[llvm-dev] Opt can't find 'hello' pass

[Joshua R Hilke via llvm-dev]

Got it. Thank you. I tried using the new pass manager from the new tutorial as well but was having an issue where the ‘helloworld’ pass would only work if I manually removed all the metadata from my hello.ll file to where the only thing in it was the function. Otherwise, it would run silently and not print out any function names. Any solution to that?


> On Feb 10, 2021, at 2:11 PM, Arthur Eubanks <aeubanks at google.com> wrote:
> 
> That's due to the recent transition to the new pass manager. Adding -enable-new-pm=0 to the opt command should work.
> 
> I'll update the documentation to explicitly say that the legacy pass manager is no longer the default in big red letters.
> 
> On Wed, Feb 10, 2021 at 1:49 PM Joshua R Hilke via llvm-dev <llvm-dev at lists.llvm.org <mailto:llvm-dev at lists.llvm.org>> wrote:
> I’m just trying to run the hello world example from the LLVM Writing a Pass Tutorial (https://llvm.org/docs/WritingAnLLVMPass.html <https://llvm.org/docs/WritingAnLLVMPass.html>), but whenever I run:
> 
> $BUILD_DIR/bin/clang -c -emit-llvm hello.c
> 
> $BUILD_DIR/bin/opt -load $BUILD_DIR/lib/LLVMHello.so -hello < hello.bc > /dev/null
> 
> 
> 
> I get the following error:
> 
> bin/opt: unknown pass name ‘hello’
> 
> 
> 
> Which seems odd because if I run:
> 
> $BUILD_DIR/bin/opt -load $BUILD_DIR/lib/LLVMHello.so --help | grep hello
> 
> 
> I get:
> 
> --hello 		- Hello World Pass
> 
> 
> To build LLVM I’m running the following commands from my build directory:
> 
> cmake -G Ninja -DLLVM_ENABLE_PROJECTS=‘clang’ ../llvm
> 
> cmake --build . 
> 
> 
> Just to clarify, I’m not writing my own pass. Just trying to run the ‘hello’ pass that comes default when building LLVM
> 
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