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The CMake build already adds -Wundef for gcc/clang. This change makes sure that
the gcc/clang Bazel builds also compile correctly with -Wundef (#3267).

PiperOrigin-RevId: 514864451
Change-Id: I7798a4a4c68d037e23625db24ee29df454367734

PiperOrigin-RevId: 511500508
Change-Id: Ib686f93d317b95ac9b9bcb0a5566500316ba1929

CXX_FLAGS should be CXXFLAGS and the quoting was wrong.
As a result, "-Werror -Wdeprecated" was not being applied.

https://cmake.org/cmake/help/latest/envvar/CXXFLAGS.html

PiperOrigin-RevId: 506656655
Change-Id: Ic5e861be3b9c32257eb9aabb845c931f3cba7122

Breaks the intended C++ version on some CI builds

PiperOrigin-RevId: 474022587
Change-Id: I41a58893802c90864e0f2cc3d15e6c169c59146d

Bazel defaults to -std=c++11 on macOS which gtest doesn't support.

from dependencies

PiperOrigin-RevId: 467244441
Change-Id: Iefa65474d8c62e7c4c942957dc8e275715076e5f

with -std=c++14 when testing with GCC 5.

PiperOrigin-RevId: 458502826
Change-Id: I83637a222b5c0a54e55d93ce7fdbc878af27b250

v1.12.x is the last branch to support C++11
Future releases will require at least C++14

PiperOrigin-RevId: 458250106
Change-Id: Ibee2248649ff3c13daaa179135887848bf730f3f

PiperOrigin-RevId: 456323043
Change-Id: I86e3d52b72b51c2d4e96f536daa7f84a52c598f5

PiperOrigin-RevId: 429400664
Change-Id: I6454cf52cb2fc616a96663823de997591b63dfae

CMake 3.22.1, and Bazel 4.2.2

PiperOrigin-RevId: 421814198
Change-Id: Ief4e39d7f077089f10afdc8d63cc1e51dc18e97f

Use newer Docker images in CI

The new floor image contains GCC 5.5.0, like the old one.

PiperOrigin-RevId: 402402465

Updates Linux docker image to use Bazel 4.1.0 and GCC 11.1
Updates Bazel dependencies
Removes the last usage of the deprecated and removed Python2

PiperOrigin-RevId: 375759184

Generalize root directory in CI scripts

PiperOrigin-RevId: 367628939

Add CI test scripts

PiperOrigin-RevId: 360931988