drop Cygwin, it's obsolete

9 files changed, 11 insertions, 149 deletions

diff --git a/.github/actions/build-boost/action.yml b/.github/actions/build-boost/action.yml
index 2a47ea4..fdd4fdc 100644
--- a/.github/actions/build-boost/action.yml
+++ b/.github/actions/build-boost/action.yml
@@ -36,11 +36,6 @@ runs:
             Remove-Variable libraries
         }
 
-        if ($env:CI_HOST_CYGWIN) {
-            $python = 'python3'
-            $boost_dir = cygpath.exe -ua $boost_dir
-        }
-
         & $python `
             -m project.boost.build `
             --toolset '${{ inputs.toolset }}' `
diff --git a/.github/actions/build-example/action.yml b/.github/actions/build-example/action.yml
index 8d684c1..7a77582 100644
--- a/.github/actions/build-example/action.yml
+++ b/.github/actions/build-example/action.yml
@@ -42,15 +42,6 @@ runs:
         $install_dir = '${{ steps.install-dir.outputs.path }}'
         $boost_dir = '${{ inputs.boost-dir }}'
 
-        if ($env:CI_HOST_CYGWIN) {
-            $python = 'python3'
-            $src_dir = cygpath.exe -ua $src_dir
-            $install_dir = cygpath.exe -ua $install_dir
-            if ($boost_dir) {
-                $boost_dir = cygpath.exe -ua $boost_dir
-            }
-        }
-
         $args = @(
             '--install',
             $install_dir,
diff --git a/.github/actions/check-boost-bootstrapped/action.yml b/.github/actions/check-boost-bootstrapped/action.yml
index cd901cc..fa96575 100644
--- a/.github/actions/check-boost-bootstrapped/action.yml
+++ b/.github/actions/check-boost-bootstrapped/action.yml
@@ -32,9 +32,7 @@ runs:
 
         $exists_plain = Test-Path $path -Type Leaf
         $exists_exe = Test-Path "${path}.exe" -Type Leaf
-        $exists = if ($env:CI_HOST_CYGWIN) {
-            $exists_plain -or $exists_exe
-        } elseif ($env:CI_HOST_WINDOWS) {
+        $exists = if ($env:CI_HOST_WINDOWS) {
             $exists_exe
         } else {
             $exists_plain
diff --git a/.github/actions/check-runtime-library/action.yml b/.github/actions/check-runtime-library/action.yml
index 32d2246..a112687 100644
--- a/.github/actions/check-runtime-library/action.yml
+++ b/.github/actions/check-runtime-library/action.yml
@@ -130,16 +130,9 @@ runs:
                     $windows_forbidden = @()
                 }
             }
-            # Linking libstdc++ statically on Cygwin is broken, see the
-            # cygwin_static_libstdc++.yml workflow.
-            $cygwin_forbidden = @('msvcrt.dll')
             $linux_forbidden = @()
 
-            if ($env:CI_TARGET_CYGWIN) {
-                Do-ValidateLinkedLibraries `
-                    -Actual $Actual `
-                    -Forbidden $cygwin_forbidden
-            } elseif ($env:CI_TARGET_WINDOWS) {
+            if ($env:CI_TARGET_WINDOWS) {
                 Do-ValidateLinkedLibraries `
                     -Actual $Actual `
                     -Forbidden $windows_forbidden
diff --git a/.github/actions/common-variables/action.yml b/.github/actions/common-variables/action.yml
index 3d40cdd..3b197da 100644
--- a/.github/actions/common-variables/action.yml
+++ b/.github/actions/common-variables/action.yml
@@ -4,30 +4,23 @@ inputs:
   toolset:
     description: Toolset used
     required: true
-  cygwin:
-    description: Targeting Cygwin
-    required: false
-    default: 0
 runs:
   using: composite
   steps:
     - run: |
         New-Variable toolset -Value '${{ inputs.toolset }}' -Option Constant
-        New-Variable cygwin -Value ('${{ inputs.cygwin }}' -eq '1') -Option Constant
 
