X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/50cce58e9a046f6a98b66cf3907f2668d044df1c..b931235eb9e55277e0147443f916c0f73ad697c4:/data/c.m4

diff --git a/data/c.m4 b/data/c.m4
index f10e0901..46bacfcc 100644
--- a/data/c.m4
+++ b/data/c.m4
@@ -207,6 +207,7 @@ b4_define_flag_if([defines])        # Whether headers are requested.
 b4_define_flag_if([error_verbose])  # Wheter error are verbose.
 b4_define_flag_if([locations])      # Whether locations are tracked.
 b4_define_flag_if([pure])           # Whether the interface is pure.
+b4_define_flag_if([yacc])           # Whether POSIX Yacc is emulated.
 
 
 
@@ -260,9 +261,10 @@ m4_map_sep([     b4_token_enum], [,
 
 # b4_token_enums_defines(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER)
 # -------------------------------------------------------------
-# Output the definition of the tokens (if there are) as enums and #defines.
+# Output the definition of the tokens (if there are any) as enums and, if POSIX
+# Yacc is enabled, as #defines.
 m4_define([b4_token_enums_defines],
-[b4_token_enums($@)b4_token_defines($@)
+[b4_token_enums($@)b4_yacc_if([b4_token_defines($@)], [])
 ])