.github/actions/build-foo-cygwin/action.yml

@@ -1,5 +1,9 @@
 name: Build foo.exe
 description: Build foo.exe (on Cygwin)
+inputs:
+  platform:
+    description: Target platform
+    required: true
 runs:
   using: composite
   steps:
@@ -10,6 +14,7 @@ runs:
         echo "$src_dir"
         src_dir="$( cygpath -ua "$src_dir" )"
         cd -- "$src_dir"
-        clang++ --version
-        clang++ -std=c++14 -o foo.exe foo.cpp
+        arch=
+        [ '${{ matrix.platform }}' == 'x86' ] && arch=-m32
+        clang++ $arch -std=c++14 -o foo.exe foo.cpp
       shell: C:\tools\cygwin\bin\bash.exe --login --norc -eo pipefail -o igncr '{0}'

.github/actions/build-foo/action.yml

@@ -1,10 +1,9 @@
 name: Build foo.exe
 description: Build foo.exe
 inputs:
-  binary:
-    description: Compiler binary file name
+  version:
+    description: Version to use
     required: false
-    default: clang++
   platform:
     description: Target platform
     required: true
@@ -24,5 +23,5 @@ runs:
             $flags += '-lpthread'
         }
 
-        & '${{ inputs.binary }}' $flags
+        & "clang++$version" $flags
       shell: pwsh

.github/actions/check-cc-cygwin/action.yml

@@ -1,5 +1,5 @@
-name: Check symlinks
-description: Check symlinks (on Cygwin)
+name: Check cc/c++
+description: Check cc/c++ (on Cygwin)
 runs:
   using: composite
   steps:

.github/actions/check-cc/action.yml

@@ -1,5 +1,5 @@
-name: Check symlinks
-description: Check symlinks
+name: Check cc/c++
+description: Check cc/c++
 inputs:
   version:
     description: Specific version to check
@@ -28,7 +28,5 @@ runs:
         }
 
         Check-Exe cc
-        Check-Exe clang
         Check-Exe c++
-        Check-Exe clang++
       shell: pwsh

.github/workflows/test.yml

@@ -13,14 +13,14 @@ jobs:
     strategy:
       matrix:
         platform: [x86, x64]
-        os: [ubuntu-18.04, ubuntu-20.04, ubuntu-22.04, windows-2019, windows-2022]
+        os: [ubuntu-18.04, ubuntu-20.04, ubuntu-latest, windows-2016, windows-2019, windows-latest]
     runs-on: '${{ matrix.os }}'
     name: 'Test: ${{ matrix.os }} / ${{ matrix.platform }}'
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v2
       - name: Clean up PATH
-        uses: egor-tensin/cleanup-path@v3
+        uses: egor-tensin/cleanup-path@v1
         if: runner.os == 'Windows'
       - name: Set up Clang
         uses: ./
@@ -31,38 +31,24 @@ jobs:
         uses: ./.github/actions/build-foo
       - name: Run foo.exe
         uses: ./.github/actions/run-foo
-      - name: Check symlinks
+      - name: Check cc/c++
         uses: ./.github/actions/check-cc
 
   versions:
     strategy:
       matrix:
-        os: [ubuntu-18.04, ubuntu-20.04, ubuntu-22.04]
-        version: ['3.9', '4.0', 4, '5.0', 5, '6.0', 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]
+        os: [ubuntu-18.04, ubuntu-20.04]
+        version: ['3.9', '4.0', '5.0', '6.0', 7, 8, 9, 10, 11, 12]
         exclude:
           - {os: ubuntu-20.04, version: '3.9'}
           - {os: ubuntu-20.04, version: '4.0'}
-          - {os: ubuntu-20.04, version: 4}
           - {os: ubuntu-20.04, version: '5.0'}
-          - {os: ubuntu-20.04, version: 5}
-          - {os: ubuntu-22.04, version: '3.9'}
-          - {os: ubuntu-22.04, version: '4.0'}
-          - {os: ubuntu-22.04, version: 4}
-          - {os: ubuntu-22.04, version: '5.0'}
-          - {os: ubuntu-22.04, version: 5}
-          - {os: ubuntu-22.04, version: '6.0'}
-          - {os: ubuntu-22.04, version: 6}
-          - {os: ubuntu-22.04, version: 7}
-          - {os: ubuntu-22.04, version: 8}
-          - {os: ubuntu-22.04, version: 9}
-          - {os: ubuntu-22.04, version: 10}
     runs-on: '${{ matrix.os }}'
     name: 'Version: ${{ matrix.os }} / ${{ matrix.version }}'
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
-      - id: setup
-        name: Set up Clang
+        uses: actions/checkout@v2
+      - name: Set up Clang
         uses: ./
         with:
           version: '${{ matrix.version }}'
@@ -71,10 +57,10 @@ jobs:
       - name: Build foo.exe
         uses: ./.github/actions/build-foo
         with:
-          binary: '${{ steps.setup.outputs.clangxx }}'
+          version: '${{ matrix.version }}'
       - name: Run foo.exe
         uses: ./.github/actions/run-foo
-      - name: Check symlinks
+      - name: Check cc/c++
         uses: ./.github/actions/check-cc
         with:
           version: '${{ matrix.version }}'
@@ -82,22 +68,23 @@ jobs:
   cygwin:
     strategy:
       matrix:
+        platform: [x86, x64]
         hardlinks: [0, 1]
     runs-on: windows-latest
-    name: 'Cygwin: hardlinks${{ matrix.hardlinks }}'
-    # As of January 2023, clang simply doesn't work on Cygwin.
-    # It's also marked "Unmaintained" in the installer.
-    continue-on-error: true
+    name: 'Cygwin: ${{ matrix.platform }} / hardlinks${{ matrix.hardlinks }}'
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v2
       - name: Clean up PATH
-        uses: egor-tensin/cleanup-path@v3
+        uses: egor-tensin/cleanup-path@v1
       - name: Install Cygwin
-        uses: egor-tensin/setup-cygwin@v4
+        uses: egor-tensin/setup-cygwin@v3
+        with:
+          platform: '${{ matrix.platform }}'
       - name: Set up Clang
         uses: ./
         with:
+          platform: '${{ matrix.platform }}'
           cygwin: 1
           cc: 1
           hardlinks: '${{ matrix.hardlinks }}'
@@ -109,9 +96,9 @@ jobs:
         if: '!matrix.hardlinks'
       - name: Run foo.exe
         uses: ./.github/actions/run-foo
-      - name: Check symlinks
+      - name: Check cc/c++
         uses: ./.github/actions/check-cc
         if: matrix.hardlinks
-      - name: Check symlinks
+      - name: Check cc/c++ on Cygwin
         uses: ./.github/actions/check-cc-cygwin
         if: '!matrix.hardlinks'

