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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>
This commit is contained in:
Martin Storsjö 2013-05-15 23:51:49 +03:00
parent e45d6222cc
commit 0b6899f154
1 changed files with 7 additions and 0 deletions
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7
configure vendored
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@ -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