On 08/07/2012 12:38 PM, Steven Rostedt wrote:
> From: Steven Rostedt <srost...@redhat.com>
>
> With gcc 4.6.0 the -mfentry feature places the function profiling call at the
> start of the function. When this is used, the call is to __fentry__ and not
> mcount.
>
> Change recordmcount.c to record both callers to __fentry__ and mcount.
[snip]
> - (altmcount && strcmp(altmcount, symname) == 0))
> + (altmcount && strcmp(altmcount, symname) == 0) ||
> + (strcmp(fentry, symname) == 0))
The proposed change will work as long as all the *.o use the same name.
Only one of {"__fentry__", "mcount", "_mcount", altmcount} is allowed
for all the *.o as input for a particular run. [Modulo the hack
of ignoring a leading '.' for 64-bit PowerPC, of course.]
If the user changes compilers (or changes CFLAGS by insert/remove "-mfentry")
without doing a "make clean", then recordmcount will omit some calls.
Those restrictions are easy to guess, and recovery is easy. Therefore,
Ack'ed by: John Reiser <jrei...@bitwagon.com>
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