[LLVMdev] Circular dependencies

Reid Spencer reid at x10sys.com
Tue Mar 21 16:14:50 PST 2006

Hi Eric,

Its definitely amusing :)

About the only thing I can suggest are:

1. Combine LLVMSparc*.o into one LLVMSparc.a.  That work is already
happening with the new Sparc backend that is being developed. Should be
out in 1.7 (Chris?)

2. Combine the JIT/Interpreter/ExecutionEngine into one .a

I don't know enough about the codegen/target/analysis/ipa stuff to be
able to make any suggestions. Perhaps Chris can shed some light.


On Tue, 2006-03-21 at 18:29 -0500, Eric Kidd wrote:
> Reid added some nice inter-library dependency data to utils/llvm- 
> config/LibDeps.txt.
> There are three sets of circular dependencies between LLVM libraries.  
> If you use any library from one of these sets, you may need to pull  
> in the rest:
>    LLVMCodeGen.o LLVMSelectionDAG.o libLLVMAnalysis.a libLLVMTarget.a
>    libLLVMTransformUtils.a libLLVMipa.a
>    LLVMSparcV9.o LLVMSparcV9InstrSched.o LLVMSparcV9ModuloSched.o
>    LLVMSparcV9RegAlloc.o
>    LLVMExecutionEngine.o LLVMInterpreter.o LLVMJIT.o
> The first set is the most problematic: It includes four *.a files,  
> which means that certain linkers will tend to get confused unless you  
> repeat '-l' flags.
> The odd entry here is libLLVMipa.a, which gets pulled in by something  
> in libLLVMTransformUtils.a, but which doesn't often seem to be needed  
> in practice.
> The third set is also a bit surprising: You always need to link in an  
> interpreter, even when you have a perfectly good JIT.
> I hope this information amuses or informs someone. :-)
> Cheers,
> Eric
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