macOS build with latest clang from Xcode

A bunch of new warnings appeared by default on macOS compiler provided with Xcode,
including on every usage of sprintf(). Suppress those for now.

The issues with utilizing WANT_ASAN=1 on the make command line with macOS seem
to be resolved in this latest version, so allow it to be specified. Don't specify
it if using a problematic clang version.

sys/unix/hints/include/compiler.370

@@ -29,9 +29,9 @@ CCFLAGS = -g
 #    CPLUSPLUS_NEED_DEPSUPPRESS = 1 C++ -Wno-deprecated-copy,
 #                                       -Wno-deprecated-declarations
 
-#ifeq "$(WANT_ASAN)" "1"
-#NEED_ASAN=1
-#endif
+ifeq "$(WANT_ASAN)" "1"
+USE_ASAN=1
+endif
 
 # If you want to override the compiler detection just carried out
 # uncomment one of the following pairs. Note, however, that
@@ -63,10 +63,6 @@ CFLAGS+=-Wmissing-prototypes
 CFLAGS+=-Wold-style-definition
 CFLAGS+=-Wstrict-prototypes
 
-#ifeq "$(NEED_ASAN)" "1"
-#CFLAGS+=-fsanitize=address
-#endif
-
 #detection of clang vs gcc
 CCISCLANG := $(shell echo `$(CC) --version` | grep clang)
 ifeq "$(CCISCLANG)" ""
@@ -89,6 +85,10 @@ endif   # GCC greater than or equal to 9
 else   # gcc or clang?
 CXX=clang++ -std=gnu++11
 # clang-specific follows
+CLANGGTEQ14 := $(shell expr `$(CC) -dumpversion | cut -f1 -d.` \>= 14)
+ifeq "$(CLANGGTEQ14)" "1"
+CFLAGS+=-Wno-deprecated-declarations
+endif
 # none
 endif  # clang-specific ends here
 
@@ -139,6 +139,9 @@ CLANGPPGTEQ14 := $(shell expr `$(CXX) -dumpversion | cut -f1 -d.` \>= 14)
 ifeq "$(CLANGPPGTEQ9)" "1"
 #CCXXFLAGS+=-Wformat-overflow
 endif
+ifeq "$(CLANGPPGTEQ14)" "1"
+CPLUSPLUS_NEED_DEPSUPPRESS=1
+endif
 ifdef CPLUSPLUS_NEED_DEPSUPPRESS
 CCXXFLAGS+=-Wno-deprecated
 CCXXFLAGS+=-Wno-deprecated-declarations