$CompilerEnvironment

[Experimental]

is the collection of definitions typically used by FunctionCompile and related functions.

Details

A new $CompilerEnvironment can be made with CreateCompilerEnvironment.
Typically, the $CompilerEnvironment is suitable for the platform on which the Wolfram Compiler is running.

Use the default compiler environment in a compilation:

The target system for the default environment is typically that of the host platform:

Use FunctionDeclaration with the default compiler environment:

Now there is no need to use the CompilerEnvironment option:

The default compiler environment can be restored to its default state:

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