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Hi Teresa, Thanks for the detailed reply! > How are you creating your bitcode files? I create the bitcode with `-flto=thin -c` and sure it has a GLOBALVAL_SUMMARY_BLOCK. And there’s no RegularLTO partition only ThinLTO bicode. > Where is it aborting in the backend? It aborts at ` report_fatal_error("Failed to setup codegen")` in of codegen() of LTOBackend.cpp. And before that in createTargetMachine() it also warns ‘xxx is not a recognized processor’. But the program should return before run into backend() I...

Hi, I'm working on enabling thinLTO for our custom backend on LLVM-8 with lld to get code size benefits from dead symbol elimination. The code in LTO::run() of LTO.cpp confuses me that, even though thinLTO is specified, runRegularLTO() will be run first and its return value determines whether runThinLTO() will be executed. My question is if it's clearly known that thinLTO is used, is it