cmTarget: Enable convenient include dir handling for INTERFACE_LIBRARY.

Make the CMAKE_INCLUDE_CURRENT_DIR_IN_INTERFACE variable affect
INTERFACE_LIBRARY targets.

Source/cmGlobalGenerator.cxx

@@ -1337,13 +1337,13 @@ void cmGlobalGenerator::FinalizeTargetCompileInfo()
       {
       cmTarget* t = &ti->second;
 
+      t->AppendBuildInterfaceIncludes();
+
       if (t->GetType() == cmTarget::INTERFACE_LIBRARY)
         {
         continue;
         }
 
-      t->AppendBuildInterfaceIncludes();
-
       for (std::vector<cmValueWithOrigin>::const_iterator it
                                       = noconfig_compile_definitions.begin();
           it != noconfig_compile_definitions.end(); ++it)

Source/cmTarget.cxx

@@ -1606,6 +1606,7 @@ void cmTarget::AppendBuildInterfaceIncludes()
   if(this->GetType() != cmTarget::SHARED_LIBRARY &&
      this->GetType() != cmTarget::STATIC_LIBRARY &&
      this->GetType() != cmTarget::MODULE_LIBRARY &&
+     this->GetType() != cmTarget::INTERFACE_LIBRARY &&
      !this->IsExecutableWithExports())
     {
     return;

Tests/InterfaceLibrary/CMakeLists.txt

@@ -6,8 +6,10 @@ project(InterfaceLibrary)
 add_library(iface_nodepends INTERFACE)
 target_compile_definitions(iface_nodepends INTERFACE IFACE_DEFINE)
 
+add_subdirectory(headerdir)
+
 add_executable(InterfaceLibrary definetestexe.cpp)
-target_link_libraries(InterfaceLibrary iface_nodepends)
+target_link_libraries(InterfaceLibrary iface_nodepends headeriface)
 
 add_subdirectory(libsdir)
 

Tests/InterfaceLibrary/definetestexe.cpp

@@ -3,6 +3,18 @@
 #error Expected IFACE_DEFINE
 #endif
 
+#include "iface_header.h"
+
+#ifndef IFACE_HEADER_SRCDIR
+#error Expected IFACE_HEADER_SRCDIR
+#endif
+
+#include "iface_header_builddir.h"
+
+#ifndef IFACE_HEADER_BUILDDIR
+#error Expected IFACE_HEADER_BUILDDIR
+#endif
+
 int main(int,char**)
 {
   return 0;

Tests/InterfaceLibrary/headerdir/CMakeLists.txt

+
+set(CMAKE_INCLUDE_CURRENT_DIR_IN_INTERFACE ON)
+
+add_library(headeriface INTERFACE)
+
+file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/iface_header_builddir.h"
+  "#define IFACE_HEADER_BUILDDIR\n"
+)

Tests/InterfaceLibrary/headerdir/iface_header.h

+#define IFACE_HEADER_SRCDIR