[FFmpeg-devel] [PATCH] configure: Improve the check for schannel DTLS constants (PR #20444)

[FFmpeg-devel] [PATCH] configure: Improve the check for schannel DTLS constants (PR #20444)

[Martin Storsjö via ffmpeg-devel]

PR #20444 opened by Martin Storsjö (mstorsjo)
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20444
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20444.patch

This amends 307983b292adb60c82e75c8e5e41deedc89efbf0 to fix
building with older versions of mingw-w64.

The previously checked constant, SP_PROT_DTLS1_X_CLIENT, was
added in mingw-w64 in df36f5deda23192d0ee99ffd661ea36df924e667
in 2020, and is included in released versions since v8.0.0.

The new checked constant SECPKG_ATTR_DTLS_MTU was added in
mingw-w64 in 0792283787cca8fc27dd38671107c791c87f4db3 in 2021,
and first appeared in mingw-w64 v9.0.0.

This fixes building with mingw-w64 v8, which is the version bundled
in Ubuntu 22.04.


From 5e1de8a18a1f87e0e649c39c98fe68fd0b355e9d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Storsj=C3=B6?= <martin@martin.st>
Date: Fri, 5 Sep 2025 11:55:31 +0300
Subject: [PATCH] configure: Improve the check for schannel DTLS constants

This amends 307983b292adb60c82e75c8e5e41deedc89efbf0 to fix
building with older versions of mingw-w64.

The previously checked constant, SP_PROT_DTLS1_X_CLIENT, was
added in mingw-w64 in df36f5deda23192d0ee99ffd661ea36df924e667
in 2020, and is included in released versions since v8.0.0.

The new checked constant SECPKG_ATTR_DTLS_MTU was added in
mingw-w64 in 0792283787cca8fc27dd38671107c791c87f4db3 in 2021,
and first appeared in mingw-w64 v9.0.0.

This fixes building with mingw-w64 v8, which is the version bundled
in Ubuntu 22.04.
---
 configure | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure b/configure
index 7ec4c3975b..0aa93622fe 100755
--- a/configure
+++ b/configure
@@ -7349,7 +7349,7 @@ enabled schannel &&
     schannel_extralibs="-lsecur32 -lncrypt -lcrypt32" ||
         disable schannel
 
-enabled schannel && check_cc dtls_protocol "windows.h security.h schnlsp.h" "int i = SP_PROT_DTLS1_X_CLIENT;" -DSECURITY_WIN32
+enabled schannel && check_cc dtls_protocol "windows.h security.h schnlsp.h" "int i = SECPKG_ATTR_DTLS_MTU;" -DSECURITY_WIN32
 
 makeinfo --version > /dev/null 2>&1 && enable makeinfo  || disable makeinfo
 enabled makeinfo \
-- 
2.49.1

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