e9ba0e6bf0
After #171941, there are two issues: First, some buildbots that use the old-style build are failing at: ``` Target ${BUILTIN_LIB_TARGET_NAME} does not exist" ``` Example failure: https://lab.llvm.org/buildbot/#/builders/139/builds/25097 ...during CMake configure. This appears to be caused by mismatch between the builtin library's _target_ name and the output name from set_output_name. This reverts the change to BUILTIN_LIB_TARGET_NAME made by #171941, but still use the output name for naming the .sources.txt file used for configuring builtins tests. Second, this speculatively fixes an issue caused by two builtins libraries that are produced with the same name in different directories because of `LLVM_ENABLE_PER_TARGET_RUNTIME_DIR` (e.g. `lib/clang/22/lib/i386-unknown-linux-gnu/libclang_rt.builtins.a` and `lib/clang/22/lib/x86_64-unknown-linux-gnu/libclang_rt.builtins.a`), and thus the `.sources.txt` paths alias. This causes us to run the wrong tests against one of the builtins libraries. The chosen fix is to store the .sources.txt files in `get_compiler_rt_output_dir` (which takes `LLVM_ENABLE_PER_TARGET_RUNTIME_DIR` into account) rather than `CMAKE_BINARY_DIR`. As a side-effect, this allows for the replacement of `COMPILER_RT_TEST_BUILTINS_DIR` with a simpler boolean option `COMPILER_RT_TEST_EXTERNAL_BUILTINS`. Example failure: https://lab.llvm.org/buildbot/#/builders/66/builds/24433
Compiler-RT ================================ This directory and its subdirectories contain source code for the compiler support routines. Compiler-RT is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt. ================================