add -std=c++11 back and change to Xcode 8

Author: skvark

.travis.yml

@@ -30,35 +30,35 @@ matrix:
     # default builds for MacOS
     - os: osx
       language: generic
-      osx_image: xcode9.2
+      osx_image: xcode8
       env:
         - MB_PYTHON_VERSION=2.7
         - ENABLE_CONTRIB=0
         - ENABLE_HEADLESS=0
     - os: osx
       language: generic
-      osx_image: xcode9.2
+      osx_image: xcode8
       env:
         - MB_PYTHON_VERSION=3.4
         - ENABLE_CONTRIB=0
         - ENABLE_HEADLESS=0
     - os: osx
       language: generic
-      osx_image: xcode9.2
+      osx_image: xcode8
       env:
         - MB_PYTHON_VERSION=3.5
         - ENABLE_CONTRIB=0
         - ENABLE_HEADLESS=0
     - os: osx
       language: generic
-      osx_image: xcode9.2
+      osx_image: xcode8
       env:
         - MB_PYTHON_VERSION=3.6
         - ENABLE_CONTRIB=0
         - ENABLE_HEADLESS=0
     - os: osx
       language: generic
-      osx_image: xcode9.2
+      osx_image: xcode8
       env:
         - MB_PYTHON_VERSION=3.7
         - ENABLE_CONTRIB=0
@@ -67,35 +67,35 @@ matrix:
     # headless builds for MacOS
     - os: osx
       language: generic
-      osx_image: xcode9.2
+      osx_image: xcode8
       env:
         - MB_PYTHON_VERSION=2.7
         - ENABLE_CONTRIB=0
         - ENABLE_HEADLESS=1
     - os: osx
       language: generic
-      osx_image: xcode9.2
+      osx_image: xcode8
       env:
         - MB_PYTHON_VERSION=3.4
         - ENABLE_CONTRIB=0
         - ENABLE_HEADLESS=1
     - os: osx
       language: generic
-      osx_image: xcode9.2
+      osx_image: xcode8
       env:
         - MB_PYTHON_VERSION=3.5
         - ENABLE_CONTRIB=0
         - ENABLE_HEADLESS=1
     - os: osx
       language: generic
-      osx_image: xcode9.2
+      osx_image: xcode8
       env:
         - MB_PYTHON_VERSION=3.6
         - ENABLE_CONTRIB=0
         - ENABLE_HEADLESS=1
     - os: osx
       language: generic
-      osx_image: xcode9.2
+      osx_image: xcode8
       env:
         - MB_PYTHON_VERSION=3.7
         - ENABLE_CONTRIB=0
@@ -104,35 +104,35 @@ matrix:
     # Contrib builds for MacOS
     - os: osx
       language: generic
-      osx_image: xcode9.2
+      osx_image: xcode8
       env:
         - MB_PYTHON_VERSION=2.7
         - ENABLE_CONTRIB=1
         - ENABLE_HEADLESS=0
     - os: osx
       language: generic
-      osx_image: xcode9.2
+      osx_image: xcode8
       env:
         - MB_PYTHON_VERSION=3.4
         - ENABLE_CONTRIB=1
         - ENABLE_HEADLESS=0
     - os: osx
       language: generic
-      osx_image: xcode9.2
+      osx_image: xcode8
       env:
         - MB_PYTHON_VERSION=3.5
         - ENABLE_CONTRIB=1
         - ENABLE_HEADLESS=0
     - os: osx
       language: generic
-      osx_image: xcode9.2
+      osx_image: xcode8
       env:
         - MB_PYTHON_VERSION=3.6
         - ENABLE_CONTRIB=1
         - ENABLE_HEADLESS=0
     - os: osx
       language: generic
-      osx_image: xcode9.2
+      osx_image: xcode8
       env:
         - MB_PYTHON_VERSION=3.7
         - ENABLE_CONTRIB=1
@@ -141,35 +141,35 @@ matrix:
     # headless contrib builds for MacOS
     - os: osx
       language: generic
-      osx_image: xcode9.2
+      osx_image: xcode8
       env:
         - MB_PYTHON_VERSION=2.7
         - ENABLE_CONTRIB=1
         - ENABLE_HEADLESS=1
     - os: osx
       language: generic
-      osx_image: xcode9.2
+      osx_image: xcode8
       env:
         - MB_PYTHON_VERSION=3.4
         - ENABLE_CONTRIB=1
         - ENABLE_HEADLESS=1
     - os: osx
       language: generic
-      osx_image: xcode9.2
+      osx_image: xcode8
       env:
         - MB_PYTHON_VERSION=3.5
         - ENABLE_CONTRIB=1
         - ENABLE_HEADLESS=1
     - os: osx
       language: generic
-      osx_image: xcode9.2
+      osx_image: xcode8
       env:
         - MB_PYTHON_VERSION=3.6
         - ENABLE_CONTRIB=1
         - ENABLE_HEADLESS=1
     - os: osx
       language: generic
-      osx_image: xcode9.2
+      osx_image: xcode8
       env:
         - MB_PYTHON_VERSION=3.7
         - ENABLE_CONTRIB=1

setup.py

@@ -137,6 +137,7 @@ def main():
     if sys.platform == 'darwin':
         cmake_args.append("-DWITH_LAPACK=OFF")  # Some OSX LAPACK fns are incompatible, see
                                                 # https://github.com/skvark/opencv-python/issues/21
+        cmake_args.append("-DCMAKE_CXX_FLAGS=-std=c++11")  # enable c++11 explicitly for clang
 
     if sys.platform.startswith('linux'):
         cmake_args.append("-DWITH_IPP=OFF")   # https://github.com/opencv/opencv/issues/10411