[cfe-dev] clang not emitting LLVM bit-code

[Eric Christopher]

There's no bitcode to be emitted from an assembly file.

-eric

On Thu, Apr 17, 2014 at 4:28 PM, Luis David Pedrosa
<luis.pedrosa at usc.edu> wrote:
> Hi everyone,
>
> I'm a PhD Student at the University of Southern California and my thesis
> involves using program analysis techniques to automatically discover
> interoperability issues in protocol implementations.
>
> My analysis is performed on LLVM-bitcode so the first step in analyzing an
> implementation is to get it to compile with clang while emitting LLVM.
>
> I'm currently doing this with chromium, and I have come across a weird
> assembly file which seems to be a part of a third party unicode library that
> clang insists on compiling into a native ELF, despite me trying -emit-llvm
> and -flto. The file in question looks something like this:
> http://www.filewatcher.com/p/chromium-12.0.742.91.tar.bz2.151259660/chromium-12.0.742.91/third_party/icu/linux/icudt46l_dat.S.html
> I'm not sure if this is the same version I have, but I can share mine if
> necessary.
>
> I'm using clang RELEASE_33/final compiled from source. There is no error
> message or any other indication of failure. It quietly succeeds in compiling
> the file, just in the wrong output format.
>
> In my search for related problems, I have seen that this file has been a
> problem with clang before, although it looks like it didn't use to compile
> at all. A work around seemed to involve the -no-integrated-as flag, but that
> didn't help me.
>
> Am I missing something? Is there something else I should try as a work
> around?
>
> Thank you.
>
> -- Luis D. Pedrosa
>
>
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