[llvm-bugs] [Bug 46368] New: Add support for source path fixup during disassembly

[via llvm-bugs]

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

            Bug ID: 46368
           Summary: Add support for source path fixup during disassembly
           Product: tools
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: llvm-objdump
          Assignee: unassignedbugs at nondot.org
          Reporter: pat.pannuto at gmail.com
                CC: llvm-bugs at lists.llvm.org

As discussed on the mailing list:
http://lists.llvm.org/pipermail/llvm-dev/2020-June/142335.html

Replicating relevant bits of the mailing list post:

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*.


llvm-objdump needs this or another mechanism to allow remapping of source paths
to support disassembly with source of reproducibly built artifacts.

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