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[Qemu-devel] [PATCH 1/7] vhost build fix for i386
From: |
Stefan Hajnoczi |
Subject: |
[Qemu-devel] [PATCH 1/7] vhost build fix for i386 |
Date: |
Wed, 27 Jul 2011 10:17:26 +0100 |
From: Wolfgang Mauerer <address@hidden>
vhost.c uses __sync_fetch_and_and(), which is only
available for -march=i486 and above (see
https://bugzilla.redhat.com/show_bug.cgi?id=624279).
Signed-off-by: Wolfgang Mauerer <address@hidden>
Signed-off-by: Stefan Hajnoczi <address@hidden>
---
configure | 23 +++++++++++++++++++++++
1 files changed, 23 insertions(+), 0 deletions(-)
diff --git a/configure b/configure
index 38e3724..9bfe917 100755
--- a/configure
+++ b/configure
@@ -2510,6 +2510,29 @@ if test "$trace_backend" = "dtrace"; then
fi
##########################################
+# __sync_fetch_and_and requires at least -march=i486. Many toolchains
+# use i686 as default anyway, but for those that don't, an explicit
+# specification is necessary
+if test $vhost_net = "yes" && test $cpu = "i386"; then
+ cat > $TMPC << EOF
+int sfaa(unsigned *ptr)
+{
+ return __sync_fetch_and_and(ptr, 0);
+}
+
+int main(int argc, char **argv)
+{
+ int val = 42;
+ sfaa(&val);
+ return val;
+}
+EOF
+ if ! compile_prog "" "" ; then
+ CFLAGS+="-march=i486"
+ fi
+fi
+
+##########################################
# End of CC checks
# After here, no more $cc or $ld runs
--
1.7.5.4
- [Qemu-devel] [PULL 0/7] Trivial patches for June 25 to July 27 2011, Stefan Hajnoczi, 2011/07/27
- [Qemu-devel] [PATCH 2/7] Makefile: Minor cscope fixups, Stefan Hajnoczi, 2011/07/27
- [Qemu-devel] [PATCH 4/7] Makefile: fix out-of-tree builds, Stefan Hajnoczi, 2011/07/27
- [Qemu-devel] [PATCH 3/7] slirp: Fix unusual "comments" in unused code, Stefan Hajnoczi, 2011/07/27
- [Qemu-devel] [PATCH 6/7] Makefile: add missing deps on $(GENERATED_HEADERS), Stefan Hajnoczi, 2011/07/27
- [Qemu-devel] [PATCH 5/7] qmp: fix efect -> effect typo in qmp-commands.hx, Stefan Hajnoczi, 2011/07/27
- [Qemu-devel] [PATCH 7/7] xen_mapcache: remove unused variable, Stefan Hajnoczi, 2011/07/27
- [Qemu-devel] [PATCH 1/7] vhost build fix for i386,
Stefan Hajnoczi <=