From 4ce7bc4f9719e22e8b6dd90890a3cfcddbb862b9 Mon Sep 17 00:00:00 2001
From: Matthew Pickering <matthewtpickering@gmail.com>
Date: Fri, 2 Aug 2024 11:47:01 +0100
Subject: [PATCH] Filter out -dinitial-unique and -dunique-increment from hash
 flags

These options shouldn't affect the output of the package and hence
shouldn't affect the store hash of a package.
---
 Cabal/src/Distribution/Simple/Program/GHC.hs |  2 ++
 changelog.d/pr-10240                         | 13 +++++++++++++
 2 files changed, 15 insertions(+)
 create mode 100644 changelog.d/pr-10240

diff --git a/Cabal/src/Distribution/Simple/Program/GHC.hs b/Cabal/src/Distribution/Simple/Program/GHC.hs
index c42eb18e3b1..a0655793792 100644
--- a/Cabal/src/Distribution/Simple/Program/GHC.hs
+++ b/Cabal/src/Distribution/Simple/Program/GHC.hs
@@ -324,6 +324,8 @@ normaliseGhcArgs (Just ghcVersion) PackageDescription{..} ghcArgs
           , "-ddpr-cols"
           , "-dtrace-level"
           , "-fghci-hist-size"
+          , "-dinitial-unique"
+          , "-dunique-increment"
           ]
         , from [8, 2] ["-fmax-uncovered-patterns", "-fmax-errors"]
         , from [8, 4] $ to [8, 6] ["-fmax-valid-substitutions"]
diff --git a/changelog.d/pr-10240 b/changelog.d/pr-10240
new file mode 100644
index 00000000000..9bd05100ab7
--- /dev/null
+++ b/changelog.d/pr-10240
@@ -0,0 +1,13 @@
+synopsis: Filter out dinitial-unique and dunique-increment from package hash
+packages: cabal-install
+prs: #10122
+
+description: {
+
+`-dinitial-unique` and `-dunique-increment` are now filtered out when computing the
+store hash of a package.
+
+These options shouldn't affect the output of the package and hence
+shouldn't affect the store hash of a package.
+
+}