You are talking about gcc options, see gcc manual (and perhaps as/gas manual for the assembler options, see -Wa,-a below)
-S outputs asm only (i.e. won't assemble into object)
-save-temps outputs intermediate files
-Wa,-adlns=somefile.lst outputs assembler's listing (-a is the main flag, "dlns" are just modifiers detemining what goes into the listing)
JW
