Bug 21206 – ICE when argument or return value is string type in extern(C++) functions

Code: ---------------------------------- extern(C++) void Foo(string arg) {} void main() {} ---------------------------------- Error: Internal Compiler Error: type string cannot be mapped to C++ ---------------------------------- Both in run.dlang.io and Windows DMD32 v2.93.1 the error is show The following code: ---------------------------------- import std.stdio; extern(C++) struct Obj { string toString() { return "ret"; } } void main() { Obj obj1; writefln("%s", obj1); } ---------------------------------- Generates error only on Windows DMD32 v2.93.1, but not in run.dlang.io. Adding extern(D) to the toString() fixes the error.

The reason for the different behaviour with string argument is that there's cppmangle.d for Posix and cppmanglewin.d for Windows. There's an old PR for both issues: https://github.com/dlang/dmd/pull/8120

*** This issue has been marked as a duplicate of issue 16575 ***