Merge pull request #303948 from ExpidusOS/feat/llvm-git-commonify-clang

llvmPackages_{12,13,14,15,16,17,18,git}: use common clang

15 files changed, 206 insertions, 867 deletions

diff --git a/pkgs/development/compilers/llvm/12/clang/default.nix b/pkgs/development/compilers/llvm/12/clang/default.nix
deleted file mode 100644
index c482a8ee6875..000000000000
--- a/pkgs/development/compilers/llvm/12/clang/default.nix
+++ /dev/null
@@ -1,132 +0,0 @@
-{ lib, stdenv, llvm_meta, fetch, substituteAll, cmake, libxml2, libllvm, version, clang-tools-extra_src, python3
-, buildLlvmTools
-, fixDarwinDylibNames
-, enableManpages ? false
-}:
-
-let
-  self = stdenv.mkDerivation ({
-    pname = "clang";
-    inherit version;
-
-    src = fetch "clang" "0px4gl27az6cdz6adds89qzdwb1cqpjsfvrldbz9qvpmphrj34bf";
-    inherit clang-tools-extra_src;
-
-    unpackPhase = ''
-      unpackFile $src
-      mv clang-* clang
-      sourceRoot=$PWD/clang
-      unpackFile ${clang-tools-extra_src}
-      mv clang-tools-extra-* $sourceRoot/tools/extra
-      substituteInPlace $sourceRoot/tools/extra/clangd/quality/CompletionModel.cmake \
-        --replace ' ''${CMAKE_SOURCE_DIR}/../clang-tools-extra' ' ''${CMAKE_SOURCE_DIR}/tools/extra'
-    '';
-
-    nativeBuildInputs = [ cmake python3 ]
-      ++ lib.optional enableManpages python3.pkgs.sphinx
-      ++ lib.optional stdenv.hostPlatform.isDarwin fixDarwinDylibNames;
-
-    buildInputs = [ libxml2 libllvm ];
-
-    cmakeFlags = [
-      "-DCLANGD_BUILD_XPC=OFF"
-      "-DLLVM_ENABLE_RTTI=ON"
-    ] ++ lib.optionals enableManpages [
-      "-DCLANG_INCLUDE_DOCS=ON"
-      "-DLLVM_ENABLE_SPHINX=ON"
-      "-DSPHINX_OUTPUT_MAN=ON"
-      "-DSPHINX_OUTPUT_HTML=OFF"
-      "-DSPHINX_WARNINGS_AS_ERRORS=OFF"
-    ] ++ lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
-      "-DLLVM_TABLEGEN_EXE=${buildLlvmTools.llvm}/bin/llvm-tblgen"
-      "-DCLANG_TABLEGEN=${buildLlvmTools.libclang.dev}/bin/clang-tblgen"
-    ];
-
-    patches = [
-      ./purity.patch
-      # https://reviews.llvm.org/D51899
-      ./gnu-install-dirs.patch
-      (substituteAll {
-        src = ../../common/clang/clang-11-15-LLVMgold-path.patch;
-        libllvmLibdir = "${libllvm.lib}/lib";
-      })
-    ];
-
-    postPatch = ''
-      sed -i -e 's/DriverArgs.hasArg(options::OPT_nostdlibinc)/true/' \
-             -e 's/Args.hasArg(options::OPT_nostdlibinc)/true/' \
-             lib/Driver/ToolChains/*.cpp
-    '' + lib.optionalString stdenv.hostPlatform.isMusl ''
-      sed -i -e 's/lgcc_s/lgcc_eh/' lib/Driver/ToolChains/*.cpp
-    '';
-
-    outputs = [ "out" "lib" "dev" "python" ];
-
-    postInstall = ''
-      ln -sv $out/bin/clang $out/bin/cpp
-
-      # Move libclang to 'lib' output
-      moveToOutput "lib/libclang.*" "$lib"
-      moveToOutput "lib/libclang-cpp.*" "$lib"
-      substituteInPlace $out/lib/cmake/clang/ClangTargets-release.cmake \
-          --replace "\''${_IMPORT_PREFIX}/lib/libclang." "$lib/lib/libclang." \
-          --replace "\''${_IMPORT_PREFIX}/lib/libclang-cpp." "$lib/lib/libclang-cpp."
-
-      mkdir -p $python/bin $python/share/{clang,scan-view}
-      mv $out/bin/{git-clang-format,scan-view} $python/bin
-      if [ -e $out/bin/set-xcode-analyzer ]; then
-        mv $out/bin/set-xcode-analyzer $python/bin
-      fi
-      mv $out/share/clang/*.py $python/share/clang
-      mv $out/share/scan-view/*.py $python/share/scan-view
-      rm $out/bin/c-index-test
-      patchShebangs $python/bin
-
-      mkdir -p $dev/bin
-      cp bin/clang-tblgen $dev/bin
-    '';
-
-    passthru = {
-      inherit libllvm;
-      isClang = true;
-      hardeningUnsupportedFlags = [ "fortify3" "zerocallusedregs" ];
-    };
-
-    meta = llvm_meta // {
-      homepage = "https://clang.llvm.org/";
-      description = "A C language family frontend for LLVM";
-      longDescription = ''
-        The Clang project provides a language front-end and tooling
-        infrastructure for languages in the C language family (C, C++, Objective
-        C/C++, OpenCL, CUDA, and RenderScript) for the LLVM project.
-        It aims to deliver amazingly fast compiles, extremely useful error and
-        warning messages and to provide a platform for building great source
-        level tools. The Clang Static Analyzer and clang-tidy are tools that
-        automatically find bugs in your code, and are great examples of the sort
-        of tools that can be built using the Clang frontend as a library to
-        parse C/C++ code.
-      '';
-      mainProgram = "clang";
-    };
-  } // lib.optionalAttrs enableManpages {
-    pname = "clang-manpages";
-
-    buildPhase = ''
-      make docs-clang-man
-    '';
-
-    installPhase = ''
-      mkdir -p $out/share/man/man1
-      # Manually install clang manpage
-      cp docs/man/*.1 $out/share/man/man1/
-    '';
-
-    outputs = [ "out" ];
-
-    doCheck = false;
-
-    meta = llvm_meta // {
-      description = "man page for Clang ${version}";
-    };
-  });
-in self
diff --git a/pkgs/development/compilers/llvm/12/default.nix b/pkgs/development/compilers/llvm/12/default.nix
index 7bd82c071538..0d9202df8aee 100644
--- a/pkgs/development/compilers/llvm/12/default.nix
+++ b/pkgs/development/compilers/llvm/12/default.nix
@@ -1,6 +1,6 @@
 { lowPrio, newScope, pkgs, lib, stdenv, cmake
 , preLibcCrossHeaders
-, substitute, fetchFromGitHub, fetchpatch
+, substitute, substituteAll, fetchFromGitHub, fetchpatch
 , libxml2, python3, isl, fetchurl, overrideCC, wrapCCWith, wrapBintoolsWith
 , buildLlvmTools # tools, but from the previous stage, for cross
 , targetLlvmLibraries # libraries, but from the next stage, for cross
@@ -56,7 +56,7 @@ let
     then tools.bintools
     else bootBintools;
 
-  in {
+  in rec {
 
     libllvm = callPackage ./llvm {
       inherit llvm_meta;
@@ -66,7 +66,17 @@ let
     # we need to reintroduce `outputSpecified` to get the expected behavior e.g. of lib.get*
     llvm = tools.libllvm;
 
