[compiler-rt] Check for and use -lunwind when linking with -nodefaultlibs #65912
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…libs If libc++ is available and should be used as the ubsan C++ ABI library, the check for libc++ might fail if libc++ is a static library, as the -nodefaultlibs flag inhibits a potential compiler default -lunwind. Just like the -nodefaultlibs configuration tests for and manually adds a bunch of compiler default libraries, look for -lunwind too.
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…odefaultlibs (#65912)" This reverts commit 64c0bdd. This seems to run into errors on some buildbots; configure errors out like this: -- Looking for _Unwind_RaiseException in unwind -- Looking for _Unwind_RaiseException in unwind - not found CMake Error at /usr/share/cmake-3.25/Modules/CheckLibraryExists.cmake:71 (try_compile): Only libraries may be used as try_compile or try_run IMPORTED LINK_LIBRARIES. Got unwind of type UTILITY. Call Stack (most recent call first): /b/sanitizer-aarch64-linux-fuzzer/build/llvm-project/compiler-rt/cmake/config-ix.cmake:66 (check_library_exists) /b/sanitizer-aarch64-linux-fuzzer/build/llvm-project/compiler-rt/CMakeLists.txt:281 (include)
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…libs (llvm#65912) If libc++ is available and should be used as the ubsan C++ ABI library, the check for libc++ might fail if libc++ is a static library, as the -nodefaultlibs flag inhibits a potential compiler default -lunwind. Just like the -nodefaultlibs configuration tests for and manually adds a bunch of compiler default libraries, look for -lunwind too.
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Sep 19, 2023
…odefaultlibs (llvm#65912)" This reverts commit 64c0bdd. This seems to run into errors on some buildbots; configure errors out like this: -- Looking for _Unwind_RaiseException in unwind -- Looking for _Unwind_RaiseException in unwind - not found CMake Error at /usr/share/cmake-3.25/Modules/CheckLibraryExists.cmake:71 (try_compile): Only libraries may be used as try_compile or try_run IMPORTED LINK_LIBRARIES. Got unwind of type UTILITY. Call Stack (most recent call first): /b/sanitizer-aarch64-linux-fuzzer/build/llvm-project/compiler-rt/cmake/config-ix.cmake:66 (check_library_exists) /b/sanitizer-aarch64-linux-fuzzer/build/llvm-project/compiler-rt/CMakeLists.txt:281 (include)
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…odefaultlibs If libc++ is available and should be used as the ubsan C++ ABI library, the check for libc++ might fail if libc++ is a static library, as the -nodefaultlibs flag inhibits a potential compiler default -lunwind. Just like the -nodefaultlibs configuration tests for and manually adds a bunch of compiler default libraries, look for -lunwind too. This is a reland of llvm#65912.
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…odefaultlibs (#66584) If libc++ is available and should be used as the ubsan C++ ABI library, the check for libc++ might fail if libc++ is a static library, as the -nodefaultlibs flag inhibits a potential compiler default -lunwind. Just like the -nodefaultlibs configuration tests for and manually adds a bunch of compiler default libraries, look for -lunwind too. This is a reland of #65912.
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If libc++ is available and should be used as the ubsan C++ ABI library, the check for libc++ might fail if libc++ is a static library, as the -nodefaultlibs flag inhibits a potential compiler default -lunwind.
Just like the -nodefaultlibs configuration tests for and manually adds a bunch of compiler default libraries, look for -lunwind too.