[hackers] [scc] Avoid segfault in expand() || Roberto E. Vargas Caballero

[git]

commit 9e4dc8bf34a6c59f7073d95dc7df06d91168d833
Author:     Roberto E. Vargas Caballero <k...@shike2.com>
AuthorDate: Sun Jul 19 09:31:38 2015 +0200
Commit:     Roberto E. Vargas Caballero <k...@shike2.com>
CommitDate: Sun Jul 19 09:31:38 2015 +0200

    Avoid segfault in expand()
    
    The debug fprintf in expect() was using macroname, which was
    not defined in the case of symfile and symline.

diff --git a/cc1/cpp.c b/cc1/cpp.c
index c86002f..f236723 100644
--- a/cc1/cpp.c
+++ b/cc1/cpp.c
@@ -194,6 +194,7 @@ expand(char *begin, Symbol *sym)
        char *s = sym->u.s;
        char *arglist[NR_MACROARG], arguments[INPUTSIZ], buffer[BUFSIZE];
 
+       macroname = sym->name;
        if (sym == symfile) {
                elen = sprintf(buffer, "\"%s\"", input->fname);
                goto substitute;
@@ -203,7 +204,6 @@ expand(char *begin, Symbol *sym)
                goto substitute;
        }
 
-       macroname = sym->name;
        if (!parsepars(arguments, arglist, atoi(s)))
                return 0;
        for (n = 0; n < atoi(s); ++n)