From d7bd5621acc218907b55dfa7a9add366fb2d9279 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?H=C3=A9cate=20Moonlight?= <hecate+github@glitchbra.in>
Date: Fri, 26 Jan 2024 10:03:03 +0100
Subject: [PATCH] Add -Wunused-packages to the packages

Cabal, Cabal-syntax, cabal-install, cabal-install-solver
---
 Cabal-syntax/Cabal-syntax.cabal                 | 3 +++
 Cabal/Cabal.cabal                               | 5 ++++-
 cabal-install-solver/cabal-install-solver.cabal | 2 ++
 cabal-install/cabal-install.cabal               | 7 ++++++-
 4 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/Cabal-syntax/Cabal-syntax.cabal b/Cabal-syntax/Cabal-syntax.cabal
index bf1f9e3fcfe..c98a50f1628 100644
--- a/Cabal-syntax/Cabal-syntax.cabal
+++ b/Cabal-syntax/Cabal-syntax.cabal
@@ -58,6 +58,9 @@ library
   if impl(ghc >= 8.0) && impl(ghc < 8.8)
     ghc-options: -Wnoncanonical-monadfail-instances
 
+  if impl(ghc >= 8.10)
+    ghc-options: -Wunused-packages
+
   build-tool-depends: alex:alex
 
   exposed-modules:
diff --git a/Cabal/Cabal.cabal b/Cabal/Cabal.cabal
index e6187ce9a18..5583382181d 100644
--- a/Cabal/Cabal.cabal
+++ b/Cabal/Cabal.cabal
@@ -51,7 +51,7 @@ library
   else
     build-depends: unix  >= 2.6.0.0 && < 2.9
 
-  ghc-options: -Wall -fno-ignore-asserts -fwarn-tabs -fwarn-incomplete-uni-patterns -fwarn-incomplete-record-updates
+  ghc-options: -Wall -fno-ignore-asserts -fwarn-tabs -fwarn-incomplete-uni-patterns -fwarn-incomplete-record-updates -Wunused-packages
 
   if impl(ghc >= 8.0)
     ghc-options: -Wcompat -Wnoncanonical-monad-instances
@@ -59,6 +59,9 @@ library
   if impl(ghc >= 8.0) && impl(ghc < 8.8)
     ghc-options: -Wnoncanonical-monadfail-instances
 
+  if impl(ghc >= 8.10)
+    ghc-options: -Wunused-packages
+
   exposed-modules:
     Distribution.Backpack.Configure
     Distribution.Backpack.ComponentsGraph
diff --git a/cabal-install-solver/cabal-install-solver.cabal b/cabal-install-solver/cabal-install-solver.cabal
index fe440a78963..3382d666db4 100644
--- a/cabal-install-solver/cabal-install-solver.cabal
+++ b/cabal-install-solver/cabal-install-solver.cabal
@@ -39,9 +39,11 @@ library
   ghc-options:
     -Wall -Wcompat -Wnoncanonical-monad-instances
     -fwarn-tabs -fwarn-incomplete-uni-patterns
+    -WUnused-packages
 
   if impl(ghc <8.8)
     ghc-options: -Wnoncanonical-monadfail-instances
+
   if impl(ghc >=8.10)
     ghc-options: -Wunused-packages
 
diff --git a/cabal-install/cabal-install.cabal b/cabal-install/cabal-install.cabal
index f842d4d3157..041f2bf52c0 100644
--- a/cabal-install/cabal-install.cabal
+++ b/cabal-install/cabal-install.cabal
@@ -39,9 +39,14 @@ Flag lukko
   manual:       True
 
 common warnings
-    ghc-options: -Wall -Wcompat -Wnoncanonical-monad-instances -Wincomplete-uni-patterns -Wincomplete-record-updates
+    ghc-options: -Wall -Wcompat -Wnoncanonical-monad-instances -Wincomplete-uni-patterns -Wincomplete-record-updates -Wunused-packages
+
     if impl(ghc < 8.8)
       ghc-options: -Wnoncanonical-monadfail-instances
+
+    if impl(ghc >= 8.10)
+      ghc-options: -Wunused-packages
+
     if impl(ghc >=9.0)
       -- Warning: even though introduced with GHC 8.10, -Wunused-packages
       -- gives false positives with GHC 8.10.