cosmetic: clarify some comments, update readme

README.rst

@@ -8,7 +8,8 @@ wheels on the `AppVeyor <https://ci.appveyor.com/>`_ infrastructure.
 
 The Travis CI scripts are designed to build *and test*:
 
-* Dual architecture macOS wheels;
+* Dual 32/64-bit architecture macOS wheels built for macOS 10.6+;
+* 64-bit macOS wheels built for macOS 10.9+;
 * 64-bit ``manylinux1_x86_64`` wheels, both narrow and wide Unicode builds;
 * 32-bit ``manylinux1_i686`` wheels, both narrow and wide Unicode builds.
 
@@ -238,6 +239,10 @@ To use these scripts
           language: generic
           env:
             - MB_PYTHON_VERSION=2.7
+        - os: osx
+          env:
+            - MB_PYTHON_VERSION=2.7
+            - MB_PYTHON_OSX_VER=10.9
         - os: osx
           language: generic
           env:
@@ -250,6 +255,22 @@ To use these scripts
           language: generic
           env:
             - MB_PYTHON_VERSION=3.6
+        - os: osx
+          language: generic
+          env:
+            - MB_PYTHON_VERSION=3.6
+        - os: osx
+          language: generic
+          env:
+            - MB_PYTHON_VERSION=3.6
+            - MB_PYTHON_OSX_VER=10.9
+        # Default OSX (xcode image) is 10.13 (xcode 9.4.1) as of 2018-08-03
+        # See: https://docs.travis-ci.com/user/reference/osx/
+        - os: osx
+          osx_image: xcode10.1
+          env:
+            - PYTHON_VERSION=3.7
+            - MB_PYTHON_OSX_VER=10.9
         - os: osx
           language: generic
           env:

osx_utils.sh

@@ -305,16 +305,17 @@ function repair_wheelhouse {
     install_delocate
     delocate-wheel $wheelhouse/*.whl # copies library dependencies into wheel
     # Add platform tags to label wheels as compatible with OSX 10.9 and
-    # 10.10.  The wheels will be built against Python.org Python, and so will
-    # in fact be compatible with OSX >= 10.6 or >=10.9. pip < 6.0 doesn't realize
-    # this, so, in case users have older pip, add platform tags to specify
-    # compatibility with later OSX.  Not necessary for OSX released well
-    # after pip 6.0.  See:
+    # 10.10.  The wheels are built against Python.org Python, and so will
+    # in fact be compatible with either 10.6+ or 10.9+, depending on the value
+    # of MB_PYTHON_OSX_VER. pip < 6.0 doesn't realize this, so, in case users
+    # have older pip, add platform tags to specify compatibility with later OSX.
+    # Not necessary for OSX released well after pip 6.0.  See:
     # https://github.com/MacPython/wiki/wiki/Spinning-wheels#question-will-pip-give-me-a-broken-wheel
     if [ $MB_PYTHON_OSX_VER == "10.6" ]; then
+        # assume that 10.6-based python is dual arch (32/64-bit)
         delocate-addplat --rm-orig -x 10_9 -x 10_10 $wheelhouse/*.whl
     elif [ $MB_PYTHON_OSX_VER == "10.9" ]; then
-        # assume that 10.9 python is 64-bit arch only
+        # assume that 10.9-based python is 64-bit arch only
         delocate-addplat --rm-orig -p macosx_10_10_x86_64 $wheelhouse/*.whl
     else
         echo "Invalid python macosx version $MB_PYTHON_OSX_VER" 1>&2

tests/test_multibuild.sh

@@ -8,6 +8,7 @@ source tests/test_common_utils.sh
 source tests/test_fill_submodule.sh
 if [ -n "$IS_OSX" ]; then
     source osx_utils.sh
+    # osx_utils defines MACPYTHON_DEFAULT_OSX
     MB_PYTHON_OSX_VER=${MB_PYTHON_OSX_VER:-$MACPYTHON_DEFAULT_OSX}
     get_macpython_environment $PYTHON_VERSION $MB_PYTHON_OSX_VER $VENV
     source tests/test_python_install.sh