From 251c69af0e45936c39e363f9d7ae1eefd8095b3b Mon Sep 17 00:00:00 2001
From: Randy Eckenrode <randy@largeandhighquality.com>
Date: Mon, 13 Nov 2023 18:41:44 -0500
Subject: [PATCH] haskell-modules/generic-builder.nix: work around int
 conversion errors

Work around https://gitlab.haskell.org/ghc/ghc/-/issues/23456. Implicit
pointer to integer conversions have been an error since clang 15.
---
 pkgs/development/haskell-modules/generic-builder.nix | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/pkgs/development/haskell-modules/generic-builder.nix b/pkgs/development/haskell-modules/generic-builder.nix
index 6cfd92fb4307..c840215f9178 100644
--- a/pkgs/development/haskell-modules/generic-builder.nix
+++ b/pkgs/development/haskell-modules/generic-builder.nix
@@ -812,6 +812,12 @@ stdenv.mkDerivation ({
 // optionalAttrs (postPhases != [])              { inherit postPhases; }
 // optionalAttrs (stdenv.buildPlatform.libc == "glibc"){ LOCALE_ARCHIVE = "${glibcLocales}/lib/locale/locale-archive"; }
 
+# Implicit pointer to integer conversions are errors by default since clang 15.
+# Works around https://gitlab.haskell.org/ghc/ghc/-/issues/23456.
+// lib.optionalAttrs stdenv.cc.isClang {
+  NIX_CFLAGS_COMPILE = "-Wno-error=int-conversion";
+}
+
 # Ensure libc++abi is linked even when clang is invoked as just `clang` or `cc`.
 # Works around https://github.com/NixOS/nixpkgs/issues/166205.
 # This can be dropped once a fix has been committed to cc-wrapper.