Export: Process INSTALL_INTERFACE in INCLUDES DESTINATION.

Code such as

 install(TARGETS ...
   INCLUDES DESTINATION $<INSTALL_INTERFACE:include>
 )

should behave as if the INSTALL_INTERFACE wrapper were not present.

Source/cmExportFileGenerator.cxx

@@ -322,7 +322,10 @@ void cmExportFileGenerator::PopulateIncludeDirectoriesInterface(
   cmListFileBacktrace lfbt;
   cmGeneratorExpression ge(lfbt);
 
-  std::string dirs = tei->InterfaceIncludeDirectories;
+  std::string dirs = cmGeneratorExpression::Preprocess(
+                                            tei->InterfaceIncludeDirectories,
+                                            preprocessRule,
+                                            true);
   this->ReplaceInstallPrefix(dirs);
   cmsys::auto_ptr<cmCompiledGeneratorExpression> cge = ge.Parse(dirs);
   std::string exportDirs = cge->Evaluate(target->GetMakefile(), 0,

Tests/ExportImport/Export/CMakeLists.txt

@@ -313,6 +313,20 @@ install(TARGETS testLibRequired
           $<INSTALL_PREFIX>/installIncludesTest2
           installIncludesTest3/$<TARGET_PROPERTY:NAME>
           $<TARGET_PROPERTY:NAME>/installIncludesTest4
+          $<INSTALL_INTERFACE:installIncludesTest5$<0:>>
+          $<INSTALL_INTERFACE:$<0:>installIncludesTest6>
+          $<INSTALL_INTERFACE:$<INSTALL_PREFIX>/installIncludesTest7>
+)
+
+target_include_directories(testLibRequired INTERFACE
+  # These can't be in the above install(INCLUDES DESTINATION call because
+  # that is only for installed interfaces. These directories are prefixes
+  # in the build dir, which is an error for the installed interface.
+  # We add them here so that we don't have to add conditions in the Import
+  # component of the test.
+  $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/installIncludesTest5$<0:>>
+  $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/$<0:>installIncludesTest6>
+  $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/installIncludesTest7>
 )
 install(TARGETS
           testLibIncludeRequired1
@@ -340,6 +354,12 @@ file(MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/installIncludesTest3/testLibReq
 file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/installIncludesTest3/testLibRequired/installIncludesTest3.h" "// No content\n")
 file(MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/testLibRequired/installIncludesTest4")
 file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/testLibRequired/installIncludesTest4/installIncludesTest4.h" "// No content\n")
+file(MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/installIncludesTest5")
+file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/installIncludesTest5/installIncludesTest5.h" "// No content\n")
+file(MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/installIncludesTest6")
+file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/installIncludesTest6/installIncludesTest6.h" "// No content\n")
+file(MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/installIncludesTest7")
+file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/installIncludesTest7/installIncludesTest7.h" "// No content\n")
 install(FILES
   "${CMAKE_CURRENT_BINARY_DIR}/installIncludesTest/installIncludesTest.h"
   DESTINATION installIncludesTest
@@ -356,6 +376,18 @@ install(FILES
   "${CMAKE_CURRENT_BINARY_DIR}/testLibRequired/installIncludesTest4/installIncludesTest4.h"
   DESTINATION testLibRequired/installIncludesTest4
 )
+install(FILES
+  "${CMAKE_CURRENT_BINARY_DIR}/installIncludesTest5/installIncludesTest5.h"
+  DESTINATION installIncludesTest5
+)
+install(FILES
+  "${CMAKE_CURRENT_BINARY_DIR}/installIncludesTest6/installIncludesTest6.h"
+  DESTINATION installIncludesTest6
+)
+install(FILES
+  "${CMAKE_CURRENT_BINARY_DIR}/installIncludesTest7/installIncludesTest7.h"
+  DESTINATION installIncludesTest7
+)
 
 install(TARGETS testLibDepends testSharedLibDepends EXPORT DependsExp DESTINATION lib )
 install(EXPORT DependsExp FILE testLibDependsTargets.cmake DESTINATION lib/cmake/testLibDepends)

Tests/ExportImport/Import/A/deps_iface.c

@@ -8,6 +8,9 @@
 #include "installIncludesTest2.h"
 #include "installIncludesTest3.h"
 #include "installIncludesTest4.h"
+#include "installIncludesTest5.h"
+#include "installIncludesTest6.h"
+#include "installIncludesTest7.h"
 
 #ifndef testLibRequired_IFACE_DEFINE
 #error Expected testLibRequired_IFACE_DEFINE