Question

I’m trying to compile simple expr.y file from NetBSD source tree and when I use bison (GNU Bison) 2.4.2, I’m getting these errors:

expr.y:75.14: syntax error, unexpected =
expr.y:82.29: syntax error, unexpected =

What’s wrong with the file, how it should be fixed?

Answer 1

There are (or have been) some yacc versions out there which accept an = before the {, e.g.

exp:    expr = {
...
    | expr SPEC_OR expr = {

just change all that occurences (in that file not more than ten) to:

exp:    expr {
...
    | expr SPEC_OR expr {