forked from OSchip/llvm-project
4fcebf6cf6
Summary: Any invocation of `clang -fuse-ld=lld` that results in a link command on a macOS host currently fails, because the Darwin lld driver does not recognize the `-lto_library` option that Clang passes it. Fix the error by having the Darwin driver ignore the option. The Clang driver's macOS toolchain is written such that it will always pass the `-lto_library` option to the linker invocation on a macOS host. And although the DarwinLdDriver is written to ignore any unknown arguments, because `-lto_library` begins with `-l`, the DarwinLdDriver interprets it as a library search command, for a library named "to_library". When the DarwinLdDriver is unable to find a library specified via `-l`, it exits with a hard error. This causes any invocation of `clang -fuse-ld=lld` that results in a link command on a macOS host to fail with an error. To fix the issue, I considered two alternatives: 1. Modify the Clang Darwin toolchain to only pass `-lto_library` if lld is *not* being used. lld doesn't support LTO on Darwin anyway, so it can't use the option. However, I opted against this because, if and when lld *does* support LTO on Darwin, I'll have to make another commit to Clang in order to get it to pass the option to lld again. 2. Modify the Darwin lld driver to ignore the `-lto_library` option. Just in case users may take this to mean LTO is supported, I also added a warning. If and when lld supports LTO on Darwin, the same commit that adds support for this option can remove the warning. Option (2) seemed better to me, and is the rationale behind this commit. Test Plan: check-lld Reviewers: ruiu, smeenai, pcc Reviewed By: smeenai Subscribers: JDevlieghere, pcc, mehdi_amini, inglorion, steven_wu, llvm-commits Differential Revision: https://reviews.llvm.org/D47994 llvm-svn: 334641 |
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| Core | ||
| Driver | ||
| ReaderWriter | ||
| CMakeLists.txt | ||