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🩹 Disable ASan on macOS 14/15 with LLVM/Clang 22+ #60

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Merged
kammce merged 1 commit into from
Oct 12, 2026
Merged

🩹 Disable ASan on macOS 14/15 with LLVM/Clang 22+ #60

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46 changes: 32 additions & 14 deletions v5/cmake/LibhalTesting.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -58,29 +58,47 @@ function(_libhal_add_tests_impl TARGET_NAME)

message(STATUS "Adding tests for ${TARGET_NAME}")

# Detect upstream LLVM/Clang 20 on macOS 26+, where AddressSanitizer's
# runtime initialization is known to deadlock (spins forever in
# __asan::AsanInitFromRtl / StaticSpinMutex::LockSlow before main() is
# ever reached, both under a debugger and standalone).
if(APPLE AND NOT DEFINED CACHE{LIBHAL_ASAN_MACOS26_CLANG20_CHECKED})
set(LIBHAL_ASAN_MACOS26_CLANG20_CHECKED TRUE CACHE INTERNAL "")
# Disable AddressSanitizer on macOS where it is known not to work:
#
# - Upstream LLVM/Clang 20 on macOS 26+: the ASan runtime deadlocks during
# initialization (spins forever in __asan::AsanInitFromRtl /
# StaticSpinMutex::LockSlow before main() is ever reached).
# - Upstream LLVM/Clang 22+ on macOS 14/15: llvm-toolchain links programs
# against its bundled libc++ there, but the ASan runtime is linked
# against the system libc++. Both end up in one process, objects from
# one are freed by the other, and ASan aborts (e.g. "attempting free on
# address which was not malloc()-ed" in std::locale::~locale at exit).
if(APPLE AND NOT DEFINED CACHE{LIBHAL_ASAN_MACOS_CHECKED})
set(LIBHAL_ASAN_MACOS_CHECKED TRUE CACHE INTERNAL "")
execute_process(
COMMAND sw_vers -productVersion
OUTPUT_VARIABLE LIBHAL_MACOS_VERSION
OUTPUT_STRIP_TRAILING_WHITESPACE
)
if(LIBHAL_MACOS_VERSION VERSION_GREATER_EQUAL "26" AND
CMAKE_CXX_COMPILER_ID STREQUAL "Clang" AND
CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL "20" AND
CMAKE_CXX_COMPILER_VERSION VERSION_LESS "21")
set(LIBHAL_DISABLE_ASAN FALSE CACHE INTERNAL "")
if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
if(LIBHAL_MACOS_VERSION VERSION_GREATER_EQUAL "26" AND
CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL "20" AND
CMAKE_CXX_COMPILER_VERSION VERSION_LESS "21")
set(LIBHAL_ASAN_DISABLE_REASON
"AddressSanitizer is known to deadlock during runtime "
"initialization on this combination.")
elseif(LIBHAL_MACOS_VERSION VERSION_GREATER_EQUAL "14" AND
LIBHAL_MACOS_VERSION VERSION_LESS "26" AND
CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL "22")
set(LIBHAL_ASAN_DISABLE_REASON
"the toolchain's bundled libc++ conflicts with the "
"system libc++ that the ASan runtime links against.")
endif()
endif()
if(DEFINED LIBHAL_ASAN_DISABLE_REASON)
set(LIBHAL_DISABLE_ASAN TRUE CACHE INTERNAL "")
string(JOIN "" LIBHAL_ASAN_DISABLE_REASON
${LIBHAL_ASAN_DISABLE_REASON})
message(WARNING
"⚠️ Detected macOS ${LIBHAL_MACOS_VERSION} with LLVM/Clang "
"${CMAKE_CXX_COMPILER_VERSION}: AddressSanitizer is known to "
"deadlock during runtime initialization on this combination. "
"${CMAKE_CXX_COMPILER_VERSION}: ${LIBHAL_ASAN_DISABLE_REASON} "
"Disabling ASan for test targets.")
else()
set(LIBHAL_DISABLE_ASAN FALSE CACHE INTERNAL "")
endif()
endif()

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