[PATCH 2/4 v2] mingw: avoid problems for using %zd (C99)

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Otherwise the following problem can be faced:
src/vscclient.c: In function 'connect_to_qemu':
src/vscclient.c:642:16: error: unknown conversion type character 'z' in format [-Werror=format=]
         printf("Connected (sizeof Header=%zd)!\n", sizeof(VSCMsgHeader));
                         ^
src/vscclient.c:642:16: error: too many arguments for format [-Werror=format-extra-args]
---
Changes since v1:
- Fix the host_os check
- Fix the (linux) compilation break
---
 Makefile.am  |  4 ++++
 configure.ac | 13 +++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/Makefile.am b/Makefile.am
index f106bd9..f39f5d8 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -48,6 +48,10 @@ vscclient_SOURCES = src/vscclient.c
 vscclient_LDADD = libcacard.la $(CACARD_LIBS) $(GTHREAD_LIBS)
 vscclient_CFLAGS = $(AM_CPPFLAGS) $(GTHREAD_CFLAGS)
 
+if OS_WIN32
+vscclient_CFLAGS += -D__USE_MINGW_ANSI_STDIO=1
+endif
+
 AM_CPPFLAGS = $(CACARD_CFLAGS) $(WARN_CFLAGS)
 EXTRA_DIST =					\
 	NEWS					\
diff --git a/configure.ac b/configure.ac
index e2214b3..b841ec1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -10,6 +10,19 @@ AM_INIT_AUTOMAKE([foreign subdir-objects no-dist-gzip dist-xz])
 AM_MAINTAINER_MODE([enable])
 m4_ifdef([AM_SILENT_RULES],[AM_SILENT_RULES([yes])])
 
+AC_CANONICAL_HOST
+AC_MSG_CHECKING([for native Win32])
+case "$host_os" in
+     *mingw*|*cygwin*)
+        os_win32=yes
+        ;;
+     *)
+        os_win32=no
+        ;;
+esac
+AC_MSG_RESULT([$os_win32])
+AM_CONDITIONAL([OS_WIN32],[test "$os_win32" = "yes"])
+
 AX_CHECK_ENABLE_DEBUG([yes],[DEBUG])
 
 AC_PROG_CC
-- 
2.4.3

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