From 2113853bafe637a55a531498f63158dacf11320a Mon Sep 17 00:00:00 2001
From: Egor Tensin <Egor.Tensin@gmail.com>
Date: Sat, 2 Jan 2021 07:55:53 +0300
Subject: set up cc/c++ executables

---
 .github/workflows/test.yml | 10 ++++++++++
 action.yml                 | 41 +++++++++++++++++++++++++++++++++++++++--
 2 files changed, 49 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index ffffe70..2dcc535 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -85,3 +85,13 @@ jobs:
           Unexpected output:
           $actual
           "@)
+
+      # Is this really the most stable piece of `gcc --version` output?
+      - name: Check cc/c++
+        run: |
+          $cc = & cc --version
+          echo $cc
+          $($cc | Select-String -Pattern "This is free software; see the source for copying conditions." -SimpleMatch -Quiet) -or $(throw "Unexpected `cc --version` output")
+          $cxx = & c++ --version
+          echo $cxx
+          $($cxx | Select-String -Pattern "This is free software; see the source for copying conditions." -SimpleMatch -Quiet) -or $(throw "Unexpected `c++ --version` output")
diff --git a/action.yml b/action.yml
index b05f777..8b2a038 100644
--- a/action.yml
+++ b/action.yml
@@ -14,8 +14,7 @@ inputs:
 runs:
   using: composite
   steps:
-    - id: setup
-      run: |
+    - run: |
         New-Variable os -Value '${{ runner.os }}' -Option Constant
 
         New-Variable linux_host -Value ($os -eq 'Linux') -Option Constant
@@ -33,6 +32,38 @@ runs:
             }
         }
 
+        function Make-Link {
+            param(
+                [Parameter(Mandatory=$true)]
+                [string] $ExeName,
+                [Parameter(Mandatory=$true)]
+                [string] $LinkName
+            )
+
+            $exe_path = (Get-Command $ExeName).Path
+            $exe_dir = Split-Path $exe_path
+            $exe_name = Split-Path $exe_path -Leaf
+            if (!$exe_name.StartsWith($ExeName)) {
+                throw "'$exe_name' must start with '$ExeName'"
+            }
+            $ext = $exe_name.Substring($ExeName.Length)
+
+            $link_dir = if ($script:linux_host) { '/usr/local/bin' } else { $exe_dir }
+            $link_name = $LinkName + $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 $exe_path | Out-Null
+            }
+        }
+
         if ($linux_host) {
             sudo apt update
             if ($x64) {
@@ -40,6 +71,9 @@ runs:
             } else {
                 sudo apt install -y g++-multilib
             }
+
+            Make-Link -Exe gcc -LinkName cc
+            Make-Link -Exe g++ -LinkName c++
         } elseif ($cygwin_host) {
             if (!$x64) {
                 echo @'
@@ -51,6 +85,9 @@ runs:
             }
             $choco = Locate-Choco
             & $choco install -y --no-progress --source=cygwin gcc-g++
+
+            Make-Link -Exe gcc -LinkName cc
+            Make-Link -Exe g++ -LinkName c++
         } elseif ($windows_host) {
             # TODO: use setup-mingw when calling composite actions within
             # composite actions is implemented.
-- 
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