Fix finding LLD on Homebrew when multiple versions are installed.#8619
Merged
alexreinking merged 1 commit intomainfrom Apr 24, 2025
Merged
Fix finding LLD on Homebrew when multiple versions are installed.#8619alexreinking merged 1 commit intomainfrom
alexreinking merged 1 commit intomainfrom
Conversation
LLVM sadly doesn't provide *ConfigVersion.cmake files for its sub-components, including Clang and LLD. Consequently, attempting to constrain the version to LLVM_PACKAGE_VERSION prevents these find_package calls from succeeding at all. Worse, package maintainers have some "interesting" ideas as to how they should lay out the -dev packages, especially when they want to support multiple parallel versions. These hints take effect at a lower precedence than Halide_LLVM_ROOT or CMAKE_PREFIX_PATH (which are the standard ways of setting up the dependency search), but at a higher precedence than the system-wide fallback locations. In particular, Homebrew split the LLVM and LLD packages as of version 19, so having multiple LLVM versions installed leads to the newest LLD being found without the hint in this commit.
abadams
approved these changes
Apr 23, 2025
Member
Author
|
Failures are due to buildbot issues: missing Node environment and some corrupt PCH. |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
LLVM sadly doesn't provide *ConfigVersion.cmake files for its sub-components, including Clang and LLD. Consequently, attempting to constrain the version to
LLVM_PACKAGE_VERSIONprevents these find_package calls from succeeding at all. Worse, package maintainers have some "interesting" ideas as to how they should lay out the-devpackages, especially when they want to support multiple parallel versions. These hints take effect at a lower precedence thanHalide_LLVM_ROOTorCMAKE_PREFIX_PATH(which are the standard ways of setting up the dependency search), but at a higher precedence than the system-wide fallback locations.In particular, Homebrew split the LLVM and LLD packages as of version 19, so having multiple LLVM versions installed leads to the newest LLD being found without the hint in this commit.