Enable configure caching to try to speed up builds, especially of cares.

[appveyor skip]

.gitignore

@@ -45,6 +45,7 @@ docs/__pycache__
 # Artifacts of configuring in place
 deps/c-ares/config.log
 deps/c-ares/config.status
+deps/c-ares/config.cache
 deps/c-ares/stamp-h1
 deps/c-ares/stamp-h2
 deps/c-ares/ares_build.h.orig
@@ -73,6 +74,7 @@ deps/libev/Makefile
 deps/libev/config.log
 deps/libev/config.h
 deps/libev/config.status
+deps/libev/config.cache
 deps/libev/configure-output.txt
 deps/libev/libtool
 deps/libev/stamp-h1
@@ -86,6 +88,7 @@ deps/libuv/Makefile
 deps/libuv/config.log
 deps/libuv/config.h
 deps/libuv/config.status
+deps/libev/config.cache
 deps/libduv/libtool
 deps/libuv/stamp-h1
 deps/libuv/.libs

.travis.yml

@@ -51,6 +51,10 @@ matrix:
 before_install:
   - export PATH=$BUILD_RUNTIMES/snakepit/$TRAVIS_PYTHON_VERSION.d/bin:$PATH
   - export G_SITE=$BUILD_RUNTIMES/snakepit/$TRAVIS_PYTHON_VERSION.d/lib/*/site-packages/
+  # Restore the configure caches
+  - if [-f $BUILD_LIBS/config.cache.ares ]; then cp $BUILD_LIBS/config.cache.ares deps/c-ares/ ; fi
+  - if [-f $BUILD_LIBS/config.cache.libev ]; then cp $BUILD_LIBS/config.cache.ares deps/libev/ ; fi
+  - if [-f $BUILD_LIBS/config.cache.libuv ]; then cp $BUILD_LIBS/config.cache.ares deps/libuv/ ; fi
 
 before_script:
   # Show some details of interest
@@ -62,6 +66,25 @@ before_script:
   - >
     python -c "import gevent.ares; print(gevent.ares)"
 
+cache:
+  pip: true
+  directories:
+    - $HOME/.venv
+    - $HOME/.runtimes
+    - $HOME/.wheelhouse
+    - $HOME/.ccache
+    - $HOME/.libs
+
+before_cache:
+    - rm -f $HOME/.cache/pip/log/debug.log
+    # Store the configure caches. Having a cache can speed up c-ares
+    # configure from 2-3 minutes to 20 seconds.
+    - mkdir -p $BUILD_LIBS
+    - cp deps/c-ares/config.cache $BUILD_LIBS/config.cache.ares
+    - cp deps/libev/config.cache $BUILD_LIBS/config.cache.libev
+    - cp deps/libuv/config.cache $BUILD_LIBS/config.cache.libuv
+
+
 # Installing is taken care of by the first stage.
 install:
   - ls -l $BUILD_RUNTIMES/snakepit/
@@ -139,7 +162,7 @@ jobs:
         # well as we would hope.
         - pushd deps/libev && ./configure --prefix=$BUILD_LIBS && make install && popd
         - pushd deps/c-ares && ./configure --prefix=$BUILD_LIBS && make -j4 install && popd
-        - pushd deps/libuv && ./autogen.sh && ./configure --disable-static --prefix=$BUILD_LIBS && make -j4 install && popd
+        - pushd deps/libuv && ./autogen.sh && ./configure -C --disable-static --prefix=$BUILD_LIBS && make -j4 install && popd
         # libev builds a manpage each time, and it includes today's date, so it frequently changes.
         # delete to avoid repacking the archive
         - rm -rf $BUILD_LIBS/share/man/
@@ -279,16 +302,3 @@ jobs:
 
 notifications:
   email: false
-
-
-cache:
-  pip: true
-  directories:
-    - $HOME/.venv
-    - $HOME/.runtimes
-    - $HOME/.wheelhouse
-    - $HOME/.ccache
-    - $HOME/.libs
-
-before_cache:
-    - rm -f $HOME/.cache/pip/log/debug.log

_setupares.py

@@ -43,7 +43,7 @@ else:
 ares_configure_command = ' '.join([
     "(cd ", quoted_dep_abspath('c-ares'),
     " && if [ -r ares_build.h ]; then cp ares_build.h ares_build.h.orig; fi ",
-    " && sh ./configure --disable-dependency-tracking " + _m32 + "CONFIG_COMMANDS= ",
+    " && sh ./configure --disable-dependency-tracking -C " + _m32 + "CONFIG_COMMANDS= ",
     " && cp ares_config.h ares_build.h \"$OLDPWD\" ",
     " && cat ares_build.h ",
     " && if [ -r ares_build.h.orig ]; then mv ares_build.h.orig ares_build.h; fi)",

_setuplibev.py

@@ -30,7 +30,7 @@ LIBEV_EMBED = should_embed('libev')
 # Configure libev in place
 libev_configure_command = ' '.join([
     "(cd ", quoted_dep_abspath('libev'),
-    " && sh ./configure > configure-output.txt",
+    " && sh ./configure -C > configure-output.txt",
     ")",
 ])
 

_setuputils.py

@@ -391,6 +391,7 @@ class GeventClean(clean):
                     'config.h',
                     'config.log',
                     'config.status',
+                    'config.cache',
                     'configure-output.txt',
                     '.libs'
             ):