README.md

@@ -39,16 +39,11 @@ API
 |           | *any*   |         | Install the i686 toolchain.
 | cygwin    | *any*   | ✓       | Install native binaries.
 |           | 1       |         | Install Cygwin packages.
-| cc        | 1       | ✓       | Set up `cc`/`clang`/`c++`/`clang++` executables.
-|           | *any*   |         | Don't set up the executables.
+| cc        | 1       | ✓       | Set up `cc`/`c++` executables.
+|           | *any*   |         | Don't set up `cc`/`c++`.
 | hardlinks | *any*   | ✓       | Cygwin: don't convert any symlinks.
 |           | 1       |         | Cygwin: convert symlinks in /usr/bin to hardlinks.
 
-| Output  | Example   | Description
-| ------- | --------- | -----------
-| clang   | clang-4.0 | `clang` binary name
-| clangxx | clang++-7 | `clang++` binary name
-
 Supported versions
 ------------------
 
@@ -61,26 +56,24 @@ The `version` parameter value is not checked for being an available version for
 the current distribution.
 The supported versions for a particular distribution are those found in that
 distro's repositories & those in the LLVM repository.
-For example, you can find the list of available versions as of January 2023
-below.
+For example, the supported versions for Bionic & Focal as of July 2021 are
+listed below.
 
-| `version` | Bionic | Focal | Jammy
-| --------- | ------ | ----- | -----
-| 3.9       | ✓      |       |
-| 4.0       | ✓      |       |
-| 5.0       | ✓      |       |
-| 6.0       | ✓      | ✓     |
-| 7         | ✓      | ✓     |
-| 8         | ✓      | ✓     |
-| 9         | ✓      | ✓     |
-| 10        | ✓      | ✓     |
-| 11        | ✓      | ✓     | ✓
-| 12        | ✓      | ✓     | ✓
-| 13        | ✓      | ✓     | ✓
-| 14        | ✓      | ✓     | ✓
-| 15        | ✓      | ✓     | ✓
+| `version` | Bionic | Focal
+| --------- | ------ | -----
+| 3.9       | ✓      |
+| 4.0       | ✓      |
+| 5.0       | ✓      |
+| 6.0       | ✓      | ✓
+| 7         | ✓      | ✓
+| 8         | ✓      | ✓
+| 9         | ✓      | ✓
+| 10        | ✓      | ✓
+| 11        | ✓      | ✓
+| 12        | ✓      | ✓
 
-This table should be updated periodically; it's a work-in-progress.
+This table is not definitive; I expect more future versions to be made
+available, especially for Focal.
 
