system.h

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#ifdef __NeXT
/* access macros are not declared in non posix mode in unistd.h -
 don't try to use posix on NeXTstep 3.3 ! */
#include <libc.h>
#endif
 
 
#ifdef __ICC
  #define HAVE_ALLOCA_H
  //#define alloca(size) _alloca(size)
#else
/* AIX requires this to be the first thing in the file.  */ 
  #ifndef __GNUC__
    #ifdef HAVE_ALLOCA_H
      #include <alloca.h>
    #else
      #ifdef _AIX
        #pragma alloca
      #else
        #ifndef alloca /* predefined by HP cc +Olibcalls */
          char *alloca ();
        #endif
      #endif
    #endif
  #elif defined(__GNUC__) && defined(__STRICT_ANSI__)
    #define alloca __builtin_alloca
  #else
    #ifdef HAVE_ALLOCA_H
      #include <alloca.h>
    #endif
  #endif
  #ifdef _WIN32
    #define alloca _alloca
  #endif
#endif
/*@only@*/ char * xstrdup (const char *str);
 
#if HAVE_MCHECK_H && defined(__GNUC__)
#define vmefail() (fprintf(stderr, "virtual memory exhausted.\n"), exit(EXIT_FAILURE), NULL)
#define xstrdup(_str)   (strcpy((malloc(strlen(_str)+1) ? : vmefail()), (_str)))
#else
#define xstrdup(_str) strdup(_str)
#endif  /* HAVE_MCHECK_H && defined(__GNUC__) */