llvm-gcc creates two functions for one function with two prototypes

[llvmbot]

Bugzilla Link	232
Resolution	DUPLICATE
Resolved on	Feb 22, 2010 12:48
Version	1.0
OS	All
Attachments	C code to reproduce the problem, Erroneously generated LLVM assembly code
Reporter	LLVM Bugzilla Contributor

Extended Description

If a function is given two different function prototypes, llvm-gcc generates two
separate functions instead of a single function.

The attached C code and assembly code demonstate the problem.

[llvmbot]

assigned to @lattner

[llvmbot]

Also, I should note that this is reduced from 134.perl from SPEC95. This
benchmark won't work until this bug is fixed.
:(

[lattner]

Thanks for reducing and filing this John. I definitely want to get this fixed,
but may not get to it until after wednesday. Actually, doing it after you fix
the remaining problems in the merge tree probably makes the most amount of
sense. The rest of spec95 will hopefully still work though. :)

-Chris

[lattner]

I think that this is a bug in the testcase. If you compile with -W, you get a
warning on the line of the local declaration that 'myfunc' is defined but not
used. John, can you look this up in the relevant C spec or try it with a
"native" GCC 3.4 compiler?

-Chris

[llvmbot]

FWIW, on the MacOSX system compiler, you get no warning or error from the compiler or the linker with
the given C code, even with -W -Wall. I don't have a 3.4-HEAD native build handy though; this is with
3.3. I will copy you privately on the part of the C std. which I think is applicable.

[lattner]

Ok, Brian convinced me off line that this is a bug and it needs to be fixed :)

-Chris

[lattner]

The fix for Bug 244 fixes this bug as well.

-Chris

*** This bug has been marked as a duplicate of 244 ***

[lattner]

mentioned in issue llvm/llvm-bugzilla-archive#244