gprof: gmon.out file is missing call-graph data (I'm using -pg)

gprof: gmon.out file is missing call-graph data (I'm using -pg)

[Zohar Levi]

I have this problem with gprof: 
 
 test.c: 
 ------- 
 
 #include <stdio.h> 
 
 int main() 
 { 
 printf("hello world\n"); 
 
 return 0; 
 }; 
 
 
 
 makefile: 
 ----------- 
 test: test.c 
gcc -g -c test.c -pg 
gcc -o test test.o -pg 
 
 
 when I run test it generates the gmon.out, but gprof
complains: 
 
 gprof: gmon.out file is missing call-graph data 
 
Is there another maintained profiler? 
 
 Thanks


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Re: gprof: gmon.out file is missing call-graph data (I'm using -pg)

[Brian Dessent]

Zohar Levi wrote:

>  when I run test it generates the gmon.out, but gprof
> complains:
> 
>  gprof: gmon.out file is missing call-graph data

It's complaining because there is no call-graph info because your
trivial testcase only has a single function.  If you run it on a
non-trivial testcase, or if you ask for a flat profile (-p) it will work
fine.

The following thread explains the problem and includes a patch which
changes the default behavior in this situation to -p.  Note that gprof
is part of binutils and not part of gcc and questions about it are
better suited for the binutils list.

http://sourceware.org/ml/binutils/2006-04/msg00421.html

Brian