diff --git a/pkgs/development/compilers/llvm/common/default.nix b/pkgs/development/compilers/llvm/common/default.nix
index 948957a1c7ff..225abc626e42 100644
--- a/pkgs/development/compilers/llvm/common/default.nix
+++ b/pkgs/development/compilers/llvm/common/default.nix
@@ -27,6 +27,7 @@
   officialRelease ? null,
   monorepoSrc ? null,
   version ? null,
+  patchesFn ? lib.id,
   # Allows passthrough to packages via newScope. This makes it possible to
   # do `(llvmPackages.override { <someLlvmDependency> = bar; }).clang` and get
   # an llvmPackages whose packages are overridden in an internally consistent way.
@@ -80,232 +81,7 @@ let
         name = builtins.baseNameOf p;
         path =
           let
-            patches = {
-              "clang/gnu-install-dirs.patch" = [
-                {
-                  before = "14";
-                  path = ../12;
-                }
-                {
-                  after = "19";
-                  path = ../19;
-                }
-              ];
-              "clang/purity.patch" = [
-                {
-                  after = "18";
-                  path = ../18;
-                }
-                {
-                  before = "17";
-                  after = "15";
-                  path = ../15;
-                }
-                {
-                  before = "16";
-                  path = ../12;
-                }
-              ];
-              "clang/aarch64-tblgen.patch" = [
-                {
-                  after = "17";
-                  before = "18";
-                  path = ../17;
-                }
-              ];
-              "lld/add-table-base.patch" = [
-                {
-                  after = "16";
-                  path = ../16;
-                }
-              ];
-              "lld/gnu-install-dirs.patch" = [
-                {
-                  after = "18";
-                  path = ../18;
-                }
-                {
-                  before = "14";
-                  path = ../12;
-                }
-              ];
-              "llvm/gnu-install-dirs.patch" = [
-                {
-                  after = "20";
-                  path = ../20;
-                }
-                {
-                  after = "18";
-                  before = "20";
-                  path = ../18;
-                }
-              ];
-              "llvm/gnu-install-dirs-polly.patch" = [
-                {
-                  after = "20";
-                  path = ../20;
-                }
-                {
-                  before = "20";
-                  after = "18";
-                  path = ../18;
-                }
-                {
-                  before = "18";
-                  after = "14";
-                  path = ../14;
-                }
-              ];
-              "llvm/llvm-lit-cfg-add-libs-to-dylib-path.patch" = [
-                {
-                  before = "17";
-                  after = "15";
-                  path = ../15;
-                }
-                {
-                  after = "17";
-                  path = ../17;
-                }
-              ];
-              "llvm/lit-shell-script-runner-set-dyld-library-path.patch" = [
-                {
-                  after = "18";
-                  path = ../18;
-                }
-                {
-                  after = "16";
-                  before = "18";
-                  path = ../16;
-                }
-              ];
-              "llvm/polly-lit-cfg-add-libs-to-dylib-path.patch" = [
-                {
-                  after = "15";
-                  path = ../15;
-                }
-              ];
-              "libunwind/gnu-install-dirs.patch" = [
-                {
-                  before = "17";
-                  after = "15";
-                  path = ../15;
-                }
-              ];
-              "compiler-rt/X86-support-extension.patch" = [
-                {
-                  after = "15";
-                  path = ../15;
-                }
-                {
-                  before = "15";
-                  path = ../12;
-                }
-              ];
-              "compiler-rt/armv6-scudo-libatomic.patch" = [
-                {
-                  after = "19";
-                  path = ../19;
-                }
-                {
-                  after = "15";
-                  before = "19";
-                  path = ../15;
-                }
-                {
-                  before = "15";
-                  path = ../14;
-                }
-              ];
-              "compiler-rt/armv7l.patch" = [
-                {
-                  before = "15";
-                  after = "13";
-                  path = ../13;
-                }
-              ];
-              "compiler-rt/gnu-install-dirs.patch" = [
-                {
-                  before = "14";
-                  path = ../12;
-                }
-                {
-                  after = "13";
-                  before = "15";
-                  path = ../14;
-                }
-                {
-                  after = "15";
-                  before = "17";
-                  path = ../15;
-                }
-                {
-                  after = "16";
-                  path = ../17;
-                }
-              ];
-              "compiler-rt/darwin-targetconditionals.patch" = [
-                {
-                  after = "13";
-                  path = ../13;
-                }
-              ];
-              "compiler-rt/codesign.patch" = [
-                {
-                  after = "13";
-                  path = ../13;
-                }
-              ];
-              "compiler-rt/normalize-var.patch" = [
-                {
-                  after = "16";
-                  path = ../16;
-                }
-                {
-                  before = "16";
-                  path = ../12;
-                }
-              ];
-              "lldb/procfs.patch" = [
-                {
