to ``__llvm_profile_write_file``.
* Forward-declare ``int __llvm_profile_write_file(void)`` and call it to write
- out a profile. Calling this function multiple times appends profile data to
- an existing on-disk raw profile.
+ out a profile. This function returns 0 when it succeeds, and a non-zero value
+ otherwise. Calling this function multiple times appends profile data to an
+ existing on-disk raw profile.
Drawbacks and limitations
=========================