CMake: fix TestSuite to be usable via CMake subprojects.

CMakeLists.txt

@@ -150,12 +150,15 @@ if(CMAKE_CROSSCOMPILING)
     add_executable(Corrade::rc IMPORTED)
     set_property(TARGET Corrade::rc PROPERTY IMPORTED_LOCATION ${CORRADE_RC_EXECUTABLE})
 endif()
+
+# If we're in a CMake subproject, find_package(Corrade) will be looking for
+# these, so supply their in-source location to cache
 if(CORRADE_TESTSUITE_TARGET_XCTEST)
-    set(CORRADE_TESTSUITE_XCTEST_RUNNER ${PROJECT_SOURCE_DIR}/src/Corrade/TestSuite/XCTestRunner.mm.in)
+    set(CORRADE_TESTSUITE_XCTEST_RUNNER ${PROJECT_SOURCE_DIR}/src/Corrade/TestSuite/XCTestRunner.mm.in CACHE INTERNAL "" FORCE)
 elseif(CORRADE_TARGET_ANDROID)
-    set(CORRADE_TESTSUITE_ADB_RUNNER ${PROJECT_SOURCE_DIR}/src/Corrade/TestSuite/AdbRunner.sh)
+    set(CORRADE_TESTSUITE_ADB_RUNNER ${PROJECT_SOURCE_DIR}/src/Corrade/TestSuite/AdbRunner.sh CACHE INTERNAL "" FORCE)
 elseif(CORRADE_TARGET_EMSCRIPTEN)
-    set(CORRADE_TESTSUITE_EMSCRIPTEN_RUNNER ${PROJECT_SOURCE_DIR}/src/Corrade/TestSuite/EmscriptenRunner.html.in)
+    set(CORRADE_TESTSUITE_EMSCRIPTEN_RUNNER ${PROJECT_SOURCE_DIR}/src/Corrade/TestSuite/EmscriptenRunner.html.in CACHE INTERNAL "" FORCE)
 endif()
 
 # Detect and auto-enable compiler compatibility

doc/corrade-changelog.dox

@@ -75,6 +75,8 @@ namespace Corrade {
     upcoming C++2a standard. The equivalent CMake property can now be set to
     @cpp 20 @ce to pass the `-std=c++2a` flag to GCC and Clang and
     `/std:c++latest` to MSVC.
+-   It's now possible to use the @ref TestSuite library via CMake subprojects
+    also on Android, iOS and Emscripten
 
 @subsection corrade-changelog-latest-bugfixes Bug fixes
 

src/CMakeLists.txt

@@ -41,4 +41,4 @@ endif()
 add_subdirectory(Corrade)
 
 # Corrade include dir for superprojects
-set(CORRADE_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR} CACHE INTERNAL "")
+set(CORRADE_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR} CACHE INTERNAL "" FORCE)