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digitalmars.D.bugs - [Issue 937] New: C-style variadic functions broken

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=937

           Summary: C-style variadic functions broken
           Product: D
           Version: 1.005
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Keywords: rejects-valid
          Severity: major
          Priority: P2
         Component: DMD
        AssignedTo: bugzilla digitalmars.com
        ReportedBy: tomas famolsen.dk


The code below should explain the problem sufficiently:
-------------------------------------------------------


module vararg;

// Works
void a(...)
{
    void* v = _argptr;
}

// Works
void b(char* fmt, ...)
{
    void* v = _argptr;
}

// Error: variadic functions with non-D linkage must have at least one
parameter
// which is correct
extern(C)
void c(...)
{
    void* v = _argptr;
}

// Error: undefined identifier _argptr
// vararg.d(22): Error: cannot implicitly convert expression (_argptr) of type
int to void*
// this is contrary to spec!
extern(C)
void d(char* fmt, ...)
{
    void* v = _argptr;
}

void main()
{
    a("a", 2, 3.0);
    b("b", 2, 3.0);
    c("c", 3, 3.0);
    d("c", 3, 3.0);
}


--
Feb 07 2007
next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=937






I don't think this is a bug. For extern(C) you need std.c.stdarg,
va_start..va_end..


--
Feb 09 2007
prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=937






According to the spec the _argptr variable should be available...

So it most definitely is!


--
Feb 09 2007
prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=937


Dan G. <venix1 gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |venix1 gmail.com



While working on GDC, it was found this bug still exists in 1.063.

The problem appears to be an if statement in func.c around line 811.

"parameters" is not initialized until further down in the function.  By
substituting "f->parameters" the problem is resolved.

-----------------------------------------------------------
// Original if statement
if (f->linkage == LINKd || (parameters && parameters->dim))

// Modified if statement
if (f->linkage == LINKd || (f->parameters && Parameter::dim(f->parameters)))



GDC ticket.
http://bitbucket.org/goshawk/gdc/issue/57/c-style-variadic-functions-broken

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Aug 26 2010
prev sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=937


Walter Bright <bugzilla digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |bugzilla digitalmars.com
         Resolution|                            |FIXED



13:11:53 PST ---
https://github.com/D-Programming-Language/dmd/commit/888bd52ab4d07c132c38f231dfabea648bf94cba

https://github.com/D-Programming-Language/dmd/commit/8d2bf812530f51b40fe08c9b0f526b60575ae604

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Feb 20 2011