* Google Benchmark now works with OpenMP and other user-managed threading.

Summary:
- When google benchmark is used as a submodule in a parent projects
  whose min CMake version is 3.3.2 or later, the google benchmark
  `CMakeLists.txt` triggers a warning regarding CMake policy 0063:

```
CMake Warning (dev) at tests/googlebenchmark/src/CMakeLists.txt:19 (add_library):
  Policy CMP0063 is not set: Honor visibility properties for all target
  types.  Run "cmake --help-policy CMP0063" for policy details.  Use the
  cmake_policy command to set the policy and suppress this warning.

  Target "benchmark" of type "STATIC_LIBRARY" has the following visibility
  properties set for CXX:

    CXX_VISIBILITY_PRESET
    VISIBILITY_INLINES_HIDDEN

  For compatibility CMake is not honoring them for this target.
This warning is for project developers.  Use -Wno-dev to suppress it.
```

- Set CMake Policy 0063 to NEW if the policy is available. This will not
  affect parent projects who include benchmark but do not have a CMake min
  version of 3.3.2 or later, i.e. when this policy is introduced.

* Add FIXME in multiple_ranges_test.cc

* Improve handling of large bounds in AddRange.

Due to breaking the loop too early, AddRange
would miss a final multplier of 'mult' that
was within the numeric range of T.

* Enable negative values for Range argument

Fixes #762.

* Try to fix build of benchmark_gtest

* Try some more to fix build

* Attempt to fix format macros

* Attempt to resolve format errors for mingw32

* Review feedback

Put unit tests in benchmark::internal namespace

Fix error reporting in multiple_ranges_test.cc

* [JSON] add threads and repetitions to the json output, for better ide…
[Tests] explicitly check for thread == 1
[Tests] specifically mark all repetition checks
[JSON] add repetition_index reporting, but only for non-aggregates (i…

* [Formatting] Be very, very explicit about pointer alignment so clang-format can not put pointers/references on the wrong side of arguments.
[Benchmark::Run] Make sure to use explanatory sentinel variable rather than a magic number.

* Do not pass redundant information

It broke because the libc++ is being built as part of *this*
build, with old gcc+libstdc++ (4.8?), but LLVM is preparing
to switch to C++14, and gcc+libstdc++ <5 are soft-deprecated.

Just the gcc update doesn't cut it, clang still uses old libstdc++.

Created BenchmarkName class which holds the full benchmark
name and allows specifying and retrieving different components
of the name (e.g. ARGS, THREADS etc.)

Fixes #730.

Refs #779.

Run into this by accident while writing benchmark to validate
the fix for https://bugs.llvm.org/show_bug.cgi?id=40965

Fixes #779.

- On qnx platform, cpu and cache info is stored in a syspage struct which
  is different from other OS platform.
- The fix has been verified on an aarch64 target running qnx 7.0.
Fixes #774

Since googletest already supports x-compilation for QNX, it is nice to
 have google benchmark support it too.
Fixes #766

Since pthread is required at least for GCC (according to the
documentation), this should be reflected by the pkg-config file.

The same is, for instance, also done by the gflags library:
https://github.com/gflags/gflags/blob/1005485222e8b0feff822c5723ddcaa5abadc01a/cmake/package.pc.in#L13

Commit 17a012d7 added a newline to the str, so the line built from
str.length() is one character longer than it should be.

If this policy isn't set, CMake emits a large warning when project() is
called from a cmake subdirectory.

This came up when the benchmark library was added to the LLVM build, and
it was reported in https://llvm.org/PR38874. This patch was the fix I
applied locally to fix the issue, and I wanted to send it upstream.

Some benchmarks are particularly sensitive and they run in less than
a nanosecond. In order for the console reporter to provide meaningful
output for such benchmarks it needs to be able to display the times
using more resolution than a single nanosecond.

This patch changes the console reporter to print at least three
significant digits for all results.

Unlike the initial attempt, this patch does not align the decimal point.

As pointed out in IRC, these are not documented.

It should now match reality.

* Adding Host Name and test

* Addressing Review Comments

* Adding Test for JSON Reporter

* Adding HOST_NAME_MAX for MacOS systems

* Adding Explaination for MacOS HOST_NAME_MAX Addition

* Addressing Peer Review Comments

* Adding codecvt in windows header guard

* Changing name SystemInfo and adding empty message incase host name fetch fails

* Adding Comment on Struct SystemInfo

Unit-tests fail to build due to the following errors:

/home/cfx/Dev/google-benchmark/benchmark.git/test/string_util_gtest.cc:12:5: required from here
/home/cfx/Applications/googletest-1.8.1/include/gtest/gtest.h:1444:11: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
   if (lhs == rhs) {
       ~~~~^~~~~~

Fixes #741

std::tmpnam is deprecated and its use is discouraged. For our purposes
in the tests, we really just need a file name which is unlikely to
exist.

This patch converts the tests to using a dummy random file name
generator, which should hopefully avoid name conflicts.

Fixes #714.

Used that example as a snippet, and it took a moment to notice
what needed to be changed to make it compile..

This is the copy of patch proposed to LLVM's copy of benchmark via
https://reviews.llvm.org/D52998.

s390 has another line structure for processor-field.
It should be differently parsed.

It is incorrect to say that an aggregate is computed over
run's iterations, because those iterations already got averaged.
Similarly, if there are N repetitions with 1 iterations each,
an aggregate will be computed over N measurements, not 1.
Thus it is best to simply use the count of separate reports.

Fixes #586.