[compiler-rt] [compiler-rt] Propagate sysroot from CMake to msan tests (PR #132299)

[via llvm-commits]

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@@ -6,6 +6,7 @@ config.target_cflags = "@MSAN_TEST_TARGET_CFLAGS@"
 config.target_arch = "@MSAN_TEST_TARGET_ARCH@"
 config.use_lld = @MSAN_TEST_USE_LLD@
 config.use_thinlto = @MSAN_TEST_USE_THINLTO@
+config.cmake_sysroot = "@CMAKE_SYSROOT@"
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zeroomega wrote:

I tried but run into an issue with lit's glibc features detection and it caused segfault when running test: preinit_array.cpp

The reason is that `MSAN_TEST_TARGET_CFLAGS` is used when detecting the test's runtime glibc version: https://github.com/llvm/llvm-project/blob/118757af11954ffd43c16a41e39348e0907bba92/compiler-rt/test/lit.common.cfg.py#L682

Putting the --sysroot into the target cflag causes the 'unsupported' tag to fail in 
https://github.com/llvm/llvm-project/blob/118757af11954ffd43c16a41e39348e0907bba92/compiler-rt/test/msan/preinit_array.cpp#L4 

Because now the check only applies to the build time glibc version, not the runtime one.



https://github.com/llvm/llvm-project/pull/132299