[LLVMdev] Need help with generating executables from llvm
Duncan Sands
baldrick at free.fr
Mon Nov 26 09:16:25 PST 2012
Hi Chinmaya,
> We are using llvm for our project on code generation and we are stuck at
> something very simple but hard to find on the internet. Hence the mail. We need
> to generate .out (executables that can run on linux) from .s file. We are right
> now trying it out on coreutils package(who, ls etc). We have generated who.bc,
> who.s using llvm tools but are unable to get an executable from the .s (rather
> we dont know how to).
gcc who.s
You may need to add libraries, eg
gcc who.s -lm
Your other methods can work too:
> We tried
> 1) llvm-ld (llvm-ld: warning: Ignoring file 'who.bc' because does not contain
> bitcode.).
If who.bc doesn't contain bitcode, what does it contain? This should work
(with the -native flag) is who.bc contains bitcode.
> 2) llc -filetype=obj who.bc , followed by ./who.o (bash: ./who.o: cannot
> execute binary file)
You still need to link the .o. For example:
gcc who.o
You may need to add libraries, eg
gcc who.o -lm
As you can see this is basically the same as for the .s, because a .s is just a
human readable form of a .o really.
Ciao, Duncan.
> The above actually carry out .bc to .o translation. We are more interested in .s
> to .o
>
> We saw this mail on the website and found out we were stuck at kind of the
> same spot. http://lists.cs.uiuc.edu/pipermail/llvmdev/2012-May/050143.html
> Can you help us with it or maybe direct us to a verbose documentation of how
> executables are generated?
>
> --
> Chinmaya Dattathri
> cd25658
> UT ECE
>
>
>
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