plugins: these checks are done in the top-level CMakeLists.txt already.

Moreover, doing them here would mean the options might get ignored with
no clear reason why. Aaand yes of course this caused MagnumFontConverter
to be skipped for no clear reason on embedded platforms, and uncovered a
setup bug in the test.

src/MagnumPlugins/CMakeLists.txt

@@ -34,7 +34,7 @@ macro(add_plugin plugin_name debug_install_dirs release_install_dirs metadata_fi
     endif()
 endmacro()
 
-if(WITH_AUDIO AND WITH_ANYAUDIOIMPORTER)
+if(WITH_ANYAUDIOIMPORTER)
     add_subdirectory(AnyAudioImporter)
 endif()
 
@@ -50,11 +50,11 @@ if(WITH_ANYSCENEIMPORTER)
     add_subdirectory(AnySceneImporter)
 endif()
 
-if(WITH_TEXT AND WITH_MAGNUMFONT)
+if(WITH_MAGNUMFONT)
     add_subdirectory(MagnumFont)
 endif()
 
-if(WITH_TEXT AND WITH_MAGNUMFONTCONVERTER AND NOT MAGNUM_TARGET_GLES)
+if(WITH_MAGNUMFONTCONVERTER)
     add_subdirectory(MagnumFontConverter)
 endif()
 
@@ -70,6 +70,6 @@ if(WITH_TGAIMPORTER)
     add_subdirectory(TgaImporter)
 endif()
 
-if(WITH_AUDIO AND WITH_WAVAUDIOIMPORTER)
+if(WITH_WAVAUDIOIMPORTER)
     add_subdirectory(WavAudioImporter)
 endif()

src/MagnumPlugins/MagnumFontConverter/Test/CMakeLists.txt

@@ -23,6 +23,14 @@
 #   DEALINGS IN THE SOFTWARE.
 #
 
+if(CORRADE_TARGET_EMSCRIPTEN OR CORRADE_TARGET_ANDROID)
+    set(MAGNUMFONTCONVERTER_TEST_WRITE_DIR "write")
+    set(MAGNUMFONT_TEST_DIR ".")
+else()
+    set(MAGNUMFONTCONVERTER_TEST_WRITE_DIR ${CMAKE_CURRENT_BINARY_DIR})
+    set(MAGNUMFONT_TEST_DIR ${PROJECT_SOURCE_DIR}/src/MagnumPlugins/MagnumFont/Test)
+endif()
+
 # CMake before 3.8 has broken $<TARGET_FILE*> expressions for iOS (see
 # https://gitlab.kitware.com/cmake/cmake/merge_requests/404) and since Corrade
 # doesn't support dynamic plugins on iOS, this sorta works around that. Should
@@ -42,7 +50,10 @@ file(GENERATE OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/$<CONFIG>/configure.h
     INPUT ${CMAKE_CURRENT_BINARY_DIR}/configure.h.in)
 
 corrade_add_test(MagnumFontConverterTest MagnumFontConverterTest.cpp
-    LIBRARIES MagnumText MagnumTrade)
+    LIBRARIES MagnumText MagnumTrade
+    FILES
+        ../../MagnumFont/Test/font.conf
+        ../../MagnumFont/Test/font.tga)
 target_include_directories(MagnumFontConverterTest PRIVATE ${CMAKE_CURRENT_BINARY_DIR}/$<CONFIG>)
 if(BUILD_PLUGINS_STATIC)
     target_link_libraries(MagnumFontConverterTest PRIVATE

src/MagnumPlugins/MagnumFontConverter/Test/MagnumFontConverterTest.cpp

@@ -69,6 +69,9 @@ MagnumFontConverterTest::MagnumFontConverterTest() {
     #ifdef TGAIMPORTER_PLUGIN_FILENAME
     CORRADE_INTERNAL_ASSERT(_importerManager.load(TGAIMPORTER_PLUGIN_FILENAME) & PluginManager::LoadState::Loaded);
     #endif
+
+    /* Create the output directory if it doesn't exist yet */
+    CORRADE_INTERNAL_ASSERT(Utility::Directory::mkpath(MAGNUMFONTCONVERTER_TEST_WRITE_DIR));
 }
 
 void MagnumFontConverterTest::exportFont() {
@@ -129,7 +132,7 @@ void MagnumFontConverterTest::exportFont() {
 
     /* Convert the file */
     Containers::Pointer<AbstractFontConverter> converter = _fontConverterManager.instantiate("MagnumFontConverter");
-    converter->exportFontToFile(font, cache, Utility::Directory::join(MAGNUMFONTCONVERTER_TEST_WRITE_DIR, "font"), "Wave");
+    CORRADE_VERIFY(converter->exportFontToFile(font, cache, Utility::Directory::join(MAGNUMFONTCONVERTER_TEST_WRITE_DIR, "font"), "Wave"));
 
     /* Verify font parameters */
     CORRADE_COMPARE_AS(Utility::Directory::join(MAGNUMFONTCONVERTER_TEST_WRITE_DIR, "font.conf"),

src/MagnumPlugins/MagnumFontConverter/Test/configure.h.cmake

@@ -26,5 +26,5 @@
 #cmakedefine MAGNUMFONTCONVERTER_PLUGIN_FILENAME "${MAGNUMFONTCONVERTER_PLUGIN_FILENAME}"
 #cmakedefine TGAIMAGECONVERTER_PLUGIN_FILENAME "${TGAIMAGECONVERTER_PLUGIN_FILENAME}"
 #cmakedefine TGAIMPORTER_PLUGIN_FILENAME "${TGAIMPORTER_PLUGIN_FILENAME}"
-#define MAGNUMFONTCONVERTER_TEST_WRITE_DIR "${CMAKE_CURRENT_BINARY_DIR}"
+#define MAGNUMFONTCONVERTER_TEST_WRITE_DIR "${MAGNUMFONTCONVERTER_TEST_WRITE_DIR}"
-#define MAGNUMFONT_TEST_DIR "${PROJECT_SOURCE_DIR}/src/MagnumPlugins/MagnumFont/Test"
+#define MAGNUMFONT_TEST_DIR "${MAGNUMFONT_TEST_DIR}"