[hackers] [scc] popctx: fix symbol check, only add to table if sym->name is set || Hiltjo Posthuma

[git]

commit d5065baafed6ee455fc43471085b899d6cf614a0
Author:     Hiltjo Posthuma <hil...@codemadness.org>
AuthorDate: Sat Jul 18 20:02:05 2015 +0200
Commit:     Hiltjo Posthuma <hil...@codemadness.org>
CommitDate: Sat Jul 18 20:02:05 2015 +0200

    popctx: fix symbol check, only add to table if sym->name is set
    
    this crashed (same parameter name), reproduce:
    
    printf '#define t(n) 1\n#define t2(n) 2' | ./cc1

diff --git a/cc1/symbol.c b/cc1/symbol.c
index c8b3487..f609e13 100644
--- a/cc1/symbol.c
+++ b/cc1/symbol.c
@@ -87,7 +87,7 @@ popctx(void)
                        sym->type->defined = 0;
                        break;
                }
-               if (sym->hash)
+               if (sym->name)
                        htab[hash(sym->name)] = sym->hash;
                free(sym->name);
                free(sym);