Missing debug information

[bbbshaw]

Hi,

I use wasi-sdk to compile a simple c program and use objdump to print the .wasm file information. I found that when using -O0 as the optimization level, the debug information can be seen. However, when using -O2 as the optimization level, the debug information would be lost.

Here is the simple c program:

#include <stdio.h>

int main(void){
    printf("helloworld");
}

I use the following command to compile:

/wasi-sdk-20.0/bin/clang --sysroot /wasi-sdk-20.0/share/wasi-sysroot helloworld.c -g -O2 -o hello.wasm

I use the following command to dump the .wasm file:

llvm-objdump -S -l hello.wasm

The result doesn't show any debug information.

[abrown]

Is it possible you're running into llvm/llvm-project#55781?

[sbc100]

Do you have wasm-opt in your path?

[bbbshaw]

Is it possible you're running into llvm/llvm-project#55781?

Thanks for sharing this issue. I believe it's the reason why debug information is missing.

[bbbshaw]

Do you have wasm-opt in your path?

Yes, I got wasm-opt in my path.

[abrown]

We really need to fix that issue. In the meantime, how do you feel about closing this one to avoid duplicates?

[bbbshaw]

We really need to fix that issue. In the meantime, how do you feel about closing this one to avoid duplicates?

Sure, I appreciate your help and will close this issue.