* bison.m4: Declare YACC & YFLAGS precious.

[gnulib.git] / m4 / bison.m4

diff --git a/m4/bison.m4 b/m4/bison.m4
index 273b641..bb69123 100644 (file)
--- a/m4/bison.m4
+++ b/m4/bison.m4
@@ -9,5 +9,11 @@ AC_DEFUN([gl_BISON],
 [
   # getdate.y works with bison only.
   : ${YACC='bison -y'}
-  AC_SUBST(YACC)
+  AC_ARG_VAR(YACC,
+[The `Yet Another C Compiler' implementation to use.  Defaults to `bison -y'.
+Values other than `bison -y' will most likely break on most systems.])dnl
+  AC_ARG_VAR(YFLAGS,
+[YFLAGS contains the list arguments that will be passed by default to Bison.
+This script will default YFLAGS to the empty string to avoid a default value of
+`-d' given by some make applications.])dnl
 ])