X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/c373bf8bb8da68ed12b1e73aaa2d777f6c701e46..d9df47b656fd1757f1f36c8f3d823ca9ca5bfe91:/data/yacc.c

diff --git a/data/yacc.c b/data/yacc.c
index 4461f023..f76b06f4 100644
--- a/data/yacc.c
+++ b/data/yacc.c
@@ -37,6 +37,10 @@ m4_define_default([b4_stack_depth_init],  [200])
 ## Pure/impure interfaces.  ##
 ## ------------------------ ##
 
+b4_percent_define_default([[api.pure]], [[false]])
+b4_define_flag_if([pure])
+m4_define([b4_pure_flag],
+          [b4_percent_define_flag_if([[api.pure]], [[1]], [[0]])])
 
 # b4_yacc_pure_if(IF-TRUE, IF-FALSE)
 # ----------------------------------