ios_cmake_3_14 (#20055)

* ios_cmake_3_14

* disabled ios_cmake

* Update .travis.yml

change to xcode11

Author: crazyhappygame

.travis.yml

@@ -18,11 +18,11 @@ matrix:
       osx_image: xcode9.3
       sudo: required
     # iOS_cmake
-    # - os: osx
-    #   env: BUILD_TARGET=ios_cmake
-    #   language: cpp
-    #   osx_image: xcode9.3
-    #   sudo: required
+    - os: osx
+      env: BUILD_TARGET=ios_cmake
+      language: cpp
+      osx_image: xcode11
+      sudo: required
     # android cmake
     - os: linux
       env: BUILD_TARGET=android_cmake

tools/travis-scripts/before-install.sh

@@ -50,6 +50,13 @@ function install_latest_python()
     python -V
 }
 
+function install_cmake_osx()
+{
+    cmake --version
+    brew upgrade cmake
+    cmake --version
+}
+
 # set up environment according os and target
 function install_environement_for_pull_request()
 {
@@ -67,6 +74,7 @@ function install_environement_for_pull_request()
     if [ "$TRAVIS_OS_NAME" == "osx" ]; then
         install_latest_python
         install_python_module_for_osx
+        install_cmake_osx
     fi
 
     # use NDK's clang to generate binding codes
@@ -80,6 +88,7 @@ function install_environement_for_after_merge()
     if [ "$TRAVIS_OS_NAME" == "osx" ]; then
         install_latest_python
         install_python_module_for_osx
+        install_cmake_osx
     fi
 
     echo "Building merge commit ..."