Changes so that hush can successfully re-execute itself:

*initialize the "environ" variable
*Reduce the stack size to 8192 (This should still be further reduced based on analysis of usage.)

Makefile

@@ -98,7 +98,7 @@ DEFINES += -DF_SETFD=-1 -DFD_CLOEXEC=-1
 # Optimize bit 6 breaks some standard-compliant varargs code,
 # and bits 0, 4, and 5 have known bugs.  Disable for now.
 CFLAGS = -i -w -a0 -O8
-STACKSIZE = 20480
+STACKSIZE = 8192
 
 .IF $(DEBUG)
 CFLAGS += -g -DDEBUG

shell/hush.c

@@ -8034,6 +8034,9 @@ int hush_main(int argc, char **argv)
 
 	INIT_G();
 	hush_exec_path = get_exec_path();
+#ifdef __GNO__
+	environInit();
+#endif
 	if (EXIT_SUCCESS != 0) /* if EXIT_SUCCESS == 0, it is already done */
 		G.last_exitcode = EXIT_SUCCESS;
 #if ENABLE_HUSH_FAST