digitalmars.D.bugs - [Issue 18095] New: Add support for pragma(mangle) on alias
- d-bugmail puremagic.com (27/27) Dec 17 2017 https://issues.dlang.org/show_bug.cgi?id=18095
https://issues.dlang.org/show_bug.cgi?id=18095 Issue ID: 18095 Summary: Add support for pragma(mangle) on alias declarations Product: D Version: D2 Hardware: All OS: All Status: NEW Severity: enhancement Priority: P1 Component: dmd Assignee: nobody puremagic.com Reporter: doob me.com This allows to override the mangling of a type in an alias declaration as follows: pragma(mangle, "foo") alias foo = int; static assert(foo.mangleof == "foo"); static assert(int.mangleof == "i"); Overriding the mangling of a type in an alias allows for more generic solution to get the correct mangling of `c_long/c_ulong` for C++ functions. With the current solution the compiler is looking for a struct with the name `__c_long/__c_ulong` and special cases the mangling for that particular struct. Since D doesn't have implicit conversions to structs one are also forced cast/explicitly construct a `__c_long` struct when calling a function which uses the `__c_long` type as a parameter. With an alias that's not necessary anymore. --
Dec 17 2017