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docs: add a libxml2 external example - #320
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Problem
The external examples have no libtool build and no fuzz harness, the setup AFLplusplus/fuzz-reachability#4 integrates rllvm into.
Fix
examples/external/libxml2: build libxml2v2.15.4and its ownfuzz/xmlharness through rllvm, extract the fuzzer, and group its unresolved indirect calls withresolution-candidates.xmlMalloc/xmlRealloc/xmlFreeglobal hooks, whose candidates include the fuzzer's own allocator, and why the build leaves-fsanitize=fuzzer-no-linkout.reproduce.shbuilds the pinned tag on a macOS host, asserts the groups and candidates, and prints the recorded counts.Verification
reproduce.shfrom a fresh clone on arm64 macOS: exit 0, 35 modules, 2147 functions, 3020 unresolved calls in 77 groups; shellcheck is clean.