https://git.ruby-lang.org/ruby.git/commit/?id=4c554096bf

From 4c554096bfc08939e9eb1fb1773514b62b8b95b5 Mon Sep 17 00:00:00 2001
From: Jun Aruga <jaruga@r...>
Date: Thu, 10 Nov 2022 13:24:27 +0100
Subject: wasm/README.md: Add a note about the Ruby built for wasm. [ci skip]

The Ruby built for wasm cannot be execute without a WebAssembly runtime.

```
$ ruby-wasm32-wasi/usr/local/bin/ruby -e 'puts "a"'
bash: ruby-wasm32-wasi/usr/local/bin/ruby: cannot execute binary file: Exec format error
```

Because the Ruby's file type is different from the one built normally, that is
the `/usr/local/ruby-3.2.0-preview2/bin/ruby` below.

```
$ file ruby-wasm32-wasi/usr/local/bin/ruby
ruby-wasm32-wasi/usr/local/bin/ruby: WebAssembly (wasm) binary module version 0x1 (MVP)

$ file /usr/local/ruby-3.2.0-preview2/bin/ruby
/usr/local/ruby-3.2.0-preview2/bin/ruby: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=a37822085e285c0971159982e7642dda88cea606, for GNU/Linux 3.2.0, with debug_info, not stripped
```
---
 wasm/README.md | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/wasm/README.md b/wasm/README.md
index 050030e514..0f9ca1a3d5 100644
--- a/wasm/README.md
+++ b/wasm/README.md
@@ -54,6 +54,16 @@ $ wasmtime ruby-wasm32-wasi/usr/local/bin/ruby --mapdir /::./ruby-wasm32-wasi/ - https://github.com/ruby/ruby/blob/trunk/wasm/README.md#L54
 wasm32-wasi
 ```
 
+Note: you cannot run the built ruby without a WebAssembly runtime, because of the difference of the binary file type.
+
+```
+$ ruby-wasm32-wasi/usr/local/bin/ruby -e 'puts "a"'
+bash: ruby-wasm32-wasi/usr/local/bin/ruby: cannot execute binary file: Exec format error
+
+$ file ruby-wasm32-wasi/usr/local/bin/ruby
+ruby-wasm32-wasi/usr/local/bin/ruby: WebAssembly (wasm) binary module version 0x1 (MVP)
+```
+
 ## Current Limitation
 
 - No `Thread` support for now.
-- 
cgit v1.2.3


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