cmake: build examples as shared library on Android

These examples won't be useful without accompanying Java classes
or Android manifest, but they will at least successfully link.

Author: madebr

CMakeLists.txt

@@ -545,10 +545,29 @@ if(SDLTTF_INSTALL)
 endif()
 
 if(SDLTTF_SAMPLES)
-    add_executable(glfont examples/glfont.c)
-    add_executable(showfont examples/showfont.c examples/editbox.c)
-    add_executable(testapp examples/testapp.c)
-    add_executable(testgputext examples/testgputext.c)
+    function(add_sdl_ttf_example_executable TARGET)
+        if(ANDROID)
+            add_library(${TARGET} SHARED ${ARGN})
+        else()
+            add_executable(${TARGET} ${ARGN})
+        endif()
+        sdl_add_warning_options(${TARGET} WARNING_AS_ERROR ${SDLTTF_WERROR})
+        target_link_libraries(${TARGET} PRIVATE SDL3_ttf::${sdl3_ttf_target_name})
+        target_link_libraries(${TARGET} PRIVATE ${sdl3_target_name})
+        if("c_std_99" IN_LIST CMAKE_C_COMPILE_FEATURES)
+            target_compile_features(${TARGET} PRIVATE c_std_99)
+        endif()
+
+        if(SDLTTF_SAMPLES_INSTALL)
+            install(TARGETS ${TARGET}
+                RUNTIME DESTINATION "${CMAKE_INSTALL_LIBEXECDIR}/installed-tests/SDL3_ttf"
+            )
+        endif()
+    endfunction()
+    add_sdl_ttf_example_executable(glfont examples/glfont.c)
+    add_sdl_ttf_example_executable(showfont examples/showfont.c examples/editbox.c)
+    add_sdl_ttf_example_executable(testapp examples/testapp.c)
+    add_sdl_ttf_example_executable(testgputext examples/testgputext.c)
 
     set(OpenGL_GL_PREFERENCE GLVND)
     find_package(OpenGL)
@@ -559,21 +578,6 @@ if(SDLTTF_SAMPLES)
         target_compile_definitions(glfont PRIVATE HAVE_OPENGL)
         target_link_libraries(glfont PRIVATE OpenGL::GL)
     endif()
-
-    foreach(prog glfont showfont testapp testgputext)
-        sdl_add_warning_options(${prog} WARNING_AS_ERROR ${SDLTTF_WERROR})
-        target_link_libraries(${prog} PRIVATE SDL3_ttf::${sdl3_ttf_target_name})
-        target_link_libraries(${prog} PRIVATE ${sdl3_target_name})
-        if("c_std_99" IN_LIST CMAKE_C_COMPILE_FEATURES)
-          target_compile_features(${prog} PRIVATE c_std_99)
-        endif()
-
-        if(SDLTTF_SAMPLES_INSTALL)
-            install(TARGETS ${prog}
-                RUNTIME DESTINATION "${CMAKE_INSTALL_LIBEXECDIR}/installed-tests/SDL3_ttf"
-            )
-        endif()
-    endforeach()
 endif()
 
 set(available_deps)