Step 4: Run Tests With CMake On All Supported Platforms

[JonathanDCohen]

See https://abseil.io/docs/cpp/platforms/platforms for more information. Practically speaking, this means that for every presubmit run with Bazel, we will also run the same tests but configuring and building with cmake and running tests with ctest.

[JonathanDCohen]

#106

[abdes]

On Visual Studio 2017 Win64:

88>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(750): error C2220: warning treated as error - no 'object' file generated
88>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(750): warning C4101: 't': unreferenced local variable
88>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(751): warning C4101: 't': unreferenced local variable
88>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(752): warning C4101: 't': unreferenced local variable
88>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(753): warning C4101: 't': unreferenced local variable
89>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(750): error C2220: warning treated as error - no 'object' file generated
89>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(750): warning C4101: 't': unreferenced local variable
89>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(751): warning C4101: 't': unreferenced local variable
89>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(752): warning C4101: 't': unreferenced local variable
89>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(753): warning C4101: 't': unreferenced local variable
88>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(754): warning C4101: 't': unreferenced local variable
88>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(755): warning C4101: 't': unreferenced local variable
88>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(756): warning C4101: 't': unreferenced local variable
88>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(757): warning C4101: 't': unreferenced local variable
88>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(758): warning C4101: 't': unreferenced local variable
88>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(759): warning C4101: 't': unreferenced local variable
88>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(762): warning C4101: 't': unreferenced local variable
88>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(763): warning C4101: 't': unreferenced local variable
88>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(764): warning C4101: 't': unreferenced local variable
88>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(765): warning C4101: 't': unreferenced local variable
88>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(766): warning C4101: 't': unreferenced local variable
88>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(767): warning C4101: 't': unreferenced local variable
88>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(768): warning C4101: 't': unreferenced local variable
88>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(769): warning C4101: 't': unreferenced local variable
89>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(754): warning C4101: 't': unreferenced local variable
89>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(755): warning C4101: 't': unreferenced local variable
89>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(756): warning C4101: 't': unreferenced local variable
89>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(757): warning C4101: 't': unreferenced local variable
89>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(758): warning C4101: 't': unreferenced local variable
89>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(759): warning C4101: 't': unreferenced local variable
89>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(762): warning C4101: 't': unreferenced local variable
89>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(763): warning C4101: 't': unreferenced local variable
89>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(764): warning C4101: 't': unreferenced local variable
89>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(765): warning C4101: 't': unreferenced local variable
89>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(766): warning C4101: 't': unreferenced local variable
89>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(767): warning C4101: 't': unreferenced local variable
89>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(768): warning C4101: 't': unreferenced local variable
89>e:\dev\projects\blocxxi\third_party\abseil-cpp\absl\types\span_test.cc(769): warning C4101: 't': unreferenced local variable
88>Done building project "span_test_bin.vcxproj" -- FAILED.

Build fails when building tests at absl::strings::span_test.cpp