------- Comment #2 from jdraper at super dot org 2009-04-28 18:24 ------- (In reply to comment #1) > IIRC at -O0, variable tracking is not enabled so it only produces single > locations. >
This makes sense to me as a possible explanation, but my response would be to turn variable tracking on even at -O0. If gcc were not set up to produce location lists at all, then the compiler would be stuck producing a location description that would be guaranteed to be wrong at some address. But since it has this capability, I think that it should produce correct debugging information at every optimization level, not just for optimized code. Producing information that is wrong unless the debugger does some contortion to adjust the breakpoint just doesn't seem like the right decision. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39703
