oslib-posix: check for posix_memalign in configure script
Check for the presence of posix_memalign() in the configure script,
not using "defined(_POSIX_C_SOURCE) && !defined(__sun__)". This
lets qemu use posix_memalign() on NetBSD versions that have it,
instead of falling back to valloc() which is wasteful when the
required alignment is smaller than a page.
Signed-off-by: Andreas Gustafsson <gson@gson.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Reviewed-by: Kamil Rytarowski <n54@gmx.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
diff --git a/configure b/configure
index c1bbf17..fe9eea9 100755
--- a/configure
+++ b/configure
@@ -4659,6 +4659,21 @@
fi
##########################################
+# check if we have posix_memalign()
+
+posix_memalign=no
+cat > $TMPC << EOF
+#include <stdlib.h>
+int main(void) {
+ void *p;
+ return posix_memalign(&p, 8, 8);
+}
+EOF
+if compile_prog "" "" ; then
+ posix_memalign=yes
+fi
+
+##########################################
# check if we have posix_syslog
posix_syslog=no
@@ -5746,6 +5761,7 @@
echo "fdatasync $fdatasync"
echo "madvise $madvise"
echo "posix_madvise $posix_madvise"
+echo "posix_memalign $posix_memalign"
echo "libcap-ng support $cap_ng"
echo "vhost-net support $vhost_net"
echo "vhost-scsi support $vhost_scsi"
@@ -6232,6 +6248,9 @@
if test "$posix_madvise" = "yes" ; then
echo "CONFIG_POSIX_MADVISE=y" >> $config_host_mak
fi
+if test "$posix_memalign" = "yes" ; then
+ echo "CONFIG_POSIX_MEMALIGN=y" >> $config_host_mak
+fi
if test "$spice" = "yes" ; then
echo "CONFIG_SPICE=y" >> $config_host_mak
