CMake: last piece missing for CMake subproject support in Emscripten.

CMakeLists.txt

@@ -300,6 +300,14 @@ else()
     set(SHARED_OR_STATIC STATIC)
 endif()
 
+# If we're in a CMake subproject, find_package(Magnum) will be looking for
+# these when targeting Emscripten, so supply their in-source location
+if(CORRADE_TARGET_EMSCRIPTEN AND NOT PROJECT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
+    set(MAGNUM_EMSCRIPTENAPPLICATION_JS ${PROJECT_SOURCE_DIR}/src/Magnum/Platform/EmscriptenApplication.js CACHE INTERNAL "" FORCE)
+    set(MAGNUM_WINDOWLESSEMSCRIPTENAPPLICATION_JS ${PROJECT_SOURCE_DIR}/src/Magnum/Platform/WindowlessEmscriptenApplication.js CACHE INTERNAL "" FORCE)
+    set(MAGNUM_WEBAPPLICATION_CSS ${PROJECT_SOURCE_DIR}/src/Magnum/Platform/WebApplication.css CACHE INTERNAL "" FORCE)
+endif()
+
 # Installation paths
 include(${CORRADE_LIB_SUFFIX_MODULE})
 set(MAGNUM_BINARY_INSTALL_DIR bin)

doc/changelog.dox

@@ -181,6 +181,8 @@ See also:
     flag in particular) is now handled by the `FindOpenGLES3.cmake` module
     and the new `INTERFACE_LINK_OPTIONS` property instead of `FindMagnum.cmake`. On older versions this is handled in `FindMagnum.cmake` by modifying the
     global `CMAKE_EXE_LINKER_FLAGS` variable.
+-   It's now possible to use Magnum as a CMake subproject also when building
+    for Emscripten (see [mosra/magnum#219](https://github.com/mosra/magnum/issues/219))
 
 @subsection changelog-latest-bugfixes Bug fixes
 

src/CMakeLists.txt

@@ -58,4 +58,4 @@ add_subdirectory(Magnum)
 add_subdirectory(MagnumPlugins)
 
 # Magnum include dir for superprojects
-set(MAGNUM_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR} CACHE INTERNAL "")
+set(MAGNUM_INCLUDE_DIR ${CMAKE_CURRENT_SOURCE_DIR} CACHE INTERNAL "" FORCE)