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?ds=sidebyside

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.
---

diff --git a/Makefile b/Makefile
index a008ba9..66355e0 100644
--- a/Makefile
+++ b/Makefile
@@ -18,13 +18,16 @@ CXXFLAGS += -fno-common \
 	    -Wswitch-enum \
 	    -Wundef \
 	    -Wunreachable-code \
-	    -Wunsafe-loop-optimizations \
-	    -Wunused-but-set-variable \
 	    -Wwrite-strings \
 	    -Wp,-D_FORTIFY_SOURCE=2 \
 	    -fstack-protector \
 	    --param=ssp-buffer-size=4
 
+ifneq ($(CXX),clang++)
+  CXXFLAGS += -Wunsafe-loop-optimizations \
+	      -Wunused-but-set-variable
+endif
+
 CXXFLAGS += $(shell pkg-config --cflags opencv)
 LDLIBS += $(shell pkg-config --libs opencv)