From 28f3f4caa2ffee38da15d0331a8c275f481d9d09 Mon Sep 17 00:00:00 2001
From: Axel Huebl <axel.huebl@plasma.ninja>
Date: Fri, 4 Mar 2022 09:08:33 -0800
Subject: [PATCH] CI: CCache for GNUmake CUDA

---
 .github/workflows/cuda.yml | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/.github/workflows/cuda.yml b/.github/workflows/cuda.yml
index 04c4ba76b06..8c2c1f58659 100644
--- a/.github/workflows/cuda.yml
+++ b/.github/workflows/cuda.yml
@@ -85,6 +85,16 @@ jobs:
     - name: install dependencies
       run: |
         .github/workflows/dependencies/nvcc11.sh
+    - name: CCache Cache
+      uses: actions/cache@v2
+      # - once stored under a key, they become immutable (even if local cache path content changes)
+      # - for a refresh the key has to change, e.g., hash of a tracked file in the key
+      with:
+        path: ~/.ccache
+        key: ccache-cuda-gnumake-${{ hashFiles('.github/workflows/cuda.yml') }}-${{ hashFiles('cmake/dependencies/AMReX.cmake') }}
+        restore-keys: |
+          ccache-cuda-gnumake-${{ hashFiles('.github/workflows/cuda.yml') }}-
+          ccache-cuda-gnumake-
     - name: build WarpX
       run: |
         export PATH=/usr/local/nvidia/bin:/usr/local/cuda/bin:${PATH}