diff --git a/pkgs/development/compilers/llvm/14/clang/default.nix b/pkgs/development/compilers/llvm/14/clang/default.nix
index 9544494b356e5..5ff02d68de426 100644
--- a/pkgs/development/compilers/llvm/14/clang/default.nix
+++ b/pkgs/development/compilers/llvm/14/clang/default.nix
@@ -15,6 +15,7 @@ let
       mkdir -p "$out"
       cp -r ${monorepoSrc}/cmake "$out"
       cp -r ${monorepoSrc}/${pname} "$out"
+      cp -r ${monorepoSrc}/clang-tools-extra "$out"
     '';
 
     sourceRoot = "${src.name}/${pname}";
diff --git a/pkgs/development/compilers/llvm/14/default.nix b/pkgs/development/compilers/llvm/14/default.nix
index 6f4a0d8ee7547..4e5e85684a2aa 100644
--- a/pkgs/development/compilers/llvm/14/default.nix
+++ b/pkgs/development/compilers/llvm/14/default.nix
@@ -18,8 +18,8 @@
 }:
 
 let
-  release_version = "14.0.0";
-  candidate = "rc1"; # empty or "rcN"
+  release_version = "14.0.1";
+  candidate = ""; # empty or "rcN"
   dash-candidate = lib.optionalString (candidate != "") "-${candidate}";
   rev = ""; # When using a Git commit
   rev-version = ""; # When using a Git commit
@@ -30,7 +30,7 @@ let
     owner = "llvm";
     repo = "llvm-project";
     rev = if rev != "" then rev else "llvmorg-${version}";
-    sha256 = "sha256-bO13J5bhE4YVGvoaTuzFgf62HYh+Shv6T0u07CFjI9E=";
+    sha256 = "14wgrjwj02ivlwb1zgidacspkkcfpsqjmgd7r838qmwpk56yxl9f";
   };
 
   llvm_meta = {
diff --git a/pkgs/development/compilers/llvm/14/llvm/default.nix b/pkgs/development/compilers/llvm/14/llvm/default.nix
index d2059cc66ba23..05aac728b4521 100644
--- a/pkgs/development/compilers/llvm/14/llvm/default.nix
+++ b/pkgs/development/compilers/llvm/14/llvm/default.nix
@@ -209,6 +209,9 @@ in stdenv.mkDerivation (rec {
 
   checkTarget = "check-all";
 
+  # For the update script:
+  passthru.monorepoSrc = monorepoSrc;
+
   requiredSystemFeatures = [ "big-parallel" ];
   meta = llvm_meta // {
     homepage = "https://llvm.org/";
diff --git a/pkgs/development/compilers/llvm/14/openmp/default.nix b/pkgs/development/compilers/llvm/14/openmp/default.nix
index 2b580a9c169c9..622072b53e180 100644
--- a/pkgs/development/compilers/llvm/14/openmp/default.nix
+++ b/pkgs/development/compilers/llvm/14/openmp/default.nix
@@ -5,6 +5,7 @@
 , runCommand
 , cmake
 , llvm
+, lit
 , clang-unwrapped
 , perl
 , pkg-config
@@ -25,16 +26,27 @@ stdenv.mkDerivation rec {
 
   patches = [
     ./gnu-install-dirs.patch
-    ./fix-find-tool.patch
+    ./run-lit-directly.patch
   ];
 
   outputs = [ "out" "dev" ];
 
-  nativeBuildInputs = [ cmake perl pkg-config clang-unwrapped ];
+  nativeBuildInputs = [ cmake perl pkg-config lit ];
   buildInputs = [ llvm ];
 
+  # Unsup:Pass:XFail:Fail
+  # 26:267:16:8
+  doCheck = false;
+  checkTarget = "check-openmp";
+
+  preCheck = ''
+    patchShebangs ../tools/archer/tests/deflake.bash
+  '';
+
   cmakeFlags = [
-    "-DLIBOMPTARGET_BUILD_AMDGCN_BCLIB=OFF" # Building the AMDGCN device RTL currently fails
+    "-DCLANG_TOOL=${clang-unwrapped}/bin/clang"
+    "-DOPT_TOOL=${llvm}/bin/opt"
+    "-DLINK_TOOL=${llvm}/bin/llvm-link"
   ];
 
