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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 ```
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@ -54,6 +54,16 @@ $ wasmtime ruby-wasm32-wasi/usr/local/bin/ruby --mapdir /::./ruby-wasm32-wasi/ -
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wasm32-wasi
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```
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Note: you cannot run the built ruby without a WebAssembly runtime, because of the difference of the binary file type.
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```
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$ ruby-wasm32-wasi/usr/local/bin/ruby -e 'puts "a"'
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bash: ruby-wasm32-wasi/usr/local/bin/ruby: cannot execute binary file: Exec format error
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$ file ruby-wasm32-wasi/usr/local/bin/ruby
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ruby-wasm32-wasi/usr/local/bin/ruby: WebAssembly (wasm) binary module version 0x1 (MVP)
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```
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## Current Limitation
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- No `Thread` support for now.
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