Building with debug symbols

I am trying to build with debugging symbols. I was able to build with gdbudp included. But I am missing something when attempting to build with debug symbols . I tried setting EXTRA_CFLAGS to -g and CFLAGS to -g but when open the the image with gdb I get the message

Reading symbols from bin-x86_64-efi/snp--intelx.efi.tmp...(no debugging symbols found)...done.

Any pointers on how to enable "-g" during compile.