initial commit

.gitattributes

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+* text=auto

.github/workflows/test.yml

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+name: Test
+
+on:
+  push:
+  pull_request:
+  schedule:
+    # Weekly, at 5:45 AM on Friday (somewhat randomly chosen).
+    - cron: '45 6 * * 5'
+  workflow_dispatch:
+
+jobs:
+  test:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-18.04, windows-2019, windows-2016]
+        platform: [x86, x64]
+
+        include:
+          # Prettier run names.
+          - {os: ubuntu-18.04, name: Ubuntu}
+          - {os: windows-2019, name: Windows Server 2019}
+          - {os: windows-2016, name: Windows Server 2016}
+
+    runs-on: '${{ matrix.os }}'
+
+    name: '${{ matrix.name }} / ${{ matrix.platform }}'
+
+    defaults:
+      run:
+        shell: pwsh
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Set up MinGW
+        id: setup
+        uses: ./
+        with:
+          platform: '${{ matrix.platform }}'
+
+      - name: Build foo.exe
+        run: |
+          & '${{ steps.setup.outputs.gxx }}' -std=c++11 -o foo foo.cpp
+          if ('${{ runner.os }}' -eq 'Windows') {
+              .\foo.exe
+          }

LICENSE.txt

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+MIT License
+
+Copyright (c) 2020 Egor Tensin <[email protected]>
+
+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 all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+Set up MinGW-w64
+================
+
+This is a GitHub action that sets up MinGW-w64 in your workflow run.
+
+1. Installs MinGW-w64 on either Ubuntu or Windows.
+2. Fixes the infamous libwinpthread-1.dll [static linking issue].
+
+[static linking issue]: https://stackoverflow.com/q/13768515/514684
+
+Use it in your workflow like this:
+
+    - name: Set up MinGW
+      uses: egor-tensin/setup-mingw@v1
+      with:
+        platform: x64
+
+`x64` is the default value for the `platform` parameter and can be omitted.
+Use `x86` if you want to build 32-bit binaries.
+
+Set the `cygwin` parameter to `1` to set up MinGW inside an existing Cygwin
+installation (installing Cygwin itself is as simple as `choco install cygwin`).
+
+API
+---
+
+| Input    | Value   | Default | Description
+| -------- | ------- | ------- | -----------
+| platform | x64     | Yes     | Install the x86_64 toolchain.
+|          | *Other* | No      | Install the i686 toolchain.
+| cygwin   | 1       | No      | Install Cygwin packages.
+|          | *Other* | Yes     | Install native binaries.
+| static   | 1       | Yes     | Enable the static-linking workaround.
+|          | *Other* | No      | Disable the static-linking workaround.
+
+| Output  | Example                  | Description
+| ------- | ------------------------ | -----------
+| prefix  | x86_64-w64-mingw32       | Cross-compilation toolchain prefix
+| gcc     | x86_64-w64-mingw32-gcc   | gcc binary name
+| gxx     | i686-w64-mingw32-g++     | g++ binary name
+| windres | i686-w64-mingw32-windres | windres binary name
+
+License
+-------
+
+Distributed under the MIT License.
+See [LICENSE.txt] for details.
+
+[LICENSE.txt]: LICENSE.txt

