[Bug libctf/29547] binutils-2.39: fails to build against cctools nm (no '-B' option support)

[nick.alcock at oracle dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29547

--- Comment #7 from Nick Alcock <nick.alcock at oracle dot com> ---
(Sorry for delay: post-conf collapse, UK bank holiday, massive change of
monitor configuration meaning my displays were scattered all around the
room for a day, etc)

On 14 Sep 2022, slyich at gmail dot com outgrape:

> checking for BSD- or MS-compatible name lister (nm)... =============
> error:
> /nix/store/kpc4vpii3zrnz53b87xvid0rxlqb66cc-cctools-binutils-darwin-949.0.1/bin/nm:
> invalid argument -B
> Usage:
> /nix/store/kpc4vpii3zrnz53b87xvid0rxlqb66cc-cctools-binutils-darwin-949.0.1/bin/nm
> [-agnopruUmxjlfAP[s segname sectname] [-] [-t format] [[-arch <arch_flag>] 
> ...]
> [file ...]
> =============

Oh, multiple lines ending with a usage message, and with the last line
citing the name of the running binary? OK, we can trigger on 'Usage: '
then. (Ew. Still, most unlikely to be a word that appears on the last
line of a legitimate run. This function *really* needs a proper rewrite...)

Try the branch now? (Tested locally as before, plus on mingw.)

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