• via Digitalmars-d-bugs (41/41) Jan 04 2015 https://issues.dlang.org/show_bug.cgi?id=13932

via Digitalmars-d-bugs <digitalmars-d-bugs puremagic.com> writes:

https://issues.dlang.org/show_bug.cgi?id=13932

          Issue ID: 13932
           Summary: c++ mangling for template negative int parameter
           Product: D
           Version: D2
          Hardware: x86
                OS: Mac OS X
            Status: NEW
          Keywords: link-failure
          Severity: normal
          Priority: P1
         Component: DMD
          Assignee: nobody puremagic.com
          Reporter: schveiguy yahoo.com

When linking with C++ code that uses a negative integer as a template
parameter, D will fail to link because it outputs e.g. '-1' instead of 'n1' as
required by ABI.

Example:

C++:

template <int x> struct S
{
    int member;
};

void func(S<-1> s) {}

D:

struct S(int x)
{
    int member;
}

extern(C++) void func(S!(-1) s);

void main()
{
    func(S!(-1)(0));
}

result:

Undefined symbols for architecture x86_64:
  "__Z4func1SILi-1EE", referenced from:
      __Dmain in testcpp1.o

I don't know what platforms other than OSX this causes a problem on.

I am working on a pull that fixes this, will post soon.

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