https://sourceware.org/bugzilla/show_bug.cgi?id=32003
--- Comment #15 from Jan Beulich <jbeulich at suse dot com> ---
(In reply to Benjamin Drung from comment #6)
> That linker testcase snippet is evaluated to:
>
> --package-metadata='{"foo":"bar"}'
>
> Passing that to a shell or makefile works, because the singe quotes protect
> the JSON content inside. But this escaping protects this snippet from
> evaluating only once. The problem is that the linker flag can be passed
> around and evaluated multiple times. This will happen easily during Debian
> package build, where debian/rules is a Makefile that calls the project build
> system (that can use makefiles as well).
That, however, is a problem of the build system. Passing around potentially
quoted strings needs special care, to retain quotation. The issue isn't unique
to Debian; see e.g. the Linux kernel's "escsq" and its uses (and how it further
protects e.g. # and $$).
Imo it's just the commas which are the main problem here, as -Wl,... in the
compiler has - afaik - no way of escaping them.
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