Add support for GCC sanitizers: address (asan), leak (lsan) and
undefined behavior (ubsan).  These can be toggled in ./configure with
--enable-asan, --enable-lsan and --enable-ubsan.

The autoconf code for this derived from ell (mostly authored by Mat
Martineau <mathew.j.martineau@linux.intel.com>):
https://git.kernel.org/pub/scm/libs/ell/ell.git

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
---
 HACKING      |  5 ++++-
 acinclude.m4 | 36 ++++++++++++++++++++++++++++++++++++
 configure.ac | 45 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 85 insertions(+), 1 deletion(-)

diff --git a/HACKING b/HACKING
index 7326242506a6..40bde2fb3c8b 100644
--- a/HACKING
+++ b/HACKING
@@ -51,8 +51,11 @@ like this:
     # git clone git://git.kernel.org/pub/scm/network/.../neard.git
     # cd neard
 
-  Configure and build
+  Configure (choose only one)
     # ./bootstrap-configure
+    # ./bootstrap-configure --enable-asan --enable-lsan --enable-ubsan
+
+  Build
     # make
 
   Check installation
diff --git a/acinclude.m4 b/acinclude.m4
index a12b93972cfa..e9ad0d63cc8c 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -9,3 +9,39 @@ AC_DEFUN([NEARD_PROG_CC_PIE], [
 		rm -rf conftest*
 	])
 ])
+
+AC_DEFUN([NEARD_PROG_CC_ASAN], [
+AC_CACHE_CHECK([whether ${CC-cc} accepts -fsanitize=address], neard_cv_prog_cc_asan, [
+	echo 'void f(){}' > conftest.c
+	if test -z "`${CC-cc} -fsanitize=address -c conftest.c 2>&1`"; then
+		neard_cv_prog_cc_asan=yes
+	else
+		neard_cv_prog_cc_asan=no
+	fi
+	rm -rf conftest*
+])
+])
+
+AC_DEFUN([NEARD_PROG_CC_LSAN], [
+AC_CACHE_CHECK([whether ${CC-cc} accepts -fsanitize=leak], neard_cv_prog_cc_lsan, [
+	echo 'void f(){}' > conftest.c
+	if test -z "`${CC-cc} -fsanitize=leak -c conftest.c 2>&1`"; then
+		neard_cv_prog_cc_lsan=yes
+	else
+		neard_cv_prog_cc_lsan=no
+	fi
+	rm -rf conftest*
+])
+])
+
+AC_DEFUN([NEARD_PROG_CC_UBSAN], [
+AC_CACHE_CHECK([whether ${CC-cc} accepts -fsanitize=undefined], neard_cv_prog_cc_ubsan, [
+	echo 'void f(){}' > conftest.c
+	if test -z "`${CC-cc} -fsanitize=undefined -c conftest.c 2>&1`"; then
+		neard_cv_prog_cc_ubsan=yes
+	else
+		neard_cv_prog_cc_ubsan=no
+	fi
+	rm -rf conftest*
+])
+])
diff --git a/configure.ac b/configure.ac
index 1ec6f4eb30ea..c1fdc44ae02d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -26,6 +26,9 @@ AC_LANG([C])
 
 AC_PROG_CC
 NEARD_PROG_CC_PIE
+NEARD_PROG_CC_ASAN
+NEARD_PROG_CC_LSAN
+NEARD_PROG_CC_UBSAN
 AC_PROG_INSTALL
 AC_PROG_MKDIR_P
 
@@ -98,6 +101,48 @@ AC_ARG_ENABLE(pie, AS_HELP_STRING([--enable-pie],
 AC_CHECK_LIB(dl, dlopen, dummy=yes,
 			AC_MSG_ERROR(dynamic linking loader is required))
 
+save_LIBS=$LIBS
+AC_CHECK_LIB(asan, _init)
+LIBS=$save_LIBS
+
+AC_ARG_ENABLE(asan, AC_HELP_STRING([--enable-asan],
+			[enable linking with address sanitizer]), [
+	if (test "${enableval}" = "yes" &&
+				test "${ac_cv_lib_asan__init}" = "yes" &&
+				test "${neard_cv_prog_cc_asan}" = "yes"); then
+		CFLAGS="$CFLAGS -fsanitize=address";
+		LDFLAGS="$LDFLAGS -fsanitize=address"
+	fi
+])
+
+save_LIBS=$LIBS
+AC_CHECK_LIB(lsan, _init)
+LIBS=$save_LIBS
+
+AC_ARG_ENABLE(lsan, AC_HELP_STRING([--enable-lsan],
+			[enable linking with leak sanitizer]), [
+	if (test "${enableval}" = "yes" &&
+				test "${ac_cv_lib_lsan__init}" = "yes" &&
+				test "${neard_cv_prog_cc_lsan}" = "yes"); then
+		CFLAGS="$CFLAGS -fsanitize=leak";
+		LDFLAGS="$LDFLAGS -fsanitize=leak"
+	fi
+])
+
+save_LIBS=$LIBS
+AC_CHECK_LIB(ubsan, _init)
+LIBS=$save_LIBS
+
+AC_ARG_ENABLE(ubsan, AC_HELP_STRING([--enable-ubsan],
+			[enable linking with undefined behavior sanitizer]), [
+	if (test "${enableval}" = "yes" &&
+				test "${ac_cv_lib_ubsan__init}" = "yes" &&
+				test "${neard_cv_prog_cc_ubsan}" = "yes"); then
+		CFLAGS="$CFLAGS -fsanitize=undefined";
+		LDFLAGS="$LDFLAGS -fsanitize=undefined"
+	fi
+])
+
 GLIB_DEPS="glib-2.0 >= 2.28"
 PKG_CHECK_MODULES(GLIB, [${GLIB_DEPS}], dummy=yes,
 				AC_MSG_ERROR(GLib >= 2.28 is required))
-- 
2.27.0