0b0c70d1bf
The SwiftMixLib test was failing on Windows due to a missing link against swiftCore. On macOS and Linux, there are mechanisms for extracting the libraries that the object depends on and passing that to the linker so that the library dependencies don't need to be listed explicitly. The Windows Swift toolchain does not have this mechanism. In the future, it would likely make sense for CMake to pass some of the implicitly required libraries for linking Swift via `CMAKE_Swift_IMPLICIT_LINK_LIBRARIES`. Unlike the normal mechanisms though, these libraries would need to be passed even when the link language is Swift. For now though, we should get the test up and running again. Fixes: #25573
25 lines
1.0 KiB
CMake
25 lines
1.0 KiB
CMake
cmake_minimum_required(VERSION 3.24)
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project(SwiftMixLib C CXX Swift)
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# Swift on Windows only provides a release runtime.
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set(CMAKE_MSVC_RUNTIME_LIBRARY MultiThreadedDLL)
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add_library(SwiftMixedLib lib.c lib.cpp lib.swift)
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add_executable(Swifty main.swift)
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target_link_libraries(Swifty PUBLIC SwiftMixedLib)
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add_executable(c_main main.c)
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target_link_libraries(c_main PUBLIC SwiftMixedLib)
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if(WIN32)
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# TODO: On macOS and Linux, Swift has mechanism for determining what libraries
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# an object, or objects from a static archive, need to link against,
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# which is how the Swift driver is able to determine that `c_main`
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# needs to link swiftCore. Windows does not have this mechanism.
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# Eventually CMake should learn how to do this, explicitly forwarding
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# the required library to the link command when linking a static
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# archive containing Swift sources into something else, even if the
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# linker language is Swift.
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target_link_libraries(c_main PRIVATE swiftCore)
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endif()
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