Some error about Instrumentment

[Xiaobo Xiang]

Hello , 

I've met a  problem when using libfuzzer , I'm not sure whether it is my problem . 

I followed the instructions in the website :

===

$ git clone https://chromium.googlesource.com/chromium/llvm-project/llvm/lib/Fuzzer

$ export CXX=clang++-3.8

$ ./build.sh

ar : `u' modifier gnored since `D' is the defualt (see `U')

ar : creating libFuzzer.a

$ clang++-3.8 fsanitize-coverage=bb -fsanitize=address test/MemcmpTest.cpp libFuzzer.a -std=gnu++11

$ ./a.out

INFO: Seed 194626137

INFO: Loaded 0 modules ( 0 guards) : 

INFO: -max-len is not provided , using 64

INFO: A corpus is not providec, starting from an empty corpus

#0    : READ units: 1 

#1    : INITED exec/s: 0  rss: 15Mb

ERROR:  no interesting inputs were found. Is the code instrumented for coverage? Exiting.

===

I also tried $ ASAN_OPTIONS=coverage=1 ./a.out , and tried to add test cases as init corpus , and even tried to give it a crash testcase directly , the crash could occur , but still show :

ERROR:  no interesting inputs were found. Is the code instrumented for coverage? Exiting.

Could you please help me point out the reason to this issue , 

Thanks a lot !

Best wishes . 

Xiang Xiaobo

[Konstantin Serebryany]

Hi Xiaobo, 

Please make sure to use the fresh clang: http://libfuzzer.info#versions

Clang 3.8 is not going to work. 

--kcc 

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