Add ENABLE_ASAN mechanism for developer use

configure/CONFIG.gnuCommon

@@ -24,9 +24,14 @@ LD = $(GNU_BIN)/$(CMPLR_PREFIX)ld$(CMPLR_SUFFIX) -r
 CPP = $(CC) -x c -E
 RANLIB = $(GNU_BIN)/$(CMPLR_PREFIX)ranlib$(CMPLR_SUFFIX)
 
+# Requires at least GCC 4.8 or LLVM (clang) 3.1
+ASAN_FLAGS_YES = -fsanitize=address
+ASAN_LDFLAGS_YES = $(ASAN_FLAGS_YES)
+
 PROF_CFLAGS_YES = -p
 GPROF_CFLAGS_YES = -pg
 CODE_CFLAGS = $(PROF_CFLAGS_$(PROFILE)) $(GPROF_CFLAGS_$(GPROF))
+CODE_CFLAGS += $(ASAN_FLAGS_$(ENABLE_ASAN))
 WARN_CFLAGS_YES = -Wall
 WARN_CFLAGS_NO = -w
 OPT_CFLAGS_YES = -O3
@@ -35,12 +40,14 @@ OPT_CFLAGS_NO = -g
 PROF_CXXFLAGS_YES = -p
 GPROF_CXXFLAGS_YES = -pg
 CODE_CXXFLAGS = $(PROF_CXXFLAGS_$(PROFILE)) $(GPROF_CXXFLAGS_$(GPROF))
+CODE_CXXFLAGS += $(ASAN_FLAGS_$(ENABLE_ASAN))
 WARN_CXXFLAGS_YES = -Wall
 WARN_CXXFLAGS_NO = -w
 OPT_CXXFLAGS_YES = -O3
 OPT_CXXFLAGS_NO = -g
 
 CODE_LDFLAGS = $(PROF_CXXFLAGS_$(PROFILE)) $(GPROF_CXXFLAGS_$(GPROF))
+CODE_LDFLAGS += $(ASAN_LDFLAGS_$(ENABLE_ASAN))
 
 PIPE_CFLAGS_YES_YES = -pipe
 PIPE_CFLAGS = $(PIPE_CFLAGS_$(GCC_PIPE)_$(GNU))

configure/os/CONFIG_SITE.Common.linux-x86

@@ -54,3 +54,7 @@ OPT_CXXFLAGS_YES += -g
 # Tune GNU compiler output for a specific 32-bit cpu-type
 # (e.g. generic, native, i386, i686, pentium2/3/4, prescott, k6, athlon etc.)
 GNU_TUNE_CFLAGS = -mtune=generic
+
+
+# Developers using a suitable compiler may enable its address sanitizer:
+#ENABLE_ASAN = YES

configure/os/CONFIG_SITE.Common.linux-x86_64

@@ -50,3 +50,7 @@ OPT_CXXFLAGS_YES += -g
 # Tune GNU compiler output for a specific 64-bit cpu-type
 # (e.g. generic, native, core2, nocona, k8, opteron, athlon64, barcelona etc.)
 GNU_TUNE_CFLAGS = -mtune=generic
+
+
+# Developers using a suitable compiler may enable its address sanitizer:
+#ENABLE_ASAN = YES