support ccache

conda_smithy/templates/circle.yml.tmpl

@@ -27,11 +27,20 @@ jobs:
           command: |
             ./.circleci/fast_finish_ci_pr_build.sh
             ./.circleci/checkout_merge_commit.sh
+      - restore_cache:
+          keys:
+            - ccache-{{ '{{' }} .Branch {{ '}}' }}
+            - ccache-master
       - run:
           command: docker pull {{ docker.image }}
       - run:
           # Run, test and (if we have a BINSTAR_TOKEN) upload the distributions.
           command: ./.circleci/run_docker_build.sh
+      - save_cache:
+          key: ccache-{{ '{{' }} .Branch {{ '}}' }}
+          paths:
+            - ./build_artifacts/.ccache
+          when: always
 {%- endfor -%}
 {%- endif -%}
 {%- endblock %}

conda_smithy/templates/run_docker_build.tmpl

@@ -60,7 +60,11 @@ conda install --yes --quiet conda-forge-build-setup=1
 {% if build_setup -%}
 {{ build_setup }}{% endif -%}
 
-conda build /home/conda/recipe_root -m /home/conda/feedstock_root/.ci_support/${CONFIG}.yaml --quiet || exit 1
+# ccache uses the compiler command line to generate the cache keys, so we can't have a
+# different path for every build. ccache provides CCACHE_BASEDIR variable to solve this
+# but it's better to avoid setting it as it has some side effects.
+conda build --no-build-id /home/conda/recipe_root -m /home/conda/feedstock_root/.ci_support/${CONFIG}.yaml --quiet || exit 1
+
 {%- for owner, channel in channels['targets'] %}
 {{ upload_script }} /home/conda/recipe_root {{ owner }} --channel={{ channel }} -m /home/conda/feedstock_root/.ci_support/${CONFIG}.yaml || exit 1
 {%- endfor %}

conda_smithy/templates/travis.yml.tmpl

@@ -6,6 +6,10 @@ language: generic
 os: osx
 osx_image: xcode6.4
 
+cache:
+  directories:
+  - $HOME/.ccache
+
 {% block env -%}
 {% if configs[0] or travis.secure -%}
 env:
@@ -66,7 +70,10 @@ install:
       {{ build_setup }}{% endif %}
 
 script:
-  - conda build ./{{ recipe_dir }} -m ./.ci_support/${CONFIG}.yaml
+  # ccache uses the compiler command line to generate the cache keys, so we can't have a
+  # different path for every build. ccache provides CCACHE_BASEDIR variable to solve this
+  # but it's better to avoid setting it as it has some side effects.
+  - conda build --no-build-id ./{{ recipe_dir }} -m ./.ci_support/${CONFIG}.yaml
 {% for owner, channel in channels['targets'] %}
   - {{ upload_script }} ./{{ recipe_dir }} {{ owner }} --channel={{ channel }} -m ./.ci_support/${CONFIG}.yaml
 {% endfor %}