re-enable libsysconfcpus script in .travis.yml for compiler speedup d…

…wyl/learn-travis#31 (comment)

.travis.yml

@@ -24,22 +24,22 @@ before_install:
   # - if [ ${TRAVIS_OS_NAME} == "osx" ];
   #   then brew update; brew install nvm; mkdir ~/.nvm; export NVM_DIR=~/.nvm; source $(brew --prefix nvm)/nvm.sh;
   #   fi
-  # - | # build time improvement - 10 mins >> 5 sec! see https://git.io/vQcqz
-  #   if [ ! -d sysconfcpus/bin ];
-  #   then
-  #     git clone https://github.com/obmarg/libsysconfcpus.git;
-  #     cd libsysconfcpus;
-  #     ./configure --prefix=$TRAVIS_BUILD_DIR/sysconfcpus;
-  #     make && make install;
-  #     cd ..;
-  #   fi
+  - | # build time improvement - 10 mins >> 5 sec! see https://git.io/vQcqz
+    if [ ! -d sysconfcpus/bin ];
+    then
+      git clone https://github.com/obmarg/libsysconfcpus.git;
+      cd libsysconfcpus;
+      ./configure --prefix=$TRAVIS_BUILD_DIR/sysconfcpus;
+      make && make install;
+      cd ..;
+    fi
 
 install: # install specific versions of elm & elm-test
   - npm install -g elm@$ELM_VERSION elm-test@$ELM_TEST elm-format@exp
   # the next 3 lines are courtesy of @rtfeldman https://git.io/vbj0j
-  # - mv $(npm config get prefix)/bin/elm-make $(npm config get prefix)/bin/elm-make-old
-  # - printf "#\041/bin/bash\n\necho \"Running elm-make with sysconfcpus -n 2\"\n\n$TRAVIS_BUILD_DIR/sysconfcpus/bin/sysconfcpus -n 2 elm-make-old \"\$@\"" > $(npm config get prefix)/bin/elm-make
-  # - chmod +x $(npm config get prefix)/bin/elm-make
+  - mv $(npm config get prefix)/bin/elm-make $(npm config get prefix)/bin/elm-make-old
+  - printf "#\041/bin/bash\n\necho \"Running elm-make with sysconfcpus -n 2\"\n\n$TRAVIS_BUILD_DIR/sysconfcpus/bin/sysconfcpus -n 2 elm-make-old \"\$@\"" > $(npm config get prefix)/bin/elm-make
+  - chmod +x $(npm config get prefix)/bin/elm-make
   - travis_retry elm package install --yes # install main project dependencies
   - pwd