-    libclang = callPackage ./clang {
+    libclang = callPackage ../common/clang {
+      src = fetch "clang" "0px4gl27az6cdz6adds89qzdwb1cqpjsfvrldbz9qvpmphrj34bf";
+      patches = [
+        ./clang/purity.patch
+        # https://reviews.llvm.org/D51899
+        ./clang/gnu-install-dirs.patch
+        (substituteAll {
+          src = ../common/clang/clang-11-15-LLVMgold-path.patch;
+          libllvmLibdir = "${libllvm.lib}/lib";
+        })
+      ];
       inherit clang-tools-extra_src llvm_meta;
     };
 
diff --git a/pkgs/development/compilers/llvm/13/clang/default.nix b/pkgs/development/compilers/llvm/13/clang/default.nix
deleted file mode 100644
index 2d02ffb60b36..000000000000
--- a/pkgs/development/compilers/llvm/13/clang/default.nix
+++ /dev/null
@@ -1,126 +0,0 @@
-{ lib, stdenv, llvm_meta, src, substituteAll, cmake, libxml2, libllvm, version, python3
-, buildLlvmTools
-, fixDarwinDylibNames
-, enableManpages ? false
-}:
-
-let
-  self = stdenv.mkDerivation ({
-    pname = "clang";
-    inherit version;
-
-    inherit src;
-    sourceRoot = "${src.name}/clang";
-
-    nativeBuildInputs = [ cmake python3 ]
-      ++ lib.optional enableManpages python3.pkgs.sphinx
-      ++ lib.optional stdenv.hostPlatform.isDarwin fixDarwinDylibNames;
-
-    buildInputs = [ libxml2 libllvm ];
-
-    cmakeFlags = [
-      "-DCLANGD_BUILD_XPC=OFF"
-      "-DLLVM_ENABLE_RTTI=ON"
-    ] ++ lib.optionals enableManpages [
-      "-DCLANG_INCLUDE_DOCS=ON"
-      "-DLLVM_ENABLE_SPHINX=ON"
-      "-DSPHINX_OUTPUT_MAN=ON"
-      "-DSPHINX_OUTPUT_HTML=OFF"
-      "-DSPHINX_WARNINGS_AS_ERRORS=OFF"
-    ] ++ lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
-      "-DLLVM_TABLEGEN_EXE=${buildLlvmTools.llvm}/bin/llvm-tblgen"
-      "-DCLANG_TABLEGEN=${buildLlvmTools.libclang.dev}/bin/clang-tblgen"
-    ];
-
-    patches = [
-      ./purity.patch
-      # https://reviews.llvm.org/D51899
-      ./gnu-install-dirs.patch
-      # Revert of https://reviews.llvm.org/D100879
-      # The malloc alignment assumption is incorrect for jemalloc and causes
-      # mis-compilation in firefox.
-      # See: https://bugzilla.mozilla.org/show_bug.cgi?id=1741454
-      ./revert-malloc-alignment-assumption.patch
-      ../../common/clang/add-nostdlibinc-flag.patch
-      (substituteAll {
-        src = ../../common/clang/clang-11-15-LLVMgold-path.patch;
-        libllvmLibdir = "${libllvm.lib}/lib";
-      })
-    ];
-
-    postPatch = ''
-      (cd tools && ln -s ../../clang-tools-extra extra)
-    '' + lib.optionalString stdenv.hostPlatform.isMusl ''
-      sed -i -e 's/lgcc_s/lgcc_eh/' lib/Driver/ToolChains/*.cpp
-    '';
-
-    outputs = [ "out" "lib" "dev" "python" ];
-
-    postInstall = ''
-      ln -sv $out/bin/clang $out/bin/cpp
-
-      # Move libclang to 'lib' output
-      moveToOutput "lib/libclang.*" "$lib"
-      moveToOutput "lib/libclang-cpp.*" "$lib"
-      substituteInPlace $out/lib/cmake/clang/ClangTargets-release.cmake \
-          --replace "\''${_IMPORT_PREFIX}/lib/libclang." "$lib/lib/libclang." \
-          --replace "\''${_IMPORT_PREFIX}/lib/libclang-cpp." "$lib/lib/libclang-cpp."
-
-      mkdir -p $python/bin $python/share/{clang,scan-view}
-      mv $out/bin/{git-clang-format,scan-view} $python/bin
-      if [ -e $out/bin/set-xcode-analyzer ]; then
-        mv $out/bin/set-xcode-analyzer $python/bin
-      fi
-      mv $out/share/clang/*.py $python/share/clang
-      mv $out/share/scan-view/*.py $python/share/scan-view
-      rm $out/bin/c-index-test
-      patchShebangs $python/bin
-
-      mkdir -p $dev/bin
-      cp bin/clang-tblgen $dev/bin
-    '';
-
-    passthru = {
-      inherit libllvm;
-      isClang = true;
-      hardeningUnsupportedFlags = [ "fortify3" "zerocallusedregs" ];
-    };
-
-    meta = llvm_meta // {
-      homepage = "https://clang.llvm.org/";
-      description = "A C language family frontend for LLVM";
-      longDescription = ''
-        The Clang project provides a language front-end and tooling
-        infrastructure for languages in the C language family (C, C++, Objective
-        C/C++, OpenCL, CUDA, and RenderScript) for the LLVM project.
-        It aims to deliver amazingly fast compiles, extremely useful error and
-        warning messages and to provide a platform for building great source
-        level tools. The Clang Static Analyzer and clang-tidy are tools that
-        automatically find bugs in your code, and are great examples of the sort
-        of tools that can be built using the Clang frontend as a library to
-        parse C/C++ code.
-      '';
-      mainProgram = "clang";
-    };
-  } // lib.optionalAttrs enableManpages {
-    pname = "clang-manpages";
-
-    buildPhase = ''
-      make docs-clang-man
-    '';
-
-    installPhase = ''
-      mkdir -p $out/share/man/man1
-      # Manually install clang manpage
-      cp docs/man/*.1 $out/share/man/man1/
-    '';
-
-    outputs = [ "out" ];
-
-    doCheck = false;
-
-    meta = llvm_meta // {
-      description = "man page for Clang ${version}";
-    };
-  });
-in self
diff --git a/pkgs/development/compilers/llvm/13/default.nix b/pkgs/development/compilers/llvm/13/default.nix
index 712c6e160d1e..ecdbd14e98e7 100644
--- a/pkgs/development/compilers/llvm/13/default.nix
+++ b/pkgs/development/compilers/llvm/13/default.nix
@@ -1,7 +1,7 @@
 { lowPrio, newScope, pkgs, lib, stdenv, cmake
 , preLibcCrossHeaders
 , fetchpatch
-, libxml2, python3, isl, fetchFromGitHub, substitute, overrideCC, wrapCCWith, wrapBintoolsWith
+, libxml2, python3, isl, fetchFromGitHub, substitute, substituteAll, overrideCC, wrapCCWith, wrapBintoolsWith
 , buildLlvmTools # tools, but from the previous stage, for cross
 , targetLlvmLibraries # libraries, but from the next stage, for cross
 , targetLlvm
@@ -82,7 +82,7 @@ in let
     then tools.bintools
     else bootBintools;
 
-  in {
+  in rec {
 
     libllvm = callPackage ./llvm {
       inherit llvm_meta;
@@ -92,7 +92,22 @@ in let
     # we need to reintroduce `outputSpecified` to get the expected behavior e.g. of lib.get*
     llvm = tools.libllvm;
 
