While it is perfectly ok to define an extern(C) function in a function method, I can't seem to get pragma(mangle, "...") on it to work.

---
pragma(mangle, "Foo")    // Ok
extern(C) void foo();

void main() {
    pragma(mangle, "Bar")    // Error....
    extern(C) void bar();
}
---

Any idea why?

On Wednesday, 16 January 2019 at 19:41:04 UTC, Sebastiaan Koppe wrote:
> While it is perfectly ok to define an extern(C) function in a function method, I can't seem to get pragma(mangle, "...") on it to work.
>
> ---
> pragma(mangle, "Foo")    // Ok
> extern(C) void foo();
>
> void main() {
>     pragma(mangle, "Bar")    // Error....
>     extern(C) void bar();
> }
> ---
>
> Any idea why?

See also:

https://issues.dlang.org/show_bug.cgi?id=15843
https://issues.dlang.org/show_bug.cgi?id=17638
https://issues.dlang.org/show_bug.cgi?id=19149

On 1/16/19 2:41 PM, Sebastiaan Koppe wrote:
> While it is perfectly ok to define an extern(C) function in a function method, I can't seem to get pragma(mangle, "...") on it to work.
> 
> ---
> pragma(mangle, "Foo")    // Ok
> extern(C) void foo();
> 
> void main() {
>      pragma(mangle, "Bar")    // Error....
>      extern(C) void bar();
> }
> ---
> 
> Any idea why?

I found the same error, not too long ago.

I would note also, the error is not very good:

Error: unrecognized pragma(mangle)

Which is the same error you get if you put any unknown pragma identifier in there.

I'm guessing it's a missed case in the compiler, and not intentionally omitted.

-Steve

On Wednesday, 16 January 2019 at 19:59:02 UTC, Steven Schveighoffer wrote:
> I'm guessing it's a missed case in the compiler, and not intentionally omitted.
>
> -Steve

The workaround is quite silly. Seems like a parser issue.

---
pragma(mangle, "Foo")
    extern(C) void foo();

mixin template T()
{
    pragma(mangle, "Bar")
    extern(C) void bar();
}

void main() {
    mixin T!();    // Hurrah!
}
---