raw-posix: Fix build without posix_fallocate()

Check for the presence of posix_fallocate() in configure and only
compile in support for PREALLOC_MODE_FALLOC when it's there.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 18 insertions, 0 deletions

diff --git a/configure b/configure
index a2c0f2a02a..681abfc669 100755
--- a/configure
+++ b/configure
@@ -3308,6 +3308,21 @@ if compile_prog "" "" ; then
   fallocate_punch_hole=yes
 fi
 
+# check for posix_fallocate
+posix_fallocate=no
+cat > $TMPC << EOF
+#include <fcntl.h>
+
+int main(void)
+{
+    posix_fallocate(0, 0, 0);
+    return 0;
+}
+EOF
+if compile_prog "" "" ; then
+    posix_fallocate=yes
+fi
+
 # check for sync_file_range
 sync_file_range=no
 cat > $TMPC << EOF
@@ -4522,6 +4537,9 @@ fi
 if test "$fallocate_punch_hole" = "yes" ; then
   echo "CONFIG_FALLOCATE_PUNCH_HOLE=y" >> $config_host_mak
 fi
+if test "$posix_fallocate" = "yes" ; then
+  echo "CONFIG_POSIX_FALLOCATE=y" >> $config_host_mak
+fi
 if test "$sync_file_range" = "yes" ; then
   echo "CONFIG_SYNC_FILE_RANGE=y" >> $config_host_mak
 fi