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[PULL,10/11] Make avx2 configure test work with -O2

Message ID 1465234520-11160-11-git-send-email-pbonzini@redhat.com
State New
Headers show

Commit Message

Paolo Bonzini June 6, 2016, 5:35 p.m. UTC 
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>

When configured with --extra-cflags=-O2 gcc optimised out the test
and the readelf failed the check leaving avx2 disabled.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <1464792879-30954-2-git-send-email-dgilbert@redhat.com>
Reviewed-by: Liang Li <liang.z.li@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 configure | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/configure b/configure
index 6d01d96..08952af 100755
--- a/configure
+++ b/configure
@@ -1783,7 +1783,7 @@  fi
 cat > $TMPC << EOF
 static void bar(void) {}
 static void *bar_ifunc(void) {return (void*) bar;}
-static void foo(void) __attribute__((ifunc("bar_ifunc")));
+void foo(void) __attribute__((ifunc("bar_ifunc")));
 int main(void) { foo(); return 0; }
 EOF
 if compile_prog "-mavx2" "" ; then