Enable precompiled libraries

Arduino_package/hardware/platform.txt

@@ -49,6 +49,7 @@ compiler.objcopy.eep.flags=-O ihex -j .eeprom --set-section-flags=.eeprom=alloc,
 compiler.elf2hex.flags=-O binary
 compiler.elf2hex.cmd=arm-none-eabi-objcopy
 compiler.ldflags=
+compiler.libraries.ldflags=
 compiler.size.cmd=arm-none-eabi-size
 compiler.define=-DARDUINO=
 
@@ -100,7 +101,7 @@ recipe.cpp.o.pattern="{compiler.path}{compiler.cpp.cmd}" {compiler.cpp.flags} -m
 recipe.ar.pattern="{compiler.path}{compiler.ar.cmd}" {compiler.ar.flags} {compiler.ar.extra_flags} "{archive_file_path}" "{object_file}"
 
 ## Combine gc-sections, archives, and objects
-recipe.c.combine.pattern="{compiler.path}{compiler.c.elf.cmd}" "-L{runtime.tools.ameba_d_asdk_toolchain.path}/lib/" "-L{build.variant.path}/linker_scripts/gcc" "-T{build.variant.path}/{build.ldscript}" {compiler.c.elf.flags} "-Wl,-Map={build.path}/application.map" {compiler.c.elf.extra_flags} -o "{build.path}/application.axf" -Wl,--start-group {object_files} -Wl,--end-group -Wl,--start-group -Wl,--whole-archive "{build.path}/{archive_file}" -Wl,--no-whole-archive {compiler.ameba.ar.list} -Wl,--end-group -lm -lstdc++
+recipe.c.combine.pattern="{compiler.path}{compiler.c.elf.cmd}" "-L{runtime.tools.ameba_d_asdk_toolchain.path}/lib/" "-L{build.variant.path}/linker_scripts/gcc" "-T{build.variant.path}/{build.ldscript}" {compiler.c.elf.flags} "-Wl,-Map={build.path}/application.map" {compiler.c.elf.extra_flags} -o "{build.path}/application.axf" -Wl,--start-group {object_files} {compiler.libraries.ldflags} -Wl,--end-group -Wl,--start-group -Wl,--whole-archive "{build.path}/{archive_file}" -Wl,--no-whole-archive {compiler.ameba.ar.list} -Wl,--end-group -lm -lstdc++
 
 ## Create nm map
 recipe.nm.pattern=cp "{build.path}/{build.project_name}.axf" "{build.path}/application.axf"