diff --git a/clang/cmake/caches/llvm-toolchain/stage1.cmake b/clang/cmake/caches/llvm-toolchain/stage1.cmake
new file mode 100644
index 0000000000000..b3e76eee43c25
--- /dev/null
+++ b/clang/cmake/caches/llvm-toolchain/stage1.cmake
@@ -0,0 +1,17 @@
+# Stage 1
+# * Build an LTO optimized libcxx, so we can staticially link it into stage 2
+#   clang.
+
+
+set(CMAKE_BUILD_TYPE Release CACHE STRING "")
+set(LLVM_TARGETS_TO_BUILD Native CACHE STRING "")
+set(LLVM_ENABLE_RUNTIMES compiler-rt libcxx libcxxabi libunwind CACHE STRING "")
+set(LLVM_ENABLE_PROJECTS clang lld CACHE STRING "")
+
+set(CLANG_ENABLE_BOOTSTRAP ON CACHE BOOL "")
+set(CLANG_BOOTSTRAP_CMAKE_ARGS -C ${CMAKE_CURRENT_LIST_DIR}/stage2-instrumented.cmake CACHE BOOL "")
+set(BOOTSTRAP_LLVM_BUILD_INSTRUMENTED IR CACHE BOOL "")
+set(CLANG_BOOTSTRAP_TARGETS stage2-check-all stage2-distribution stage2-install-distribution stage2-clang stage2-clang-bolt CACHE BOOL "")
+set(LIBCXX_STATICALLY_LINK_ABI_IN_STATIC_LIBRARY ON CACHE STRING "")
+set(RUNTIMES_CMAKE_ARGS "-DCMAKE_INTERPROCEDURAL_OPTIMIZATION=ON" CACHE STRING "")
+set(LLVM_ENABLE_LLD ON CACHE STRING "")
diff --git a/clang/cmake/caches/llvm-toolchain/stage2-instrumented.cmake b/clang/cmake/caches/llvm-toolchain/stage2-instrumented.cmake
new file mode 100644
index 0000000000000..783b8e0b2067e
--- /dev/null
+++ b/clang/cmake/caches/llvm-toolchain/stage2-instrumented.cmake
@@ -0,0 +1,11 @@
+# Stage 2 instrumented:
+# * Build an instrumented clang, so we can generate profile data for stage 2.
+
+
+set(CLANG_ENABLE_BOOTSTRAP ON CACHE BOOL "")
+set(LLVM_BUILD_INSTRUMENTED IR CACHE STRING "")
+set(CLANG_BOOTSTRAP_CMAKE_ARGS -C ${CMAKE_CURRENT_LIST_DIR}/stage2.cmake CACHE STRING "")
+set(CLANG_BOOTSTRAP_TARGETS clang check-all distribution install-distribution clang-bolt CACHE STRING "")
+set(CLANG_BOLT OFF CACHE STRING "")
+
+include(${CMAKE_CURRENT_LIST_DIR}/stage2.cmake)
diff --git a/clang/cmake/caches/llvm-toolchain/stage2.cmake b/clang/cmake/caches/llvm-toolchain/stage2.cmake
new file mode 100644
index 0000000000000..40c200c3f715f
--- /dev/null
+++ b/clang/cmake/caches/llvm-toolchain/stage2.cmake
@@ -0,0 +1,17 @@
+# Stage 2:
+# * This is the final stage.
+# * The goal is to have a clang that is LTO, PGO, and bolt optimized and also
+#   statically linked to libcxx and compiler-rt.
+
+set(LLVM_TARGETS_TO_BUILD Native CACHE STRING "")
+set(LLVM_ENABLE_RUNTIMES compiler-rt libcxx libcxxabi libunwind CACHE STRING "" FORCE)
+set(LLVM_ENABLE_PROJECTS clang lld bolt CACHE STRING "" FORCE)
+set(LLVM_ENABLE_LLD ON CACHE BOOL "")
+set(LLVM_ENABLE_LTO THIN CACHE STRING "")
+set(LLVM_ENABLE_LIBCXX ON CACHE BOOL "")
+set(LLVM_STATIC_LINK_CXX_STDLIB ON CACHE BOOL "")
+set(CLANG_BOLT "INSTRUMENT" CACHE STRING "")
+set(CMAKE_EXE_LINKER_FLAGS "-Wl,--emit-relocs,-znow -rtlib=compiler-rt --unwindlib=libunwind -static-libgcc" CACHE STRING "")
+set(CMAKE_SHARED_LINKER_FLAGS "-rtlib=compiler-rt --unwindlib=libunwind -static-libgcc" CACHE STRING "")
+set(CMAKE_MODULE_LINKER_FLAGS "-rtlib=compiler-rt --unwindlib=libunwind -static-libgcc" CACHE STRING "")
+set(LLVM_DISTRIBUTION_COMPONENTS clang lld runtimes clang-resource-headers CACHE STRING "")
diff --git a/clang/cmake/caches/llvm-toolchain/usage.rst b/clang/cmake/caches/llvm-toolchain/usage.rst
new file mode 100644
index 0000000000000..fff580899d934
--- /dev/null
+++ b/clang/cmake/caches/llvm-toolchain/usage.rst
@@ -0,0 +1,19 @@
+# LLVM Toolchain Build
+
+This directory contains cache files for building a complete LLVM-based toolchain.
+The resulting clang build will be LTO, PGO, and BOLT optimized and statically
+linked against libc++ and compiler-rt.
+
+The build is done in 3 stages:
+
+* Stage 1: Build an LTO optimized libc++ with Stage 1 clang/lld.
+* Stage 2 Instrumented: Build clang with instrumentation in order to generate
+  profile data for PGO.
+* Stage 2: Build clang with LTO, PGO, and BOLT optimizations and statically link
+           with stage2 libc++ and compiler-rt.
+
+## Usage
+
+::
+  $ cmake -S llvm -B build -C clang/cmake/caches/llvm-toolchain/stage1.cmake
+  $ ninja stage2-install-distribution