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Compiling C to WebAssembly using Clang/LLVM & WASI

These are my notes. See also “[Compiling C to WebAssembly using clang/LLVM and WASI][fda]” by [Frank Denis], which was my starting point.

Assume the following example program in a file called example.c:

#include <stdio.h>

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<#
MIT License

Copyright (c) 2019 Atif Aziz

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is

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<?xml version="1.0" encoding="utf-8"?>
<CodeSnippets xmlns="http://schemas.microsoft.com/VisualStudio/2005/CodeSnippet">
  <CodeSnippet Format="1.0.0">
    <Header>
      <Keywords>
        <Keyword>linq</Keyword>
        <Keyword>extensions</Keyword>
      </Keywords>
      <SnippetTypes>
        <SnippetType>Expansion</SnippetType>

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<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>netcoreapp2.1</TargetFramework>
  </PropertyGroup>

</Project>

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yellow=<DIR>.+$
magenta=<(JUNCTION|SYMLINKD)>.+$
yellow=(?<=<(JUNCTION|SYMLINKD)>.+)\[.+\]$
cyan=(?<=\x20)(?i:[^\x20]+\.(cmd|bat|exe|com|ps1|wsh|wsf|vbs))$
gray=\(([0-9][0-9]?|[0-9][0-9,'.][0-9]*)\)

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#region Copyright (c) 2018 Atif Aziz. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in

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C# Query Expression Pattern

§7.15.3 The query expression pattern, C# Language Specification, Version 3.0

Copyright © Microsoft Corporation 1999-2007. All Rights Reserved.

The Query expression pattern establishes a pattern of methods that

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#region The MIT License (MIT)
//
// Copyright (c) 2018 Atif Aziz. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:

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<Query Kind="Expression">
  <NuGetReference Prerelease="true">morelinq</NuGetReference>
  <Namespace>MoreLinq</Namespace>
  <Namespace>MoreLinq.Experimental</Namespace>
</Query>

Enumerable
    .Range(1, 5)
    .Select(x => TimeSpan.FromSeconds(x))
    .RandomSubset(5)