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[compiler-rt] Check for and use -lunwind when linking with -nodefaultlibs #65912

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Sep 15, 2023
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[compiler-rt] Check for and use -lunwind when linking with -nodefaultlibs #65912

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6 changes: 6 additions & 0 deletions compiler-rt/cmake/config-ix.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -63,6 +63,12 @@ if (C_SUPPORTS_NODEFAULTLIBS_FLAG)
moldname mingwex msvcrt)
list(APPEND CMAKE_REQUIRED_LIBRARIES ${MINGW_LIBRARIES})
endif()
check_library_exists(unwind _Unwind_RaiseException "" COMPILER_RT_HAS_LIBUNWIND)
if (COMPILER_RT_HAS_LIBUNWIND)
# If we're omitting default libraries, we might need to manually link in libunwind.
# This can affect whether we detect a statically linked libc++ correctly.
list(APPEND CMAKE_REQUIRED_LIBRARIES unwind)
endif()
endif ()

# CodeGen options.
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