Bug#1125010: haskell-primitive-unaligned is FTBFS with Error: [Cabal-7554] can't find source for Data/Primitive/Unaligned/Mach

[Trupti]

On 2026-01-08 15:09, Trupti wrote:
> Source: haskell-primitive-unaligned
> Version:  0.1.1.2-6
> Severity: serious
> tags : FTBFS
> User: debian-powerpc at lists.debian.org
> Usertags: ppc64el
> X-Debbugs-Cc: debian-powerpc at lists.debian.org
> 
> 
> Dear Maintainer,
> 
> haskell-primitive-unaligned is failed to build on ppc64el with below 
> error:
> 
> Preprocessing library for primitive-unaligned-0.1.1.2...
> Error: [Cabal-7554]
> can't find source for Data/Primitive/Unaligned/Mach in src,
> dist-ghc/build/autogen, dist-ghc/build/global-autogen
> 
> dh_auto_build: error: debian/hlibrary.setup build --builddir=dist-ghc
> --jobs=8 returned exit code 1
> make: *** [debian/rules:8: binary-arch] Error 25
> dpkg-buildpackage: error: debian/rules binary-arch subprocess failed
> with exit status 2
> 
> Below is build log for reference:
> 
> https://buildd.debian.org/status/fetch.php?pkg=haskell-primitive-unaligned&arch=ppc64el&ver=0.1.1.2-6&stamp=1767648033&raw=0
> 
> 
> Thanks,
> Trupti




Hello,


The build fails because the Cabal file always tells the compiler to look 
in the src directory for source files.On 64-bit systems like ppc64el, 
the actual source files are in src-64, not in src.

Because of this, Cabal cannot find Data.Primitive.Unaligned.Mach, even 
though the file exists.
This worked previously and is now exposed by newer Cabal (3.12) / GHC 
9.10.
The fix is to move hs-source-dirs entirely into an if/else block 
selecting src-64 vs src-32.sing an if/else block in the Cabal file.

Thanks,
Trupti.