[LLVMbugs] [Bug 15567] llvm-extract alters linkage of symbols

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=15567

Rafael Ávila de Espíndola <rafael.espindola at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

--- Comment #4 from Rafael Ávila de Espíndola <rafael.espindola at gmail.com> ---
I think this is a developer/debugging tool and should not be used in a product.

It is used for bisecting a problem. Lets say we have a foo.bc file that
triggers a bug somewhere. We can run

$ llvm-extract -func=foo -o bar1.bc
$ llvm-extract -delete -func=foo -o bar2.bc
$ llc ... bar1.bc -o bar1.o
$ good-llc ... bar2.bc -o bar2.o
# Link bar2.o and bar1.o and see if it has the bug. If so, we can continue the
reduction looking only at function foo.

For this to work, internal symbols have to be converted to default ones with
hidden visibility.

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