warn about ASAN limitation ASLR > 28bits

lib/Makefile

@@ -77,6 +77,10 @@ ifeq ($(WITHASAN),1)
 	WASAN := -fsanitize=address
 	# Force the disable of JEMALLOC, since ASAN isn't compatible.
 	export NOJEMALLOC=1
+	# workaroud ASAN limitation ASLR > 28bits
+	# https://github.com/google/sanitizers/issues/1716
+	# sudo sysctl vm.mmap_rnd_bits=28
+    $(warning ASAN needs ASLR =< 28bits, make sure 'sysctl vm.mmap_rnd_bits=28' is set.)
 endif
 
 NOJEM :=

src/Makefile

@@ -140,6 +140,10 @@ ifeq ($(WITHASAN),1)
 	WASAN := -fsanitize=address
 	# Force the disable of JEMALLOC, since ASAN isn't compatible.
 	export NOJEMALLOC=1
+	# workaroud ASAN limitation ASLR > 28bits
+	# https://github.com/google/sanitizers/issues/1716
+	# sudo sysctl vm.mmap_rnd_bits=28
+    $(warning ASAN needs ASLR =< 28bits, make sure 'sysctl vm.mmap_rnd_bits=28' is set.)
 endif
 ifeq ($(TEST_WITHASAN),1)
 	WASAN += -DTEST_WITHASAN

test/tap/tap/Makefile

@@ -50,9 +50,12 @@ STDCPP := -std=c++$(shell echo $(CPLUSPLUS) | cut -c3-4) -DCXX$(shell echo $(CPL
 WASAN :=
 ifeq ($(WITHASAN),1)
 	WASAN := -fsanitize=address
+	# Force the disable of JEMALLOC, since ASAN isn't compatible.
+	export NOJEMALLOC=1
 	# workaroud ASAN limitation ASLR > 28bits
 	# https://github.com/google/sanitizers/issues/1716
-	DUMMY := $(shell sudo sysctl vm.mmap_rnd_bits=28)
+	# sudo sysctl vm.mmap_rnd_bits=28
+    $(warning ASAN needs ASLR =< 28bits, make sure 'sysctl vm.mmap_rnd_bits=28' is set.)
 endif
 
 OPT := $(STDCPP) -O2 -ggdb -Wl,--no-as-needed $(WASAN)

test/tap/tests/Makefile

@@ -148,9 +148,12 @@ endif
 WASAN :=
 ifeq ($(WITHASAN),1)
 	WASAN := -fsanitize=address -DTEST_WITHASAN
+	# Force the disable of JEMALLOC, since ASAN isn't compatible.
+	export NOJEMALLOC=1
 	# workaroud ASAN limitation ASLR > 28bits
 	# https://github.com/google/sanitizers/issues/1716
-	DUMMY := $(shell sudo sysctl vm.mmap_rnd_bits=28)
+	# sudo sysctl vm.mmap_rnd_bits=28
+    $(warning ASAN needs ASLR =< 28bits, make sure 'sysctl vm.mmap_rnd_bits=28' is set.)
 endif
 
 OPT := $(STDCPP) -O2 -ggdb -Wl,--no-as-needed -Wl,-rpath,$(TAP_LDIR) $(WGCOV) $(WASAN) -DGITVERSION=\"$(GIT_VERSION)\"

test/tap/tests_with_deps/deprecate_eof_support/Makefile

@@ -103,9 +103,12 @@ endif
 WASAN :=
 ifeq ($(WITHASAN),1)
 	WASAN := -fsanitize=address
+	# Force the disable of JEMALLOC, since ASAN isn't compatible.
+	export NOJEMALLOC=1
 	# workaroud ASAN limitation ASLR > 28bits
 	# https://github.com/google/sanitizers/issues/1716
-	DUMMY := $(shell sudo sysctl vm.mmap_rnd_bits=28)
+	# sudo sysctl vm.mmap_rnd_bits=28
+    $(warning ASAN needs ASLR =< 28bits, make sure 'sysctl vm.mmap_rnd_bits=28' is set.)
 endif
 
 OPT := $(STDCPP) -O2 -ggdb -Wl,--no-as-needed -Wl,-rpath,"../../tap" $(WGCOV) $(WASAN)