config/options: add support for using sanitizer in debug builds

This allows enabling eg the address or leak sanitizer.
Usually both CFLAGS and LDFLAGS need to be set to the same
value and often it's advisable to set additions options
like -fstack-protector-strong or -fno-omit-frame-pointer.

DEBUG_SANITIZER_FLAGS sets both DEBUG_SANITIZER_CFLAGS and
DEBUG_SANITIZER_LDFLAGS to the same value.

Signed-off-by: Matthias Reichl <hias@horus.com>

Author: HiassofT

config/options

@@ -149,6 +149,24 @@ if [ -z "${CONFIG_SHELL}" ] && [ -x "/bin/dash" ]; then
   export CONFIG_SHELL="/bin/dash"
 fi
 
+# enable gcc sanitizer support in debug builds
+# DEBUG_SANITIZER_FLAGS sets both CFLAGS and LDFLAGS
+if [ "${DEBUG:-no}" != "no" ]; then
+  if [ -n "${DEBUG_SANITIZER_FLAGS}" ]; then
+    DEBUG_SANITIZER_CFLAGS="${DEBUG_SANITIZER_FLAGS}"
+    DEBUG_SANITIZER_LDFLAGS="${DEBUG_SANITIZER_FLAGS}"
+  fi
+  if [ -n "${DEBUG_SANITIZER_CFLAGS}" ] || [ -n "${DEBUG_SANITIZER_LDFLAGS}" ]; then
+    SANITIZER_SUPPORT="yes"
+  else
+    SANITIZER_SUPPORT="no"
+  fi
+else
+  SANITIZER_SUPPORT="no"
+  DEBUG_SANITIZER_CFLAGS=""
+  DEBUG_SANITIZER_LDFLAGS=""
+fi
+
 check_config
 
 . config/graphic