Hi Sean, Generally, one does not need to rebuild any code that is being linked into sanitized code.
However, there is one corner case in C++ container overflow checking, where this might not always hold. Specifically, if libc++ containers cross from instrumented (rebuilt with ASan) to non-instrumented code, Address Sanitizer might report container overflow false positives. (Imagine two libraries, both using the same std::vector, only one of them is instrumented. Push_back from the non-instrumented module will not mark the memory for the newly added element as valid. Accessing the element from the instrumented code, would trigger a false positive report.) > From: Sean McBride <s...@rogue-research.com <mailto:s...@rogue-research.com>> > Date: January 22, 2016 at 8:26:00 AM PST > To: xcode-users@lists.apple.com <mailto:xcode-users@lists.apple.com> > Subject: Address Sanitizer and out-of-project libraries > > Hi all, > > My understanding of ASan (from before Xcode finally included it) was that if > you wanted to build with ASan, *all* the code you link to has to be built > with it. Is that still the case? > > My Xcode project contains most of my code, but also contains some .a and > .dylib files build with cmake or autotools. Must I rebuild those with ASan > too? > > It doesn't seem to be required, but I am seeing freaky crashes in libc++ with > ASan turned on via only Xcode's checkbox. What do these crashes look like? Are they C++ container overflow reports? Please, file a radar and provide us with more information about your project, the libraries you link against, and the crashes you are seeing. Attaching a project that would allow us to reproduce the issue would be the most helpful. Thanks you! Anna. > > Cheers, > > -- > ____________________________________________________________ > Sean McBride, B. Eng s...@rogue-research.com > <mailto:s...@rogue-research.com> > Rogue Research www.rogue-research.com > <http://www.rogue-research.com/> > Mac Software Developer Montréal, Québec, Canada >
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