-    libclang = callPackage ./clang {
+    libclang = callPackage ../common/clang {
+      patches = [
+        ./clang/purity.patch
+        # https://reviews.llvm.org/D51899
+        ./clang/gnu-install-dirs.patch
+        # Revert of https://reviews.llvm.org/D100879
+        # The malloc alignment assumption is incorrect for jemalloc and causes
+        # mis-compilation in firefox.
+        # See: https://bugzilla.mozilla.org/show_bug.cgi?id=1741454
+        ./clang/revert-malloc-alignment-assumption.patch
+        ../common/clang/add-nostdlibinc-flag.patch
+        (substituteAll {
+          src = ../common/clang/clang-11-15-LLVMgold-path.patch;
+          libllvmLibdir = "${libllvm.lib}/lib";
+        })
+      ];
       inherit llvm_meta;
     };
 
diff --git a/pkgs/development/compilers/llvm/14/clang/default.nix b/pkgs/development/compilers/llvm/14/clang/default.nix
deleted file mode 100644
index 829edb15d600..000000000000
--- a/pkgs/development/compilers/llvm/14/clang/default.nix
+++ /dev/null
@@ -1,129 +0,0 @@
-{ lib, stdenv, llvm_meta
-, monorepoSrc, runCommand
-, substituteAll, cmake, libxml2, libllvm, version, python3
-, buildLlvmTools
-, fixDarwinDylibNames
-, enableManpages ? false
-}:
-
-let
-  self = stdenv.mkDerivation (rec {
-    pname = "clang";
-    inherit version;
-
-    src = runCommand "${pname}-src-${version}" {} ''
-      mkdir -p "$out"
-      cp -r ${monorepoSrc}/cmake "$out"
-      cp -r ${monorepoSrc}/${pname} "$out"
-      cp -r ${monorepoSrc}/clang-tools-extra "$out"
-    '';
-
-    sourceRoot = "${src.name}/${pname}";
-
-    nativeBuildInputs = [ cmake python3 ]
-      ++ lib.optional enableManpages python3.pkgs.sphinx
-      ++ lib.optional stdenv.hostPlatform.isDarwin fixDarwinDylibNames;
-
-    buildInputs = [ libxml2 libllvm ];
-
-    cmakeFlags = [
-      "-DCLANGD_BUILD_XPC=OFF"
-      "-DLLVM_ENABLE_RTTI=ON"
-    ] ++ lib.optionals enableManpages [
-      "-DCLANG_INCLUDE_DOCS=ON"
-      "-DLLVM_ENABLE_SPHINX=ON"
-      "-DSPHINX_OUTPUT_MAN=ON"
-      "-DSPHINX_OUTPUT_HTML=OFF"
-      "-DSPHINX_WARNINGS_AS_ERRORS=OFF"
-    ] ++ lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) [
-      "-DLLVM_TABLEGEN_EXE=${buildLlvmTools.llvm}/bin/llvm-tblgen"
-      "-DCLANG_TABLEGEN=${buildLlvmTools.libclang.dev}/bin/clang-tblgen"
-    ];
-
-    patches = [
-      ./purity.patch
-      # https://reviews.llvm.org/D51899
-      ./gnu-install-dirs.patch
-      ../../common/clang/add-nostdlibinc-flag.patch
-      (substituteAll {
-        src = ../../common/clang/clang-11-15-LLVMgold-path.patch;
-        libllvmLibdir = "${libllvm.lib}/lib";
-      })
-    ];
-
-    postPatch = ''
-      (cd tools && ln -s ../../clang-tools-extra extra)
-    '' + lib.optionalString stdenv.hostPlatform.isMusl ''
-      sed -i -e 's/lgcc_s/lgcc_eh/' lib/Driver/ToolChains/*.cpp
-    '';
-
-    outputs = [ "out" "lib" "dev" "python" ];
-
-    postInstall = ''
-      ln -sv $out/bin/clang $out/bin/cpp
-
-      # Move libclang to 'lib' output
-      moveToOutput "lib/libclang.*" "$lib"
-      moveToOutput "lib/libclang-cpp.*" "$lib"
-      substituteInPlace $out/lib/cmake/clang/ClangTargets-release.cmake \
-          --replace "\''${_IMPORT_PREFIX}/lib/libclang." "$lib/lib/libclang." \
-          --replace "\''${_IMPORT_PREFIX}/lib/libclang-cpp." "$lib/lib/libclang-cpp."
-
-      mkdir -p $python/bin $python/share/{clang,scan-view}
-      mv $out/bin/{git-clang-format,scan-view} $python/bin
-      if [ -e $out/bin/set-xcode-analyzer ]; then
-        mv $out/bin/set-xcode-analyzer $python/bin
-      fi
-      mv $out/share/clang/*.py $python/share/clang
-      mv $out/share/scan-view/*.py $python/share/scan-view
-      rm $out/bin/c-index-test
-      patchShebangs $python/bin
-
-      mkdir -p $dev/bin
-      cp bin/clang-tblgen $dev/bin
-    '';
-
-    passthru = {
-      inherit libllvm;
-      isClang = true;
-      hardeningUnsupportedFlags = [ "fortify3" "zerocallusedregs" ];
-    };
-
-    meta = llvm_meta // {
-      homepage = "https://clang.llvm.org/";
-      description = "A C language family frontend for LLVM";
-      longDescription = ''
-        The Clang project provides a language front-end and tooling
-        infrastructure for languages in the C language family (C, C++, Objective
-        C/C++, OpenCL, CUDA, and RenderScript) for the LLVM project.
-        It aims to deliver amazingly fast compiles, extremely useful error and
-        warning messages and to provide a platform for building great source
-        level tools. The Clang Static Analyzer and clang-tidy are tools that
-        automatically find bugs in your code, and are great examples of the sort
-        of tools that can be built using the Clang frontend as a library to
-        parse C/C++ code.
-      '';
-      mainProgram = "clang";
-    };
-  } // lib.optionalAttrs enableManpages {
-    pname = "clang-manpages";
-
-    buildPhase = ''
-      make docs-clang-man
-    '';
-
-    installPhase = ''
-      mkdir -p $out/share/man/man1
-      # Manually install clang manpage
-      cp docs/man/*.1 $out/share/man/man1/
-    '';
-
-    outputs = [ "out" ];
-
-    doCheck = false;
-
-    meta = llvm_meta // {
-      description = "man page for Clang ${version}";
-    };
-  });
-in self
diff --git a/pkgs/development/compilers/llvm/14/default.nix b/pkgs/development/compilers/llvm/14/default.nix
index efab4ca73572..fb1b8743b6eb 100644
--- a/pkgs/development/compilers/llvm/14/default.nix
+++ b/pkgs/development/compilers/llvm/14/default.nix
@@ -1,6 +1,6 @@
 { lowPrio, newScope, pkgs, lib, stdenv, cmake
 , preLibcCrossHeaders
-, libxml2, python3, fetchFromGitHub, substitute, overrideCC, wrapCCWith, wrapBintoolsWith
+, libxml2, python3, fetchFromGitHub, substitute, substituteAll, overrideCC, wrapCCWith, wrapBintoolsWith
 , buildLlvmTools # tools, but from the previous stage, for cross
 , targetLlvmLibraries # libraries, but from the next stage, for cross
 , targetLlvm
@@ -78,7 +78,7 @@ in let
     then tools.bintools
     else bootBintools;
 
-  in {
+  in rec {
 
     libllvm = callPackage ./llvm {
       inherit llvm_meta;
@@ -88,7 +88,17 @@ in let
     # we need to reintroduce `outputSpecified` to get the expected behavior e.g. of lib.get*
     llvm = tools.libllvm;
 
-    libclang = callPackage ./clang {
+    libclang = callPackage ../common/clang {
+      patches = [
+        ./clang/purity.patch
+        # https://reviews.llvm.org/D51899
+        ./clang/gnu-install-dirs.patch
+        ../common/clang/add-nostdlibinc-flag.patch
+        (substituteAll {
+          src = ../common/clang/clang-11-15-LLVMgold-path.patch;
+          libllvmLibdir = "${libllvm.lib}/lib";
+        })
+      ];
       inherit llvm_meta;
     };
 
diff --git a/pkgs/development/compilers/llvm/15/default.nix b/pkgs/development/compilers/llvm/15/default.nix
index 01112e0165e4..ce8426857ebe 100644
--- a/pkgs/development/compilers/llvm/15/default.nix
+++ b/pkgs/development/compilers/llvm/15/default.nix
@@ -1,6 +1,6 @@
 { lowPrio, newScope, pkgs, lib, stdenv, cmake, ninja
 , preLibcCrossHeaders
-, libxml2, python3, fetchFromGitHub, fetchpatch, substitute, overrideCC, wrapCCWith, wrapBintoolsWith
+, libxml2, python3, fetchFromGitHub, fetchpatch, substitute, substituteAll, overrideCC, wrapCCWith, wrapBintoolsWith
 , buildLlvmTools # tools, but from the previous stage, for cross
 , targetLlvmLibraries # libraries, but from the next stage, for cross
 , targetLlvm
@@ -84,7 +84,7 @@ in let
     then tools.bintools
     else bootBintools;
 
