Initial CMake support

[itzurabhi]

5 Added CMake build files,build instructions.

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[itzurabhi]

@googlebot I signed it!

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[asteinha]

Does this solution ensure that with GCC we build the examples with -O2? Usually it makes no substantial difference, just the demonstration executes slower, but for example on ARM it makes a difference - the binary compiled without optimizations might flake or not work at all.

[itzurabhi]

Regarding the question by @asteinha , we can set CMAKE_BUILD_TYPE while building. If -O2 is required explicitly then we need to add the specific flag to the compiler options.

https://stackoverflow.com/questions/41361631/optimize-in-cmake-by-default

The above link shows a relevant example.

Which is preferred ?

[asteinha]

Regarding the question by @asteinha , we can set CMAKE_BUILD_TYPE while building. If -O2 is required explicitly then we need to add the specific flag to the compiler options.

https://stackoverflow.com/questions/41361631/optimize-in-cmake-by-default

The above link shows a relevant example.

Which is preferred ?

The release build type should be fine. -O3 should work everywhere where -O2 works. Just make sure that it works for MSVC and that it creates a Release (not Debug) build for MSVC.

[itzurabhi]

@asteinha I have changed the build instructions to have Release mode. I do not have a MSVC setup to verify the optimization level.

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[itzurabhi]

This seems good to me! One nit on a variable name.

Can you please squash your commits before merge? Thanks.

Done.

[mmdriley]

Hm, is it me?

[mmdriley]

@googlebot I consent.

[asteinha]

It might be because of the mismatch between mdriley@gmail.com and mattdr@google.com, but I'm not completely sure. You might want to try to sign the CLA with the e-mail address that is listed as the co-author of the branch to be merged. Something similar happened to once upon a time I worked in Montreal.

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[mmdriley]

Yep, googlebot is worried about Co-Authored-By: Matthew Riley <mdriley@gmail.com>.

[mmdriley]

Merged. Thank you!