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The introspection interpreter sometimes produces targets with no source
files; BuildTarget will then pick a random compiler, according to the
order in clink_langs.
According to the comment in sort_clink, clink_langs are supposed
to list languages from *lowest* to highest priority. However,
process_compilers_late() process clink_langs in straight order and
returns the first language; which is the one with lowest priority.
This became visible with the addition of Rust to clink_langs,
because Rust has limitation on the names of library targets, but
the bug existed before.
Fixes: e49f2f7283e1d9f18e2f5f54647c07287cd70339
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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