-  in {
+  in rec {
 
     libllvm = callPackage ./llvm {
       inherit llvm_meta;
@@ -94,7 +94,17 @@ in let
     # we need to reintroduce `outputSpecified` to get the expected behavior e.g. of lib.get*
     llvm = tools.libllvm;
 
-    libclang = callPackage ./clang {
+    libclang = callPackage ../common/clang {
+      patches = [
+        ./clang/purity.patch
+        # https://reviews.llvm.org/D51899
+        ./clang/gnu-install-dirs.patch
+        ../common/clang/add-nostdlibinc-flag.patch
+        (substituteAll {
+          src = ../common/clang/clang-11-15-LLVMgold-path.patch;
+          libllvmLibdir = "${libllvm.lib}/lib";
+        })
+      ];
       inherit llvm_meta;
     };
 
diff --git a/pkgs/development/compilers/llvm/16/clang/default.nix b/pkgs/development/compilers/llvm/16/clang/default.nix
deleted file mode 100644
index c5d9af356d9e..000000000000
--- a/pkgs/development/compilers/llvm/16/clang/default.nix
+++ /dev/null
@@ -1,137 +0,0 @@
-{ lib, stdenv, llvm_meta
-, monorepoSrc, runCommand
-, substituteAll, cmake, ninja, libxml2, libllvm, version, python3
-, buildLlvmTools
-, fixDarwinDylibNames
-, enableManpages ? false
-}:
-
-let
-  self = stdenv.mkDerivation (finalAttrs: rec {
-    pname = "clang";
-    inherit version;
-
-    src = runCommand "${pname}-src-${version}" {} ''
-      mkdir -p "$out"
-      cp -r ${monorepoSrc}/cmake "$out"
-      cp -r ${monorepoSrc}/${pname} "$out"
-      cp -r ${monorepoSrc}/clang-tools-extra "$out"
-    '';
-
-    sourceRoot = "${src.name}/${pname}";
-
-    nativeBuildInputs = [ cmake ninja python3 ]
-      ++ lib.optional enableManpages python3.pkgs.sphinx
-      ++ lib.optional stdenv.hostPlatform.isDarwin fixDarwinDylibNames;
-
-    buildInputs = [ libxml2 libllvm ];
-
-    cmakeFlags = [
-      "-DCLANG_INSTALL_PACKAGE_DIR=${placeholder "dev"}/lib/cmake/clang"
-      "-DCLANGD_BUILD_XPC=OFF"
-      "-DLLVM_ENABLE_RTTI=ON"
-    ] ++ lib.optionals enableManpages [
-      "-DCLANG_INCLUDE_DOCS=ON"
-      "-DLLVM_ENABLE_SPHINX=ON"
-      "-DSPHINX_OUTPUT_MAN=ON"
-      "-DSPHINX_OUTPUT_HTML=OFF"
-      "-DSPHINX_WARNINGS_AS_ERRORS=OFF"
-    ] ++ lib.optionals (!stdenv.buildPlatform.canExecute stdenv.hostPlatform) [
-      "-DLLVM_TABLEGEN_EXE=${buildLlvmTools.llvm}/bin/llvm-tblgen"
-      "-DCLANG_TABLEGEN=${buildLlvmTools.libclang.dev}/bin/clang-tblgen"
-      # Added in LLVM15:
-      # `clang-tidy-confusable-chars-gen`: https://github.com/llvm/llvm-project/commit/c3574ef739fbfcc59d405985a3a4fa6f4619ecdb
-      # `clang-pseudo-gen`: https://github.com/llvm/llvm-project/commit/cd2292ef824591cc34cc299910a3098545c840c7
-      "-DCLANG_TIDY_CONFUSABLE_CHARS_GEN=${buildLlvmTools.libclang.dev}/bin/clang-tidy-confusable-chars-gen"
-      "-DCLANG_PSEUDO_GEN=${buildLlvmTools.libclang.dev}/bin/clang-pseudo-gen"
-    ];
-
-    patches = [
-      ./purity.patch
-      # https://reviews.llvm.org/D51899
-      ./gnu-install-dirs.patch
-      ../../common/clang/add-nostdlibinc-flag.patch
-      (substituteAll {
-        src = ../../common/clang/clang-at-least-16-LLVMgold-path.patch;
-       libllvmLibdir = "${libllvm.lib}/lib";
-      })
-    ];
-
-    postPatch = ''
-      (cd tools && ln -s ../../clang-tools-extra extra)
-    '' + lib.optionalString stdenv.hostPlatform.isMusl ''
-      sed -i -e 's/lgcc_s/lgcc_eh/' lib/Driver/ToolChains/*.cpp
-    '';
-
-    outputs = [ "out" "lib" "dev" "python" ];
-
-    postInstall = ''
-      ln -sv $out/bin/clang $out/bin/cpp
-
-      # Move libclang to 'lib' output
-      moveToOutput "lib/libclang.*" "$lib"
-      moveToOutput "lib/libclang-cpp.*" "$lib"
-      substituteInPlace $dev/lib/cmake/clang/ClangTargets-release.cmake \
-          --replace "\''${_IMPORT_PREFIX}/lib/libclang." "$lib/lib/libclang." \
-          --replace "\''${_IMPORT_PREFIX}/lib/libclang-cpp." "$lib/lib/libclang-cpp."
-
-      mkdir -p $python/bin $python/share/clang/
-      mv $out/bin/{git-clang-format,scan-view} $python/bin
-      if [ -e $out/bin/set-xcode-analyzer ]; then
-        mv $out/bin/set-xcode-analyzer $python/bin
-      fi
-      mv $out/share/clang/*.py $python/share/clang
-      rm $out/bin/c-index-test
-      patchShebangs $python/bin
-
-      mkdir -p $dev/bin
-      cp bin/{clang-tblgen,clang-tidy-confusable-chars-gen,clang-pseudo-gen} $dev/bin
-    '';
-
-    passthru = {
-      inherit libllvm;
-      isClang = true;
-      hardeningUnsupportedFlags = [
-        "fortify3"
-      ];
-      hardeningUnsupportedFlagsByTargetPlatform = targetPlatform:
-        lib.optional (!(targetPlatform.isx86_64 || targetPlatform.isAarch64)) "zerocallusedregs"
-        ++ (finalAttrs.passthru.hardeningUnsupportedFlags or []);
-    };
-
-    meta = llvm_meta // {
-      homepage = "https://clang.llvm.org/";
-      description = "A C language family frontend for LLVM";
-      longDescription = ''
-        The Clang project provides a language front-end and tooling
-        infrastructure for languages in the C language family (C, C++, Objective
-        C/C++, OpenCL, CUDA, and RenderScript) for the LLVM project.
-        It aims to deliver amazingly fast compiles, extremely useful error and
-        warning messages and to provide a platform for building great source
-        level tools. The Clang Static Analyzer and clang-tidy are tools that
-        automatically find bugs in your code, and are great examples of the sort
-        of tools that can be built using the Clang frontend as a library to
-        parse C/C++ code.
-      '';
-      mainProgram = "clang";
-    };
-  } // lib.optionalAttrs enableManpages {
-    pname = "clang-manpages";
-
-    ninjaFlags = [ "docs-clang-man" ];
-
-    installPhase = ''
-      mkdir -p $out/share/man/man1
-      # Manually install clang manpage
-      cp docs/man/*.1 $out/share/man/man1/
-    '';
-
-    outputs = [ "out" ];
-
-    doCheck = false;
-
-    meta = llvm_meta // {
-      description = "man page for Clang ${version}";
-    };
-  });
-in self
diff --git a/pkgs/development/compilers/llvm/16/default.nix b/pkgs/development/compilers/llvm/16/default.nix
index 99ab725273b8..5716267426b2 100644
--- a/pkgs/development/compilers/llvm/16/default.nix
+++ b/pkgs/development/compilers/llvm/16/default.nix
@@ -1,6 +1,6 @@
 { lowPrio, newScope, pkgs, lib, stdenv, cmake, ninja
 , preLibcCrossHeaders
-, libxml2, python3, fetchFromGitHub, overrideCC, wrapCCWith, wrapBintoolsWith
+, libxml2, python3, fetchFromGitHub, substituteAll, overrideCC, wrapCCWith, wrapBintoolsWith
 , buildLlvmTools # tools, but from the previous stage, for cross
 , targetLlvmLibraries # libraries, but from the next stage, for cross
 , targetLlvm
@@ -85,7 +85,7 @@ in let
     then tools.bintools
     else bootBintools;
 
