[gnutls-devel] GnuTLS | clang ASAN fails on testcompat-tls13-openssl.sh (#920)

[Development of GNU's TLS library]

Tim Rühsen created an issue: https://gitlab.com/gnutls/gnutls/issues/920



`testcompat-tls13-openssl.sh` fails even with the most basic clang/llvm address sanitize options. Tested with clang-8, clang-9 and clang-10. The sanitizer itself doesn't trigger (or at least there is no output). So there must be some subtleties going on - not sure why OSS-Fuzz with it's many projects doesn't stumble upon it somewhere.

```
CFLAGS="-fsanitize=address" CC=clang ./configure --disable-guile --disable-doc --disable-hardware-acceleration
make clean
make -j$(nproc)
make check -j$(nproc) -C tests TESTS="setcredcrash"
make check -j$(nproc) -C tests/suite TESTS=testcompat-tls13-openssl.sh
```

The setcredcrash line just builds everything in `tests/`, else `testcompat-tls13-openssl.sh` will SKIP. Like a dependency issue in `tests/suite/Makefile.am`.

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