[cfe-dev] Add new compilation directives to clang?

[zhunan]

Hi,all

I just develop some programs which need a new compilation directives,it
just like OpenMP's directives(#pragma omp parallel for),

for example,I want Clang to recognize "#pragma GCB i" and then change i
to idx_i when it generate LLVM IR.

what should I do to archieve this?

Thanks for all

Zhunan