Feature: self hosting prototype implemented

This is a large change. In order to remove myself from libc's arcane
interface, I implemented an independent runtime layer. It is based on
musl's wonderful implementation mostly. Critically, if libc is linked to
the program, then we cooperate. Namely, we call start main and let libc
do all initialization. If not, then we have a noop defined in rt3.a.

The general structure of the file is:
1. sys/$os/$arch contains all architecture dependent code
2. sys/$os/port contains all code that depends on the os, but is
   portable
3. rt/$arch contains all the runtime architecture dependent code
4. rt/* contains the portable runtime code.

Obviously testing is needed. Specifically, while code is checked in for
the most popular architectures, it only has been tested on one computer!
Overall this is exciting and as been educational.

5 files changed, 11 insertions, 12 deletions

diff --git a/src/base/coro/rules.mk b/src/base/coro/rules.mk
index c2ee89f..d23bfd0 100644
--- a/src/base/coro/rules.mk
+++ b/src/base/coro/rules.mk
@@ -1,3 +1,3 @@
-SRCS_$(d)+=\
-	$(d)/coro/coro.c\
-	$(d)/coro/unix_x64.s\
+# SRCS_$(d)+=\
+# 	$(d)/coro/coro.c\
+# 	$(d)/coro/unix_x64.s\
diff --git a/src/base/flate/internal.h b/src/base/flate/internal.h
index 794c7c2..a926ed7 100644
--- a/src/base/flate/internal.h
+++ b/src/base/flate/internal.h
@@ -3,7 +3,7 @@
 #include <u.h>
 #include <base.h>
 
-#include <zlib.h>
+#include <vendor/zlib.h>
 
 typedef struct buffer
 {
diff --git a/src/base/gz/internal.h b/src/base/gz/internal.h
index 6a268c4..0e71db0 100644
--- a/src/base/gz/internal.h
+++ b/src/base/gz/internal.h
@@ -2,5 +2,4 @@
 
 #include <u.h>
 #include <base.h>
-
-#include <zlib.h>
+#include <vendor/zlib.h>
diff --git a/src/libfmt/do.c b/src/libfmt/do.c
index eaac0a3..bd2e65c 100644
--- a/src/libfmt/do.c
+++ b/src/libfmt/do.c
@@ -1,10 +1,8 @@
 #include "internal.h"
-#include <stdatomic.h>
+#include <arch/atomic.h>
 
-#define atomic _Atomic
 #define MaxFmt 128
-#define atomic·load  atomic_load
-#define atomic·store atomic_store
+#define atomic·load(p) (*(p))
 
 // -----------------------------------------------------------------------
 // globals
@@ -25,11 +23,11 @@ static int badfmt(fmt·State *);
 
 static struct
 {
-    atomic int len;
+    volatile int len;
     Verb verb[MaxFmt];
 } formatter =
 {
-    ATOMIC_VAR_INIT(30),
+    30,
     {
         {' ', fmtflag},
         {'#', fmtflag},
diff --git a/src/libutf/vendor/mkrunetype.c b/src/libutf/vendor/mkrunetype.c
index 9f939f4..b33df32 100644
--- a/src/libutf/vendor/mkrunetype.c
+++ b/src/libutf/vendor/mkrunetype.c
@@ -385,4 +385,6 @@ main(int argc, char *argv[])
     mkto("upper", table.toupper, 1, 0);
     mkto("lower", table.tolower, 1, 0);
     mkto("title", table.totitle, 1, 0);
+
+	return 0;
 }