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Merge #19452: doc: afl fuzzing comment about afl-gcc and afl-g++

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2b78a11b48 doc: afl fuzzing comment about afl-gcc and afl-g++ (nsa)

Pull request description:

  When trying to build the fuzz tests with `--enable-lcov` on a Ubuntu machine, noticed that the documentation was lacking with regards to the afl-gcc and afl-g++ options. `afl-clang-fast` and `afl-clang-fast++` in the examples just need to be replaced with `afl-gcc` and `afl-g++`. I also had to set the `-m` flag as well to get the fuzzers to run.

ACKs for top commit:
  practicalswift:
    ACK 2b78a11b48
  MarcoFalke:
    Concept ACK 2b78a11b48, haven't tested

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fanquake 2020-07-09 21:24:14 +08:00
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doc/fuzzing.md
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@ -121,6 +121,8 @@ $ git clone https://github.com/google/afl
$ make -C afl/
$ make -C afl/llvm_mode/
$ ./autogen.sh
# It is possible to compile with afl-gcc and afl-g++ instead of afl-clang. However, running afl-fuzz
# may require more memory via the -m flag.
$ CC=$(pwd)/afl/afl-clang-fast CXX=$(pwd)/afl/afl-clang-fast++ ./configure --enable-fuzz
$ make
# For macOS you may need to ignore x86 compilation checks when running "make". If so,