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

[Pat Pannuto via llvm-dev]

Filed https://bugs.llvm.org/show_bug.cgi?id=46368

Thanks!

-Pat

On Wed, Jun 17, 2020 at 11:32 AM Sterling Augustine <saugustine at google.com>
wrote:

> llvm-symbolizer has --relativenames, which is close. It would only take a
> bit of plumbing to add that to llvm-objdump.
>
> On Wed, Jun 17, 2020 at 8:12 AM James Henderson via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>> 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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>>> llvm-dev at lists.llvm.org
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>>>
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>
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