$NetBSD: patch-libraries_Cabal_Cabal_src_Distribution_Simple_Register.hs,v 1.1 2025/01/29 13:21:53 pho Exp $

Fix a long-standing Cabal bug: when a package to be built contains a
library that has no Haskell modules, "./Setup register" tries to register
the library with fields "haddock-interfaces:" and "haddock-html:" pointing
at non-existent files or directories, and "ghc-pkg register" warns about
them.

wiz@ asked me three times about these suspicious yet harmless warnings and
I kept telling him to just ignore them. I was lazy (as always) and
repeatedly said something like "oh yeah I'll fix it some time in the
future" but now the future has finally come! (pho@)

https://github.com/haskell/cabal/pull/9997

--- libraries/Cabal/Cabal/src/Distribution/Simple/Register.hs.orig	2024-05-10 05:07:46.000000000 +0000
+++ libraries/Cabal/Cabal/src/Distribution/Simple/Register.hs
@@ -541,8 +541,8 @@ generalInstalledPackageInfo adjustRelInc
     , IPI.ldOptions = ldOptions bi
     , IPI.frameworks = frameworks bi
     , IPI.frameworkDirs = extraFrameworkDirs bi
-    , IPI.haddockInterfaces = [haddockdir installDirs </> haddockName pkg]
-    , IPI.haddockHTMLs = [htmldir installDirs]
+    , IPI.haddockInterfaces = [haddockdir installDirs </> haddockName pkg|hasModules]
+    , IPI.haddockHTMLs = [htmldir installDirs|hasModules]
     , IPI.pkgRoot = Nothing
     , IPI.libVisibility = libVisibility lib
     }