From 0b6899f154347cdd0aa66c5ec16ed9c65871766f Mon Sep 17 00:00:00 2001 From: Martin Storsjö Date: Wed, 15 May 2013 23:51:49 +0300 Subject: configure: msvc: Set the target windows version to XP if no target is set MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 --- configure | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'configure') diff --git a/configure b/configure index f39a860dc3..bf511edf35 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 -- cgit v1.2.3