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 (file)
--- 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)