.travis.yml: move cache flushing to early common phase

We shall be adding more common early setup in a future commit.
Signed-off-by: NAlex Bennée <alex.bennee@linaro.org>
Reviewed-by: NPhilippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: NPhilippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200203090932.19147-11-alex.bennee@linaro.org>

.travis.yml

@@ -82,11 +82,16 @@ git:
   # we want to do this ourselves
   submodules: false
 
+# Common first phase for all steps
+before_install:
+  - if command -v ccache ; then ccache --zero-stats ; fi
 
+# Configure step - may be overridden
 before_script:
-  - if command -v ccache ; then ccache --zero-stats ; fi
   - mkdir -p ${BUILD_DIR} && cd ${BUILD_DIR}
   - ${SRC_DIR}/configure ${BASE_CONFIG} ${CONFIG} || { cat config.log && exit 1; }
+
+# Main build & test - rarely overridden - controlled by TEST_CMD
 script:
   - BUILD_RC=0 && make -j3 || BUILD_RC=$?
   - if [ "$BUILD_RC" -eq 0 ] ; then travis_retry ${TEST_CMD} ; else $(exit $BUILD_RC); fi
@@ -268,7 +273,6 @@ matrix:
       before_script:
         - brew link --overwrite python
         - export PATH="/usr/local/opt/ccache/libexec:$PATH"
-        - if command -v ccache ; then ccache --zero-stats ; fi
         - mkdir -p ${BUILD_DIR} && cd ${BUILD_DIR}
         - ${SRC_DIR}/configure ${BASE_CONFIG} ${CONFIG} || { cat config.log && exit 1; }
 
@@ -499,9 +503,6 @@ matrix:
         - TEST_CMD="make install -j3"
         - QEMU_VERSION="${TRAVIS_TAG:1}"
         - CACHE_NAME="${TRAVIS_BRANCH}-linux-gcc-default"
-      before_script:
-        - command -v ccache && ccache --zero-stats
-        - mkdir -p ${BUILD_DIR} && cd ${BUILD_DIR}
       script:
         - make -C ${SRC_DIR} qemu-${QEMU_VERSION}.tar.bz2
         - ls -l ${SRC_DIR}/qemu-${QEMU_VERSION}.tar.bz2