Examples of errors detected by the V1040 diagnostic

V1040. Possible typo in the spelling of a pre-defined macro name.

Erlang

V1040 Possible typo in the spelling of a pre-defined macro name. The '__WIN_32__' macro is similar to '__WIN32__'. inet_drv.c 13506

static int tcp_send_error(tcp_descriptor* desc, int err)
{
   /* EPIPE errors usually occur in one of three ways:
    * 1. We write to a socket when we've already shutdown() the write side.
    *    On Windows the error returned for this is ESHUTDOWN
    *    rather than EPIPE.
    * 2. The TCP peer sends us an RST through no fault of our own (perhaps
    *    by aborting the connection using SO_LINGER) and we then attempt
    *    to write to the socket. On Linux and Windows we would actually
    *    receive an ECONNRESET error for this, but on the BSDs, Darwin,
    *    Illumos and presumably Solaris, it's an EPIPE.
    * 3. We cause the TCP peer to send us an RST by writing to a socket
    *    after we receive a FIN from them. Our first write will be
    *    successful, but if the they have closed the connection (rather
    *    than just shutting down the write side of it) this will cause their
    *    OS to send us an RST. Then, when we attempt to write to the socket
    *    a second time, we will get an EPIPE error. On Windows we get an
    *    ECONNABORTED.
    *
    * What we are going to do here is to treat all EPIPE messages that aren't
    * of type 1 as ECONNRESET errors. This will allow users who have the
    * show_econnreset socket option enabled to receive {error, econnreset} on
    * both send and recv operations to indicate that an RST
    * has been received.
    */
#ifdef __WIN_32__   // <=
  if (err == ECONNABORTED)
    err = ECONNRESET;
#endif
  if (err == EPIPE && !(desc->tcp_add_flags & TCP_ADDF_SHUTDOWN_WR_DONE))
    err = ECONNRESET;
  return tcp_send_or_shutdown_error(desc, err);
}

SimpleIni

V1040 Possible typo in the spelling of a pre-defined macro name. The '_linux' macro is similar to '__linux'. SimpleIni.h 2923

#if defined(SI_NO_MBSTOWCS_NULL) || (!defined(_MSC_VER) && !defined(_linux))

libuv

V1040 Possible typo in the spelling of a pre-defined macro name. The '__MINGW32_' macro is similar to '__MINGW32__'. winapi.h 4112

/* from winternl.h */
#if !defined(__UNICODE_STRING_DEFINED) && defined(__MINGW32_)
#define __UNICODE_STRING_DEFINED
#endif