Speed up Appveyor builds with ccache (#4823)

CMakeLists.txt

@@ -183,6 +183,11 @@ if(WIN32)
         if(MSVC)
             # Reduce noise (at least for now)
             set(CMAKE_${L}_FLAGS "${CMAKE_${L}_FLAGS} /wd4244 /wd4267")
+            # Make caching-friendly (store debug info inside object files)
+            foreach(T IN ITEMS ${CMAKE_CONFIGURATION_TYPES} ${CMAKE_BUILD_TYPE})
+                string(TOUPPER "${T}" T)
+                string(REGEX REPLACE "[-/]Z[iI]" "-Z7" CMAKE_${L}_FLAGS_${T} "${CMAKE_${L}_FLAGS_${T}}")
+            endforeach()
         endif()
 
         if(MINGW)

appveyor.yml

@@ -27,6 +27,13 @@ for:
 
   clone_folder: '%SystemDrive%\%TR_ARCH%-project'
 
+  cache:
+  - '%SystemDrive%\%TR_ARCH%-ccache'
+
+  init:
+  - pwsh: |
+      $Env:APPVEYOR_SAVE_CACHE_ON_ERROR = 'true'
+
   install:
   - pwsh: |
       $Version = git describe --tags --abbrev=10 --always
@@ -47,6 +54,7 @@ for:
       choco install nasm
       choco install jom
       choco install wixtoolset --version 3.11.2
+      choco install ccache
 
       Remove-Item -Path (Join-Path $Env:SystemDrive OpenSSL-Win32) -Recurse
       Remove-Item -Path (Join-Path $Env:SystemDrive OpenSSL-Win64) -Recurse
@@ -62,12 +70,16 @@ for:
           $Env:PATH
       ) -join [System.IO.Path]::PathSeparator
 
+      $Env:CCACHE_DIR = "${Env:SystemDrive}\${Env:TR_ARCH}-ccache"
+      $Env:CCACHE_MAXSIZE = '500Mi'
+
       Set-ExecutionPolicy -Scope Process Bypass
 
       try {
           & (Join-Path $Env:APPVEYOR_BUILD_FOLDER release windows main.ps1) `
               -Mode Build `
               -BuildArch $env:TR_ARCH `
+              -CCachePart App `
               -PackDebugSyms:$($Env:APPVEYOR_REPO_BRANCH -eq "main" -or $Env:APPVEYOR_REPO_TAG -eq "true")
       } catch {
           Write-Error ("{1}{0}{2}{0}{3}" -f [Environment]::NewLine, $_.ToString(), $_.InvocationInfo.PositionMessage, $_.ScriptStackTrace) -ErrorAction Continue

release/windows/main.ps1

@@ -13,6 +13,10 @@ Param(
     [ValidateSet('All', 'Deps', 'App')]
     [string] $BuildPart = 'All',
 
+    [Parameter()]
+    [ValidateSet('None', 'All', 'Deps', 'App')]
+    [string] $CCachePart = 'None',
+
     [Parameter()]
     [string] $SourceDir,
 
@@ -266,6 +270,14 @@ if ($Mode -eq 'Build') {
     $env:CXXFLAGS = $CompilerFlags -join ' '
     $env:LDFLAGS = $LinkerFlags -join ' '
 
+    if (@('All', 'Deps') -contains $CCachePart) {
+        $Env:CMAKE_C_COMPILER_LAUNCHER = 'ccache'
+        $Env:CMAKE_CXX_COMPILER_LAUNCHER = 'ccache'
+    } else {
+        $Env:CMAKE_C_COMPILER_LAUNCHER = ''
+        $Env:CMAKE_CXX_COMPILER_LAUNCHER = ''
+    }
+
     if (@('All', 'Deps') -contains $BuildPart) {
         Invoke-Build Expat
         Invoke-Build DBus
@@ -275,6 +287,14 @@ if ($Mode -eq 'Build') {
         Invoke-Build Qt
     }
 
+    if (@('All', 'App') -contains $CCachePart) {
+        $Env:CMAKE_C_COMPILER_LAUNCHER = 'ccache'
+        $Env:CMAKE_CXX_COMPILER_LAUNCHER = 'ccache'
+    } else {
+        $Env:CMAKE_C_COMPILER_LAUNCHER = ''
+        $Env:CMAKE_CXX_COMPILER_LAUNCHER = ''
+    }
+
     if (@('All', 'App') -contains $BuildPart) {
         Invoke-Build Transmission -NoCache -MoreArguments @($SourceDir, $SourceDir, $PackDebugSyms.IsPresent)
     }