.com/haskell/cabal/issues/10090

for some context

In reply to @sternenseemann:systemli.org

alexfmpe: see

• https://github.com/haskell/cabal/issues/2358
• https://github.com/NixOS/nixpkgs/pull/312859
• https://github.com/haskell/cabal/issues/10090

for some context

In reply to @sternenseemann:systemli.org
if someone has a lot of spare time they could investigate making an opt in alternative generic-builder.nix code path that uses cabal-install which could have some advantages

Hi
I have very little knowledge when it comes to the general Haskell ecosystem/build process etc - I'm struggling with applying a custom patch via haskell.lib.compose.appendPatch to a package (hledger).
It fails applying the patch, complaining it can't find the file targeted in the patch…

       > applying patch /nix/store/s3f1dgvk0ddzp87sg9j2npb7j7avdanw-imp-add-continue-rule-for-CSV-import.patch
       > can't find file to patch at input line 3
       > Perhaps you used the wrong -p or --strip option?
       > The text leading up to this was:
       > --------------------------
       > |--- a/hledger-lib/Hledger/Read/RulesReader.hs
       > |+++ b/hledger-lib/Hledger/Read/RulesReader.hs
       > --------------------------
       > File to patch:
       > Skip this patch? [y]
       > Skipping patch.

Do I need to do anything special to apply patches to Haskell packages? Couldn't find anything relevant to my problem in the docs.