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[driver] Move wait logic to build()

We need this code in build because we have to wait for all the
process before moving to compile the next source.

--- a/driver/posix/scc.c

+++ b/driver/posix/scc.c

@@ -189,6 +189,15 @@

 		spawn(settool(inittool(tool), out));

 		in = tool;

 	}

+	for (i = 0; i < NR_TOOLS; ++i) {

+		if ((pid = tools[i].pid) == 0)

+			continue;

+		if (waitpid(pid, &st, 0) < 0)

+			exit(-1);

+		tools[i].pid = 0;

+		if (!WIFEXITED(st) || WEXITSTATUS(st) != 0)

+			exit(-1);

+	}

 }

 static void

@@ -235,15 +244,6 @@

 		die("scc: fatal error: no input files");

 	build(*argv);

-

-	for (i = 0; i < NR_TOOLS; ++i) {

-		if ((pid = wait(&st)) < 0)

-			break;

-		if (pid == tools[i].pid)

-			tools[i].pid = 0;

-		if (!WIFEXITED(st) || WEXITSTATUS(st) != 0)

-			exit(-1);

-	}

 	return 0;

 }