prevent from optimizing out by some compilers (from XFree86 CVS)
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@@ -175,7 +175,7 @@ static int host_byte_order( void )
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* Error handling.
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*/
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#ifndef XFree86Server
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static int mesaXErrorFlag = 0;
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static volatile int mesaXErrorFlag = 0;
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static int mesaHandleXError( XMesaDisplay *dpy, XErrorEvent *event )
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{
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