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https://gitlab.kitware.com/cmake/cmake.git
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Robert Maynard
3f811dc56f
`LINK_LIBRARIES` entries guarded by `$<COMPILE_ONLY:...>` are not linked, but must participate in target ordering so files generated by compile-only dependencies, like headers, are available before compilation. Fixes: #27792
22 lines
1020 B
CMake
22 lines
1020 B
CMake
enable_language(C)
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# A custom command produces a header that does not exist at configure time.
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add_custom_command(
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OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/generated.h"
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COMMAND "${CMAKE_COMMAND}" -E touch "${CMAKE_CURRENT_BINARY_DIR}/generated.h"
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)
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# An INTERFACE library generates the header.
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add_library(header_provider INTERFACE ${CMAKE_CURRENT_BINARY_DIR}/generated.h)
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target_include_directories(header_provider INTERFACE "${CMAKE_CURRENT_BINARY_DIR}")
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# Not in ALL so it is only built when something depends on it.
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set_property(TARGET header_provider PROPERTY EXCLUDE_FROM_ALL 1)
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# A consumer uses $<COMPILE_ONLY:header_provider> so it gets the include
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# path but does not link against header_provider. The build-order
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# dependency on header_provider must be propagated through the
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# COMPILE_ONLY expression so that generated.h exists when consumer.c
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# is compiled.
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add_library(consumer SHARED COMPILE_ONLY-custom-target-deps-consumer.c)
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target_link_libraries(consumer PRIVATE "$<COMPILE_ONLY:header_provider>")
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