From: Antonio Ospite <ao2@ao2.it>
Date: Thu, 22 Oct 2015 09:06:31 +0000 (+0200)
Subject: Makefile: fix warnings when compiling with clang++
X-Git-Url: https://git.ao2.it/experiments/opencv_trail_effect.git/commitdiff_plain/a089660fff6dca996af8fcf584f58864446d746a?hp=a089660fff6dca996af8fcf584f58864446d746a

Makefile: fix warnings when compiling with clang++

Clang does not support some options and gives warnings:

  warning: unknown warning option '-Wunsafe-loop-optimizations';
  warning: unknown warning option '-Wunused-but-set-variable';

So add them only when the compiler is not clang.
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