   meta = llvm_meta // {
@@ -50,6 +62,5 @@ stdenv.mkDerivation rec {
     # "All of the code is dual licensed under the MIT license and the UIUC
     # License (a BSD-like license)":
     license = with lib.licenses; [ mit ncsa ];
-    broken = true; # TODO: gnu-install-dirs.patch fails to apply
   };
 }
diff --git a/pkgs/development/compilers/llvm/14/openmp/fix-find-tool.patch b/pkgs/development/compilers/llvm/14/openmp/fix-find-tool.patch
deleted file mode 100644
index b5d0e7b417757..0000000000000
--- a/pkgs/development/compilers/llvm/14/openmp/fix-find-tool.patch
+++ /dev/null
@@ -1,54 +0,0 @@
-diff --git a/libomptarget/DeviceRTL/CMakeLists.txt b/libomptarget/DeviceRTL/CMakeLists.txt
-index 242df638f80d..a4654e96371f 100644
---- a/libomptarget/DeviceRTL/CMakeLists.txt
-+++ b/libomptarget/DeviceRTL/CMakeLists.txt
-@@ -25,16 +25,16 @@ endif()
- 
- if (LLVM_DIR)
-   # Builds that use pre-installed LLVM have LLVM_DIR set.
--  find_program(CLANG_TOOL clang PATHS ${LLVM_TOOLS_BINARY_DIR} NO_DEFAULT_PATH)
-+  find_program(CLANG_TOOL clang PATHS ${LLVM_TOOLS_BINARY_DIR} REQUIRED)
-   find_program(LINK_TOOL llvm-link PATHS ${LLVM_TOOLS_BINARY_DIR}
--    NO_DEFAULT_PATH)
--  find_program(OPT_TOOL opt PATHS ${LLVM_TOOLS_BINARY_DIR} NO_DEFAULT_PATH)
-+    REQUIRED)
-+  find_program(OPT_TOOL opt PATHS ${LLVM_TOOLS_BINARY_DIR} REQUIRED)
-   libomptarget_say("Building DeviceRTL. Using clang: ${CLANG_TOOL}")
- elseif (LLVM_TOOL_CLANG_BUILD AND NOT CMAKE_CROSSCOMPILING AND NOT OPENMP_STANDALONE_BUILD)
-   # LLVM in-tree builds may use CMake target names to discover the tools.
--  set(CLANG_TOOL $<TARGET_FILE:clang>)
--  set(LINK_TOOL $<TARGET_FILE:llvm-link>)
--  set(OPT_TOOL $<TARGET_FILE:opt>)
-+  set(CLANG_TOOL $<TARGET_FILE:clang> REQUIRED)
-+  set(LINK_TOOL $<TARGET_FILE:llvm-link> REQUIRED)
-+  set(OPT_TOOL $<TARGET_FILE:opt> REQUIRED)
-   libomptarget_say("Building DeviceRTL. Using clang from in-tree build")
- else()
-   libomptarget_say("Not building DeviceRTL. No appropriate clang found")
-diff --git a/libomptarget/deviceRTLs/amdgcn/CMakeLists.txt b/libomptarget/deviceRTLs/amdgcn/CMakeLists.txt
-index 3f4c02671aeb..be9f4677d7b5 100644
---- a/libomptarget/deviceRTLs/amdgcn/CMakeLists.txt
-+++ b/libomptarget/deviceRTLs/amdgcn/CMakeLists.txt
-@@ -38,16 +38,16 @@ endif()
- 
- if (LLVM_DIR)
-   # Builds that use pre-installed LLVM have LLVM_DIR set.
--  find_program(CLANG_TOOL clang PATHS ${LLVM_TOOLS_BINARY_DIR} NO_DEFAULT_PATH)
-+  find_program(CLANG_TOOL clang PATHS ${LLVM_TOOLS_BINARY_DIR} REQUIRED)
-   find_program(LINK_TOOL llvm-link PATHS ${LLVM_TOOLS_BINARY_DIR}
--    NO_DEFAULT_PATH)
--  find_program(OPT_TOOL opt PATHS ${LLVM_TOOLS_BINARY_DIR} NO_DEFAULT_PATH)
-+    REQUIRED)
-+  find_program(OPT_TOOL opt PATHS ${LLVM_TOOLS_BINARY_DIR} REQUIRED)
-   libomptarget_say("Building AMDGCN device RTL. Using clang: ${CLANG_TOOL}")
- elseif (LLVM_TOOL_CLANG_BUILD AND NOT CMAKE_CROSSCOMPILING AND NOT OPENMP_STANDALONE_BUILD)
-   # LLVM in-tree builds may use CMake target names to discover the tools.
--  set(CLANG_TOOL $<TARGET_FILE:clang>)
--  set(LINK_TOOL $<TARGET_FILE:llvm-link>)
--  set(OPT_TOOL $<TARGET_FILE:opt>)
-+  set(CLANG_TOOL $<TARGET_FILE:clang> REQUIRED)
-+  set(LINK_TOOL $<TARGET_FILE:llvm-link> REQUIRED)
-+  set(OPT_TOOL $<TARGET_FILE:opt> REQUIRED)
-   libomptarget_say("Building AMDGCN device RTL. Using clang from in-tree build")
- else()
-   libomptarget_say("Not building AMDGCN device RTL. No appropriate clang found")
diff --git a/pkgs/development/compilers/llvm/14/openmp/gnu-install-dirs.patch b/pkgs/development/compilers/llvm/14/openmp/gnu-install-dirs.patch
index 352a469231158..e85fde46ca3fc 100644
--- a/pkgs/development/compilers/llvm/14/openmp/gnu-install-dirs.patch
+++ b/pkgs/development/compilers/llvm/14/openmp/gnu-install-dirs.patch
@@ -1,17 +1,7 @@
 diff --git a/CMakeLists.txt b/CMakeLists.txt
-index 7f11a05f5622..fb90f8f6a49b 100644
 --- a/CMakeLists.txt
 +++ b/CMakeLists.txt
-@@ -8,6 +8,8 @@ if (OPENMP_STANDALONE_BUILD OR "${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_CURRENT_S
-   set(OPENMP_STANDALONE_BUILD TRUE)
-   project(openmp C CXX)
- 
-+  include(GNUInstallDirs)
-+
-   # CMAKE_BUILD_TYPE was not set, default to Release.
-   if (NOT CMAKE_BUILD_TYPE)
-     set(CMAKE_BUILD_TYPE Release)
-@@ -19,7 +21,7 @@ if (OPENMP_STANDALONE_BUILD OR "${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_CURRENT_S
+@@ -24,7 +24,7 @@ if (OPENMP_STANDALONE_BUILD)
    set(OPENMP_LIBDIR_SUFFIX "" CACHE STRING
      "Suffix of lib installation directory, e.g. 64 => lib64")
    # Do not use OPENMP_LIBDIR_SUFFIX directly, use OPENMP_INSTALL_LIBDIR.
@@ -20,7 +10,7 @@ index 7f11a05f5622..fb90f8f6a49b 100644
  
