> * Make -fomit-frame-pointer the default - various targets already do this at > higher optimization levels, but this could easily be done for all targets. > Frame pointers haven't been needed for debugging for decades, however if > there > are still good reasons to keep it enabled with -O0 or -O1 (I can't think of > any > unless it is for last-resort backtrace when there is no unwind info at a > crash), > we could just disable the frame pointer from -O2 onwards.
Given there's an -Og now, maybe frame pointers could be enabled fo -O0 and -Og, off by default otherwise. I like to use -O1 to kick-in the analysis engine and start catching warnings. It seems like -O1 should be closer -O2/-O3, with respect to frame pointers since it could help find issues and tickle problems with hand crafted ASM. Jeff
