Adding lib32stdc++6 to base-runner

[patateqbool]

lib32stdc++6 is missing for 32bits target. I tried to understand why target with i386 architecture enabled are passing test_all.py in base-runner, and it seems they do not depend of this library in the final build. I took as an example https://github.com/google/oss-fuzz/tree/master/projects/openh264, as we can see this target does not have libstdc++.so.6 as a dependency:

./decoder_fuzzer: /lib/i386-linux-gnu/libm.so.6: version `GLIBC_2.29' not found (required by ./decoder_fuzzer)
        linux-gate.so.1 (0xf7eee000)
        libm.so.6 => /lib/i386-linux-gnu/libm.so.6 (0xf7dd2000)
        libpthread.so.0 => /lib/i386-linux-gnu/libpthread.so.0 (0xf7db2000)
        librt.so.1 => /lib/i386-linux-gnu/librt.so.1 (0xf7da8000)
        libdl.so.2 => /lib/i386-linux-gnu/libdl.so.2 (0xf7da3000)
        libgcc_s.so.1 => /lib/i386-linux-gnu/libgcc_s.so.1 (0xf7d85000)
        libc.so.6 => /lib/i386-linux-gnu/libc.so.6 (0xf7ba9000)
        /lib/ld-linux.so.2 (0xf7eef000)

However with a target that needs it, we get:

root@08fe95743993:/workspace/out/libfuzzer-address-i386# ldd fuzz
        linux-gate.so.1 (0xf7f36000)
        libstdc++.so.6 => not found
        libm.so.6 => /lib32/libm.so.6 (0xf7e29000)
        libpthread.so.0 => /lib32/libpthread.so.0 (0xf7e06000)
        librt.so.1 => /lib32/librt.so.1 (0xf7dfa000)
        libdl.so.2 => /lib32/libdl.so.2 (0xf7df4000)
        libgcc_s.so.1 => /lib32/libgcc_s.so.1 (0xf7dd5000)
        libc.so.6 => /lib32/libc.so.6 (0xf7be9000)
        /lib/ld-linux.so.2 (0xf7f37000)
root@08fe95743993:/workspace/out/libfuzzer-address-i386# ./fuzz
./fuzz: error while loading shared libraries: libstdc++.so.6: cannot open shared object file: No such file or directory

The build itself works perfectly fine though, as the package libstdc++-9-dev:i386 is install in the Dockerfile

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[jonathanmetzman]

base-runner is not actually the image we use for running fuzzers on ClusterFuzz so this change by itself will only hide the problem (causing tests to pass) and not fix it. Why do you need this though? I think almost every project we have gets linked with libc++ why is yours being linked against libstdc++?

[jonathanmetzman]

Ping

[patateqbool]

Hi @jonathanmetzman, sorry for the very long delay. You’re right, I should probably link against libc++, I’m gonna close this pull request and re open it if I can’t link my target with libc++. Thank you for your answer.