-  in {
+  in rec {
 
     libllvm = callPackage ./llvm {
       inherit llvm_meta;
@@ -95,7 +95,17 @@ in let
     # we need to reintroduce `outputSpecified` to get the expected behavior e.g. of lib.get*
     llvm = tools.libllvm;
 
-    libclang = callPackage ./clang {
+    libclang = callPackage ../common/clang {
+      patches = [
+        ./clang/purity.patch
+        # https://reviews.llvm.org/D51899
+        ./clang/gnu-install-dirs.patch
+        ../common/clang/add-nostdlibinc-flag.patch
+        (substituteAll {
+          src = ../common/clang/clang-at-least-16-LLVMgold-path.patch;
+         libllvmLibdir = "${libllvm.lib}/lib";
+        })
+      ];
       inherit llvm_meta;
     };
 
diff --git a/pkgs/development/compilers/llvm/17/clang/default.nix b/pkgs/development/compilers/llvm/17/clang/default.nix
deleted file mode 100644
index f7922f3d9951..000000000000
--- a/pkgs/development/compilers/llvm/17/clang/default.nix
+++ /dev/null
@@ -1,141 +0,0 @@
-{ lib, stdenv, llvm_meta
-, monorepoSrc, runCommand
-, substituteAll, cmake, ninja, libxml2, libllvm, version, python3
-, buildLlvmTools
-, fixDarwinDylibNames
-, enableManpages ? false
-}:
-
-let
-  self = stdenv.mkDerivation (finalAttrs: rec {
-    pname = "clang";
-    inherit version;
-
-    src = runCommand "${pname}-src-${version}" {} ''
-      mkdir -p "$out"
-      cp -r ${monorepoSrc}/cmake "$out"
-      cp -r ${monorepoSrc}/${pname} "$out"
-      cp -r ${monorepoSrc}/clang-tools-extra "$out"
-    '';
-
-    sourceRoot = "${src.name}/${pname}";
-
-    nativeBuildInputs = [ cmake ninja python3 ]
-      ++ lib.optional enableManpages python3.pkgs.sphinx
-      ++ lib.optional stdenv.hostPlatform.isDarwin fixDarwinDylibNames;
-
-    buildInputs = [ libxml2 libllvm ];
-
-    cmakeFlags = [
-      "-DCLANG_INSTALL_PACKAGE_DIR=${placeholder "dev"}/lib/cmake/clang"
-      "-DCLANGD_BUILD_XPC=OFF"
-      "-DLLVM_ENABLE_RTTI=ON"
-      "-DLLVM_INCLUDE_TESTS=OFF"
-    ] ++ lib.optionals enableManpages [
-      "-DCLANG_INCLUDE_DOCS=ON"
-      "-DLLVM_ENABLE_SPHINX=ON"
-      "-DSPHINX_OUTPUT_MAN=ON"
-      "-DSPHINX_OUTPUT_HTML=OFF"
-      "-DSPHINX_WARNINGS_AS_ERRORS=OFF"
-    ] ++ lib.optionals (!stdenv.buildPlatform.canExecute stdenv.hostPlatform) [
-      "-DLLVM_TABLEGEN_EXE=${buildLlvmTools.llvm}/bin/llvm-tblgen"
-      "-DCLANG_TABLEGEN=${buildLlvmTools.libclang.dev}/bin/clang-tblgen"
-      # Added in LLVM15:
-      # `clang-tidy-confusable-chars-gen`: https://github.com/llvm/llvm-project/commit/c3574ef739fbfcc59d405985a3a4fa6f4619ecdb
-      # `clang-pseudo-gen`: https://github.com/llvm/llvm-project/commit/cd2292ef824591cc34cc299910a3098545c840c7
-      "-DCLANG_TIDY_CONFUSABLE_CHARS_GEN=${buildLlvmTools.libclang.dev}/bin/clang-tidy-confusable-chars-gen"
-      "-DCLANG_PSEUDO_GEN=${buildLlvmTools.libclang.dev}/bin/clang-pseudo-gen"
-    ];
-
-    patches = [
-      ./purity.patch
-      # https://reviews.llvm.org/D51899
-      ./gnu-install-dirs.patch
-      ../../common/clang/add-nostdlibinc-flag.patch
-      (substituteAll {
-        src = ../../common/clang/clang-at-least-16-LLVMgold-path.patch;
-       libllvmLibdir = "${libllvm.lib}/lib";
-      })
-    ];
-
-    postPatch = ''
-      (cd tools && ln -s ../../clang-tools-extra extra)
-    '' + lib.optionalString stdenv.hostPlatform.isMusl ''
-      sed -i -e 's/lgcc_s/lgcc_eh/' lib/Driver/ToolChains/*.cpp
-    '';
-
-    outputs = [ "out" "lib" "dev" "python" ];
-
-    postInstall = ''
-      ln -sv $out/bin/clang $out/bin/cpp
-
-      mkdir -p $lib/lib/clang
-      mv $lib/lib/17 $lib/lib/clang/17
-
-      # Move libclang to 'lib' output
-      moveToOutput "lib/libclang.*" "$lib"
-      moveToOutput "lib/libclang-cpp.*" "$lib"
-      substituteInPlace $dev/lib/cmake/clang/ClangTargets-release.cmake \
-          --replace "\''${_IMPORT_PREFIX}/lib/libclang." "$lib/lib/libclang." \
-          --replace "\''${_IMPORT_PREFIX}/lib/libclang-cpp." "$lib/lib/libclang-cpp."
-
-      mkdir -p $python/bin $python/share/clang/
-      mv $out/bin/{git-clang-format,scan-view} $python/bin
-      if [ -e $out/bin/set-xcode-analyzer ]; then
-        mv $out/bin/set-xcode-analyzer $python/bin
-      fi
-      mv $out/share/clang/*.py $python/share/clang
-      rm $out/bin/c-index-test
-      patchShebangs $python/bin
-
-      mkdir -p $dev/bin
-      cp bin/{clang-tblgen,clang-tidy-confusable-chars-gen,clang-pseudo-gen} $dev/bin
-    '';
-
-    passthru = {
-      inherit libllvm;
-      isClang = true;
-      hardeningUnsupportedFlags = [
-        "fortify3"
-      ];
-      hardeningUnsupportedFlagsByTargetPlatform = targetPlatform:
-        lib.optional (!(targetPlatform.isx86_64 || targetPlatform.isAarch64)) "zerocallusedregs"
-        ++ (finalAttrs.passthru.hardeningUnsupportedFlags or []);
-    };
-
-    meta = llvm_meta // {
-      homepage = "https://clang.llvm.org/";
-      description = "A C language family frontend for LLVM";
-      longDescription = ''
-        The Clang project provides a language front-end and tooling
-        infrastructure for languages in the C language family (C, C++, Objective
-        C/C++, OpenCL, CUDA, and RenderScript) for the LLVM project.
-        It aims to deliver amazingly fast compiles, extremely useful error and
-        warning messages and to provide a platform for building great source
-        level tools. The Clang Static Analyzer and clang-tidy are tools that
-        automatically find bugs in your code, and are great examples of the sort
-        of tools that can be built using the Clang frontend as a library to
-        parse C/C++ code.
-      '';
-      mainProgram = "clang";
-    };
-  } // lib.optionalAttrs enableManpages {
-    pname = "clang-manpages";
-
-    ninjaFlags = [ "docs-clang-man" ];
-
-    installPhase = ''
-      mkdir -p $out/share/man/man1
-      # Manually install clang manpage
-      cp docs/man/*.1 $out/share/man/man1/
-    '';
-
-    outputs = [ "out" ];
-
-    doCheck = false;
-
-    meta = llvm_meta // {
-      description = "man page for Clang ${version}";
-    };
-  });
-in self
diff --git a/pkgs/development/compilers/llvm/17/default.nix b/pkgs/development/compilers/llvm/17/default.nix
index 2f2663217653..2f60666536f3 100644
--- a/pkgs/development/compilers/llvm/17/default.nix
+++ b/pkgs/development/compilers/llvm/17/default.nix
@@ -1,6 +1,6 @@
 { lowPrio, newScope, pkgs, lib, stdenv, cmake, ninja
 , preLibcCrossHeaders
-, libxml2, python3, fetchFromGitHub, fetchpatch, overrideCC, wrapCCWith, wrapBintoolsWith
+, libxml2, python3, fetchFromGitHub, fetchpatch, substituteAll, overrideCC, wrapCCWith, wrapBintoolsWith
 , buildLlvmTools # tools, but from the previous stage, for cross
 , targetLlvmLibraries # libraries, but from the next stage, for cross
 , targetLlvm
@@ -80,7 +80,7 @@ in let
     then tools.bintools
     else bootBintools;
 
