fixing openssl linking on osx

.travis.yml

@@ -19,10 +19,10 @@ addons:
       - gcc@7
       - curl-openssl
 
-after_install:
-  - CC=gcc-7 && CXX=g++-7
 
 before_script:
+  - export CC="$(which -- gcc-7)" CXX="$(which -- g++-7)"
+  - if [ ${TRAVIS_OS_NAME} = "osx" ]; then ln -s /usr/local/opt/openssl/include/openssl /usr/local/include; fi
   - mkdir -p ${TRAVIS_BUILD_DIR}/vendor/sqlite/build && cd ${TRAVIS_BUILD_DIR}/vendor/sqlite/build && cmake -D BUILD_SHARED_LIBS=1 ..
   - cd ${TRAVIS_BUILD_DIR}/vendor/sqlite/build && make
 

CMakeLists.txt

@@ -48,8 +48,11 @@ if(COUNTLY_USE_SQLITE)
   target_include_directories(countly PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/vendor/sqlite)
   target_link_libraries(countly sqlite3)
   if (APPLE)
-    target_include_directories(countly PRIVATE /usr/local/opt/openssl/include)
+    set(OPENSSL_ROOT_DIR "/usr/local/opt/openssl")
   endif()
+  find_package(OpenSSL REQUIRED)
+  target_include_directories(countly PRIVATE ${OPENSSL_INCLUDE_DIRS})
+  target_link_libraries(countly ${OPENSSL_LIBRARIES})
 endif()
 
 if(COUNTLY_BUILD_TESTS)
@@ -63,4 +66,8 @@ if(COUNTLY_BUILD_TESTS)
   target_include_directories(countly-tests PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/vendor/doctest/doctest)
   target_include_directories(countly-tests PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/vendor/json/include)
   target_link_libraries(countly-tests countly)
+  set_target_properties(countly-tests PROPERTIES
+    CXX_STANDARD 11
+    CXX_STANDARD_REQUIRED YES
+    CXX_EXTENSIONS NO)
 endif()