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If Clang is set up to link directly against libunwind (via the --unwindlib option, or the corresponding builtin default option), configuring libunwind will fail while bootstrapping (before the initial libunwind is built), because every cmake test will fail due to -lunwind not being found, and linking the shared library will fail similarly. Check if --unwindlib=none is supported, and add it in that case. Using check_c_compiler_flag on its own doesn't work, because that only adds the tested flag to the compilation command, and if -lunwind is missing, the linking step would still fail - instead try adding it to CMAKE_REQUIRED_FLAGS and restore the variable if it doesn't work. This avoids having to pass --unwindlib=none while building libunwind. Differential Revision: https://reviews.llvm.org/D112126
12 lines
552 B
CMake
12 lines
552 B
CMake
macro(llvm_enable_language_nolink)
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# Set CMAKE_TRY_COMPILE_TARGET_TYPE to STATIC_LIBRARY to disable linking
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# in the compiler sanity checks. When bootstrapping the toolchain,
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# the toolchain itself is still incomplete and sanity checks that include
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# linking may fail.
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set(__SAVED_TRY_COMPILE_TARGET_TYPE ${CMAKE_TRY_COMPILE_TARGET_TYPE})
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set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
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enable_language(${ARGV})
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set(CMAKE_TRY_COMPILE_TARGET_TYPE ${__SAVED_TRY_COMPILE_TARGET_TYPE})
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unset(__SAVED_TRY_COMPILE_TARGET_TYPE)
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endmacro()
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