[travis] Fix unit tests on Mac.

- Use libc++ instead of libstdc++ in the conan profile
- Add CMAKE_OPTIONS for Mac

.travis.yml

@@ -13,7 +13,7 @@ matrix:
     - os: osx
       osx_image: xcode9
       compiler: clang
-      env: PYTHON=3.6.2
+      env: PYTHON=3.6.2 CMAKE_OPTIONS="-DCMAKE_BUILD_TYPE=Release -DEXIV2_ENABLE_VIDEO=ON -DEXIV2_ENABLE_WEBREADY=ON -DEXIV2_BUILD_UNIT_TESTS=ON" # All enabled
 
 env:
     #- CMAKE_OPTIONS="-DCMAKE_BUILD_TYPE=Release" # Default

.travis/install.sh

@@ -40,6 +40,6 @@ if [[ "$(uname -s)" == 'Linux' ]]; then
         printf "[settings]\nos=Linux\narch=x86_64\ncompiler=gcc\ncompiler.version=4.8\ncompiler.libcxx=libstdc++\nbuild_type=Release\n" > ~/.conan/profiles/release
     fi
 else
-    printf "[settings]\nos=Macos\narch=x86_64\ncompiler=apple-clang\ncompiler.version=9.0\ncompiler.libcxx=libstdc++\nbuild_type=Release\n" > ~/.conan/profiles/release
+    printf "[settings]\nos=Macos\narch=x86_64\ncompiler=apple-clang\ncompiler.version=9.0\ncompiler.libcxx=libc++\nbuild_type=Release\n" > ~/.conan/profiles/release
 fi
 

.travis/run.sh

@@ -19,10 +19,5 @@ cmake ${CMAKE_OPTIONS} -DCMAKE_INSTALL_PREFIX=install ..
 make -j2
 make tests
 make install
-
-# Only run unit tests on Linux for the moment
-# TODO: Check what is happening on Mac
-if [[ "$(uname -s)" == 'Linux' ]]; then
 cd bin
 ./unit_tests
-fi