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[clang] fix clang_cmake_builddir (#155844)

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When building llvm from a subdirectory (like clspv does)
`CMAKE_BINARY_DIR` is at the top of the build directory.

When building runtimes (libclc for example), the build fails looking for
clang (through `find_package` looking at `LLVM_BINARY_DIR` with
`NO_DEFAULT_PATH` & `NO_CMAKE_FIND_ROOT_PATH`) because clang is not in
`LLVM_BINARY_DIR`.

Fix that issue by setting `clang_cmake_builddir` the same way we set
`llvm_cmake_builddir` from `LLVM_BINARY_DIR`.

For default llvm build (using llvm as the main cmake project), it should
not change anything.
This commit is contained in:
Romaric Jodin
2025-09-12 15:08:13 +02:00
committed by GitHub
parent 45f6c50158
commit 61664b6103
1 changed files with 3 additions and 4 deletions
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7
clang/cmake/modules/CMakeLists.txt
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@@ -8,15 +8,14 @@ include(FindPrefixFromConfig)
# the usual CMake convention seems to be ${Project}Targets.cmake.
set(CLANG_INSTALL_PACKAGE_DIR "${CMAKE_INSTALL_PACKAGEDIR}/clang" CACHE STRING
"Path for CMake subdirectory for Clang (defaults to '${CMAKE_INSTALL_PACKAGEDIR}/clang')")
# CMAKE_INSTALL_PACKAGEDIR might be absolute, so don't reuse below.
set(clang_cmake_builddir "${CMAKE_BINARY_DIR}/lib${LLVM_LIBDIR_SUFFIX}/cmake/clang")
# Keep this in sync with llvm/cmake/CMakeLists.txt!
set(LLVM_INSTALL_PACKAGE_DIR "${CMAKE_INSTALL_PACKAGEDIR}/llvm" CACHE STRING
"Path for CMake subdirectory for LLVM (defaults to '${CMAKE_INSTALL_PACKAGEDIR}/llvm')")
# CMAKE_INSTALL_PACKAGEDIR might be absolute, so don't reuse below.
string(REPLACE "${CMAKE_CFG_INTDIR}" "." llvm_cmake_builddir "${LLVM_LIBRARY_DIR}")
set(llvm_cmake_builddir "${llvm_cmake_builddir}/cmake/llvm")
string(REPLACE "${CMAKE_CFG_INTDIR}" "." llvm_builddir "${LLVM_LIBRARY_DIR}")
set(llvm_cmake_builddir "${llvm_builddir}/cmake/llvm")
set(clang_cmake_builddir "${llvm_builddir}/cmake/clang")
get_property(CLANG_EXPORTS GLOBAL PROPERTY CLANG_EXPORTS)
export(TARGETS ${CLANG_EXPORTS} FILE ${clang_cmake_builddir}/ClangTargets.cmake)