         New-Variable os -Value '${{ runner.os }}' -Option Constant
 
         New-Variable host_linux -Value ($os -eq 'Linux') -Option Constant
-        New-Variable host_cygwin -Value $cygwin -Option Constant
-        New-Variable host_windows -Value ($os -eq 'Windows' -and !$host_cygwin) -Option Constant
+        New-Variable host_windows -Value ($os -eq 'Windows') -Option Constant
 
         New-Variable mingw -Value ($toolset -eq 'mingw' -or ($host_windows -and $toolset -eq 'gcc')) -Option Constant
 
         New-Variable target_linux -Value ($host_linux -and !$mingw) -Option Constant
-        New-Variable target_cygwin -Value ($host_cygwin -and !$mingw) -Option Constant
         New-Variable target_windows -Value ($mingw -or $host_windows) -Option Constant
 
-        New-Variable target_pe -Value ($target_windows -or $target_cygwin) -Option Constant
+        New-Variable target_pe -Value $target_windows -Option Constant
         New-Variable target_elf -Value $target_linux -Option Constant
 
         function Set-BoolVar {
@@ -57,11 +50,9 @@ runs:
         }
 
         Set-BoolVar 'CI_HOST_LINUX' $host_linux
-        Set-BoolVar 'CI_HOST_CYGWIN' $host_cygwin
         Set-BoolVar 'CI_HOST_WINDOWS' $host_windows
         Set-BoolVar 'CI_MINGW' $mingw
         Set-BoolVar 'CI_TARGET_LINUX' $target_linux
-        Set-BoolVar 'CI_TARGET_CYGWIN' $target_cygwin
         Set-BoolVar 'CI_TARGET_WINDOWS' $target_windows
 
         Set-BoolVar 'CI_TARGET_PE' $target_pe
@@ -70,8 +61,8 @@ runs:
         $lib_prefix = 'lib'
         $lib_ext = if ($target_windows -and -not $mingw) { '.lib' } else { '.a' }
 
-        $dll_prefix = if ($target_windows -and -not $mingw) { '' } elseif ($target_cygwin) { 'cyg' } else { 'lib' }
-        $dll_ext = if ($target_windows -or $target_cygwin) { '.dll' } else { '.so' }
+        $dll_prefix = if ($target_windows -and -not $mingw) { '' } else { 'lib' }
+        $dll_ext = if ($target_windows) { '.dll' } else { '.so' }
 
         $exe_ext = if ($target_pe) { '.exe' } else { '' }
 
diff --git a/.github/actions/download-boost/action.yml b/.github/actions/download-boost/action.yml
index 7e15075..05f6bf3 100644
--- a/.github/actions/download-boost/action.yml
+++ b/.github/actions/download-boost/action.yml
@@ -42,10 +42,5 @@ runs:
             $args += '--no-retry'
         }
 
-        if ($env:CI_HOST_CYGWIN) {
-            $python = 'python3'
-            $cache_dir = cygpath.exe -ua $cache_dir
-        }
-
         & $python -m project.boost.download --cache $cache_dir $args -- $env:BOOST_VERSION
       shell: pwsh
diff --git a/.github/actions/run-example-boost/action.yml b/.github/actions/run-example-boost/action.yml
index 0dd9f44..0fd05ed 100644
--- a/.github/actions/run-example-boost/action.yml
+++ b/.github/actions/run-example-boost/action.yml
@@ -19,23 +19,14 @@ runs:
         $absolute_test = Join-Path (Get-Location).Path 'test.txt'
 
         $exe_path = (Join-Path $path 'bin' 'foo')
-        if (-not $env:CI_TARGET_CYGWIN) {
-            $exe_path += $env:CI_EXE_EXT
-        }
-
-        $argv0 = $exe_path
-        if ($env:CI_TARGET_CYGWIN) {
-            # Apparently, Cygwin programs convert argv[0] when executing native
-            # programs or being executed by them.
-            $argv0 = cygpath.exe -ua $argv0
-        }
+        $exe_path += $env:CI_EXE_EXT
 
