From 7f788a0d19500a95b17edf5d6fba18cb97ea7cdb Mon Sep 17 00:00:00 2001
From: Matthew Fernandez <matthew.fernandez@gmail.com>
Date: Tue, 15 Sep 2020 18:47:30 -0700
Subject: [PATCH] use api.prefix to set gml parser's prefix

Related to #1806.
---
 cmd/tools/gmlparse.y | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/cmd/tools/gmlparse.y b/cmd/tools/gmlparse.y
index b3dd1b899..c3e3bde86 100644
--- a/cmd/tools/gmlparse.y
+++ b/cmd/tools/gmlparse.y
@@ -13,6 +13,12 @@
 
 %require "3.0"
 
+  /* By default, Bison emits a parser using symbols prefixed with "yy". Graphviz
+   * contains multiple Bison-generated parsers, so we alter this prefix to avoid
+   * symbol clashes.
+   */
+%define api.prefix {gml}
+
 %{
 #include <stdlib.h>
 #include <stddef.h>
-- 
2.50.1