line-by-line profiling

[Jan Hubicka]

> How do I get line-by-line profiling to work?  I'm using gcc-3.2 linux
> binutils-2.13.90.0.2-2.
> 
> The instructions in gprof say to turn on basic block profiling using
> gcc -a.  Apparantly this flag is obsolete?  I'm guessing it should be
> -fprofile-arcs?
> 
> Compiling with g++ -pg -g -mcpu=athlon-xp -march=athlon-xp -O6
> -ffast-math -fprofile-arcs, then running 
> 
> gprof -l  exechns27 > prof
> 
> The results I get don't seem to make sense.  What am I doing wrong?

Compiling with g++ -mcpu=athlon-xp -march=athlon-xp -O6 -ftest-coverage
-ffast-math -fprofile-arcs, then running 

gcov source.c