[hackers] [scc] Use assign() to parse va_start last arg symbol || Michael Forney

[git]

commit 3e63b3f608ae6c6732758f6c55e316c3e341abde
Author:     Michael Forney <mfor...@mforney.org>
AuthorDate: Wed Feb 15 23:30:16 2017 -0800
Commit:     Roberto E. Vargas Caballero <k...@shike2.com>
CommitDate: Thu Feb 16 08:44:49 2017 +0100

    Use assign() to parse va_start last arg symbol

diff --git a/cc1/builtin.c b/cc1/builtin.c
index 7768df1..2361151 100644
--- a/cc1/builtin.c
+++ b/cc1/builtin.c
@@ -58,21 +58,19 @@ static Node *
 builtin_va_start(Symbol *sym)
 {
        Node *np, *ap, *last;
-       Symbol **p, *lastsym;
+       Symbol **p;
        Type *tp;
 
        ap = assign();
        expect(',');
-       if (yytoken != IDEN)
+       last = assign();
+       if (last->op != OSYM)
                goto error;
-       lastsym = yylval.sym;
-       last = varnode(lastsym);
-       next();
 
-       if (!valid_va_list(ap->type) || !(lastsym->flags&SDECLARED))
+       if (!valid_va_list(ap->type) || !(last->sym->flags&SDECLARED))
                 goto error;
 
-       for (p = curfun->u.pars; p && *p != lastsym; ++p)
+       for (p = curfun->u.pars; p && *p != last->sym; ++p)
                /* nothing */;
        if (!p || *p == NULL || p[1] == NULL || p[1]->type != ellipsistype)
                warn("second parameter of 'va_start' not last named argument");