[LLVMdev] dragonegg polly support broken?

Tobias Grosser tobias at grosser.es
Sun Oct 21 08:38:21 PDT 2012

On 10/20/2012 05:38 PM, Jack Howarth wrote:
> Duncan,
>      Is the documentation for using Polly support in dragonegg correct? I built llvm/polly/dragonegg
> using the documentation at http://polly.llvm.org/example_load_Polly_into_dragonegg.html
> with...
> GCC=/sw/lib/gcc4.7/bin/gcc-4 LLVM_CONFIG=/sw/opt/llvm-3.2/bin/llvm-config ENABLE_LLVM_PLUGINS=1 make CPPFLAGS="-DENABLE_LTO -I/sw/include"
> The resulting dragonegg plugin works fine as...
> /sw/lib/gcc4.7/bin/gcc-4 -fplugin=/sw/lib/gcc4.7/lib/dragonegg.so -O3  himenoBMTxpa.c
> but if I try to invoke polly with...
> /sw/lib/gcc4.7/bin/gcc-4 -fplugin=/sw/lib/gcc4.7/lib/dragonegg.so -O3 -fplugin-arg-dragonegg-llvm-option=load:/sw/opt/llvm-3.2/lib/LLVMPolly.dylib himenoBMTxpa.c
> I get the error...
> cc1: Unknown command line argument 'load=/sw/opt/llvm-3.2/lib/LLVMPolly.dylib'.  Try: 'cc1 -help'

I think the website is wrong. You probably need to add a '-' before the 
'load'. See the following:


Please let me know if this works, such that I can update the website.

> Clang gets a little further with...
> clang -Xclang -load -Xclang /sw/opt/llvm-3.2/lib/LLVMPolly.dylib -O3 -mllvm -polly himenoBMTxpa.c
> error: unable to load plugin '/sw/opt/llvm-3.2/lib/LLVMPolly.dylib': 'dlopen(/sw/opt/llvm-3.2/lib/LLVMPolly.dylib, 9): Symbol not found:
>        __ZN4llvm10DataLayout2IDE
>    Referenced from: /sw/opt/llvm-3.2/lib/LLVMPolly.dylib
>    Expected in: flat namespace
>   in /sw/opt/llvm-3.2/lib/LLVMPolly.dylib'
> clang (LLVM option parsing): Unknown command line argument '-polly'.  Try: 'clang (LLVM option parsing) -help'
> clang (LLVM option parsing): Did you mean '-help'?
> This is with llvm/clang/compiler-rt/polly/dragonegg all from svn 166382.

As you realized yourself, Polly and clang need to be in sync. Otherwise 
incompatible symbols cause problems.


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