[Issue 18095] New: Add support for pragma(mangle) on alias declarations
d-bugmail at puremagic.com
d-bugmail at puremagic.com
Sun Dec 17 17:06:42 UTC 2017
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 at puremagic.com
Reporter: doob at 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.
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