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This property should come from the content of the property itself,
plus the INTERFACE_INCLUDE_DIRECTORIES of the link *implementation*.

In contrast, when the INTERFACE_INCLUDE_DIRECTORIES is evaluated for
a target, the INTERFACE_INCLUDE_DIRECTORIES of the link *interface*
is used.

Similar logic applies for the COMPILE_DEFINITIONS target properties.

If the propertyName is already an INTERFACE_ variant of the property,
ie, the expression is similar to

 $<TARGET_PROPERTY:foo,INTERFACE_INCLUDE_DIRECTORIES>

then the INTERFACE_INCLUDE_DIRECTORIES of the link *interface* of foo
is used.

However, if the propertyName is not an INTERFACE_ variant, and the
interfacePropertyName is, ie, the expression is similar to:

 $<TARGET_PROPERTY:foo,INCLUDE_DIRECTORIES>

then the INTERFACE_INCLUDE_DIRECTORIES of the link *implementation*
of foo is used.

This will be used to process transitive components of properties
which depend on linked targets. Currently only the link interface
of the target can be used as the source of the linked targets, but
in the next commit it will be possible to use the link implementation
as the source of link targets.

This commit does not change the semantics of the code.

Brad King authored May 06, 2013 and Kitware Robot committed May 06, 2013

2618e025 target_link_libraries: Update usage requirements documentation

Brad King authored May 06, 2013 and Kitware Robot committed May 06, 2013

dea1df4e Memoize usage requirement include directories in a config-specific map
26dba6a1 Fix include dir propagation from conditionally linked targets
b8259c3d Centralize maintenance of usage requirement include directories

Stephen Kelly authored May 02, 2013 and Brad King committed May 06, 2013

Commit 42ebb188 (Memoize includes and defines from interface libraries.,
2013-02-22) introduced caching of the includes.  Fix the memoization to
be configuration-specific so that we do not accumulate entries across
multiple evaluations in a multi-config generator.

Stephen Kelly authored Apr 29, 2013 and Brad King committed May 06, 2013

Generator expressions, including configuration-specific expressions may
be used as link libraries of targets.  The old-style keywords of
target_link_libraries are handled in terms of new generator expressions.
However, the generator expressions expect target names to be valid
against a regular expression, whereas target_link_libraries does not
require validation.  In generator expression constructed without any
action from the user we need to ensure that only valid expressions are
generated.  Ensure that strings which are not valid target names are not
used in generator expressions which validate the argument.

Code like

 target_link_libraries(B debug A)

generates usage requirement references such as "$<$<CONFIG:DEBUG>:A>".
When cmTarget::GetIncludeDirectories uses such references it generates
expressions like:

 $<TARGET_PROPERTY:$<$<CONFIG:DEBUG>:A>,INTERFACE_INCLUDE_DIRECTORIES>

When the conditions are false such references evaluate as an empty
string and the expression fails with an error such as:

 $<TARGET_PROPERTY:tgt,prop> expression requires a non-empty target name.

Fix this by teaching cmTarget::GetIncludeDirectories to wrap the above
expression inside a conditional:

 $<$<BOOL:$<$<CONFIG:DEBUG>:A>>:...>

so that $<TARGET_PROPERTY:...> will not be evaluated with an empty
target.

Stephen Kelly authored Apr 29, 2013 and Brad King committed May 06, 2013

Maintain a target's internal list of usage requirement include
directories whenever the LINK_LIBRARIES property is set by either
target_link_libraries or set_property.

Re-word the documentation to make clear that CMake integrates usage
requirements during generation and not synchronously during
configuration or execution of target_link_libraries.

Brad King authored Apr 17, 2013 and Kitware Robot committed Apr 17, 2013

df71f968 get_filename_component: Document path components more clearly (#14091)

Brad King authored Apr 17, 2013 and Kitware Robot committed Apr 17, 2013

ce441fac try_compile: add missing fclose() to recently added error case

Brad King authored Apr 17, 2013 and Kitware Robot committed Apr 17, 2013

5a5e0fa9 Fix clearing of the INCLUDE_DIRECTORIES DIRECTORY property.