Bug#844096: gringo: please make the build reproducible

[Reiner Herrmann]

Source: gringo
Version: 4.5.4-3
Severity: wishlist
Tags: patch upstream
User: reproducible-builds at lists.alioth.debian.org
Usertags: fileordering
X-Debbugs-Cc: reproducible-builds at lists.alioth.debian.org

Hi!

While working on the "reproducible builds" effort [1], we have noticed
that gringo could not be built reproducibly.
During build it links objects in non-deterministic order.

The attached patch fixes this by sorting the list of source files.

Regards,
 Reiner

[1]: https://wiki.debian.org/ReproducibleBuilds
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