    # Group test settings.
    set(OPENMP_TEST_C_COMPILER ${CMAKE_C_COMPILER} CACHE STRING
-@@ -30,7 +32,7 @@ if (OPENMP_STANDALONE_BUILD OR "${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_CURRENT_S
+@@ -35,7 +35,7 @@ if (OPENMP_STANDALONE_BUILD)
  else()
    set(OPENMP_ENABLE_WERROR ${LLVM_ENABLE_WERROR})
    # If building in tree, we honor the same install suffix LLVM uses.
@@ -29,10 +19,10 @@ index 7f11a05f5622..fb90f8f6a49b 100644
  
    if (NOT MSVC)
      set(OPENMP_TEST_C_COMPILER ${LLVM_RUNTIME_OUTPUT_INTDIR}/clang)
-index 0e1ce2afd154..8b3810f83713 100644
+diff --git a/libomptarget/plugins/amdgpu/CMakeLists.txt b/libomptarget/plugins/amdgpu/CMakeLists.txt
 --- a/libomptarget/plugins/amdgpu/CMakeLists.txt
 +++ b/libomptarget/plugins/amdgpu/CMakeLists.txt
-@@ -80,7 +80,7 @@ add_library(omptarget.rtl.amdgpu SHARED
+@@ -74,7 +74,7 @@ add_library(omptarget.rtl.amdgpu SHARED
  
  # Install plugin under the lib destination folder.
  # When we build for debug, OPENMP_LIBDIR_SUFFIX get set to -debug
@@ -42,7 +32,6 @@ index 0e1ce2afd154..8b3810f83713 100644
  
  if(CMAKE_SYSTEM_NAME MATCHES "FreeBSD")
 diff --git a/libomptarget/plugins/ve/CMakeLists.txt b/libomptarget/plugins/ve/CMakeLists.txt
-index 16ce0891ca23..db30ee9c769f 100644
 --- a/libomptarget/plugins/ve/CMakeLists.txt
 +++ b/libomptarget/plugins/ve/CMakeLists.txt
 @@ -32,7 +32,7 @@ if(${LIBOMPTARGET_DEP_VEO_FOUND})
@@ -54,36 +43,3 @@ index 16ce0891ca23..db30ee9c769f 100644
  
