Update ccache.md

Add reference [skip ci]
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Soonho Kong 2013-09-14 21:31:31 -07:00
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@ -41,3 +41,5 @@ with the following content:
argument unused during compilation:" warning. argument unused during compilation:" warning.
- ``-fcolor-diagnostics`` option is used to enable clang's colored - ``-fcolor-diagnostics`` option is used to enable clang's colored
diagnostic messages. diagnostic messages.
Reference: http://petereisentraut.blogspot.com/2011/05/ccache-and-clang.html