How to use compiler directives to define a build flag?

is there a way to use the compiler directives to accomplish something like the following?




apparently discourse won't let me just send the flag, so here is a sentence.

that is how you do it by customizing the build invocation, but how do you do it unconditionally within the source file?

the context is:

I don't believe there is a way to do it in Swift source today.

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Every now and then when I am reaching out for it I wish we had it:

#define someSwitch

#if someSwitch
// works
// as expected
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