Use the link information as a source of compile definitions and includes.

After evaluating the INTERFACE_INCLUDE_DIRECTORIES, of a target in a
generator expression, also read the INTERFACE_INCLUDE_DIRECTORIES of
its link interface dependencies.

That means that code such as this will result in the 'user' target
using /bar/include and /foo/include:

 add_library(foo ...)
 target_include_directories(foo INTERFACE /foo/include)
 add_library(bar ...)
 target_include_directories(bar INTERFACE /bar/include)
 target_link_libraries(bar LINK_PUBLIC foo)

 add_executable(user ...)
 target_include_directories(user PRIVATE
    $<TARGET_PROPERTY:bar,INTERFACE_INCLUDE_DIRECTORIES>)

Also process the interface include directories from direct link
dependencies for in-build targets.

The situation is similar for the INTERFACE_COMPILE_DEFINITIONS. The
include directories related code is currently more complex because
we also need to store a backtrace at configure-time for the purpose
of debugging includes. The compile definitions related code will use
the same pattern in the future.

This is not a change in behavior, as existing code has the same effect,
but that existing code will be removed in follow-up commits.

1 files changed, 8 insertions, 0 deletions

diff --git a/Source/cmTargetLinkLibrariesCommand.cxx b/Source/cmTargetLinkLibrariesCommand.cxx
index 9dd0e5b..22ea920 100644
--- a/Source/cmTargetLinkLibrariesCommand.cxx
+++ b/Source/cmTargetLinkLibrariesCommand.cxx
@@ -291,6 +291,14 @@ cmTargetLinkLibrariesCommand::HandleLibrary(const char* lib,
   // Handle normal case first.
   if(this->CurrentProcessingState != ProcessingLinkInterface)
     {
+    {
+    cmListFileBacktrace lfbt;
+    this->Makefile->GetBacktrace(lfbt);
+    cmValueWithOrigin entry(this->Target->GetDebugGeneratorExpressions(lib,
+                                                                       llt),
+                            lfbt);
+    this->Target->AppendTllInclude(entry);
+    }
     this->Makefile
       ->AddLinkLibraryForTarget(this->Target->GetName(), lib, llt);
     if (this->CurrentProcessingState != ProcessingPublicInterface)