================
@@ -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
"" FORCE)
+set(LLVM_ENABLE_PROJECTS "clang;lld" CACHE STRING "" FORCE)
+
+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
"")
----------------
tstellar wrote:
It uses ThinLTO:
https://gitlab.kitware.com/cmake/cmake/-/blob/master/Modules/Compiler/Clang.cmake?ref_type=heads#L62
https://github.com/llvm/llvm-project/pull/117802
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