Add -Werror=undef to default warnflags for core

eregon · eregon · commit 8b32de2ec9b7 · 2021-05-04T14:56:55.000+02:00
* See [Feature #17752]
* For external extensions it's transformed to just warn and not error (-Wundef)
  like other other -Werror in warnflags.
diff --git a/configure.ac b/configure.ac
@@ -627,6 +627,7 @@ AS_CASE(["$GCC:${warnflags+set}:${extra_warnflags:+set}:"],
 		 -Werror=pointer-arith \
 		 -Werror=shorten-64-to-32 \
 		 -Werror=write-strings \
+		 -Werror=undef \
 		 -Wimplicit-fallthrough=0 \
 		 -Wmissing-noreturn \
 		 -Wno-cast-function-type \