-                  after = "15";
-                  path = ../15;
-                }
-                {
-                  before = "15";
-                  path = ../12;
-                }
-              ];
-              "lldb/resource-dir.patch" = [
-                {
-                  before = "16";
-                  path = ../12;
-                }
-              ];
-              "openmp/fix-find-tool.patch" = [
-                {
-                  after = "17";
-                  before = "19";
-                  path = ../17;
-                }
-              ];
-              "openmp/run-lit-directly.patch" = [
-                {
-                  after = "16";
-                  path = ../16;
-                }
-                {
-                  after = "14";
-                  before = "16";
-                  path = ../14;
-                }
-              ];
-              "libclc/use-default-paths.patch" = [
-                {
-                  after = "19";
-                  path = ../19;
-                }
-              ];
-            };
+            patches = args.patchesFn (import ./patches.nix);
 
             constraints = patches."${p}" or null;
             matchConstraint =
diff --git a/pkgs/development/compilers/llvm/common/patches.nix b/pkgs/development/compilers/llvm/common/patches.nix
new file mode 100644
index 000000000000..37ba80c349d2
--- /dev/null
+++ b/pkgs/development/compilers/llvm/common/patches.nix
@@ -0,0 +1,226 @@
+{
+  "clang/gnu-install-dirs.patch" = [
+    {
+      before = "14";
+      path = ../12;
+    }
+    {
+      after = "19";
+      path = ../19;
+    }
+  ];
+  "clang/purity.patch" = [
+    {
+      after = "18";
+      path = ../18;
+    }
+    {
+      before = "17";
+      after = "15";
+      path = ../15;
+    }
+    {
+      before = "16";
+      path = ../12;
+    }
+  ];
+  "clang/aarch64-tblgen.patch" = [
+    {
+      after = "17";
+      before = "18";
+      path = ../17;
+    }
+  ];
+  "lld/add-table-base.patch" = [
+    {
+      after = "16";
+      path = ../16;
+    }
+  ];
+  "lld/gnu-install-dirs.patch" = [
+    {
+      after = "18";
+      path = ../18;
+    }
+    {
+      before = "14";
+      path = ../12;
+    }
+  ];
+  "llvm/gnu-install-dirs.patch" = [
+    {
+      after = "20";
+      path = ../20;
+    }
+    {
+      after = "18";
+      before = "20";
+      path = ../18;
+    }
+  ];
+  "llvm/gnu-install-dirs-polly.patch" = [
+    {
+      after = "20";
+      path = ../20;
+    }
+    {
+      before = "20";
+      after = "18";
+      path = ../18;
+    }
+    {
+      before = "18";
+      after = "14";
+      path = ../14;
+    }
+  ];
+  "llvm/llvm-lit-cfg-add-libs-to-dylib-path.patch" = [
+    {
+      before = "17";
+      after = "15";
+      path = ../15;
+    }
+    {
+      after = "17";
+      path = ../17;
+    }
+  ];
+  "llvm/lit-shell-script-runner-set-dyld-library-path.patch" = [
+    {
+      after = "18";
+      path = ../18;
+    }
+    {
+      after = "16";
+      before = "18";
+      path = ../16;
+    }
+  ];
+  "llvm/polly-lit-cfg-add-libs-to-dylib-path.patch" = [
+    {
+      after = "15";
+      path = ../15;
+    }
+  ];
+  "libunwind/gnu-install-dirs.patch" = [
+    {
+      before = "17";
+      after = "15";
+      path = ../15;
+    }
+  ];
+  "compiler-rt/X86-support-extension.patch" = [
+    {
+      after = "15";
+      path = ../15;
+    }
+    {
+      before = "15";
+      path = ../12;
+    }
+  ];
+  "compiler-rt/armv6-scudo-libatomic.patch" = [
+    {
+      after = "19";
+      path = ../19;
+    }
+    {
+      after = "15";
+      before = "19";
+      path = ../15;
+    }
+    {
+      before = "15";
+      path = ../14;
+    }
+  ];
+  "compiler-rt/armv7l.patch" = [
+    {
+      before = "15";
+      after = "13";
+      path = ../13;
+    }
+  ];
+  "compiler-rt/gnu-install-dirs.patch" = [
+    {
+      before = "14";
+      path = ../12;
+    }
+    {
+      after = "13";
+      before = "15";
+      path = ../14;
+    }
+    {
+      after = "15";
+      before = "17";
+      path = ../15;
+    }
+    {
+      after = "16";
+      path = ../17;
+    }
+  ];
+  "compiler-rt/darwin-targetconditionals.patch" = [
+    {
+      after = "13";
+      path = ../13;
+    }
+  ];
+  "compiler-rt/codesign.patch" = [
+    {
+      after = "13";
+      path = ../13;
+    }
+  ];
+  "compiler-rt/normalize-var.patch" = [
+    {
+      after = "16";
+      path = ../16;
+    }
+    {
+      before = "16";
+      path = ../12;
+    }
+  ];
+  "lldb/procfs.patch" = [
+    {
+      after = "15";
+      path = ../15;
+    }
+    {
+      before = "15";
+      path = ../12;
+    }
+  ];
+  "lldb/resource-dir.patch" = [
+    {
+      before = "16";
+      path = ../12;
+    }
+  ];
+  "openmp/fix-find-tool.patch" = [
+    {
+      after = "17";
+      before = "19";
+      path = ../17;
+    }
+  ];
+  "openmp/run-lit-directly.patch" = [
+    {
+      after = "16";
+      path = ../16;
+    }
+    {
+      after = "14";
+      before = "16";
+      path = ../14;
+    }
+  ];
+  "libclc/use-default-paths.patch" = [
+    {
+      after = "19";
+      path = ../19;
+    }
+  ];
+}
diff --git a/pkgs/development/compilers/llvm/default.nix b/pkgs/development/compilers/llvm/default.nix
index 28bfcb703647..c3d31450830e 100644
--- a/pkgs/development/compilers/llvm/default.nix
+++ b/pkgs/development/compilers/llvm/default.nix
@@ -14,6 +14,7 @@
   bootBintoolsNoLibc ? if stdenv.targetPlatform.linker == "lld" then null else pkgs.bintoolsNoLibc,
   bootBintools ? if stdenv.targetPlatform.linker == "lld" then null else pkgs.bintools,
   llvmVersions ? { },
+  patchesFn ? lib.id,
   # Allows passthrough to packages via newScope in ./common/default.nix.
   # This makes it possible to do
   # `(llvmPackages.override { <someLlvmDependency> = bar; }).clang` and get
@@ -74,6 +75,7 @@ let
               gitRelease
               monorepoSrc
               version
+              patchesFn
               ;
           }
           // packageSetArgs # Allow overrides.