BLD add a mac run on Travis (#12824)

.travis.yml

@@ -20,7 +20,14 @@ env:
 
 matrix:
   include:
-    # This environment tests that scikit-learn can be built against
+    # Latest dependencies on macOS with MKL
+    - env: DISTRIB="conda" PYTHON_VERSION="*" INSTALL_MKL="true"
+           NUMPY_VERSION="*" SCIPY_VERSION="*" CYTHON_VERSION="*"
+           PILLOW_VERSION="*" JOBLIB_VERSION="*" COVERAGE=true
+      language: generic
+      if: type != cron
+      os: osx
+    # Linux environment to test that scikit-learn can be built against
     # versions of numpy, scipy with ATLAS that comes with Ubuntu Xenial 16.04
     # i.e. numpy 1.11 and scipy 0.17
     - env: DISTRIB="ubuntu" PYTHON_VERSION="3.5"
@@ -36,18 +43,12 @@ matrix:
             - libatlas3-base
             - libatlas-base-dev
             - libatlas-dev
-    # Python 3.5 build without SITE_JOBLIB
+    # Linux + Python 3.5 build with OpenBLAS and without SITE_JOBLIB
     - env: DISTRIB="conda" PYTHON_VERSION="3.5" INSTALL_MKL="false"
            NUMPY_VERSION="1.11.0" SCIPY_VERSION="0.17.0" CYTHON_VERSION="*"
            PILLOW_VERSION="4.0.0" COVERAGE=true
       if: type != cron
-    # Python 3.5 build
-    - env: DISTRIB="conda" PYTHON_VERSION="3.5" INSTALL_MKL="false"
-           NUMPY_VERSION="1.11.0" SCIPY_VERSION="0.17.0" CYTHON_VERSION="*"
-           PILLOW_VERSION="4.0.0" COVERAGE=true
-           SKLEARN_SITE_JOBLIB=1 JOBLIB_VERSION="0.11"
-      if: type != cron
-    # This environment tests the latest available dependencies.
+    # Linux environment to test the latest available dependencies and MKL.
     # It runs tests requiring pandas and PyAMG.
     # It also runs with the site joblib instead of the vendored copy of joblib.
     - env: DISTRIB="conda" PYTHON_VERSION="*" INSTALL_MKL="true"
@@ -57,7 +58,7 @@ matrix:
            CHECK_PYTEST_SOFT_DEPENDENCY="true" TEST_DOCSTRINGS="true"
            SKLEARN_SITE_JOBLIB=1 CHECK_WARNINGS="true"
       if: type != cron
-    # This environment tests scikit-learn against numpy and scipy master
+    # Linux environment to test scikit-learn against numpy and scipy master
     # installed from their CI wheels in a virtualenv with the Python
     # interpreter provided by travis.
     -  python: 3.7

build_tools/travis/after_success.sh

@@ -10,10 +10,10 @@ if [[ "$COVERAGE" == "true" ]]; then
     # Need to run codecov from a git checkout, so we copy .coverage
     # from TEST_DIR where pytest has been run
     cp $TEST_DIR/.coverage $TRAVIS_BUILD_DIR
-    cd $TRAVIS_BUILD_DIR
+
     # Ignore codecov failures as the codecov server is not
     # very reliable but we don't want travis to report a failure
     # in the github UI just because the coverage report failed to
     # be published.
-    codecov || echo "codecov upload failed"
+    codecov --root $TRAVIS_BUILD_DIR || echo "codecov upload failed"
 fi

build_tools/travis/install.sh

@@ -17,23 +17,33 @@ echo 'List files from cached directories'
 echo 'pip:'
 ls $HOME/.cache/pip
 
-export CC=/usr/lib/ccache/gcc
-export CXX=/usr/lib/ccache/g++
-# Useful for debugging how ccache is used
-# export CCACHE_LOGFILE=/tmp/ccache.log
-# ~60M is used by .ccache when compiling from scratch at the time of writing
-ccache --max-size 100M --show-stats
+if [ $TRAVIS_OS_NAME = "linux" ]
+then
+	export CC=/usr/lib/ccache/gcc
+	export CXX=/usr/lib/ccache/g++
+	# Useful for debugging how ccache is used
+	# export CCACHE_LOGFILE=/tmp/ccache.log
+	# ~60M is used by .ccache when compiling from scratch at the time of writing
+	ccache --max-size 100M --show-stats
+fi
 
 make_conda() {
 	TO_INSTALL="$@"
     # Deactivate the travis-provided virtual environment and setup a
     # conda-based environment instead
-    deactivate
+    # If Travvis has language=generic, deactivate does not exist. `|| :` will pass.
+    deactivate || :
 
     # Install miniconda
-    wget https://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh \
+    if [ $TRAVIS_OS_NAME = "osx" ]
+	then
+		fname=Miniconda3-latest-MacOSX-x86_64.sh
+	else
+		fname=Miniconda3-latest-Linux-x86_64.sh
+	fi
+    wget https://repo.continuum.io/miniconda/$fname \
         -O miniconda.sh
-    MINICONDA_PATH=/home/travis/miniconda
+    MINICONDA_PATH=$HOME/miniconda
     chmod +x miniconda.sh && ./miniconda.sh -b -p $MINICONDA_PATH
     export PATH=$MINICONDA_PATH/bin:$PATH
     conda update --yes conda
@@ -115,6 +125,9 @@ except ImportError:
     pass
 "
 python setup.py develop
-ccache --show-stats
+if [ $TRAVIS_OS_NAME = "linux" ]
+then
+	ccache --show-stats
+fi
 # Useful for debugging how ccache is used
 # cat $CCACHE_LOGFILE