nikic wrote:

Thanks, this does help. After this I'm not seeing any significant increase in 
startup overhead anymore, at least in casual testing.

libclang-cpp.so size is 72M without CIR, 132M with CIR and 103M with CIR and 
this patch, so it cuts the size increase roughly by half.

The tradeoff is that cir-opt and cir-translate go from <1M each to ~27M each, 
because they no longer use the dylib. Probably still worthwhile, the size of 
those is likely less important.

The fact that libclang-cpp.so shrinks so much (even without LTO) probably 
indicates that we can still substantially reduce the fraction of MLIR that 
actually needs to be built as a dependency of CIR? If we end up trivially 
DCEing half of it...

https://github.com/llvm/llvm-project/pull/232409
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