-  in {
+  in rec {
 
     libllvm = callPackage ./llvm {
       inherit llvm_meta;
@@ -90,7 +90,17 @@ in let
     # we need to reintroduce `outputSpecified` to get the expected behavior e.g. of lib.get*
     llvm = tools.libllvm;
 
-    libclang = callPackage ./clang {
+    libclang = callPackage ../common/clang {
+      patches = [
+        ./clang/purity.patch
+        # https://reviews.llvm.org/D51899
+        ./clang/gnu-install-dirs.patch
+        ../common/clang/add-nostdlibinc-flag.patch
+        (substituteAll {
+          src = ../common/clang/clang-at-least-16-LLVMgold-path.patch;
+          libllvmLibdir = "${libllvm.lib}/lib";
+        })
+      ];
       inherit llvm_meta;
     };
 
diff --git a/pkgs/development/compilers/llvm/18/default.nix b/pkgs/development/compilers/llvm/18/default.nix
index 4bc56be45b3e..0a30288755e6 100644
--- a/pkgs/development/compilers/llvm/18/default.nix
+++ b/pkgs/development/compilers/llvm/18/default.nix
@@ -1,6 +1,6 @@
 { lowPrio, newScope, pkgs, lib, stdenv, cmake, ninja
 , preLibcCrossHeaders
-, libxml2, python3, fetchFromGitHub, overrideCC, wrapCCWith, wrapBintoolsWith
+, libxml2, python3, fetchFromGitHub, substituteAll, overrideCC, wrapCCWith, wrapBintoolsWith
 , buildLlvmTools # tools, but from the previous stage, for cross
 , targetLlvmLibraries # libraries, but from the next stage, for cross
 , targetLlvm
@@ -80,7 +80,7 @@ in let
     then tools.bintools
     else bootBintools;
 
-  in {
+  in rec {
 
     libllvm = callPackage ./llvm {
       inherit llvm_meta;
@@ -90,7 +90,17 @@ in let
     # we need to reintroduce `outputSpecified` to get the expected behavior e.g. of lib.get*
     llvm = tools.libllvm;
 
-    libclang = callPackage ./clang {
+    libclang = callPackage ../common/clang {
+      patches = [
+        ./clang/purity.patch
+        # https://reviews.llvm.org/D51899
+        ./clang/gnu-install-dirs.patch
+        ../common/clang/add-nostdlibinc-flag.patch
+        (substituteAll {
+          src = ../common/clang/clang-at-least-16-LLVMgold-path.patch;
+          libllvmLibdir = "${libllvm.lib}/lib";
+        })
+      ];
       inherit llvm_meta;
     };
 
diff --git a/pkgs/development/compilers/llvm/15/clang/default.nix b/pkgs/development/compilers/llvm/common/clang/default.nix
index de789edaa9ff..2373795b49fd 100644
--- a/pkgs/development/compilers/llvm/15/clang/default.nix
+++ b/pkgs/development/compilers/llvm/common/clang/default.nix
@@ -1,109 +1,145 @@
-{ lib, stdenv, llvm_meta
-, monorepoSrc, runCommand
-, substituteAll, cmake, ninja, libxml2, libllvm, version, python3
+{ lib
+, stdenv
+, llvm_meta
+, patches ? []
+, src ? null
+, monorepoSrc ? null
+, runCommand
+, substituteAll
+, cmake
+, ninja
+, libxml2
+, libllvm
+, release_version
+, version
+, python3
 , buildLlvmTools
 , fixDarwinDylibNames
 , enableManpages ? false
+, clang-tools-extra_src ? null
 }:
 
 let
-  self = stdenv.mkDerivation (finalAttrs: rec {
-    pname = "clang";
-    inherit version;
+  pname = "clang";
 
-    src = runCommand "${pname}-src-${version}" {} ''
+  src' = if monorepoSrc != null then
+    runCommand "${pname}-src-${version}" {} ''
       mkdir -p "$out"
       cp -r ${monorepoSrc}/cmake "$out"
       cp -r ${monorepoSrc}/${pname} "$out"
       cp -r ${monorepoSrc}/clang-tools-extra "$out"
-    '';
+    '' else src;
+
+  self = stdenv.mkDerivation (finalAttrs: rec {
+    inherit pname version patches;
 
-    sourceRoot = "${src.name}/${pname}";
+    src = src';
 
-    nativeBuildInputs = [ cmake ninja python3 ]
+    sourceRoot = if lib.versionOlder release_version "13" then null
+      else "${src.name}/${pname}";
+
+    nativeBuildInputs = [ cmake ]
+      ++ (lib.optional (lib.versionAtLeast release_version "15") ninja)
+      ++ [ python3 ]
+      ++ lib.optional (lib.versionAtLeast version "18" && enableManpages) python3.pkgs.myst-parser
       ++ lib.optional enableManpages python3.pkgs.sphinx
       ++ lib.optional stdenv.hostPlatform.isDarwin fixDarwinDylibNames;
 
     buildInputs = [ libxml2 libllvm ];
 
