Re: C++ aliases in <netdb.h>

[Gisle Vanem]

Pedro Alves wrote:

> Can't see how that can run fine?  The compiler will set up the call
> assuming cdecl convention, while the called function has stdcall
> convention.

I would expect the 'reinterpret_cast<type>(::getaddrinfo)' to fix that.
With this little example:
  #include <config.h>
  #include <netdb.h>
  int main (void)
  {
    struct addrinfo *res;
    gnulib_::getaddrinfo ("www.google.com", "http", NULL, &res);
    return (0);
  }

A dis-assembly shows:
  .rdata, "dr2"
  address@hidden@@address@hidden@B:  00 00 00 00
  $SG37638:  "http"
  $SG37639:  "www.google.com"

  .text, "crx4"
   _main:
   push            ebp
   mov             ebp,esp
   push            ecx
   lea             eax,-0x4[ebp]
   push            eax
   push            0x00000000
   push            $SG37638
   push            $SG37639
   mov             ecx,address@hidden@@address@hidden@B
   call            address@hidden@@QBEP6AHPBD0PBUaddrinfo@@PAPAU2@@ZXZ
   call            eax
   add             esp,0x00000010
   xor             eax,eax
   mov             esp,ebp
   pop             ebp
   ret

  address@hidden@@QBEP6AHPBD0PBUaddrinfo@@PAPAU2@@ZXZ:
   push            ebp
   mov             ebp,esp
   push            ecx
   mov             dword ptr -0x4[ebp],ecx
   mov             eax,dword ptr address@hidden
   mov             esp,ebp
   pop             ebp
   ret


Running the program shows that 'address@hidden' gets the arguments
in the right order. So '__stdcall' must be in effect.

> Are all MSVC C run time functions __stdcall, or just a few?
> It's been a long while since I used MSVC.

getaddrinfo() etc. is not a 'run time function' but a SDK functions.
Almost all functions in the Windows SDK are __stdcall. The runtime
functions are __cdecl.

-- 
--gv