Explicitly specify library types for *TestLib targets.

Use static libraries for plugins which aren't used as dependencies (as
they don't export any symbols anyway), use shared libraries for plugins
used as dependencies (as they already export the symbols and static
libraries cause linker errors on mingw32).

src/Plugins/MagnumFont/CMakeLists.txt

@@ -44,7 +44,7 @@ target_link_libraries(MagnumFont
 install(FILES ${MagnumFont_HEADERS} DESTINATION ${MAGNUM_PLUGINS_INCLUDE_INSTALL_DIR}/MagnumFont)
 
 if(BUILD_GL_TESTS)
-    add_library(MagnumFontTestLib $<TARGET_OBJECTS:MagnumFontObjects>)
+    add_library(MagnumFontTestLib STATIC $<TARGET_OBJECTS:MagnumFontObjects>)
     target_link_libraries(MagnumFontTestLib
         ${MAGNUM_LIBRARIES}
         ${MAGNUM_TEXT_LIBRARIES}

src/Plugins/MagnumFontConverter/CMakeLists.txt

@@ -44,7 +44,7 @@ target_link_libraries(MagnumFontConverter
 install(FILES ${MagnumFontConverter_HEADERS} DESTINATION ${MAGNUM_PLUGINS_INCLUDE_INSTALL_DIR}/MagnumFontConverter)
 
 if(BUILD_TESTS)
-    add_library(MagnumFontConverterTestLib $<TARGET_OBJECTS:MagnumFontConverterObjects>)
+    add_library(MagnumFontConverterTestLib STATIC $<TARGET_OBJECTS:MagnumFontConverterObjects>)
     target_link_libraries(MagnumFontConverterTestLib
         ${MAGNUM_LIBRARIES}
         ${MAGNUM_TEXT_LIBRARIES})

src/Plugins/TgaImageConverter/CMakeLists.txt

@@ -40,7 +40,7 @@ target_link_libraries(TgaImageConverter ${MAGNUM_LIBRARIES})
 install(FILES ${TgaImageConverter_HEADERS} DESTINATION ${MAGNUM_PLUGINS_INCLUDE_INSTALL_DIR}/TgaImageConverter)
 
 if(BUILD_TESTS)
-    add_library(TgaImageConverterTestLib $<TARGET_OBJECTS:TgaImageConverterObjects>)
+    add_library(TgaImageConverterTestLib SHARED $<TARGET_OBJECTS:TgaImageConverterObjects>)
     target_link_libraries(TgaImageConverterTestLib ${MAGNUM_LIBRARIES})
     add_subdirectory(Test)
 endif()

src/Plugins/TgaImporter/CMakeLists.txt

@@ -41,7 +41,7 @@ target_link_libraries(TgaImporter ${MAGNUM_LIBRARIES})
 install(FILES ${TgaImporter_HEADERS} DESTINATION ${MAGNUM_PLUGINS_INCLUDE_INSTALL_DIR}/TgaImporter)
 
 if(BUILD_TESTS)
-    add_library(TgaImporterTestLib $<TARGET_OBJECTS:TgaImporterObjects>)
+    add_library(TgaImporterTestLib SHARED $<TARGET_OBJECTS:TgaImporterObjects>)
     target_link_libraries(TgaImporterTestLib ${MAGNUM_LIBRARIES})
     add_subdirectory(Test)
 endif()