[bug #34608] comparison of unsigned expression < 0 is always false

[Daniel Herring]

Follow-up Comment #11, bug #34608 (project make):

Don't reopen this for me, but you might consider doing this check at configure
time.

>From a quick look, I didn't see something like AC_IS_SIGNED.  However it
shouldn't be hard to wrap AC_COMPILE_IFELSE around an array-bound test that
triggers a failure if a type is unsigned.  From a quick web search, here's an
example test.
http://blog.tsunanet.net/2008/09/compile-time-assertion-to-detect-signed.html

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