-    cmakeFlags = [
+    cmakeFlags = (lib.optionals (lib.versionAtLeast release_version "15") [
       "-DCLANG_INSTALL_PACKAGE_DIR=${placeholder "dev"}/lib/cmake/clang"
+    ]) ++ [
       "-DCLANGD_BUILD_XPC=OFF"
       "-DLLVM_ENABLE_RTTI=ON"
+    ] ++ lib.optionals (lib.versionAtLeast release_version "17") [
+      "-DLLVM_INCLUDE_TESTS=OFF"
     ] ++ lib.optionals enableManpages [
       "-DCLANG_INCLUDE_DOCS=ON"
       "-DLLVM_ENABLE_SPHINX=ON"
       "-DSPHINX_OUTPUT_MAN=ON"
       "-DSPHINX_OUTPUT_HTML=OFF"
       "-DSPHINX_WARNINGS_AS_ERRORS=OFF"
-    ] ++ lib.optionals (!stdenv.buildPlatform.canExecute stdenv.hostPlatform) [
+    ] ++ lib.optionals (stdenv.hostPlatform != stdenv.buildPlatform) ([
       "-DLLVM_TABLEGEN_EXE=${buildLlvmTools.llvm}/bin/llvm-tblgen"
       "-DCLANG_TABLEGEN=${buildLlvmTools.libclang.dev}/bin/clang-tblgen"
+    ] ++ lib.optionals (lib.versionAtLeast release_version "15") [
       # Added in LLVM15:
       # `clang-tidy-confusable-chars-gen`: https://github.com/llvm/llvm-project/commit/c3574ef739fbfcc59d405985a3a4fa6f4619ecdb
       # `clang-pseudo-gen`: https://github.com/llvm/llvm-project/commit/cd2292ef824591cc34cc299910a3098545c840c7
       "-DCLANG_TIDY_CONFUSABLE_CHARS_GEN=${buildLlvmTools.libclang.dev}/bin/clang-tidy-confusable-chars-gen"
       "-DCLANG_PSEUDO_GEN=${buildLlvmTools.libclang.dev}/bin/clang-pseudo-gen"
-    ];
-
-    patches = [
-      ./purity.patch
-      # https://reviews.llvm.org/D51899
-      ./gnu-install-dirs.patch
-      ../../common/clang/add-nostdlibinc-flag.patch
-      (substituteAll {
-        src = ../../common/clang/clang-11-15-LLVMgold-path.patch;
-        libllvmLibdir = "${libllvm.lib}/lib";
-      })
-    ];
-
-    postPatch = ''
+    ]);
+
+    postPatch = (if lib.versionOlder release_version "13" then ''
+      sed -i -e 's/DriverArgs.hasArg(options::OPT_nostdlibinc)/true/' \
+             -e 's/Args.hasArg(options::OPT_nostdlibinc)/true/' \
+             lib/Driver/ToolChains/*.cpp
+    '' else ''
       (cd tools && ln -s ../../clang-tools-extra extra)
-    '' + lib.optionalString stdenv.hostPlatform.isMusl ''
+    '') + lib.optionalString stdenv.hostPlatform.isMusl ''
       sed -i -e 's/lgcc_s/lgcc_eh/' lib/Driver/ToolChains/*.cpp
     '';
 
     outputs = [ "out" "lib" "dev" "python" ];
 
-    env = lib.optionalAttrs (stdenv.buildPlatform != stdenv.hostPlatform) {
-      # The following warning is triggered with (at least) gcc >=
-      # 12, but appears to occur only for cross compiles.
-      NIX_CFLAGS_COMPILE = "-Wno-maybe-uninitialized";
-    };
-
     postInstall = ''
       ln -sv $out/bin/clang $out/bin/cpp
+    '' + (lib.optionalString (lib.versions.major release_version == "17") ''
+
+      mkdir -p $lib/lib/clang
+      mv $lib/lib/17 $lib/lib/clang/17
+    '') + ''
 
       # Move libclang to 'lib' output
       moveToOutput "lib/libclang.*" "$lib"
       moveToOutput "lib/libclang-cpp.*" "$lib"
+    '' + (if lib.versionOlder release_version "15" then ''
+      substituteInPlace $out/lib/cmake/clang/ClangTargets-release.cmake \
+          --replace "\''${_IMPORT_PREFIX}/lib/libclang." "$lib/lib/libclang." \
+          --replace "\''${_IMPORT_PREFIX}/lib/libclang-cpp." "$lib/lib/libclang-cpp."
+    '' else ''
       substituteInPlace $dev/lib/cmake/clang/ClangTargets-release.cmake \
           --replace "\''${_IMPORT_PREFIX}/lib/libclang." "$lib/lib/libclang." \
           --replace "\''${_IMPORT_PREFIX}/lib/libclang-cpp." "$lib/lib/libclang-cpp."
+    '') + ''
 
+    '' + (if lib.versionOlder release_version "15" then ''
+      mkdir -p $python/bin $python/share/{clang,scan-view}
+    '' else ''
       mkdir -p $python/bin $python/share/clang/
+    '') + ''
       mv $out/bin/{git-clang-format,scan-view} $python/bin
       if [ -e $out/bin/set-xcode-analyzer ]; then
         mv $out/bin/set-xcode-analyzer $python/bin
       fi
       mv $out/share/clang/*.py $python/share/clang
+    '' + (lib.optionalString (lib.versionOlder release_version "15") ''
+      mv $out/share/scan-view/*.py $python/share/scan-view
+    '') + ''
       rm $out/bin/c-index-test
       patchShebangs $python/bin
 
       mkdir -p $dev/bin
+    '' + (if lib.versionOlder release_version "15" then ''
+      cp bin/clang-tblgen $dev/bin
+    '' else ''
       cp bin/{clang-tblgen,clang-tidy-confusable-chars-gen,clang-pseudo-gen} $dev/bin
-    '';
+    '');
 
     passthru = {
       inherit libllvm;
       isClang = true;
+    } // (lib.optionalAttrs (lib.versionAtLeast release_version "15") {
       hardeningUnsupportedFlags = [
         "fortify3"
       ];
       hardeningUnsupportedFlagsByTargetPlatform = targetPlatform:
         lib.optional (!(targetPlatform.isx86_64 || targetPlatform.isAarch64)) "zerocallusedregs"
         ++ (finalAttrs.passthru.hardeningUnsupportedFlags or []);
-    };
+    }) // (lib.optionalAttrs (lib.versionOlder release_version "15") {
+      hardeningUnsupportedFlags = [ "fortify3" "zerocallusedregs" ];
+    });
 
     meta = llvm_meta // {
       homepage = "https://clang.llvm.org/";
@@ -121,11 +157,9 @@ let
       '';
       mainProgram = "clang";
     };
-  } // lib.optionalAttrs enableManpages {
+  } // lib.optionalAttrs enableManpages ({
     pname = "clang-manpages";
 