    target_link_libraries(
      "omptarget.rtl.${tmachine_libname}"
-diff --git a/runtime/src/CMakeLists.txt b/runtime/src/CMakeLists.txt
-index e4f4e6e1e73f..1164b3b22b0e 100644
---- a/runtime/src/CMakeLists.txt
-+++ b/runtime/src/CMakeLists.txt
-@@ -346,13 +346,13 @@ add_dependencies(libomp-micro-tests libomp-test-deps)
- # We want to install libomp in DESTDIR/CMAKE_INSTALL_PREFIX/lib
- # We want to install headers in DESTDIR/CMAKE_INSTALL_PREFIX/include
- if(${OPENMP_STANDALONE_BUILD})
--  set(LIBOMP_HEADERS_INSTALL_PATH include)
-+  set(LIBOMP_HEADERS_INSTALL_PATH "${CMAKE_INSTALL_INCLUDEDIR}")
- else()
-   string(REGEX MATCH "[0-9]+\\.[0-9]+(\\.[0-9]+)?" CLANG_VERSION ${PACKAGE_VERSION})
-   set(LIBOMP_HEADERS_INSTALL_PATH "${OPENMP_INSTALL_LIBDIR}/clang/${CLANG_VERSION}/include")
- endif()
- if(WIN32)
--  install(TARGETS omp RUNTIME DESTINATION bin)
-+  install(TARGETS omp RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
-   install(TARGETS ${LIBOMP_IMP_LIB_TARGET} ARCHIVE DESTINATION "${OPENMP_INSTALL_LIBDIR}")
-   # Create aliases (regular copies) of the library for backwards compatibility
-   set(LIBOMP_ALIASES "libiomp5md")
-diff --git a/tools/multiplex/CMakeLists.txt b/tools/multiplex/CMakeLists.txt
-index 64317c112176..4002784da736 100644
---- a/tools/multiplex/CMakeLists.txt
-+++ b/tools/multiplex/CMakeLists.txt
-@@ -4,7 +4,7 @@ if(LIBOMP_OMPT_SUPPORT)
-   add_library(ompt-multiplex INTERFACE)
-   target_include_directories(ompt-multiplex INTERFACE ${CMAKE_CURRENT_SOURCE_DIR})
- 
--  install(FILES ompt-multiplex.h DESTINATION include)
-+  install(FILES ompt-multiplex.h DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
- 
-   add_subdirectory(tests)
- endif()
diff --git a/pkgs/development/compilers/llvm/14/openmp/run-lit-directly.patch b/pkgs/development/compilers/llvm/14/openmp/run-lit-directly.patch
new file mode 100644
index 0000000000000..1e952fdc36a8f
--- /dev/null
+++ b/pkgs/development/compilers/llvm/14/openmp/run-lit-directly.patch
@@ -0,0 +1,12 @@
+diff --git a/cmake/OpenMPTesting.cmake b/cmake/OpenMPTesting.cmake
+--- a/cmake/OpenMPTesting.cmake
++++ b/cmake/OpenMPTesting.cmake
+@@ -185,7 +185,7 @@ function(add_openmp_testsuite target comment)
+   if (${OPENMP_STANDALONE_BUILD})
+     set(LIT_ARGS ${OPENMP_LIT_ARGS} ${ARG_ARGS})
+     add_custom_target(${target}
+-      COMMAND ${PYTHON_EXECUTABLE} ${OPENMP_LLVM_LIT_EXECUTABLE} ${LIT_ARGS} ${ARG_UNPARSED_ARGUMENTS}
++      COMMAND ${OPENMP_LLVM_LIT_EXECUTABLE} ${LIT_ARGS} ${ARG_UNPARSED_ARGUMENTS}
+       COMMENT ${comment}
+       DEPENDS ${ARG_DEPENDS}
+       USES_TERMINAL
diff --git a/pkgs/development/compilers/llvm/update.sh b/pkgs/development/compilers/llvm/update.sh
index 603c603f275b1..95ad356dbd9a9 100755
--- a/pkgs/development/compilers/llvm/update.sh
+++ b/pkgs/development/compilers/llvm/update.sh
@@ -20,7 +20,11 @@ sed -Ei \
 
 readonly ATTRSET="llvmPackages_$VERSION_MAJOR"
 
-if [ "$VERSION_MAJOR" -ge "13" ]; then
+if [ "$VERSION_MAJOR" -ge "14" ]; then
+  readonly SOURCES=(
+    "llvm.monorepoSrc"
+  )
+elif [ "$VERSION_MAJOR" -eq "13" ]; then
   readonly SOURCES=(
     "llvm.src"
   )
@@ -43,7 +47,7 @@ fi
 for SOURCE in "${SOURCES[@]}"; do
   echo "Updating the hash of $SOURCE:"
   declare ATTR="$ATTRSET.$SOURCE"
-  declare OLD_HASH="$(nix eval -f . $ATTR.outputHash)"
+  declare OLD_HASH="$(nix --extra-experimental-features nix-command eval -f . $ATTR.outputHash)"
   declare NEW_HASH="\"$(nix-prefetch-url -A $ATTR)\""
   find "$DIR" -type f -exec sed -i "s/$OLD_HASH/$NEW_HASH/" {} +
 done