Add ccache support and update caching paths in build configurations

.github/workflows/build-linux-arm64.yml

@@ -27,7 +27,10 @@ jobs:
       - name: Cache SDK Folder
         uses: actions/cache@v4
         with:
-          path: ${{ github.workspace }}/build/sdk
+          path: |
+            ${{ github.workspace }}/build/.ccache
+            ${{ github.workspace }}/build/sdk
+            ${{ github.workspace }}/build/bin
           key: ${{ runner.os }}-${{ runner.arch }}-sdk
 
       - uses: actions/setup-python@v5

.github/workflows/build-linux-intel.yml

@@ -27,7 +27,10 @@ jobs:
       - name: Cache SDK Folder
         uses: actions/cache@v4
         with:
-          path: ${{ github.workspace }}/build/sdk
+          path: |
+            ${{ github.workspace }}/build/.ccache
+            ${{ github.workspace }}/build/sdk
+            ${{ github.workspace }}/build/bin
           key: ${{ runner.os }}-${{ runner.arch }}-sdk
 
       - uses: actions/setup-python@v5

.github/workflows/build-macos-arm64.yml

@@ -26,7 +26,10 @@ jobs:
       - name: Cache SDK Folder
         uses: actions/cache@v4
         with:
-          path: ${{ github.workspace }}/build/sdk
+          path: |
+            ${{ github.workspace }}/build/.ccache
+            ${{ github.workspace }}/build/sdk
+            ${{ github.workspace }}/build/bin
           key: ${{ runner.os }}-${{ runner.arch }}-sdk
 
       - uses: actions/setup-python@v5

.github/workflows/build-macos-intel.yml

@@ -24,7 +24,10 @@ jobs:
       - name: Cache SDK Folder
         uses: actions/cache@v4
         with:
-          path: ${{ github.workspace }}/build/sdk
+          path: |
+            ${{ github.workspace }}/build/.ccache
+            ${{ github.workspace }}/build/sdk
+            ${{ github.workspace }}/build/bin
           key: ${{ runner.os }}-${{ runner.arch }}-sdk
 
       - uses: actions/setup-python@v5

.github/workflows/build-windows-intel.yml

@@ -24,7 +24,10 @@ jobs:
       - name: Cache SDK Folder
         uses: actions/cache@v4
         with:
-          path: ${{ github.workspace }}/build/sdk
+          path: |
+            ${{ github.workspace }}/build/.ccache
+            ${{ github.workspace }}/build/sdk
+            ${{ github.workspace }}/build/bin
           key: ${{ runner.os }}-${{ runner.arch }}-sdk
 
       - uses: actions/setup-python@v5

CMakeLists.txt

@@ -7,7 +7,6 @@ PROJECT(Lethean)
 
 set(VERSION "1.0" CACHE STRING "Build version")
 
-
 message("OPENSSL_INCLUDE_DIR: ${OPENSSL_INCLUDE_DIR}")
 message("OPENSSL_CRYPTO_LIBRARY: ${OPENSSL_CRYPTO_LIBRARY}")
 message("OPENSSL_SSL_LIBRARY: ${OPENSSL_SSL_LIBRARY}")
@@ -15,6 +14,12 @@ message("OPENSSL_SSL_LIBRARY: ${OPENSSL_SSL_LIBRARY}")
 list(INSERT CMAKE_MODULE_PATH 0
         "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 include(DocBuilder)
+option (USE_CCACHE "Use ccache if a usable instance is found" ON)
+if (USE_CCACHE)
+  include(FindCcache)
+else()
+    message(STATUS "ccache deselected")
+endif()
 
 if(POLICY CMP0043)
   cmake_policy(SET CMP0043 NEW)

cmake/CleanBuild.cmake

@@ -21,6 +21,7 @@ function(selective_clean_build_dir)
 
         # List of top-level items in the build directory to keep.
         set(golden_items
+            "${CMAKE_SOURCE_DIR}/build/.ccache"
             "${CMAKE_SOURCE_DIR}/build/bin"
             "${CMAKE_SOURCE_DIR}/build/docs"
             "${CMAKE_SOURCE_DIR}/build/sdk"

cmake/FindCcache.cmake

@@ -0,0 +1,26 @@
+find_program(CCACHE_FOUND ccache)
+if (CCACHE_FOUND)
+    # Try to compile a test program with ccache, in order to verify if it really works. (needed on exotic setups)
+    set(TEST_PROJECT "${CMAKE_BINARY_DIR}/${CMAKE_FILES_DIRECTORY}/CMakeTmp")
+    file(WRITE "${TEST_PROJECT}/CMakeLists.txt" [=[
+cmake_minimum_required(VERSION 3.10)
+project(test)
+option (CCACHE "")
+file(WRITE "${CMAKE_SOURCE_DIR}/test.cpp" "int main() { return 0; }")
+set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE "${CCACHE} cache_dir=${CMAKE_SOURCE_DIR}/build/.ccache")
+set_property(GLOBAL PROPERTY RULE_LAUNCH_LINK    "${CCACHE} cache_dir=${CMAKE_SOURCE_DIR}/build/.ccache")
+add_executable(main test.cpp)
+]=])
+    try_compile(RET "${TEST_PROJECT}/build" "${TEST_PROJECT}" "test" CMAKE_FLAGS -DCCACHE="${CCACHE_FOUND}")
+    unset(TEST_PROJECT)
+    if (${RET})
+        # Success
+        message(STATUS "Found usable ccache: ${CCACHE_FOUND}")
+        set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE "${CCACHE_FOUND} cache_dir=${CMAKE_SOURCE_DIR}/build/.ccache")
+        set_property(GLOBAL PROPERTY RULE_LAUNCH_LINK    "${CCACHE_FOUND} cache_dir=${CMAKE_SOURCE_DIR}/build/.ccache")
+    else()
+        message(STATUS "Found ccache ${CCACHE_FOUND}, but is UNUSABLE! Return code: ${RET}")
+    endif()
+else()
+    message(STATUS "ccache NOT found! Please install it for faster rebuilds.")
+endif()

conanfile.py

@@ -18,6 +18,8 @@ class BlockchainConan(ConanFile):
         "testnet": False
     }
 
+    tool_requires = "ccache/4.11"
+
     requires = [
         "zlib/1.3.1",
         "boost/1.85.0",