-    ninjaFlags = [ "docs-clang-man" ];
-
     installPhase = ''
       mkdir -p $out/share/man/man1
       # Manually install clang manpage
@@ -139,5 +173,29 @@ let
     meta = llvm_meta // {
       description = "man page for Clang ${version}";
     };
-  });
+  } // (if lib.versionOlder release_version "15" then {
+    buildPhase = ''
+      make docs-clang-man
+    '';
+  } else {
+    ninjaFlags = [ "docs-clang-man" ];
+  })) // (lib.optionalAttrs (clang-tools-extra_src != null) { inherit clang-tools-extra_src; })
+    // (lib.optionalAttrs (lib.versionOlder release_version "13") {
+      unpackPhase = ''
+        unpackFile $src
+        mv clang-* clang
+        sourceRoot=$PWD/clang
+        unpackFile ${clang-tools-extra_src}
+        mv clang-tools-extra-* $sourceRoot/tools/extra
+        substituteInPlace $sourceRoot/tools/extra/clangd/quality/CompletionModel.cmake \
+          --replace ' ''${CMAKE_SOURCE_DIR}/../clang-tools-extra' ' ''${CMAKE_SOURCE_DIR}/tools/extra'
+      '';
+    })
+  // (lib.optionalAttrs (lib.versionAtLeast release_version "15") {
+    env = lib.optionalAttrs (stdenv.buildPlatform != stdenv.hostPlatform) {
+      # The following warning is triggered with (at least) gcc >=
+      # 12, but appears to occur only for cross compiles.
+      NIX_CFLAGS_COMPILE = "-Wno-maybe-uninitialized";
+    };
+  }));
 in self
diff --git a/pkgs/development/compilers/llvm/git/clang/default.nix b/pkgs/development/compilers/llvm/git/clang/default.nix
deleted file mode 100644
index 1e777c6132e4..000000000000
--- a/pkgs/development/compilers/llvm/git/clang/default.nix
+++ /dev/null
@@ -1,139 +0,0 @@
-{ lib, stdenv, llvm_meta
-, monorepoSrc, runCommand
-, substituteAll, cmake, ninja, libxml2, libllvm, version, python3
-, buildLlvmTools
-, fixDarwinDylibNames
-, enableManpages ? false
-}:
-
-let
-  self = stdenv.mkDerivation (finalAttrs: rec {
-    pname = "clang";
-    inherit version;
-
-    src = runCommand "${pname}-src-${version}" {} ''
-      mkdir -p "$out"
-      cp -r ${monorepoSrc}/cmake "$out"
-      cp -r ${monorepoSrc}/${pname} "$out"
-      cp -r ${monorepoSrc}/clang-tools-extra "$out"
-    '';
-
-    sourceRoot = "${src.name}/${pname}";
-
-    nativeBuildInputs = [ cmake ninja python3 ]
-      ++ lib.optional (lib.versionAtLeast version "18" && enableManpages) python3.pkgs.myst-parser
-      ++ lib.optional enableManpages python3.pkgs.sphinx
-      ++ lib.optional stdenv.hostPlatform.isDarwin fixDarwinDylibNames;
-
-    buildInputs = [ libxml2 libllvm ];
-
-    cmakeFlags = [
-      "-DCLANG_INSTALL_PACKAGE_DIR=${placeholder "dev"}/lib/cmake/clang"
-      "-DCLANGD_BUILD_XPC=OFF"
-      "-DLLVM_ENABLE_RTTI=ON"
-      "-DLLVM_INCLUDE_TESTS=OFF"
-    ] ++ lib.optionals enableManpages [
-      "-DCLANG_INCLUDE_DOCS=ON"
-      "-DLLVM_ENABLE_SPHINX=ON"
-      "-DSPHINX_OUTPUT_MAN=ON"
-      "-DSPHINX_OUTPUT_HTML=OFF"
-      "-DSPHINX_WARNINGS_AS_ERRORS=OFF"
-    ] ++ lib.optionals (!stdenv.buildPlatform.canExecute stdenv.hostPlatform) [
-      "-DLLVM_TABLEGEN_EXE=${buildLlvmTools.llvm}/bin/llvm-tblgen"
-      "-DCLANG_TABLEGEN=${buildLlvmTools.libclang.dev}/bin/clang-tblgen"
-      # Added in LLVM15:
-      # `clang-tidy-confusable-chars-gen`: https://github.com/llvm/llvm-project/commit/c3574ef739fbfcc59d405985a3a4fa6f4619ecdb
-      # `clang-pseudo-gen`: https://github.com/llvm/llvm-project/commit/cd2292ef824591cc34cc299910a3098545c840c7
-      "-DCLANG_TIDY_CONFUSABLE_CHARS_GEN=${buildLlvmTools.libclang.dev}/bin/clang-tidy-confusable-chars-gen"
-      "-DCLANG_PSEUDO_GEN=${buildLlvmTools.libclang.dev}/bin/clang-pseudo-gen"
-    ];
-
-    patches = [
-      ./purity.patch
-      # https://reviews.llvm.org/D51899
-      ./gnu-install-dirs.patch
-      ../../common/clang/add-nostdlibinc-flag.patch
-      (substituteAll {
-        src = ../../common/clang/clang-at-least-16-LLVMgold-path.patch;
-       libllvmLibdir = "${libllvm.lib}/lib";
-      })
-    ];
-
-    postPatch = ''
-      (cd tools && ln -s ../../clang-tools-extra extra)
-    '' + lib.optionalString stdenv.hostPlatform.isMusl ''
-      sed -i -e 's/lgcc_s/lgcc_eh/' lib/Driver/ToolChains/*.cpp
-    '';
-
-    outputs = [ "out" "lib" "dev" "python" ];
-
-    postInstall = ''
-      ln -sv $out/bin/clang $out/bin/cpp
-
-      # Move libclang to 'lib' output
-      moveToOutput "lib/libclang.*" "$lib"
-      moveToOutput "lib/libclang-cpp.*" "$lib"
-      substituteInPlace $dev/lib/cmake/clang/ClangTargets-release.cmake \
-          --replace "\''${_IMPORT_PREFIX}/lib/libclang." "$lib/lib/libclang." \
-          --replace "\''${_IMPORT_PREFIX}/lib/libclang-cpp." "$lib/lib/libclang-cpp."
-
-      mkdir -p $python/bin $python/share/clang/
-      mv $out/bin/{git-clang-format,scan-view} $python/bin
-      if [ -e $out/bin/set-xcode-analyzer ]; then
-        mv $out/bin/set-xcode-analyzer $python/bin
-      fi
-      mv $out/share/clang/*.py $python/share/clang
-      rm $out/bin/c-index-test
-      patchShebangs $python/bin
-
-      mkdir -p $dev/bin
-      cp bin/{clang-tblgen,clang-tidy-confusable-chars-gen,clang-pseudo-gen} $dev/bin
-    '';
-
-    passthru = {
-      inherit libllvm;
-      isClang = true;
-      hardeningUnsupportedFlags = [
-        "fortify3"
-      ];
-      hardeningUnsupportedFlagsByTargetPlatform = targetPlatform:
-        lib.optional (!(targetPlatform.isx86_64 || targetPlatform.isAarch64)) "zerocallusedregs"
-        ++ (finalAttrs.passthru.hardeningUnsupportedFlags or []);
-    };
-
-    meta = llvm_meta // {
-      homepage = "https://clang.llvm.org/";
-      description = "A C language family frontend for LLVM";
-      longDescription = ''
-        The Clang project provides a language front-end and tooling
-        infrastructure for languages in the C language family (C, C++, Objective
-        C/C++, OpenCL, CUDA, and RenderScript) for the LLVM project.
-        It aims to deliver amazingly fast compiles, extremely useful error and
-        warning messages and to provide a platform for building great source
-        level tools. The Clang Static Analyzer and clang-tidy are tools that
-        automatically find bugs in your code, and are great examples of the sort
-        of tools that can be built using the Clang frontend as a library to
-        parse C/C++ code.
-      '';
-      mainProgram = "clang";
-    };
-  } // lib.optionalAttrs enableManpages {
-    pname = "clang-manpages";
-
-    ninjaFlags = [ "docs-clang-man" ];
-
-    installPhase = ''
-      mkdir -p $out/share/man/man1
-      # Manually install clang manpage
-      cp docs/man/*.1 $out/share/man/man1/
-    '';
-
-    outputs = [ "out" ];
-
-    doCheck = false;
-
-    meta = llvm_meta // {
-      description = "man page for Clang ${version}";
-    };
-  });
-in self
diff --git a/pkgs/development/compilers/llvm/git/default.nix b/pkgs/development/compilers/llvm/git/default.nix
index 1b65ce81055b..56fae64d59d8 100644
--- a/pkgs/development/compilers/llvm/git/default.nix
+++ b/pkgs/development/compilers/llvm/git/default.nix
@@ -1,6 +1,6 @@
 { lowPrio, newScope, pkgs, lib, stdenv, cmake, ninja
 , preLibcCrossHeaders
-, libxml2, python3, fetchFromGitHub, overrideCC, wrapCCWith, wrapBintoolsWith
+, libxml2, python3, fetchFromGitHub, substituteAll, overrideCC, wrapCCWith, wrapBintoolsWith
 , buildLlvmTools # tools, but from the previous stage, for cross
 , targetLlvmLibraries # libraries, but from the next stage, for cross
 , targetLlvm
@@ -85,7 +85,7 @@ in let
     then tools.bintools
     else bootBintools;
 
-  in {
+  in rec {
 
     libllvm = callPackage ./llvm {
       inherit llvm_meta;
@@ -95,7 +95,17 @@ in let
     # we need to reintroduce `outputSpecified` to get the expected behavior e.g. of lib.get*
     llvm = tools.libllvm;
 
-    libclang = callPackage ./clang {
+    libclang = callPackage ../common/clang {
+      patches = [
+        ./clang/purity.patch
+        # https://reviews.llvm.org/D51899
+        ./clang/gnu-install-dirs.patch
+        ../common/clang/add-nostdlibinc-flag.patch
+        (substituteAll {
+          src = ../common/clang/clang-at-least-16-LLVMgold-path.patch;
+          libllvmLibdir = "${libllvm.lib}/lib";
+        })
+      ];
       inherit llvm_meta;
     };