[cfe-dev] Suggestion to enable CPU instruction extension automatically with clang-cl

[Zhaoyu Gong via cfe-dev]

Hi,

In order to use a function from some CPU instruction extension in a source
code file, a clang-cl command line option has to be used to enable the CPU
instruction extension. For example, the command line option "-maes" is used
to enable AES extension.

For Microsoft C/C++ compiler, the call to a CPU instruction extension
function signals to the compiler that the instruction extension should be
enabled.

By borrowing the idea that "using is enabling" from Microsoft C/C++
compiler, it will be easier to use clang-cl as the replacement of Microsoft
C/C++ compiler


Best,

Joe Gong
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