[python] [tests] Disable python binding tests when building with LLVM_USE_SANITIZER=Address

[NoQ]

Summary

@mgorny: These fail for me on macOS too, if LLVM is configured as

cmake ../llvm/ -DCMAKE_BUILD_TYPE=Release -DLLVM_USE_SANITIZER=Address

I guess we might have to outright disable them under -DLLVM_USE_SANITIZER=Address.

Patch actually by Dan "@delcypher" Liew, I'm just passing by.

[delcypher]

LGTM. But then I would say that because I wrote the patch 😛...

[mgorny]

WFM. Thanks for analyzing the problem.

bindings/python/tests/CMakeLists.txt

27 ↗

(On Diff #169535)

Hmm, I don't think you need to parenthesize the (NOT FOO) thing (and it looks bit weird to me).

cfe/trunk/bindings/python/tests/CMakeLists.txt

 # Test target to run Python test suite from main build.
 
 add_custom_target(check-clang-python
     COMMAND ${CMAKE_COMMAND} -E env
             CLANG_LIBRARY_PATH=$<TARGET_FILE_DIR:libclang>
             ${PYTHON_EXECUTABLE} -m unittest discover
     DEPENDS libclang
     WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/..)
 
+# Check if we are building with ASan
+list(FIND LLVM_USE_SANITIZER "Address" LLVM_USE_ASAN_INDEX)
+if (LLVM_USE_ASAN_INDEX EQUAL -1)
+  set(LLVM_USE_ASAN FALSE)
+else()
+  set(LLVM_USE_ASAN TRUE)
+endif()
+
 # Tests fail on Windows, and need someone knowledgeable to fix.
 # It's not clear whether it's a test or a valid binding problem.
-if(NOT WIN32)
+#
+# Do not try to run if libclang was built with ASan because
+# the sanitizer library will likely be loaded too late to perform
+# interception and will then fail.
+# We could use LD_PRELOAD/DYLD_INSERT_LIBRARIES but this isn't
+# portable so its easier just to not run the tests when building
+# with ASan.
+if((NOT WIN32) AND (NOT LLVM_USE_ASAN))
     set_property(GLOBAL APPEND PROPERTY
                  LLVM_ADDITIONAL_TEST_TARGETS check-clang-python)
 endif()