message: CMakeLists.txt: make gtest build with GCC
diff: @@ -8,7 +8,7 @@ set(CMAKE_CXX_FLAGS_DEBUG "-DDEBUG")
  # We want C++11 and lots of warnings.
  if(NOT MSVC)
  # Clang and GCC
  - add_definitions("-std=c++11 -Wall -Wextra -Weffc++ -Werror")
  + add_definitions("-std=c++11 -Wall -Wextra -Werror")
  set(threads "pthread")
  else()
  # MSBuild
  @@ -96,6 +96,9 @@ if(NOT IOS AND NOT ANDROID)
  add_subdirectory(libs/gtest)
  include_directories(libs/gtest/googletest/include)
  + # gtest has these warnings
  + add_definitions("-Wno-sign-compare")
  +
  add_executable(unit_tests_runner
  src/global_include_test.cpp
  src/mavlink_channels_test.cpp
  