[hackers] [scc] [driver] update usage, exit when exclusive flags given || Quentin Rameau

[git]

commit d61e762f242feac5d89b935b9bf591d0daf986d3
Author:     Quentin Rameau <quinq@fifth.space>
AuthorDate: Wed Jun 1 19:51:04 2016 +0200
Commit:     Quentin Rameau <quinq@fifth.space>
CommitDate: Wed Jun 1 19:52:56 2016 +0200

    [driver] update usage, exit when exclusive flags given

diff --git a/driver/posix/scc.c b/driver/posix/scc.c
index 9d21684..d288fe3 100644
--- a/driver/posix/scc.c
+++ b/driver/posix/scc.c
@@ -194,7 +194,7 @@ build(char *file)
 static void
 usage(void)
 {
-       die("usage: %s [-m arch] input ...");
+       die("usage: %s [-E|-kS] [-m arch] input ...", argv0);
 }
 
 int
@@ -228,6 +228,9 @@ main(int argc, char *argv[])
                usage();
        } ARGEND
 
+       if (Eflag && (Sflag || kflag))
+               usage();
+
        if (!argc)
                die("scc: fatal error: no input files");