[LLVMdev] Profiling dynamically loaded libraries

[Chris Lattner]

On Thu, 8 Jun 2006, Domagoj Babic wrote:
> Standard approach to profiling dynamically loaded libraries with
> gprof doesn't seem to work with LLVM:
>
> export LD_PROFILE=Mylib.so
> export LD_PROFILE_OUTPUT=.

I've never used these before.

> make ENABLE_PROFILING=1  // compiling my project

This *should* work, but hasn't been tested for a very long time.  You 
could try passing VERBOSE=1 to make to see if it is compiling LLVM right. 
Also, make sure that both LLVM and your project are compiled with that.

> opt -load Profile/Mylib.so -options...
>
> but no Mylib.so.profile (or gmon.out) is produced. Profiling
> libc.so.6 usage by "ls -l", however, works fine.
>
> Could anyone explain me what am I doing wrong?

I don't know, other than you should make sure that LLVM is compiled with 
profile info too.

-Chris

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