travis: Enable ccache

.travis.yml

@@ -41,6 +41,10 @@ env:
     # default target name for functional tests
     - FUNCTIONALTEST=functionaltest
     - CI_TARGET=tests
+    # Environment variables for ccache
+    - CCACHE_COMPRESS=1
+    - CCACHE_SLOPPINESS=time_macros,file_macro
+    - CCACHE_BASEDIR="$TRAVIS_BUILD_DIR"
 
 jobs:
   include:
@@ -118,6 +122,7 @@ branches:
 
 cache:
   apt: true
+  ccache: true
   directories:
     - "$HOME/.cache/pip"
     - "$HOME/.cache/nvim-deps"

ci/before_cache.sh

@@ -14,6 +14,9 @@ rm -f "${HOME}/.cache/pip/selfcheck.json"
 echo "before_cache.sh: cache size"
 du -d 2 "${HOME}/.cache" | sort -n
 
+echo "before_cache.sh: ccache stats"
+ccache -s 2>/dev/null || true
+
 # Update the third-party dependency cache only if the build was successful.
 if ended_successfully; then
   rm -rf "${HOME}/.cache/nvim-deps"

ci/before_script.sh

@@ -20,6 +20,9 @@ if [[ -n "${LLVM_SYMBOLIZER}" ]] && [[ ! $(type -P "${LLVM_SYMBOLIZER}") ]]; the
   exit 1
 fi
 
+# Show ccache stats so we can compare in before_cache
+ccache -s 2>/dev/null || true
+
 if [[ "${TRAVIS_OS_NAME}" == osx ]]; then
   # Adds user to a dummy group.
   # That allows to test changing the group of the file by `os_fchown`.

ci/common/build.sh

@@ -30,7 +30,9 @@ build_deps() {
   mkdir -p "${DEPS_DOWNLOAD_DIR}"
 
   # Use cached dependencies if $CACHE_MARKER exists.
-  if test -f "${CACHE_MARKER}" && ! test "${CACHE_ENABLE}" = "false" ; then
+  if test "${CACHE_ENABLE}" = "false" ; then
+    export CCACHE_RECACHE=1
+  elif test -f "${CACHE_MARKER}" ; then
     echo "Using third-party dependencies from Travis cache (last update: $(_stat "${CACHE_MARKER}"))."
     cp -r "${HOME}/.cache/nvim-deps"/. "${DEPS_BUILD_DIR}"
     cp -r "${HOME}/.cache/nvim-deps-downloads" "${DEPS_DOWNLOAD_DIR}"

ci/install.sh

@@ -11,6 +11,8 @@ if [[ "${TRAVIS_OS_NAME}" == osx ]]; then
   brew install ninja
   brew install gettext
   brew reinstall -s libtool
+  brew install ccache
+  export PATH="/usr/local/opt/ccache/libexec:$PATH"
 fi
 
 echo "Install neovim module for Python 3."