support WANT_ASAN=1 on make command line in linux.370 and macOS.370

When the address sanitizer is in use for gcc, clang, or visual studio,
(-fsanitize=address) define the NetHack preprocessor symbol USING_ADDRESS_SANITIZER.

include/global.h

@@ -146,6 +146,21 @@ typedef uchar nhsym;
 
 #include "coord.h"
 
+/* define USING_ADDRESS_SANITIZER if ASAN is in use */
+#if defined(__clang__)
+#if defined(__has_feature)
+#if __has_feature(address_sanitizer)
+#define USING_ADDRESS_SANITIZER
+#endif  /* __has_feature */
+#endif  /* __has_feature(address_sanitizer) */
+#else   /* ?__clang__ */
+#if defined(__GNUC__) || defined(_MSC_VER)
+#ifdef __SANITIZE_ADDRESS__
+#define USING_ADDRESS_SANITIZER
+#endif  /* __SANITIZE_ADDRESS__ */
+#endif  /* __GNUC__ || _MSC_VER */
+#endif  /* !__clang__ */
+
 /*
  * Automatic inclusions for the subsidiary files.
  * Please don't change the order.  It does matter.

sys/unix/hints/include/compiler.370

@@ -29,6 +29,9 @@ CCFLAGS = -g
 #    CPLUSPLUS_NEED_DEPSUPPRESS = 1 C++ -Wno-deprecated-copy,
 #                                       -Wno-deprecated-declarations
 
+#ifeq "$(WANT_ASAN)" "1"
+NEED_ASAN=1
+#endif
 
 # If you want to override the compiler detection just carried out
 # uncomment one of the following pairs. Note, however, that
@@ -60,6 +63,10 @@ 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)" ""

sys/unix/hints/linux.370

@@ -56,6 +56,10 @@ endif  # WANT_WIN_QT
 #
 #-INCLUDE multiw-3.370
 
+ifeq "$(NEED_ASAN)" "1"
+LFLAGS+=-fsanitize=address
+endif
+
 ifeq "$(USE_CURSESLIB)" "1"
 # default
 CURSESLIB = -lncurses -ltinfo
@@ -159,7 +163,7 @@ WINX11LIB += -lXpm
 VARDATND0 += rip.xpm
 endif
 WINLIB += $(WINX11LIB)
-LFLAGS=-L/opt/X11/lib
+LFLAGS+=-L/opt/X11/lib
 endif	# WANT_WIN_X11
 
 ifdef WANT_WIN_QT
@@ -294,7 +298,7 @@ endif   # GITSUBMODULES
 DLLIB = -ldl
 
 # Only needed for GLIBC stack trace:
-LFLAGS=-rdynamic
+LFLAGS+=-rdynamic
 
 # if TTY_TILES_ESCCODES
 #WINSRC += tile.c

sys/unix/hints/macOS.370

@@ -72,6 +72,10 @@ endif   # WANT_WIN_QT
 
 #-INCLUDE multiw-3.370
 
+ifeq "$(NEED_ASAN)" "1"
+LFLAGS +=-fsanitize=address
+endif
+
 # NetHack sources control
 NHCFLAGS+=-DDLB
 NHCFLAGS+=-DHACKDIR=\"$(HACKDIR)\"