init: mark val and str subsystem init functions as constructors

This way, the linker will call them for us before anything can use it.  This
means that we no longer have to call jeffpc_init(NULL) early in the
program's execution if all we want is struct val or struct str.

Signed-off-by: Josef 'Jeff' Sipek <[email protected]>

Author: jeffpc

init.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016 Josef 'Jeff' Sipek <[email protected]>
+ * Copyright (c) 2016-2017 Josef 'Jeff' Sipek <[email protected]>
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -54,8 +54,4 @@ void jeffpc_init(struct jeffpc_ops *ops)
 	SET_OP(log,      default_log);
 	SET_OP(assfail,  default_assfail);
 	SET_OP(assfail3, default_assfail3);
-
-	init_str_subsys();
-	init_val_subsys();
-
 }

init.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016 Josef 'Jeff' Sipek <[email protected]>
+ * Copyright (c) 2016-2017 Josef 'Jeff' Sipek <[email protected]>
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -25,9 +25,6 @@
 
 #include <jeffpc/jeffpc.h>
 
-extern void init_val_subsys(void);
-extern void init_str_subsys(void);
-
 extern struct jeffpc_ops libops;
 
 #endif

str.c

@@ -30,7 +30,7 @@
 
 static struct mem_cache *str_cache;
 
-void init_str_subsys(void)
+static void __attribute__((constructor)) init_str_subsys(void)
 {
 	str_cache = mem_cache_create("str-cache", sizeof(struct str), 0);
 	ASSERT(!IS_ERR(str_cache));

val.c

@@ -58,7 +58,7 @@ static const struct val val_ints[10] = {
 
 static struct mem_cache *val_cache;
 
-void init_val_subsys(void)
+static void __attribute__((constructor)) init_val_subsys(void)
 {
 	val_cache = mem_cache_create("val-cache", sizeof(struct val), 0);
 	ASSERT(!IS_ERR(val_cache));