ci: remove mingw job #18580

Unnecessary CI builds increase the change of spurious failures, which are costly
noise. Of course, we should fix all legitimate bugs, but we also cannot
micro-manage every platform, so there needs to be a clear motivation for the CI
builds that we maintain.

Reasons against maintaining a mingw CI job:
1. The windows mingw build is slow.
2. Failures:
    - https://github.com/neovim/neovim/issues/18494
    - https://github.com/neovim/neovim/issues/18495
3. The mingw artifact is 10x bigger than the windows MSVC artifact:
   https://github.com/neovim/neovim/issues/10560
4. Our releases publish the MSVC (not mingw) artifact for Windows users:
   https://github.com/neovim/neovim/releases
5. Non-MSVCRT has limitations documented by libuv: http://docs.libuv.org/en/v1.x/process.html
   > On Windows file descriptors greater than 2 are available to the child process only if the child processes uses the MSVCRT runtime.

Closes https://github.com/neovim/neovim/issues/18551

1 files changed, 14 insertions, 63 deletions

diff --git a/ci/build.ps1 b/ci/build.ps1
index 533e5804c9..99f66f7de2 100644
--- a/ci/build.ps1
+++ b/ci/build.ps1
@@ -40,55 +40,14 @@ if (-Not (Test-Path -PathType container $env:DEPS_BUILD_DIR)) {
   write-host "cache dir $($env:DEPS_BUILD_DIR) size: $(Get-ChildItem $env:DEPS_BUILD_DIR -recurse | Measure-Object -property length -sum | Select -expand sum)"
 }
 
-if ($compiler -eq 'MINGW') {
-  if ($bits -eq 32) {
-    $arch = 'i686'
-  }
-  elseif ($bits -eq 64) {
-    $arch = 'x86_64'
-  }
-  if ($compileOption -eq 'gcov') {
-    $nvimCmakeVars['USE_GCOV'] = 'ON'
-    $uploadToCodecov = $true
-    $env:GCOV = "C:\msys64\mingw$bits\bin\gcov"
-
-    # Setup/build Lua coverage.
-    $env:USE_LUACOV = 1
-    $env:BUSTED_ARGS = "--coverage"
-  }
-  # These are native MinGW builds, but they use the toolchain inside
-  # MSYS2, this allows using all the dependencies and tools available
-  # in MSYS2, but we cannot build inside the MSYS2 shell.
-  $cmakeGenerator = 'Ninja'
-  $cmakeGeneratorArgs = '-v'
-  $mingwPackages = @('ninja', 'cmake', 'diffutils').ForEach({
-    "mingw-w64-$arch-$_"
-  })
-
-  # Add MinGW to the PATH
-  $env:PATH = "C:\msys64\mingw$bits\bin;$env:PATH"
-
-  # Avoid pacman "warning" which causes non-zero return code. https://github.com/open62541/open62541/issues/2068
-  & C:\msys64\usr\bin\mkdir -p /var/cache/pacman/pkg
-
-  # Build third-party dependencies
-  C:\msys64\usr\bin\bash -lc "pacman --verbose --noconfirm -Syu" ; exitIfFailed
-  # Update again in case updating pacman changes pacman.conf
-  C:\msys64\usr\bin\bash -lc "pacman --verbose --noconfirm -Syu" ; exitIfFailed
-  C:\msys64\usr\bin\bash -lc "pacman --verbose --noconfirm --needed -S $mingwPackages" ; exitIfFailed
-}
-elseif ($compiler -eq 'MSVC') {
-  $cmakeGeneratorArgs = '/verbosity:normal'
-  $cmakeGenerator = 'Visual Studio 16 2019'
-}
-
-if ($compiler -eq 'MSVC') {
-  $installationPath = vswhere.exe -latest -requires Microsoft.VisualStudio.Component.VC.Tools.x86.x64 -property installationPath
-  if ($installationPath -and (test-path "$installationPath\Common7\Tools\vsdevcmd.bat")) {
-    & "${env:COMSPEC}" /s /c "`"$installationPath\Common7\Tools\vsdevcmd.bat`" -arch=x${bits} -no_logo && set" | foreach-object {
-      $name, $value = $_ -split '=', 2
-      set-content env:\"$name" $value
-    }
+$cmakeGeneratorArgs = '/verbosity:normal'
+$cmakeGenerator = 'Visual Studio 16 2019'
+
+$installationPath = vswhere.exe -latest -requires Microsoft.VisualStudio.Component.VC.Tools.x86.x64 -property installationPath
+if ($installationPath -and (test-path "$installationPath\Common7\Tools\vsdevcmd.bat")) {
+  & "${env:COMSPEC}" /s /c "`"$installationPath\Common7\Tools\vsdevcmd.bat`" -arch=x${bits} -no_logo && set" | foreach-object {
+    $name, $value = $_ -split '=', 2
+    set-content env:\"$name" $value
   }
 }
 
@@ -111,14 +70,10 @@ function convertToCmakeArgs($vars) {
 }
 
 cd $env:DEPS_BUILD_DIR
-if ($compiler -eq 'MSVC') {
-  if ($bits -eq 32) {
-    cmake -G $cmakeGenerator -A Win32 $(convertToCmakeArgs($depsCmakeVars)) "$buildDir/third-party/" ; exitIfFailed
-  } else {
-    cmake -G $cmakeGenerator -A x64 $(convertToCmakeArgs($depsCmakeVars)) "$buildDir/third-party/" ; exitIfFailed
-  }
+if ($bits -eq 32) {
+  cmake -G $cmakeGenerator -A Win32 $(convertToCmakeArgs($depsCmakeVars)) "$buildDir/third-party/" ; exitIfFailed
 } else {
-  cmake -G $cmakeGenerator $(convertToCmakeArgs($depsCmakeVars)) "$buildDir/third-party/" ; exitIfFailed
+  cmake -G $cmakeGenerator -A x64 $(convertToCmakeArgs($depsCmakeVars)) "$buildDir/third-party/" ; exitIfFailed
 }
 cmake --build . --config $cmakeBuildType -- $cmakeGeneratorArgs ; exitIfFailed
 cd $buildDir
@@ -126,14 +81,10 @@ cd $buildDir
 # Build Neovim
 mkdir build
 cd build
-if ($compiler -eq 'MSVC') {
-  if ($bits -eq 32) {
-    cmake -G $cmakeGenerator -A Win32 $(convertToCmakeArgs($nvimCmakeVars)) .. ; exitIfFailed
-  } else {
-    cmake -G $cmakeGenerator -A x64 $(convertToCmakeArgs($nvimCmakeVars)) .. ; exitIfFailed
-  }
+if ($bits -eq 32) {
+  cmake -G $cmakeGenerator -A Win32 $(convertToCmakeArgs($nvimCmakeVars)) .. ; exitIfFailed
 } else {
-  cmake -G $cmakeGenerator $(convertToCmakeArgs($nvimCmakeVars)) .. ; exitIfFailed
+  cmake -G $cmakeGenerator -A x64 $(convertToCmakeArgs($nvimCmakeVars)) .. ; exitIfFailed
 }
 cmake --build . --config $cmakeBuildType -- $cmakeGeneratorArgs ; exitIfFailed
 .\bin\nvim --version ; exitIfFailed