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Asked: 2026-06-01T08:53:57+00:00

I’m trying to use the Metakit library latest update, but I always get an

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I’m trying to use the Metakit library latest update, but I always get an Undefined reference in this piece of code:

bool c4_FileStrategy::DataOpen(const char *fname_, int mode_) {
  d4_assert(!_file);

#if q4_WIN32 && !q4_BORC && !q4_WINCE
  int flags = _O_BINARY | _O_NOINHERIT | (mode_ > 0 ? _O_RDWR : _O_RDONLY);
  int fd =  - 1;

  if (GetPlatformId() != VER_PLATFORM_WIN32_NT)
    fd = _open(fname_, flags);
  if (fd ==  - 1) {
    WCHAR wName[MAX_PATH];
    MultiByteToWideChar(CP_UTF8, 0, fname_,  - 1, wName, MAX_PATH);
    fd = _wopen(wName, flags);
  }
  if (fd !=  - 1)
    _cleanup = _file = _fdopen(fd, mode_ > 0 ? "r+b" : "rb");
#else 
  _cleanup = _file = fopen(fname_, mode_ > 0 ? "r+b" : "rb");
#if q4_UNIX
  if (_file != 0)
    fcntl(fileno(_file), F_SETFD, FD_CLOEXEC);
#endif //q4_UNIX
#endif //q4_WIN32 && !q4_BORC && !q4_WINCE

The strange thing (for me) is that, I get this linker error on this line: fcntl(fileno(_file), F_SETFD, FD_CLOEXEC); witch is used only for Linux. The #else part appears in gray, so I thought that code never compiles, so why do I get this undefined reference then ?

Any thoughts ?

PS: with my current older version I have no problem (2.4.6).

edit: I am on Windows and using Tornado (unfornatelly)

edit 2: this is how q4_UNIX is defiend:

#if defined (__MINGW32__)
#define d4_OS_H "win.h"
#elif defined (MSDOS) && defined (__GNUC__)
#define q4_DOS 1
#elif defined(unix) || defined(__unix__) || defined(__GNUC__) || \
defined(_AIX) || defined(__hpux)
#define q4_UNIX 1
#elif defined (__VMS)
#define q4_VMS 1
#elif defined (macintosh)
#define q4_MAC 1
#elif !defined (d4_OS_H)
#define d4_OS_H "win.h"
#endif
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1 Answer

  1. Editorial Team

    You say you are on Windows. This means that this line:

    fcntl(fileno(_file), F_SETFD, FD_CLOEXEC);

    should never have been compiled. This means that the #ifdef‘s are flawed.

    You have three options for fixing:

    1. Fix the defines so that this doesn’t get compiled and gets preprocessed out instead.

    2. Comment out the offending lines manually.

    3. Try including <fcntl.h>, which might fix the issue. That is assuming you even have <fcntl.h>.

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