Use ccache to speed up build

.github/workflows/wheels.yml

@@ -58,6 +58,8 @@ jobs:
         env:
           CIBW_PRERELEASE_PYTHONS: True
           CIBW_BUILD: ${{ matrix.python }}-${{ matrix.buildplat[1] }}
+          CIBW_ENVIRONMENT: USE_CCACHE=1 CCACHE_DIR=/.ccache
+          CIBW_CONTAINER_ENGINE: "docker; create_args: '--volume=${{ github.workspace  }}/.ccache:/.ccache'"
 
       - uses: actions/upload-artifact@0b7f8abb1508181956e8e162db84b466c27e18ce # v3.1.2
         with:

builder.py

@@ -71,11 +71,14 @@ class ExtensionBuilder(build_ext):
 
         env = os.environ.copy()
         env["CXXFLAGS"] = '{} -DVERSION_INFO=\\"{}\\"'.format(env.get("CXXFLAGS", ""), self.distribution.get_version())
-
+        
         build_dir = os.path.join(self.build_temp, ext.sourcedir_rel)
         install_dir = os.path.join(extdir, 'Coriolis')
         os.makedirs(build_dir,exist_ok=True)
 
+        if "USE_CCACHE" in env:
+            cmake_args += ["-DCMAKE_CXX_COMPILER_LAUNCHER=ccache"]
+
         cmake_args += [f"-DCMAKE_MODULE_PATH={os.path.abspath('bootstrap/cmake_modules')};"
                        f"{os.path.join(install_dir, 'share/cmake/Modules')}"]
         cmake_args += [f"-DCMAKE_INSTALL_PREFIX={install_dir}"]

pyproject.toml

@@ -53,6 +53,7 @@ before-all = '''
  boost-python boost-filesystem \
  boost-regex  boost-wave \
  python36-devel libxml2-devel \
- qwt-devel
+ qwt-devel \
+ ccache
 '''
 build-verbosity=2