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ca48939816
The runtime that shipped with Swift 5.1 and earlier had a bug that interfered with backward deployment of binaries that dynamically check for protocol conformances on conditionally-available tests. This was fixed in the top-of-tree Swift runtime by https://github.com/apple/swift/pull/29887; however, that doesn't do much good for running binaries on older OSes that don't have that fix. In order for binaries built with a newer Swift compiler to run successfully on older OSes, introduce a compatibility hook that replaces the conformance cache implementation in the original OS runtime with a version based on the current implementation that has the fix for the protocol conformance bug. Fixes rdar://problem/59460603
68 lines
2.1 KiB
CMake
68 lines
2.1 KiB
CMake
# Toolchain-only build products
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list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_LIST_DIR}/../cmake/modules)
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include(AddSwiftStdlib)
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set(CXX_COMPILE_FLAGS)
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set(CXX_LINK_FLAGS)
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set(compile_flags
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# Build the runtime with -Wall to catch, e.g., uninitialized variables
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# warnings.
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"-Wall"
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# C++ code in the runtime and standard library should generally avoid
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# introducing static constructors or destructors.
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"-Wglobal-constructors"
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"-Wexit-time-destructors"
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# We don't want runtime C++ code to export symbols we didn't explicitly
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# choose to.
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"-fvisibility=hidden")
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# Build the runtime with -Wall to catch, e.g., uninitialized variables
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# warnings.
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if(SWIFT_COMPILER_IS_MSVC_LIKE)
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list(APPEND compile_flags "/W3")
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else()
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list(APPEND compile_flags "-Wall")
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endif()
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foreach(flag ${compile_flags})
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check_cxx_compiler_flag("${flag}" is_supported)
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if(is_supported)
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list(APPEND CXX_COMPILE_FLAGS "${flag}")
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endif()
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endforeach()
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unset(compile_flags)
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if("Thread" IN_LIST SWIFT_RUNTIME_USE_SANITIZERS)
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list(APPEND CXX_LINK_FLAGS "-fsanitize=thread")
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endif()
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# Do not enforce checks for LLVM's ABI-breaking build settings.
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# The Swift runtime uses some header-only code from LLVM's ADT classes,
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# but we do not want to link libSupport into the runtime. These checks rely
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# on the presence of symbols in libSupport to identify how the code was
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# built and cause link failures for mismatches. Without linking that library,
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# we get link failures regardless, so instead, this just disables the checks.
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if(CMAKE_VERSION VERSION_LESS 3.12)
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append("-DLLVM_DISABLE_ABI_BREAKING_CHECKS_ENFORCING=1" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
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else()
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add_compile_definitions(LLVM_DISABLE_ABI_BREAKING_CHECKS_ENFORCING=1)
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endif()
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# Compatibility libraries build in a special alternate universe that can't
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# directly link to most OS runtime libraries, and have to access the
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# runtime being patched only through public ABI.
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list(APPEND CXX_COMPILE_FLAGS "-DSWIFT_COMPATIBILITY_LIBRARY=1")
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add_subdirectory(legacy_layouts)
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add_subdirectory(Compatibility50)
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add_subdirectory(Compatibility51)
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add_subdirectory(CompatibilityDynamicReplacements)
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