GoogleTest 1.14.0: import

[ngie]

Summary

GoogleTest 1.14.0 now requires C++14 to build. Change googletest.test.inc.mk
to reflect this requirement.

Adjust the build integration logic to handle the new version of
GoogleTest (add/remove headers/sources as needed).

Tighten down warnings via CXXFLAGS.clang instead of ignoring all warnings.
Some new warnings snuck in after I did my last round of fix submissions
upstream.

Also address some overlinking added in the previous version import.

Expect WhenDynamicCastToTest.AmbiguousCast to fail

This change reapplies the expected failure from 1.10.0.

Ref: https://github.com/google/googletest/issues/2172

[emaste]

Looks reasonable

lib/googletest/tests/gtest_main/Makefile

35

what's the story behind this bit?

[ngie]

Add expected failure from 1.10.0

[ngie]

lib/googletest/tests/gtest_main/Makefile

35

what's the story behind this bit?

I was trying to reduce overlinking I added in a previous iteration. gtest_main should link gtest.

[jlduran]

As you might already know, commit 28f6c2f292806bf31230a959bc4b19d7081669a7 broke GCC 12 compilation (https://cirrus-ci.com/task/6695038801936384).
I did the lazy thing and added:

CXXFLAGS.gcc+= -Wno-error

to gmock_main/Makefile and gtest_main/Makefile, but I believe a more granular approach is also desired for GCC.