[LLVMdev] opt -dot-cfg

[neda 8664]

  I use "opt -dot-cfg sample.bc" command to view cfg, but I encountered the
following warning.

WARNING: You're attempting to print out a bitcode file.
This is inadvisable as it may cause display problems. If
you REALLY want to taste LLVM bitcode first-hand, you
can force output with the `-f' option.

I see unmeaning thing when use -f , in additinal I've installed graphvis
software,
can anyone help me?
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