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ThreadLocal class needs to be have default visibility.
Root cause is gtest uses typeinfo for the ThreadLocal class.
The problem manifests When gtest/gmock are built as a shared library
with libc++. When a class is used in typeinfo, it must have default
visibility.

There is an explanation about typeinfo and visibility here:
https://developer.apple.com/library/content/documentation/DeveloperTools/Conceptual/CppRuntimeEnv/Articles/SymbolVisibility.html

When libc++ is used with gtest in shared library mode, any tests
that are compiled with -fvisibility=hidden and exercise the
macro EXPECT_CALL, it results in an abort like:
[ FATAL ] /usr/include/gtest/internal/gtest-port.h:1394::
Condition typeid(*base) == typeid(Derived) failed.
This is because the typeinfo for ThreadLocal class is not visible.
Therefore, linker failed to match it to the shared library symbol, creating a
new symbol instead.

This fixes https://github.com/google/googletest/issues/1207.

TempDir() function is declared twice, once in `internal/gtest-port.h`
and a second time in `gtest.h`.

Fixes a warning with GCC when -Wredundant-decls is given.

Infinite Loop when calling a mock function that takes boost::filesystem::path as parameter #521: Add is_same type trait and prevent infinite loops for recursive containers

Infinite Loop when calling a mock function that takes boost::filesystem::path as parameter #521: Add is_same type trait

NetBSD is a modern UNIX-like Operating System.

Enable GTEST_HAS_PTHREAD and GTEST_HAS_DEATH_TEST on NetBSD.

This makes it possible for a port to define the specifier used for
exported symbols without having to change Google Test.

Fixes #1076.

Fixes the following errors:

hash_map(17): error C2338: <hash_map> is deprecated and will be REMOVED. Please use <unordered_map>. You can define _SILENCE_STDEXT_HASH_DEPRECATION_WARNINGS to acknowledge that you have received this warning. [googlemock\gtest\gtest-printers_test.vcxproj]
hash_set(17): error C2338: <hash_set> is deprecated and will be REMOVED. Please use <unordered_set>. You can define _SILENCE_STDEXT_HASH_DEPRECATION_WARNINGS to acknowledge that you have received this warning. [googlemock\gtest\gtest-printers_test.vcxproj]
googletest\test\gtest_catch_exceptions_test_.cc(152): error C2220: warning treated as error - no 'object' file generated
googletest\test\gtest_catch_exceptions_test_.cc(152): warning C4297: 'CxxExceptionInDestructorTest::~CxxExceptionInDestructorTest': function assumed not to throw an exception but does
  googletest\test\gtest_catch_exceptions_test_.cc(152): note: destructor or deallocator has a (possibly implicit) non-throwing exception specification

There were already some checks for _MSC_VER in the code, so this commit
continues in that vein.

googletest doesn't currently build with clang's very aggressive
-Wformat-nonliteral warning. It requires that all non-literal format
strings come from the argument of a function annotated with a compatible
format attribute.

Fixing that reports that ColoredPrintf's callers weren't passing the
normal -Wformat warning. Some messages were passed directly into the
format string rather than via "%s".

This was not in Gingerbread for anything but ARM (even though the
libs were hacked to lie about it being available in gingerbread).

If $XML_OUTPUT_FILE is set, and $GTEST_OUTPUT and --gtest_output are not
specified, produce output as if GTEST_OUTPUT=xml:$XML_OUTPUT_FILE had
been set.

As repository moved to github. All urls need to be changed. There is
still plenty to do.

This is to enable using gtest with -fvisibility=hidden.

This guards use of <type_traits> and its features with
GTEST_HAS_STD_TYPE_TRAITS_, and std::function with
GTEST_HAS_STD_FUNCTION_.

custom/gtest-port.h.