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Fix clang warnings on linux travis build.
By passing the original file to *clang* when the preprocessed file is not found in the cache. The [-Wself-assign] warnings are caused by macro expansion in the preprocessed file. *Clang* is smart enough not to emit false warnings on the original files. Not necessary for *osx* since the brewfile *ccache* is already at 3.4.1. Since ccache 3.3 `CCACHE_CPP2` defaults to TRUE. Travis linux however is still at 3.1.9 hence the need for exporting this variable.
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‎.travis.yml‎

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@@ -29,6 +29,7 @@ before_install:
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- if [ $TRAVIS_OS_NAME == linux ]; then mkdir $TRAVIS_BUILD_DIR/dependency-prefix; fi
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- if [ $TRAVIS_OS_NAME == linux ]; then export PKG_CONFIG_PATH=$TRAVIS_BUILD_DIR/dependency-prefix/lib/pkgconfig; fi
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- if [ $TRAVIS_OS_NAME == osx ]; then export PATH="/usr/local/opt/ccache/libexec:$PATH"; fi
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- if [ $TRAVIS_OS_NAME == linux ] && [ $TRAVIS_COMPILER == clang ]; then export CCACHE_CPP2=yes; fi
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install:
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- if [ $TRAVIS_OS_NAME == linux ]; then bash scripts/compile_YAML-CPP.travis; fi

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