[llvm-dev] How to fixup source paths during objdump disassembly?

[James Henderson via llvm-dev]

As far as I'm aware, there is no equivalent option in llvm-objdump
currently unfortunately. We should add it. Could you file a bug against
llvm-objdump to that effect?

James

On Tue, 16 Jun 2020 at 22:27, Pat Pannuto via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi folks,
>
> As part of our build, the Tock project uses remap-path-prefix [1] to
> create a reproducible build. This means that the paths inside of built
> artifacts are not full source paths. When we later attempt to produce a
> listings file, the source mapping fails. The result is many copies of this
> recently merged warning [2]:
>
>      llvm-objdump: warning:
> '/Volumes/code/helena-project/tock/target/thumbv7em-none-eabi/release/hail.elf':
> failed to find source chips/sam4l/src/eic.rs
>
> It looks like GNU objdump provides a --prefix option to address this exact
> problem [3]:
>
> *    --prefix=**prefix*     Specify *prefix* to add to the absolute paths
> when used with *-S*.
>
> But I can't find an equivalent mechanism in llvm-objdump.
>
> What's the correct way to point objdump to source files during disassembly?
>
> To reproduce the problem, `make lst` in any of the boards for the
> Tock Operating System (e.g.
> https://github.com/tock/tock/tree/master/boards/hail ) will produce many
> missing file warnings.
>
> Thanks for your help!
>
> -Pat
>
> [1]
> https://doc.rust-lang.org/1.24.0/unstable-book/compiler-flags/remap-path-prefix.html
> [2] https://reviews.llvm.org/D62462
> [3] https://linux.die.net/man/1/objdump
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