[Issue 3252] New: undefined reference to package function called from an interface

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=3252

           Summary: undefined reference to package function called from an
                    interface
           Product: D
           Version: 1.045
          Platform: x86
        OS/Version: Linux
            Status: NEW
          Keywords: link-failure
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: diggory.hardy at gmail.com


When attempting to call a function with package protection level from an
interface, I get an undefined reference error.


Code:

/** Compiler error - calling a package interface function.
 */
module packageFunc;

interface I {
    package void iPack();
}
class A : I {
    package void iPack() {}
}

void main () {
    A a = new A;
    I i = a;
    i.iPack;    // causes an undefined reference
    (cast(A) i).iPack;  // a workaround
}


The linker error:
# dmd packageFunc.d
packageFunc.o: In function `_Dmain':
packageFunc.d:(.text._Dmain+0x22): undefined reference to
`_D11packageFunc1I5iPackMFZv'
collect2: ld returned 1 exit status
--- errorlevel 1


Possibly similar to bug 2894.

This just bit me when including package protection to a lot of class functions
in order to implement invariant tests (where package protection is the only
applicable type of protection). I presume it's a bug; haven't tested if it's
also the case with dmd 2.0 or other compilers yet. Any idea if it would be
simple to fix?

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