Fix Clang/MacOS

Author: Girgias

Zend/Zend.m4

@@ -212,9 +212,13 @@ else
   AC_DEFINE(ZEND_DEBUG,0,[ ])
 fi
 
-test -n "$GCC" && CFLAGS="-Wall -Wextra -Wduplicated-cond -Wduplicated-branches -Wlogical-op -Wformat-truncation -Wno-strict-aliasing -Wno-implicit-fallthrough -Wno-unused-parameter -Wno-sign-compare -fno-common $CFLAGS"
+test -n "$GCC" && CFLAGS="-Wall -Wextra -Wno-strict-aliasing -Wno-implicit-fallthrough -Wno-unused-parameter -Wno-sign-compare -fno-common $CFLAGS"
 dnl Check if compiler supports -Wno-clobbered (only GCC)
 AX_CHECK_COMPILE_FLAG([-Wno-clobbered], CFLAGS="-Wno-clobbered $CFLAGS", , [-Werror])
+AX_CHECK_COMPILE_FLAG([-Wduplicated-cond], CFLAGS="-Wduplicated-cond $CFLAGS", , [-Werror])
+AX_CHECK_COMPILE_FLAG([-Wduplicated-branches], CFLAGS="-Wduplicated-branches $CFLAGS", , [-Werror])
+AX_CHECK_COMPILE_FLAG([-Wlogical-op], CFLAGS="-Wlogical-op $CFLAGS", , [-Werror])
+AX_CHECK_COMPILE_FLAG([-Wformat-truncation ], CFLAGS="-Wformat-truncation $CFLAGS", , [-Werror])
 
 test -n "$DEBUG_CFLAGS" && CFLAGS="$CFLAGS $DEBUG_CFLAGS"