Fix Travis cache config: remove ccache, add OS X pip cache

ccache on Travis was never configured properly so the setting never actually did anything. Enabling ccache for real brings other issues: due to the way the preprocessor is handled, some of the Python header macros produce bogus compiler warnings (which in turn produce errors with -Werror). ccache also requires additional configuration on OS X and docker. It would reduce compile time by ~30 seconds at best, so it's not worth the trouble. [skip appveyor]

Fix Travis cache config: remove ccache, add OS X pip cache
ccache on Travis was never configured properly so the setting never actually did anything. Enabling ccache for real brings other issues: due to the way the preprocessor is handled, some of the Python header macros produce bogus compiler warnings (which in turn produce errors with -Werror). ccache also requires additional configuration on OS X and docker. It would reduce compile time by ~30 seconds at best, so it's not worth the trouble. [skip appveyor]
14bd10d6 · Dean Moldovan · b62a896f · 14bd10d6
Commit 14bd10d6 authored Aug 26, 2016 by Dean Moldovan
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.travis.yml
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--- a/.travis.yml
+++ b/.travis.yml
@@ -44,7 +44,7 @@ matrix:
 cache:
  directories:
  - $HOME/.cache/pip
-  - ccache
+  - $HOME/Library/Caches/pip
 before_install:
 - |
  # Configure build variables