Export: Test existing behavior of exporting includes with genexes.

Test that no warning or error diagnostic is issued for 'good code'.

Tests/RunCMake/include_directories/CMakeLists.txt

@@ -1,3 +1,3 @@
 cmake_minimum_required(VERSION 2.8.4)
-project(${RunCMake_TEST} NONE)
+project(${RunCMake_TEST} CXX)
 include(${RunCMake_TEST}.cmake)

Tests/RunCMake/include_directories/RunCMakeTest.cmake

@@ -11,3 +11,4 @@ run_cmake(RelativePathInGenex)
 run_cmake(CMP0021)
 run_cmake(install_config)
 run_cmake(incomplete-genex)
+run_cmake(export-NOWARN)

Tests/RunCMake/include_directories/export-NOWARN-result.txt

@@ -0,0 +1 @@
+0

Tests/RunCMake/include_directories/export-NOWARN-stderr.txt

@@ -0,0 +1 @@
+^$

Tests/RunCMake/include_directories/export-NOWARN.cmake

@@ -0,0 +1,50 @@
+
+add_library(foo empty.cpp)
+set_property(TARGET foo APPEND PROPERTY INTERFACE_INCLUDE_DIRECTORIES $<0:>/include/subdir)
+set_property(TARGET foo APPEND PROPERTY INTERFACE_INCLUDE_DIRECTORIES $<INSTALL_PREFIX>/include/subdir)
+
+set_property(TARGET foo APPEND PROPERTY INTERFACE_INCLUDE_DIRECTORIES $<INSTALL_INTERFACE:$<INSTALL_PREFIX>/include/subdir>)
+set_property(TARGET foo APPEND PROPERTY INTERFACE_INCLUDE_DIRECTORIES $<INSTALL_INTERFACE:include/subdir>)
+set_property(TARGET foo APPEND PROPERTY INTERFACE_INCLUDE_DIRECTORIES $<INSTALL_INTERFACE:include/$<0:>>)
+set_property(TARGET foo APPEND PROPERTY INTERFACE_INCLUDE_DIRECTORIES $<INSTALL_INTERFACE:$<0:>/include>)
+
+# target_include_directories(foo INTERFACE include/subdir) # Does and should warn. INSTALL_INTERFACE must not list src dir paths.
+target_include_directories(foo INTERFACE $<0:>/include/subdir) # Does not and should not should warn, because it starts with a genex.
+target_include_directories(foo INTERFACE $<INSTALL_PREFIX>/include/subdir)
+
+target_include_directories(foo INTERFACE $<INSTALL_INTERFACE:include/subdir>)
+target_include_directories(foo INTERFACE $<INSTALL_INTERFACE:include/$<0:>>)
+
+install(TARGETS foo EXPORT FooTargets DESTINATION lib)
+install(EXPORT FooTargets DESTINATION lib/cmake)
+
+install(TARGETS foo EXPORT FooTargets2
+  DESTINATION lib
+  INCLUDES DESTINATION include # No warning. Implicit install prefix.
+)
+install(EXPORT FooTargets2 DESTINATION lib/cmake)
+
+install(TARGETS foo EXPORT FooTargets3
+  DESTINATION lib
+  INCLUDES DESTINATION $<INSTALL_PREFIX>include
+)
+install(EXPORT FooTargets3 DESTINATION lib/cmake)
+
+install(TARGETS foo EXPORT FooTargets4
+  DESTINATION lib
+  INCLUDES DESTINATION $<INSTALL_INTERFACE:include>
+)
+install(EXPORT FooTargets4 DESTINATION lib/cmake)
+
+install(TARGETS foo EXPORT FooTargets5
+  DESTINATION lib
+    # The $<0:> is evaluated at export time, leaving 'include' behind, which should be treated as above.
+  INCLUDES DESTINATION $<INSTALL_INTERFACE:$<0:>include>
+)
+install(EXPORT FooTargets5 DESTINATION lib/cmake)
+
+install(TARGETS foo EXPORT FooTargets6
+  DESTINATION lib
+  INCLUDES DESTINATION $<INSTALL_INTERFACE:include$<0:>>
+)
+install(EXPORT FooTargets6 DESTINATION lib/cmake)