On Tue, Feb 03, 2009 at 11:32:18AM -0500, Steven Rostedt wrote: > > On Tue, 2009-02-03 at 19:19 +0300, Anton Vorontsov wrote: > > On Tue, Feb 03, 2009 at 05:06:45PM +0100, Ingo Molnar wrote: > > > [1] Btw, why exactly do we need the -fno-omit-frame-pointer for > > "FUNCTION_TRCER" tracer? Why just -pg isn't sufficient?.. > > > > The problem is this that is in the toplevel Makefile: > > > ifdef CONFIG_FRAME_POINTER > KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls > else > KBUILD_CFLAGS += -fomit-frame-pointer > endif > > > -pg is incompatible with -fomit-frame-pointer
Ah... $ gcc -pg -fomit-frame-pointer -S c.c gcc: -pg and -fomit-frame-pointer are incompatible It's hard-coded in gcc, in the code that don't know about architecture details. But on PowerPC -O1 implies -fomit-frame-pointer, that is gcc -pg -O1 -fno-omit-frame-pointer and gcc -pg -O1 produce different outputs. Thus -pg -O should be the same as "-pg -O -fomit-framepointer". -- Anton Vorontsov email: cbouatmai...@gmail.com irc://irc.freenode.net/bd2 _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
