PR for llvm/llvm-project#62699 #445
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@MaskRay @thesamesam @nikic What do you think about merging this PR to the release branch? |
…read This fixes some build bots if we reland D150505: specifically when using GCC to build LLVM and then `-fno-lifetime-dse` ends up passed to compile_commands.json and causing clang-tidy to pick up the Clang unknown option. (cherry picked from commit 626849c)
LLVM data structures like llvm::User and llvm::MDNode rely on the value of object storage persisting beyond the lifetime of the object (#24952). This is not standard compliant and causes a runtime crash if LLVM is built with GCC and LTO enabled (#57740). Until these issues are fixed, we need to disable dead store eliminations eliminations based on object lifetime. The previous test issues are fixed by 626849c. Bug: llvm/llvm-project#24952 Bug: llvm/llvm-project#57740 Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106943 Reviewed By: MaskRay, thesamesam, nikic Differential Revision: https://reviews.llvm.org/D150505 (cherry picked from commit 47f5c54)
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resolves llvm/llvm-project#62699