From patchwork Tue Jan 26 14:16:32 2010
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Subject: configure: verify stdio.h
From: "Michael S. Tsirkin" <mst@redhat.com>
X-Patchwork-Id: 43701
Message-Id: <20100126141632.GA20173@redhat.com>
To: weil@mail.berlios.de, hpoussin@reactos.org, lcapitulino@redhat.com,
 Anthony Liguori <anthony@codemonkey.ws>, qemu-devel@nongnu.org,
 berrange@redhat.com
Cc: 
Date: Tue, 26 Jan 2010 16:16:32 +0200

Verify that stdio.h supports %ll and %z
Some migw variants don't unless requested explicitly (see
http://www.mail-archive.com/mingw-w64-public@lists.sourceforge.net/msg00417.html)
), detect them early.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 configure |   25 +++++++++++++++++++++++++
 1 files changed, 25 insertions(+), 0 deletions(-)

diff --git a/configure b/configure
index 5631bbb..7bbe4bc 100755
--- a/configure
+++ b/configure
@@ -123,6 +123,31 @@ else
     exit 1
 fi
 
+# Check that stdio.h compiler is sane: some
+# mingw variants do not support %z %l that we rely on
+cat > $TMPC <<EOF
+#include <stddef.h>
+#include <stdio.h>
+size_t z = 1;
+long long ll = 2;
+int main(void) {
+  printf("z=%zd;ll=%lld;\n", z, ll);
+  return 0;
+}
+EOF
+
+if compile_prog && ($TMPE | grep "z=1;ll=2;" > /dev/null); then
+  : C compiler works ok
+else
+    echo "ERROR: \"$cc\" does not have a working stdio.h"
+    exit 1
+fi
+
+cat > $TMPC << EOF
+#include <unistd.h>
+int main(void) { return fdatasync(0); }
+EOF
+
 check_define() {
 cat > $TMPC <<EOF
 #if !defined($1)