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#
# Check for Bison.
#
# This macro verifies that Bison is installed. If successful, then
# 1) YACC is set to bison -y (to emulate YACC calls)
# 2) BISON is set to bison
#
AC_DEFUN([AC_PROG_BISON],
[AC_CACHE_CHECK([],[llvm_cv_has_bison],
[AC_PROG_YACC()
])
if test "$YACC" != "bison -y"; then
AC_MSG_ERROR([bison not found but required])
else
AC_SUBST(BISON,[bison],[location of bison])
fi
])
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