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[cmake] Fix dependency issue in TableGen
Summary: There is a bug in add_tablegen which causes cmake to fail with the following error message if LLVM_TABLEGEN is set. CMake Error at cmake/modules/TableGen.cmake:147 (add_dependencies): The dependency target "LLVM-tablegen-host" of target "CLANG-tablegen-host" does not exist. Call Stack (most recent call first): tools/clang/utils/TableGen/CMakeLists.txt:3 (add_tablegen) The issue happens because setting LLVM_TABLEGEN causes cmake to skip generating the LLVM-tablegen-host target. As a result, a non-existent target was added for CLANG-tablegen-host causing cmake to fail. In order to fix this issue, this patch adds a guard to check the validity of the dependency target before adding it as a dependency. Reviewers: aganea, smeenai Reviewed By: aganea Subscribers: mgorny, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D60576 llvm-svn: 358226
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