[Issue 20012] export inside mixin doesn't seem to work

d-bugmail at puremagic.com d-bugmail at puremagic.com
Sat Jul 27 11:41:21 UTC 2019


Ethan Watson <gooberman at gmail.com> changed:

           What    |Removed                     |Added
                 CC|                            |gooberman at gmail.com

--- Comment #26 from Ethan Watson <gooberman at gmail.com> ---
Bringing this over from my forum post.

Here's two code snippets.

export extern(C++) void fun() {}
pragma( msg, fun.mangleof );


mixin template M()
  export extern(C++) void fun() {}
mixin M!();
pragma( msg, fun.mangleof );


Both cases print the exact same mangle - _Z3funv on Linux, ?fun@@YAXXZ on

This illustrates two things:

1) extern(C++) behavior inside mixins is correct. extern(C) behavior is not.
2) pragma( mangle ) is not a catch-all workaround if you are compiling for
different architectures/operating systems with different ABIs

The Wikipedia article on name mangling[1] goes in to detail on the messy
history of mangling C functions in the Windows ecosystem, if you're worried
that using C++ as a counter-point is irrelevant.

[1] https://en.wikipedia.org/wiki/Name_mangling#C


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