Memory listing from gcc

How about the "size" command? Or you can get detailed listings with objdump. Both of these operate on the compiled object files.

You can get a map from the Linker: is that what you mean by a "usage listing"?

Generally you can't --- because it's not the job of gcc to decide about memory usage. That's done by the linker. Get a map file, and/or run 'size' or 'objdump' on the resulting files.

If you're looking for assembly listings try adding

-Wa,-ahlms=myfile.lst

to the gcc compilation command line.

If you're looking for the big picture after linking, get a linker map by adding

-Wl,-Map=myfile.map,--cref

to the gcc command line performing the final link.

If the module cross-reference produces too much output, use the simpler form

-Wl,-Map=myfile.map

Please do not put any extra spaces in the switches or they will be misunderstood by the toolchain.

HTH