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https://gitlab.kitware.com/cmake/cmake.git
synced 2026-09-27 04:09:36 +03:00
Mickaël Germain
0f6e8ded1d
Add an APPLY action to $<LIST:TRANSFORM> that evaluates an arbitrary <body> once per selected element, with $<_0> bound to the element, so a list can be mapped through any generator expression at generate time. Unlike the configure-time list(TRANSFORM ... APPLY <function>) command, the genex form has no side effects and returns the body's value directly, and a list-valued result expands into multiple elements. The body evaluates in its own binding scope, so nested APPLY actions can shadow $<_0>, and context-sensitive state it observes (such as target dependencies) still propagates to the enclosing expression. APPLY accepts the same AT/FOR/REGEX selectors as the canned actions. Issue: #27892
19 lines
819 B
CMake
19 lines
819 B
CMake
enable_language(C)
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# `provider` is EXCLUDE_FROM_ALL, so it builds only when another target declares
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# a build-order dependency on it.
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add_library(provider STATIC ListTransformApplyDependTarget.c)
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set_property(TARGET provider PROPERTY EXCLUDE_FROM_ALL 1)
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# `consumer`'s only reference to `provider` is the $<TARGET_FILE:$<_0>> in the
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# APPLY body. CMake derives the build-order dependency from that reference only
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# if APPLY propagates the target back out (DependTargets). If that regresses,
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# `provider` is never built and the copy below fails for lack of the archive, so
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# a green build of `consumer` alone is the regression guard.
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add_custom_target(consumer
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COMMAND "${CMAKE_COMMAND}" -E copy
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"$<LIST:TRANSFORM,provider,APPLY,$<TARGET_FILE:$<_0>>>"
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"${CMAKE_CURRENT_BINARY_DIR}/copied.out"
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VERBATIM
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)
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