 On Windows and Cygwin, the `version` parameter is ignored.
 

action.yml

@@ -15,7 +15,7 @@ inputs:
     required: false
     default: 0
   cc:
-    description: Set up cc/clang/c++/clang++ executables
+    description: Set up cc/c++ executables
     required: false
     default: 1
   hardlinks:
@@ -75,6 +75,15 @@ runs:
             }
         }
 
+        function Get-DistroVersion {
+            if (!(Get-Command lsb_release -ErrorAction SilentlyContinue)) {
+                throw "Couldn't find lsb_release; LLVM only provides repositories for Debian/Ubuntu"
+            }
+            $distro = lsb_release -is
+            $version = lsb_release -sr
+            "$distro-$version"
+        }
+
         function Format-UpstreamVersion {
             param(
                 [Parameter(Mandatory=$true)]
@@ -83,9 +92,8 @@ runs:
 
             switch -Exact ($Version) {
                 # Since version 7, they dropped the .0 suffix. The earliest
-                # version supported is 3.9 on Bionic; versions 4, 5 and 6 are
-                # mapped to LLVM-friendly 4.0, 5.0 and 6.0.
-                '4' { '4.0' }
+                # version supported is 5.0 on Bionic; versions 5 and 6 are
+                # mapped to LLVM-friendly 5.0 and 6.0.
                 '5' { '5.0' }
                 '6' { '6.0' }
                 default { $Version }
@@ -98,12 +106,25 @@ runs:
                 [string] $Version
             )
 
-            if (!(Get-Command lsb_release -ErrorAction SilentlyContinue)) {
-                throw "Couldn't find lsb_release; LLVM only provides repositories for Debian/Ubuntu"
-            }
-            $codename = lsb_release -sc
+            $distro = Get-DistroVersion
 
-            "deb http://apt.llvm.org/$codename/ llvm-toolchain-$codename-$Version main"
+            switch -Wildcard -CaseSensitive ($distro) {
+                'Debian-9*'       { "deb http://apt.llvm.org/stretch/  llvm-toolchain-stretch-$Version  main" }
+                'Debian-10*'      { "deb http://apt.llvm.org/buster/   llvm-toolchain-buster-$Version   main" }
+                'Debian-11*'      { "deb http://apt.llvm.org/bullseye/ llvm-toolchain-bullseye-$Version main" }
+                'Debian-unstable' { "deb http://apt.llvm.org/unstable/ llvm-toolchain-$Version main" }
+                'Debian-testing'  { "deb http://apt.llvm.org/unstable/ llvm-toolchain-$Version main" }
+                'Ubuntu-16.04'    { "deb http://apt.llvm.org/xenial/   llvm-toolchain-xenial-$Version   main" }
+                'Ubuntu-18.04'    { "deb http://apt.llvm.org/bionic/   llvm-toolchain-bionic-$Version   main" }
+                'Ubuntu-18.10'    { "deb http://apt.llvm.org/cosmic/   llvm-toolchain-cosmic-$Version   main" }
+                'Ubuntu-19.04'    { "deb http://apt.llvm.org/disco/    llvm-toolchain-disco-$Version    main" }
+                'Ubuntu-19.10'    { "deb http://apt.llvm.org/eoan/     llvm-toolchain-eoan-$Version     main" }
+                'Ubuntu-20.04'    { "deb http://apt.llvm.org/focal/    llvm-toolchain-focal-$Version    main" }
+                'Ubuntu-20.10'    { "deb http://apt.llvm.org/groovy/   llvm-toolchain-groovy-$Version   main" }
+                'Ubuntu-21.04'    { "deb http://apt.llvm.org/hirsute/  llvm-toolchain-hirsute-$Version  main" }
+
+                default { throw "Unsupported distribution: $distro" }
+            }
         }
 
         function Add-UpstreamRepo {
@@ -138,9 +159,8 @@ runs:
             if (!$x64) {
                 $pkg_gxx = 'g++-multilib'
             }
-            $packages = $pkg_clang,$pkg_llvm,$pkg_gxx
 
-            Install-Package $packages
+            Install-Package $pkg_clang $pkg_llvm $pkg_gxx
         } elseif ($cygwin_host) {
             if (!$x64) {
                 echo @'
@@ -165,8 +185,8 @@ runs:
             throw "Sorry, installing Clang is unsupported on $os"
         }
 
-        echo "clang=$clang"     >> $env:GITHUB_OUTPUT
-        echo "clangxx=$clangxx" >> $env:GITHUB_OUTPUT
+        echo "::set-output name=clang::$clang"
+        echo "::set-output name=clangxx::$clangxx"
       shell: pwsh
 
     - run: |
@@ -178,9 +198,6 @@ runs:
 
         New-Variable cc -Value ('${{ inputs.cc }}' -eq '1') -Option Constant
 
-        New-Variable clang -Value '${{ steps.install.outputs.clang }}' -Option Constant
-        New-Variable clangxx -Value '${{ steps.install.outputs.clangxx }}' -Option Constant
-
         function Link-Exe {
             param(
                 [Parameter(Mandatory=$true)]
@@ -204,14 +221,8 @@ runs:
         }
 
         if ($cc) {
-            Link-Exe $clang cc
-            if ($clang -ne 'clang') {
-                Link-Exe $clang 'clang'
-            }
-            Link-Exe $clangxx c++
-            if ($clangxx -ne 'clang++') {
-                Link-Exe $clangxx 'clang++'
-            }
+            Link-Exe '${{ steps.install.outputs.clang }}' cc
+            Link-Exe '${{ steps.install.outputs.clangxx }}' c++
         }
       shell: pwsh