• Sebastiaan Koppe (12/12) Jan 16 2019 While it is perfectly ok to define an extern(C) function in a
• Sebastiaan Koppe (6/18) Jan 16 2019 See also:
• Steven Schveighoffer (9/23) Jan 16 2019 I found the same error, not too long ago.
• Sebastiaan Koppe (15/18) Jan 16 2019 The workaround is quite silly. Seems like a parser issue.

Sebastiaan Koppe <mail skoppe.eu> writes:

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?

Sebastiaan Koppe <mail skoppe.eu> writes:

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

Steven Schveighoffer <schveiguy gmail.com> writes:

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

Sebastiaan Koppe <mail skoppe.eu> writes:

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!
}
---