Use ccache on Linux and macOS CI

Apparently Visual Studio is a work-in-progress.

Author: trflynn89

build/ci/cache.yml

@@ -0,0 +1,18 @@
+parameters:
+  toolchain: 'clang'
+  mode: 'debug'
+  arch: 'x64'
+
+steps:
+  - task: Cache@2
+    inputs:
+      key: 'ccache | "${{ parameters.toolchain }}" | "${{ parameters.mode }}" | "${{ parameters.arch }}"'
+      restoreKeys: |
+        ccache | "${{ parameters.toolchain }}" | "${{ parameters.mode }}" | "${{ parameters.arch }}"
+      path: $(CCACHE_DIR)
+    displayName: 'Compiler Cache'
+
+  - script: |
+      ccache -M 5G
+      ccache -s
+    displayName: 'Configure Compiler Cache'

build/ci/linux.yml

@@ -7,6 +7,10 @@ parameters:
 jobs:
   - job: 'Linux_${{ parameters.toolchain }}_${{ parameters.mode }}_${{ parameters.arch }}'
 
+    variables:
+    - name: CCACHE_DIR
+      value: $(Build.SourcesDirectory)/ccache
+
     pool:
       vmImage: ubuntu-20.04
 
@@ -17,13 +21,19 @@ jobs:
     steps:
     - template: setup.yml
 
+    - template: cache.yml
+      parameters:
+        toolchain: ${{ parameters.toolchain }}
+        mode: ${{ parameters.mode }}
+        arch: ${{ parameters.arch }}
+
     - ${{ if eq(parameters.mode, 'release') }}:
       - script: |
           make style check=1
         displayName: 'Style'
 
     - script: |
-        echo "##vso[task.setvariable variable=config]mode=${{ parameters.mode }} toolchain=${{ parameters.toolchain }} arch=${{ parameters.arch }} coverage=${{ parameters.coverage }}"
+        echo "##vso[task.setvariable variable=config]mode=${{ parameters.mode }} toolchain=${{ parameters.toolchain }} arch=${{ parameters.arch }} cacher=ccache coverage=${{ parameters.coverage }}"
       displayName: 'Configure'
 
     - ${{ if eq(parameters.mode, 'debug') }}:

build/ci/macos.yml

@@ -4,6 +4,10 @@ parameters:
 jobs:
   - job: 'macOS_${{ parameters.mode }}'
 
+    variables:
+    - name: CCACHE_DIR
+      value: $(Build.SourcesDirectory)/ccache
+
     pool:
       vmImage: macOS-10.15
 
@@ -14,8 +18,14 @@ jobs:
 
     - template: setup.yml
 
+    - template: cache.yml
+      parameters:
+        toolchain: ${{ parameters.toolchain }}
+        mode: ${{ parameters.mode }}
+        arch: ${{ parameters.arch }}
+
     - script: |
-        echo "##vso[task.setvariable variable=config]mode=${{ parameters.mode }}"
+        echo "##vso[task.setvariable variable=config]mode=${{ parameters.mode }} cacher=ccache"
       displayName: 'Configure'
 
     - ${{ if eq(parameters.mode, 'debug') }}: