llvm dev - Sep 2013 - [LLVMdev] llvm-prof: Error opening 'llvmprof.out': Illegal seek

It is solved.

The problem was trying to profile while the llvmprof.out has not been
generated.

Below, the sequence of instructions that worked with me


$ clang -03 -emit-llvm hello.c -c -o hello.bc
$ opt -insert-edge-profiling hello.bc -o hello.profile.bc

$ llc hello.profile.bc -o hello.profile.s

$ clang -o hello.profile hello.profile.s
<LLVM_HOME_DIR>/build/Debug+Asserts/lib/libprofile_rt.so

$ ./hello.profile

$ llvm-prof hello.profile.bc


and the output is:

===-------------------------------------------------------------------------==LLVM
profiling output for execution:
  

===-------------------------------------------------------------------------==Function
execution frequencies:

 ##   Frequency
  1.     1/1 main

===-------------------------------------------------------------------------==Top
20 most frequently executed basic blocks:

 ##      %% 
	Frequency
  1.   100%     1/1	main() - 




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