% scons -Q debug=0 [?1034hcc -o prog.o -c prog.c cc -o prog prog.o % scons -Q debug=0 [?1034hscons: `.' is up to date. % scons -Q debug=1 [?1034hcc -o prog.o -c -g prog.c cc -o prog prog.o % scons -Q debug=1 [?1034hscons: `.' is up to date.