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Prevent a collision with the system's '#define errno ...' by guarding the variable declaration.

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include/my_sys.h:
  There are platforms which use '#define errno ...' and then cause a collision with
  'extern int errno;', one example is OpenBSD.
  Rather than treat them explicitly by the 'HAVE_ERRNO_AS_DEFINE', we can check for these
  by using '#ifndef errno'.
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unknown 2005-03-03 12:35:39 +01:00
commit 5841c6309a
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include/my_sys.h
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@ -206,11 +206,13 @@ void __CDECL hfree(void *ptr);
#endif
#endif /* MSDOS */
#ifndef errno /* did we already get it? */
#ifdef HAVE_ERRNO_AS_DEFINE
#include <errno.h> /* errno is a define */
#else
extern int errno; /* declare errno */
#endif
#endif /* #ifndef errno */
extern char NEAR errbuff[NRERRBUFFS][ERRMSGSIZE];
extern char *home_dir; /* Home directory for user */
extern char *my_progname; /* program-name (printed in errors) */