4 # This macro verifies that Bison is installed. If successful, then
5 # 1) YACC is set to bison -y (to emulate YACC calls)
6 # 2) BISON is set to bison
8 AC_DEFUN([AC_PROG_BISON],
9 [AC_CACHE_CHECK([],[llvm_cv_has_bison],[AC_PROG_YACC()])
10 if test "$YACC" != "bison -y"; then
12 AC_MSG_WARN([bison not found, can't rebuild grammars])
14 AC_SUBST(BISON,[bison])