[vlc-devel] [PATCH] configure: Check the toolchain default _WIN32_WINNT in addition to a command line override

[Martin Storsjö]

Since 255e2ce27, we try not to override _WIN32_WINNT in case it already
is defined on the command line to a higher value. However, if it isn't
specified on the command line, but the toolchain headers default to
a newer version, we should also honor it and keep that version instead
of forcing a lower version here. (If the toolchain defaults to a newer
version, runtime libs of the toolchain may rely on such a new version
anyway, so forcing a lower target within VLC might be useless.)
---
 configure.ac | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/configure.ac b/configure.ac
index 9aba863449..16fd5f20d5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -254,6 +254,11 @@ case "${host_os}" in
     AC_PREPROC_IFELSE([AC_LANG_PROGRAM(
       [[#ifdef _WIN32_WINNT
        # error _WIN32_WINNT already defined
+       #else
+       # include <windows.h>
+       # if defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x0601
+       #  error _WIN32_WINNT toolchain default high enough
+       # endif
        #endif
       ]],[[;]])
     ],[
-- 
2.17.1