Is it possible to suppress Xcode 4 static analyzer warnings?

Question

The Xcode 4 static analyzer reports in my code some false positives. Is there any way to suppress them?

Answer 1

most of the time, using things like CF_RETURNS_RETAINED and following the 'create' rule works for me, but I ran into a case I could NOT suppress. Finally found a way to suppress the analyzer by looking at llvm source code:

https://llvm.org/svn/llvm-project/cfe/trunk/test/ARCMT/objcmt-arc-cf-annotations.m.result

"Test to see if we suppress an error when we store the pointer to a global."

static CGLayerRef sSuppressStaticAnalyzer;
static CGLayerRef sDmxImg[2][2][1000]; // a cache of quartz drawings.
CGLayerRef CachedDmxImg(...) // which lives for lifetime of app!
{
    ...

    CGLayerRef img = sDmxImg[isDefault][leadingZeroes][dmxVal];
    if ( !img )
    {
        NSRect imgRect = ;

        [NSGraphicsContext saveGraphicsState];
        CGContextRef ctx = (CGContextRef)[[NSGraphicsContext currentContext] graphicsPort];
        CGLayerRef cgLayerRef = CGLayerCreateWithContext(ctx, imgRect.size, NULL);
        CGContextRef layerCtx = CGLayerGetContext(cgLayerRef);
        [NSGraphicsContext setCurrentContext: [NSGraphicsContext graphicsContextWithGraphicsPort:layerCtx flipped:YES]];

        ... draw some gorgeous expensive Quartz stuff ...

        img = cgLayerRef;
        sDmxImg[isDefault][leadingZeroes][dmxVal] = cgLayerRef;
        sSuppressStaticAnalyzer = cgLayerRef; // suppress static analyzer warning!
        [NSGraphicsContext restoreGraphicsState];
   }
   return img;
}

For some reason, assigning to a static array didn't suppress the warning, but assigning to a plain old static 'sSuppressStaticAnalyzer' does. By the way the above method, using CGLayerRef is the fastest way I've found to redraw cached images (besides OpenGL).