Makefile: Enable address sanitizer with DEBUG_ASAN=1

The Address Sanitizer (built in GCC and LLVM) is an extremely powerful
tool, moreso than e.g. Valgrind for detecting memory issues.

It is not available on every architecture/OS combination (see
https://github.com/google/sanitizers/wiki/AddressSanitizer), so it can
only be enabled by compiling with DEBUG_ASAN=1.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>

diff --git a/Makefile b/Makefile
index be94391..57fee2f 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -12,6 +12,9 @@ else
 CFLAGS += -O2 -DNDEBUG
 endif
 endif
+ifeq ($(DEBUG_ASAN), 1)
+CFLAGS += -fsanitize=address
+endif
 CFLAGS += -DP_HAVE_MMAP=$(if $(NO_MMAP),0,1) \
          -DP_HAVE_PTHREAD=$(if $(NO_PTHREAD),0,1) \
          -DP_HAVE_POSIX_MEMALIGN=$(if $(NO_POSIX_MEMALIGN),0,1) \
@@ -45,6 +48,9 @@ endif
 CC_LINK ?= $(CC)
 CC_AS ?= $(CC)
 LDFLAGS += $(MAIN_LDFLAGS)
+ifeq ($(DEBUG_ASAN), 1)
+LDFLAGS += -static-libasan
+endif
 EXTRA_LDFLAGS ?= -Wl,-Map=$@.map
 LDLIBS += $(MAIN_LDLIBS)
 ifdef PCNT