[LLVMdev] llvm-link failing depending on order of files

[Russell Wallace]

I need to link several llvm object files (.bc) into a single such file (.ll
or .bc). As I understand it, the tool for doing this is llvm-link. However,
it seems to be failing in some cases depending on the order of files
presented to it.

The simplest test case involves a pair of files.

blank.cpp contains nothing.

main.cpp contains:
#include <llvm/Support/raw_ostream.h>
and may or may not contain a main function that just returns 0; it makes no
difference to the results. (The include directive is, however, required in
order to generate the error.)

llvm-link main.bc blank.bc works.

llvm-link blank.bc main.bc generates a linked object file that on
attempting to convert to an executable, gives the following error message:

a1.ll:30:1: error: unknown selection kind
$"\01??_7_Iostream_error_category at std@@6B@" = comdat
^
1 error generated.

(A slightly more complex test case gives a different error message at
earlier link time.)

Anyone have any idea about the cause of this and how to avoid it?
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