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`-mypass` should be only recognize by the backend part (i.e. llvm). You should add `-mllvm` to tell clang the following argument have to be passed to the backend part. 2018-01-08 8:02 GMT+08:00 sangeeta chowdhary via llvm-dev < llvm-dev at lists.llvm.org>: > Hello, > > I have followed steps given in - https://stackoverflow.com/ >

Hello, I have followed steps given in - https://stackoverflow.com/questions/29910051/integrating-llvm-passes/48142693#48142693 <https://stackoverflow.com/questions/29910051/integrating-llvm-passes/48142693#48142693>, to integrate my pass with pass manager and run it with clang. I am able to run my pass with opt - opt -mypass but when I try to run it with clang, I always get an error -