Bug 19669 – There is no way for code to detect whether -dip1000 is enabled or not

Currently, there is no way for code to tell whether the -dip1000 switch has been passed to the compiler. This makes it harder to write code that needs to do something different depending on whether dip1000 is in effect or not, and in my opinion, is REQUIRED for any non-trivial code base that wants/has to support legacy compiler versions. There is a hacky workaround: static assert(!__traits(compiles, { char[] f() { char[2] x; return x[].splitterASCII!(_ => _ == ' ').front; } })); But it would be far preferable to be able to use `version(dip1000)` or `static if (dip1000)`.

For reference and completeness, here's a better example of what you can do already to detect dip1000: ```d void main() { enum isDIP1000 = __traits(compiles, () @safe { int x; int* p; p = &x; }); pragma(msg, isDIP1000); } ``` normal: https://run.dlang.io/is/RID7vh -dip1000: https://run.dlang.io/is/1yJfVQ

IMO, https://dlang.org/spec/traits.html#getTargetInfo should be able to give you all specified compiler flags, not just -dip1000.

(In reply to ZombineDev from comment #2) > IMO, https://dlang.org/spec/traits.html#getTargetInfo should be able to give > you all specified compiler flags, not just -dip1000. That would be an enhancement request. Seb has shown how to reliably detect if -dip1000 is thrown, so this issue is resolved. (In general, doing things in the existing language is better than adding more features.)