release/20.x: [libcxx] [test] Fix restoring LLVM_DIR and Clang_DIR (#132838) #133153
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@mordante What do you think about merging this PR to the release branch? |
llvmbot
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@llvm/pr-subscribers-libcxx Author: None (llvmbot) ChangesBackport 51bceb4 Requested by: @mstorsjo Full diff: https://github.com/llvm/llvm-project/pull/133153.diff 1 Files Affected:
diff --git a/libcxx/test/tools/clang_tidy_checks/CMakeLists.txt b/libcxx/test/tools/clang_tidy_checks/CMakeLists.txt
index 0f8f0e8864d0f..da045fac92ce4 100644
--- a/libcxx/test/tools/clang_tidy_checks/CMakeLists.txt
+++ b/libcxx/test/tools/clang_tidy_checks/CMakeLists.txt
@@ -8,6 +8,10 @@ set(Clang_DIR_SAVE ${Clang_DIR})
# versions must match. Otherwise there likely will be ODR-violations. This had
# led to crashes and incorrect output of the clang-tidy based checks.
find_package(Clang ${CMAKE_CXX_COMPILER_VERSION})
+
+set(LLVM_DIR "${LLVM_DIR_SAVE}" CACHE PATH "The directory containing a CMake configuration file for LLVM." FORCE)
+set(Clang_DIR "${Clang_DIR_SAVE}" CACHE PATH "The directory containing a CMake configuration file for Clang." FORCE)
+
if(NOT Clang_FOUND)
message(STATUS "Clang-tidy tests are disabled since the "
"Clang development package is unavailable.")
@@ -19,9 +23,6 @@ if(NOT TARGET clangTidy)
return()
endif()
-set(LLVM_DIR "${LLVM_DIR_SAVE}" CACHE PATH "The directory containing a CMake configuration file for LLVM." FORCE)
-set(Clang_DIR "${Clang_DIR_SAVE}" CACHE PATH "The directory containing a CMake configuration file for Clang." FORCE)
-
message(STATUS "Found system-installed LLVM ${LLVM_PACKAGE_VERSION} with headers in ${LLVM_INCLUDE_DIRS}")
set(CMAKE_CXX_STANDARD 20)
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In 664f345, a fix was introduced, attempting to restore LLVM_DIR and Clang_DIR after doing find_package(Clang). However, 6775285 added a return if the clangTidy target wasn't found. If this is hit, we don't restore LLVM_DIR and Clang_DIR, which causes strange effects if CMake is rerun a second time. Move the code for restoring LLVM_DIR and Clang_DIR to directly after the find_package calls, to make sure they are restored, regardless of the find_package outcome. (cherry picked from commit 51bceb4)
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@mstorsjo (or anyone else). If you would like to add a note about this fix in the release notes (completely optional). Please reply to this comment with a one or two sentence description of the fix. When you are done, please add the release:note label to this PR. |
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Backport 51bceb4
Requested by: @mstorsjo