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Fix macOS fuzz: explicitly link LLVM libc++ to avoid weak-def symbol error

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The fuzz targets were crashing on macOS 14 with:
  dyld: weak-def symbol not found '__ZnwmSt19__type_descriptor_t'

libFuzzer compiled with LLVM 18 uses typed allocation ABI symbols
not present in macOS 14's system libc++. Since DYLD_LIBRARY_PATH
cannot override SIP-protected /usr/lib/libc++.1.dylib at runtime,
we fix this at link time:
- -nostdlib++: suppress implicit system libc++ linking
- -L$LLVM/lib/c++ -lc++: explicitly link LLVM's libc++ (which has the symbol)
- -Wl,-rpath,$LLVM/lib/c++: embed rpath so dyld finds LLVM's libc++ at runtime

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Alex Garcia 2026-03-03 10:06:36 -08:00
parent 1b53b942e0
commit b93a669224
1 changed files with 1 additions and 1 deletions
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2
.github/workflows/fuzz.yaml vendored
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@ -73,7 +73,7 @@ jobs:
LLVM=/opt/homebrew/opt/llvm@18 LLVM=/opt/homebrew/opt/llvm@18
make -C tests/fuzz all \ make -C tests/fuzz all \
FUZZ_CC=$LLVM/bin/clang \ FUZZ_CC=$LLVM/bin/clang \
FUZZ_LDFLAGS="-Wl,-ld_classic" FUZZ_LDFLAGS="-Wl,-ld_classic -nostdlib++ -L$LLVM/lib/c++ -lc++ -Wl,-rpath,$LLVM/lib/c++"
- name: Run fuzz targets - name: Run fuzz targets
env: env:
DYLD_LIBRARY_PATH: "/opt/homebrew/opt/llvm@18/lib/c++:${{ env.DYLD_LIBRARY_PATH }}" DYLD_LIBRARY_PATH: "/opt/homebrew/opt/llvm@18/lib/c++:${{ env.DYLD_LIBRARY_PATH }}"