Commits on Jul 15, 2022

1. git: workaround new requirement to use common-main …

   Due to upstream changes, the Git fuzzers must now link against
   common-main.o; however, this breaks the build in two ways:
   
   1) Linking with common-main.o causes main() to have multiple
   definitions, one in common-main.o and one from the fuzzing engine.
   
   2) To avoid google#1, the Git Makefile specifically excludes common-main.o
   from the fuzzer build rule.
   
   To work around these issues, we can override FUZZ_CXXFLAGS (add
   "-Wl,--allow-multiple-definition" to fix google#1) and LIB_FUZZING_ENGINE (add
   "common-main.o" to fix google#2).
   
   Once we can get a Makefile fix into Git's upstream, we can remove the
   override for LIB_FUZZING_ENGINE.
   
   However, this change causes `check_build` to fail for honggfuzz, and we
   have not yet been able to diagnose the reason. So for now, we also need
   to limit our engines to afl and libfuzzer.

   

   steadmon committed Jul 15, 2022
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