         $actual = & $exe_path $relative_test
 
         echo 'Actual output:'
         echo $actual
 
-        $expected = $argv0,$absolute_test
+        $expected = $exe_path,$absolute_test
         echo 'Expected output:'
         echo $expected
 
diff --git a/.github/actions/software-environment/action.yml b/.github/actions/software-environment/action.yml
index 872449d..9dd1486 100644
--- a/.github/actions/software-environment/action.yml
+++ b/.github/actions/software-environment/action.yml
@@ -26,9 +26,7 @@ runs:
         function Print-Info {
             param(
                 [Parameter(Mandatory=$true)]
-                [string] $name,
-                [Parameter()]
-                [string] $exe
+                [string] $name
             )
 
             echo ''
@@ -36,11 +34,7 @@ runs:
             echo $name
             echo '------------------------------------------------------------'
 
-            if (!$exe) {
-                $exe = $name
-            }
-
-            $full_path = Get-Command $exe -ErrorAction SilentlyContinue
+            $full_path = Get-Command $name -ErrorAction SilentlyContinue
             if ($full_path) {
                 $full_path = $full_path.Path
                 echo "Location: $full_path"
@@ -51,12 +45,7 @@ runs:
             }
         }
 
-        $python = 'python'
-        if ($env:CI_HOST_CYGWIN) {
-            $python = 'python3'
-        }
-
-        Print-Info 'python' $python
+        Print-Info 'python'
         Print-Info 'cmake'
         Print-Info 'make'
         Print-Info 'mingw32-make'
diff --git a/.github/workflows/cygwin_static_libstdc++.yml b/.github/workflows/cygwin_static_libstdc++.yml
deleted file mode 100644
index aa5631d..0000000
--- a/.github/workflows/cygwin_static_libstdc++.yml
+++ /dev/null
@@ -1,81 +0,0 @@
-# -static-libstdc++ is broken on Cygwin for some reason, as this workflow tries
-# to demonstrate.  I don't know why exactly, but I'm not the only one with this
-# problem:
-#
-#   * https://stackoverflow.com/q/46854365/514684
-#   * https://sourceforge.net/p/stlplus/discussion/345536/thread/48c7fc9c17/?limit=25
-
-name: Cygwin & -static-libstdc++
-
-on:
-  #push:
-  #pull_request:
-  schedule:
-    # Weekly, at 5:30 AM on Saturday (somewhat randomly chosen).
-    - cron: '30 5 * * 6'
-  workflow_dispatch:
-
-jobs:
-  test:
-    runs-on: windows-latest
-
-    name: Test
-
-    defaults:
-      run:
-        shell: pwsh
-
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v3
-
-      - name: Clean up PATH
-        uses: egor-tensin/cleanup-path@v3
-        if: runner.os == 'Windows'
-
-      - name: Set common variables
-        uses: ./.github/actions/common-variables
-        with:
-          toolset: gcc
-          cygwin: 1
-
-      - name: Install Cygwin
-        uses: egor-tensin/setup-cygwin@v3
-
-      - name: Install GCC
-        uses: egor-tensin/setup-gcc@v1
-        with:
-          cygwin: 1
-
-      - name: Set up software environment
-        uses: ./.github/actions/software-environment
-        with:
-          toolset: gcc
-
-      - name: test.cpp
-        run: |
-          $src = @"
-          #include <stdexcept>
-
-          int main() {
-              std::runtime_error x{"x"};
-              std::runtime_error y{x};
-              return 0;
-          }
-          "@
-
-          echo $src > test.cpp
-
-      - name: Build w/ -static-libstdc++
-        run: C:\tools\cygwin\bin\g++.exe -static-libstdc++ -o test test.cpp
-        continue-on-error: true
-
-      - name: Should fail
-        run: $(Test-Path test.exe -Type Leaf) -and $(throw "test.exe shouldn't have been built")
-
-      - name: Build w/ --allow-multiple-definition
-        run: C:\tools\cygwin\bin\g++.exe '-Wl,--allow-multiple-definition' -static-libstdc++ -o test test.cpp
-        continue-on-error: true
-
-      - name: Should succeed
-        run: $(Test-Path test.exe -Type Leaf) -or $(throw "test.exe should have been built")