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Re: What is a good profiling tool ? - problem with gprof

On 06/17/2013 12:19 PM, J.B.W.Webber wrote:
Hi, I am trying to find in which function call the most time is being spent.

I am using gcc and trying to compile and link with -g and -pg.
i.e. for a trivial test :

$ cat helloworld.c
/* Hello World program */
     printf("Hello World\n");

$ gcc -g -pg -c helloworld.c
$ gcc -pg helloworld.o
helloworld.o: In function `main':
helloworld.c:6: undefined reference to `_mcount'
collect2: ld returned 1 exit status

Any ideas ? Am I missing a .h call ? Or do I need to link to something ?

I have just updated cygwin. I attach cygcheck.out

Or any suggestions for another profiling tool that actually reports times ?

If the gprof section of binutils is properly built and installed, it should satisfy the mcount reference. It's a bit strange to make a .o with -g -pg together, particularly when you don't link with the same options. FWIW, latest version of Intel VTune works with cygwin builds with -g3 -gdwarf-2 (and of course PATH considerations).

Tim Prince

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