Is there a way to support both bison 2 and bison 3?

Hi @vlm,

Is there a way to support both bison 2 and bison 3?

For me this fix works well with bison 2.5 and 3.0.2. Only one compiler warning needs to be fixed

  CC       asn1p_y.lo
asn1p_y.y: In function 'asn1p_error':
asn1p_y.y:2465:16: error: unused parameter 'param' [-Werror=unused-parameter]
 yyerror(void **param, const char *msg) {

I workaround it with assert in mouse07410#3 and mouse07410#5

--- a/libasn1parser/asn1p_y.y
+++ b/libasn1parser/asn1p_y.y
@@ -2463,6 +2463,7 @@ _fixup_anonymous_identifier(asn1p_expr_t *expr) {
 
 int
 yyerror(void **param, const char *msg) {
+       assert(param);
        extern char *asn1p_text;
        fprintf(stderr,
                "ASN.1 grammar parse error "

Re workaround: such warnings are typically fixed by casting to void: (void)param; or by using __attribute__((unused)) or the app-specific macro wrapping it, such as GCC_UNUSED for asn1c.

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