action.yml

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+name: Install MinGW
+description: Install MinGW-w64
+
+inputs:
+  platform:
+    description: Target platform
+    required: false
+    default: x64
+  cygwin:
+    description: Install inside Cygwin
+    required: false
+    default: 0
+  static:
+    description: Enable static linking workaround
+    required: False
+    default: 1
+
+outputs:
+  prefix:
+    description: Cross-compilation toolchain prefix
+    value: '${{ steps.setup.outputs.prefix }}'
+  gcc:
+    description: gcc binary name
+    value: '${{ steps.setup.outputs.gcc }}'
+  gxx:
+    description: g++ binary name
+    value: '${{ steps.setup.outputs.gxx }}'
+  windres:
+    description: windres binary name
+    value: '${{ steps.setup.outputs.windres }}'
+
+runs:
+  using: composite
+  steps:
+    - id: setup
+      run: |
+        $x64 = '${{ inputs.platform }}' -eq 'x64'
+        $cygwin = '${{ inputs.cygwin }}' -eq '1'
+        $static_workaround = '${{ inputs.static }}' -eq '1'
+
+        $prefix32 = 'i686-w64-mingw32'
+        $prefix64 = 'x86_64-w64-mingw32'
+        $prefix = if ($x64) { $prefix64 } else { $prefix32 }
+
+        if ('${{ runner.os }}' -eq 'Linux') {
+            # -------------------------------------------------------------
+            # Ubuntu
+            # -------------------------------------------------------------
+            sudo apt install mingw-w64
+
+            # Make the compilers use the POSIX threading model, whatever that
+            # is.  Without it, the stuff from <mutex>/<thread>/etc. doesn't
+            # compile.  Of course, it makes the binaries depend on
+            # libwinpthread-1.dll, but what you gonna do?
+
+            sudo update-alternatives --set "$prefix32-gcc" "/usr/bin/$prefix32-gcc-posix"
+            sudo update-alternatives --set "$prefix32-g++" "/usr/bin/$prefix32-g++-posix"
+            sudo update-alternatives --set "$prefix64-gcc" "/usr/bin/$prefix64-gcc-posix"
+            sudo update-alternatives --set "$prefix64-g++" "/usr/bin/$prefix64-g++-posix"
+
+            if ($static_workaround) {
+                sudo rm `
+                    "/usr/$prefix32/lib/libpthread.dll.a" `
+                    "/usr/$prefix32/lib/libwinpthread.dll.a" `
+                    "/usr/$prefix64/lib/libpthread.dll.a" `
+                    "/usr/$prefix64/lib/libwinpthread.dll.a"
+            }
+        } elseif ('${{ runner.os }}' -eq 'Windows') {
+            if ($cygwin) {
+                # -------------------------------------------------------------
+                # Cygwin
+                # -------------------------------------------------------------
+                $cygwin_pkg = if ($x64) { 'mingw64-x86_64-gcc-g++' } else { 'mingw64-i686-gcc-g++' }
+                choco.exe install -y --no-progress --source=cygwin $cygwin_pkg
+
+                if ($static_workaround) {
+                    $cygwin_lib = Join-Path C: tools cygwin usr $prefix sys-root mingw lib
+                    Remove-Item (Join-Path $cygwin_lib 'libpthread.dll.a')
+                    Remove-Item (Join-Path $cygwin_lib 'libwinpthread.dll.a')
+                }
+            } else {
+                # -------------------------------------------------------------
+                # Windows
+                # -------------------------------------------------------------
+                $mingw32 = 'mingw32'
+                $mingw64 = 'mingw64'
+                $mingw = if ($x64) { $mingw64 } else { $mingw32 }
+
+                $mingw_install = Join-Path C: ProgramData chocolatey lib mingw tools install
+
+                $mingw32_root = Join-Path $mingw_install $mingw32
+                $mingw64_root = Join-Path $mingw_install $mingw64
+                $mingw_root = Join-Path $mingw_install $mingw
+
+                $mingw32_bin = Join-Path $mingw32_root bin
+                $mingw64_bin = Join-Path $mingw64_root bin
+                $mingw_bin = Join-Path $mingw_root bin
+
+                $mingw_lib = Join-Path $mingw_root $prefix lib
+
+                if ($x64) {
+                    # Assuming the 64-bit version is installed.  If 32-bit
+                    # version is installed, we won't detect that.  But it's not
+                    # _that_ important, and we save a lot of time.
+                    choco.exe install -y --no-progress mingw
+                    echo $mingw64_bin >> $env:GITHUB_PATH
+                } else {
+                    # Assuming the 64-bit version is installed.
+                    choco.exe uninstall -y --no-progress mingw
+                    choco.exe install -y --no-progress --x86 mingw
+                    echo $mingw32_bin >> $env:GITHUB_PATH
+                }
+
+                if ($static_workaround) {
+                    Remove-Item (Join-Path $mingw_lib 'libpthread.dll.a')
+                    Remove-Item (Join-Path $mingw_lib 'libwinpthread.dll.a')
+                }
+            }
+        }
+
+        $gcc = $prefix + '-gcc'
+        $gxx = $prefix + '-g++'
+        $windres = $prefix = '-windres'
+
+        echo "::set-output name=prefix::$prefix"
+        echo "::set-output name=gcc::$gcc"
+        echo "::set-output name=gxx::$gxx"
+        echo "::set-output name=windres::$windres"
+      shell: pwsh
+
+branding:
+  icon: star
+  color: green

foo.cpp

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+#include <array>
+#include <cstddef>
+#include <exception>
+#include <functional>
+#include <iostream>
+#include <mutex>
+#include <thread>
+
+namespace {
+
+struct Counter {
+    std::mutex mtx;
+    std::size_t impl = 0;
+};
+
+void do_something(Counter& counter) {
+    std::lock_guard<std::mutex> lck{counter.mtx};
+    ++counter.impl;
+    std::cout << "Doing something #" << counter.impl << '\n';
+}
+
+}
+
+int main() {
+    try {
+        Counter counter;
+        std::array<std::thread, 3> workers;
+        for (auto& worker : workers) {
+            worker = std::thread{&do_something, std::ref(counter)};
+        }
+        for (auto& worker : workers) {
+            worker.join();
+        }
+    } catch (const std::exception& e) {
+        std::cerr << e.what() << '\n';
+        return 1;
+    }
+    return 0;
+}