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CMake: Simplify target_link_libraries "object" linking shim

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This uses generator expressions instead, so that it's no longer
dependent on all linked component libraries existing first.
This commit is contained in:
Sam Edwards 2018-10-10 20:14:47 -06:00
parent e89621b88d
commit a0d9a931e0
1 changed files with 28 additions and 23 deletions
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45
cmake/macros/BuildMetalib.cmake
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@ -34,31 +34,35 @@ function(target_link_libraries target)
set(compile_definitions "$<TARGET_PROPERTY:${library},INTERFACE_COMPILE_DEFINITIONS>")
set_property(TARGET "${target}" APPEND PROPERTY COMPILE_DEFINITIONS "${compile_definitions}")
# Libraries are only linked transitively if they aren't components.
# Unfortunately, it seems like INTERFACE_LINK_LIBRARIES can't have
# generator expressions on an object library(?) so we resort to taking
# care of this at configuration time.
if(TARGET "${library}")
get_target_property(target_type "${library}" TYPE)
if(NOT target_type STREQUAL "INTERFACE_LIBRARY")
get_target_property(is_component "${library}" IS_COMPONENT)
# Build up some generator expressions for determining whether `library`
# is a component library or not.
if(library MATCHES ".*::.*")
# "::" messes up CMake's genex parser; fortunately, a library whose
# name contains that is either an interface library or alias, and
# definitely not a component
set(is_component 0)
set(name_of_component "")
set(name_of_non_component "${library}")
else()
set(is_component OFF)
endif()
else()
# This is a safe assumption, since we define all component libraries
# before the metalib they appear in:
set(is_component OFF)
set(is_component "$<TARGET_PROPERTY:${library},IS_COMPONENT>")
# CMake complains if we lookup IS_COMPONENT on an INTERFACE library :(
set(is_object "$<STREQUAL:$<TARGET_PROPERTY:${library},TYPE>,OBJECT_LIBRARY>")
set(is_component "$<BOOL:$<${is_object}:${is_component}>>")
set(name_of_component "$<${is_component}:${library}>")
set(name_of_non_component "$<$<NOT:${is_component}>:${library}>")
endif()
if(is_component)
# Libraries are only linked transitively if they aren't components.
set_property(TARGET "${target}" APPEND PROPERTY
INTERFACE_LINK_LIBRARIES "${name_of_non_component}")
# Also build with the same BUILDING_ macros, because these will all end
# up in the same library.
set(compile_definitions "$<TARGET_PROPERTY:${library},COMPILE_DEFINITIONS>")
set_property(TARGET "${target}" APPEND PROPERTY COMPILE_DEFINITIONS "${compile_definitions}")
else()
set_property(TARGET "${target}" APPEND PROPERTY INTERFACE_LINK_LIBRARIES "${library}")
endif()
set_property(TARGET "${target}" APPEND PROPERTY
COMPILE_DEFINITIONS "$<${is_component}:${compile_definitions}>")
else()
# This is a file path to an out-of-tree library - this needs to be
# recorded so that the metalib can link them. (They aren't needed at
@ -66,7 +70,8 @@ function(target_link_libraries target)
# transitively.)
set_property(TARGET "${target}" APPEND PROPERTY INTERFACE_LINK_LIBRARIES "${library}")
endif()
endforeach()
endforeach(library)
endfunction(target_link_libraries)