echos for debug purposes

.travis.yml

@@ -635,16 +635,20 @@ before_install: |
     # Multibuild doesn't have releases, so --depth would break eventually (see
     # https://superuser.com/questions/1240216/server-does-not-allow-request-for-unadvertised)
     git submodule update --init multibuild
+    echo "Source multibuild/common_utils.sh"
     source multibuild/common_utils.sh
     # https://github.com/matthew-brett/multibuild/issues/116
     if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then export ARCH_FLAGS=" "; fi
+    echo "Source multibuild/travis_steps.sh"
     source multibuild/travis_steps.sh
     # This sets -x
+    echo "Source travis_multibuild_customize.sh"
     source travis_multibuild_customize.sh
     echo $ENABLE_CONTRIB > contrib.enabled
     echo $ENABLE_HEADLESS > headless.enabled
 
     if [ -n "$IS_OSX" ]; then
+        echo "homebrew"
         TAPS="$(brew --repository)/Library/Taps"
         if [ -e "$TAPS/caskroom/homebrew-cask" -a -e "$TAPS/homebrew/homebrew-cask" ]; then
             rm -rf "$TAPS/caskroom/homebrew-cask"
@@ -658,7 +662,7 @@ before_install: |
 
         brew_cache_cleanup
     fi
-
+    echo "end"
     # Not interested in travis internal scripts' output
     set +x