From 0b6899f154347cdd0aa66c5ec16ed9c65871766f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Storsj=C3=B6?= <martin@martin.st>
Date: Wed, 15 May 2013 23:51:49 +0300
Subject: [PATCH] configure: msvc: Set the target windows version to XP if no
target is set
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MSVC 2010 (or more precisely, Windows SDK 7.0 which comes with MSVC
2010) sets _WIN32_WINNT to the constant for Windows 7 if nothing is
set. This could lead to the libav configure script detecting and
using functions only present in Windows 7 or newer, which in most
cases isn't desired. If the caller explicitly wants this, the caller
can add the _WIN32_WINNT define via --extra-cflags, setting the desired
version.
Signed-off-by: Martin Storsjö <martin@martin.st>
---
configure | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/configure b/configure
index f39a860dc37..bf511edf35d 100755
--- a/configure
+++ b/configure
@@ -3201,6 +3201,13 @@ elif check_func_headers stdlib.h _get_doserrno; then
add_compat msvcrt/snprintf.o snprintf=avpriv_snprintf \
_snprintf=avpriv_snprintf \
vsnprintf=avpriv_vsnprintf
+ # The MSVC 2010 headers (Win 7.0 SDK) set _WIN32_WINNT to
+ # 0x601 by default unless something else is set by the user.
+ # This can easily lead to us detecting functions only present
+ # in such new versions and producing binaries requiring windows 7.0.
+ # Therefore explicitly set the default to XP unless the user has
+ # set something else on the command line.
+ check_cpp_condition stdlib.h "defined(_WIN32_WINNT)" || add_cppflags -D_WIN32_WINNT=0x0502
elif check_cpp_condition stddef.h "defined __KLIBC__"; then
libc_type=klibc
fi
--
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