Commit 35b4cf28b4 for openssl.org

commit 35b4cf28b4492e9a062733b159cbb7c8a708859c
Author: Milan Broz <gmazyland@gmail.com>
Date:   Fri Mar 27 10:40:35 2026 +0100

    Silence MINGW warning about INVALID_SOCKET

    On Windows, SOCKET is defined as unsigned (UINT_PTR).

    In OpenSSL, the socket abstraction uses int, see
    discussion in https://github.com/openssl/openssl/issues/7282.

    MINGW for some time uses a signed definition of INVALID_SOCKET,
    then switched back to unsigned, see for example
    https://sourceforge.net/p/mingw-w64/discussion/723797/thread/71522d10/
    Currently, it is defined as unsigned, creating many warnings like

      warning: overflow in conversion from 'long long unsigned int' to 'int'
      changes value from '18446744073709551615' to '-1' [-Woverflow]
      *sock = INVALID_SOCKET;

    As we use INVALID_SOCKET only in our code, we can safely silence
    this warning just by redefining INVALID_SOCKET to signed
    (version that is commented out in MINGW headers).

    While this is only a workaround, it has been here for years and
    allows focus on more important warnings.

    Signed-off-by: Milan Broz <gmazyland@gmail.com>

    Reviewed-by: Neil Horman <nhorman@openssl.org>
    Reviewed-by: Saša Nedvědický <sashan@openssl.org>
    Reviewed-by: Eugene Syromiatnikov <esyr@openssl.org>
    MergeDate: Tue Mar 31 00:22:27 2026
    (Merged from https://github.com/openssl/openssl/pull/30616)

diff --git a/include/internal/sockets.h b/include/internal/sockets.h
index c5f2978713..ba8432c0a5 100644
--- a/include/internal/sockets.h
+++ b/include/internal/sockets.h
@@ -73,6 +73,15 @@ struct servent *PASCAL getservbyname(const char *, const char *);
 #define SHUT_RDWR SD_BOTH
 #endif

+/*
+ * Recent MINGW versions use Windows-style unsigned INVALID_SOCKET.
+ * Since OpenSSL uses int, this only silences an already-ignored warning.
+ */
+#if defined(__MINGW32__) && defined(INVALID_SOCKET)
+#undef INVALID_SOCKET
+#define INVALID_SOCKET (INT_PTR)(~0)
+#endif
+
 #else
 #if defined(__APPLE__)
 /*