use api.prefix to set gml parser's prefix

Related to #1806.

diff --git a/cmd/tools/gmlparse.y b/cmd/tools/gmlparse.y
index b3dd1b899d7a8f3b85767f8eb2edb7ad3edd8caa..c3e3bde86aa263fbc595663c48adcbfdfcfc1514 100644 (file)
--- 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>