Tool Chain Migration: objdump users, please test llvm-objdump

[Brooks Davis]

On Wed, Jun 20, 2018 at 10:46:46AM -0400, Ed Maste wrote:
> Work is in progress to migrate fully to modern and permissively
> licensed components for the tool chain. This includes moving away from
> the three obsolete binutils components that are still in the base
> system (as, ld, objdump). objdump is a tool to report information
> about binary objects (such as headers, symbols, etc.), is not required
> as a build tool, and in any case many uses of objdump are better
> served by readelf.
> 
> For FreeBSD 12 I intend to remove GNU objdump 2.17.50. PR 229046[1] is
> open to track tasks related to its removal, and users who need GNU
> objdump can install an up-to-date version from the ports tree or the
> binutils package.
> 
> That said, llvm includes a somewhat equivalent llvm-objdump, and it is
> built by default in FreeBSD now. If llvm-objdump's command line option
> support and output format is "close enough" to GNU objdump for most
> users we may decide to install it as /usr/bin/objdump. Therefore, I
> would like to ask users of GNU objdump in FreeBSD to give llvm-objdump
> a try. Please let me know if it works for your uses, or describe
> deficiencies that you found.

I think we've changed our flag us in CheriBSD to accommodate llvm-objdump
so at least a few months ago flag compatibility was poor.  The output is
different, but fine for my uses (producing human readable assembly
output).

-- Brooks
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