From 0352f927e1dfbdb2e137bce55a288910554de3fc Mon Sep 17 00:00:00 2001
From: Zhuowei Zhang <zhuoweizhang@yahoo.com>
Date: Sat, 4 Jul 2020 13:53:51 -0400
Subject: [PATCH] AsMain/main.s: align to 4 byte boundary

ARM instructions must be aligned to 4 bytes.
Without this directive, ld complains:

```
ld: warning: arm64 function not 4-byte aligned: _main from HelloWorld.o
ld: warning: arm64 function not 4-byte aligned: helloworld from HelloWorld.o
```

Clang uses the .p2align directive to ensure this; you can see it if you run:

```
clang -S -Os -c -target arm64-apple-macos test.c
```
---
 AsMain/main.s | 1 +
 1 file changed, 1 insertion(+)

diff --git a/AsMain/main.s b/AsMain/main.s
index 3cb480c..39b7fb0 100644
--- a/AsMain/main.s
+++ b/AsMain/main.s
@@ -7,6 +7,7 @@
 //
 
 .global _main	            // Provide program starting address to linker
+.p2align 2                  // align _main to 4 byte boundary
 
 // Setup the parameters to print hello world
 // and then call Linux to do it.