[README] Update optimized build instructions #1437
Merged
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Add instructions for optimized builds that work across Windows (MSVC) and Unix (Linux/macOS, using GCC/Clang).
Add log messages to CMakeLists.txt that prints out
CMAKE_CXX_FLAGS_DEBUG
andCMAKE_CXX_FLAGS_RELEASE
. This seems to work on all platforms that I tested and profile useful information about the flags used by the underlying toolchain.Fixes #1432