Travis: use ccache (#3307)

8adc73c2 · Christian Heimes · GitHub · 06930631 · 8adc73c2
Commit 8adc73c2 authored Sep 05, 2017 by Christian Heimes Committed by GitHub Sep 05, 2017
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.travis.yml .travis.yml +4 -2

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--- a/.travis.yml
+++ b/.travis.yml
@@ -3,8 +3,10 @@ dist: trusty
 sudo: false
 group: beta
-# To cache doc-building dependencies.
+# To cache doc-building dependencies and C compiler output.
-cache: pip
+cache:
+    - pip
+    - ccache
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