aboutsummaryrefslogtreecommitdiffstatshomepage
path: root/action.yml
blob: 4fde9a5cc956934ffd536aa5510aff2e6dcf105e (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
name: Install Clang
description: Install Clang & LLVM

inputs:
  platform:
    description: Target platform
    required: false
    default: x64
  cygwin:
    description: Install inside Cygwin
    required: false
    default: 0

runs:
  using: composite
  steps:
    - run: |
        New-Variable os -Value '${{ runner.os }}' -Option Constant

        New-Variable linux_host -Value ($os -eq 'Linux') -Option Constant
        New-Variable cygwin_host -Value ('${{ inputs.cygwin }}' -eq '1') -Option Constant
        New-Variable windows_host -Value ($os -eq 'Windows' -and !$cygwin) -Option Constant

        New-Variable x64 -Value ('${{ inputs.platform }}' -eq 'x64') -Option Constant

        function Locate-Choco {
            $path = Get-Command 'choco' -ErrorAction SilentlyContinue
            if ($path) {
                $path.Path
            } else {
                Join-Path ${env:ProgramData} 'chocolatey' 'bin' 'choco'
            }
        }

        function Install-Package {
            param(
                [Parameter(Mandatory=$true, ValueFromRemainingArguments=$true)]
                [string[]] $Packages
            )

            if ($script:linux_host) {
                sudo apt-get update -yq
                sudo apt-get install -yq --no-install-recommends $Packages
            } elseif ($script:cygwin_host) {
                $choco = Locate-Choco
                & $choco install -y --no-progress --source=cygwin $Packages
            } elseif ($script:windows_host) {
                $choco = Locate-Choco
                & $choco install -y --no-progress $Packages
            } else {
                throw "Sorry, installing packages is unsupported on $script:os"
            }
        }

        function Link-Exe {
            param(
                [Parameter(Mandatory=$true)]
                [string] $ExeName,
                [Parameter(Mandatory=$true)]
                [string] $LinkName
            )

            # Full executable path, including the extension:
            $exe_path = (Get-Command $ExeName).Path
            $exe_dir = Split-Path $exe_path
            $exe_name = Split-Path $exe_path -Leaf
            $exe_ext = [System.IO.Path]::GetExtension($exe_name)

            $link_dir = if ($script:linux_host) { '/usr/local/bin' } else { $exe_dir }
            $link_name = $LinkName
            # On Windows, append .exe if required:
            if (!$script:linux_host -and [System.IO.Path]::GetExtension($link_name) -ne $exe_ext) {
                $link_name += $exe_ext
            }
            $link_path = Join-Path $link_dir $link_name

            echo "Creating link '$link_path', pointing to '$exe_path'"
            if ($script:linux_host) {
                sudo rm -f -- $link_path
                sudo ln -s -- $exe_path $link_path
            } else {
                if (Test-Path $link_path) {
                    Remove-Item $link_path -Force
                }
                New-Item -ItemType HardLink -Path $link_path -Value $exe_path | Out-Null
            }
        }

        function Convert-CygwinPath {
            # Like cygpath -wa, but don't resolve symlinks.
            param(
                [Parameter(Mandatory=$true)]
                [string] $Path
            )

            $realpath = realpath.exe --no-symlinks -- $Path
            $dirname = dirname.exe -- $realpath
            $dirname = cygpath.exe -wa $dirname
            Join-Path $dirname (Split-Path $realpath -Leaf)
        }

        function Fix-CygwinLink {
            # Replace a Cygwin symlink with a hardlink.
            param(
                [Parameter(Mandatory=$true)]
                [string] $Path
            )

            $link_path = $Path
            $link_winpath = Convert-CygwinPath $link_path
            $link_ext = [System.IO.Path]::GetExtension($link_path)

            $dest_path = readlink.exe --canonicalize-existing -- $link_path
            $dest_winpath = Convert-CygwinPath $dest_path
            $dest_ext = [System.IO.Path]::GetExtension($dest_path)

            echo "Removing symlink: $link_winpath"
            Remove-Item $link_winpath -Force

            if ($dest_ext.ToLower() -ne $link_ext.ToLower()) {
                $link_winpath += $dest_ext
            }
            echo "Creating hardlink '$link_winpath', pointing to '$dest_winpath'"
            New-Item -ItemType HardLink -Path $link_winpath -Value $dest_winpath | Out-Null
        }

        if ($linux_host) {
            if ($x64) {
                $pkgs = 'clang','g++'
            } else {
                $pkgs = 'clang','g++-multilib'
            }
            Install-Package $pkgs

            Link-Exe -Exe clang -LinkName cc
            Link-Exe -Exe clang++ -LinkName c++
        } elseif ($cygwin_host) {
            if (!$x64) {
                echo @'
        ::warning ::
        32-bit-targeting Clang is unavailable on 64-bit Cygwin.
        Please use 32-bit Cygwin instead.
        If you _are_ using 32-bit Cygwin, please ignore this message.
        '@
            }

            # IDK why, but without libiconv-devel, even a "Hello, world!"
            # C++ app cannot be compiled as of December 2020. Also, libstdc++
            # is required; it's simpler to install gcc-g++ for all the
            # dependencies.
            Install-Package clang libiconv-devel gcc-g++

            # clang/clang++ are Cygwin symlinks, pointing to clang-X.exe. It's
            # convenient to make proper executables instead so that they can be
            # called from Windows' command prompt.
            find.exe /usr/bin -iname 'clang*' -type l | %{ Fix-CygwinLink $_ }

            Link-Exe -Exe clang -LinkName cc
            Link-Exe -Exe clang++ -LinkName c++
        } elseif ($windows_host) {
            Install-Package llvm

            $bin_dir = Join-Path $env:ProgramFiles LLVM bin
            echo $bin_dir >> $env:GITHUB_PATH

            Link-Exe -Exe (Join-Path $bin_dir clang) -LinkName cc
            Link-Exe -Exe (Join-Path $bin_dir clang++) -LinkName c++
        } else {
            throw "Sorry, installing Clang is unsupported on $os"
        }
      shell: pwsh

branding:
  icon: star
  color: green