CRT files will now only be reassembled when necessary

CMakeLists.txt

@@ -45,9 +45,18 @@ file(GLOB photon_libc_crt
     ${CMAKE_CURRENT_SOURCE_DIR}/photon/libc/sys/${platform}/machine/${machine}/crt*.s)
 message(STATUS "CRT files: ${photon_libc_crt}")
 
+foreach (crt_file ${photon_libc_crt})
+    get_filename_component(crt_name ${crt_file} NAME_WE)
+    set(crt_path ${CMAKE_CURRENT_BINARY_DIR}/${crt_name}.o)
+    set(crt_bin ${crt_bin} ${crt_path})
+    add_custom_command(
+        OUTPUT ${crt_path}
+        COMMAND ${CMAKE_C_COMPILER} -c -ffreestanding ${crt_file}
+        COMMENT "Assembling ${crt_bin}")
+endforeach ()
+
 add_custom_target(crt ALL
-    DEPENDS ${photon_libc_crt}
-    COMMAND ${CMAKE_C_COMPILER} -c -ffreestanding ${photon_libc_crt}
+    DEPENDS ${crt_bin}
     COMMENT "Generating CRT files")
 
 file(GLOB platform_sources