Define weak symbols as per a comment in PHPC-406

derickr · derickr · commit 392e6f1412a0 · 2015-12-02T18:11:46.000Z
diff --git a/config.m4 b/config.m4
@@ -427,6 +427,8 @@ else
   AC_SUBST(MONGOC_HAVE_SASL_CLIENT_DONE, 0)
 fi
 
+AC_SUBST(MONGOC_HAVE_WEAK_SYMBOLS, 1)
+
   m4_include(src/libmongoc/build/autotools/m4/ax_pthread.m4)
   AX_PTHREAD
 
