To make it easier to build the tests with debug symbols, add a check for the "GDB_DEBUG" environment variable. If set, build with -g and -Og to enable the symbols and disable optimization. Signed-off-by: Martin Roth <gaumless@gmail.com> Change-Id: I3a644dcccb7e15473413b775da8f70617afaefce Reviewed-on: https://review.coreboot.org/c/coreboot/+/67918 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Jakub Czapiga <jacz@semihalf.com>