How to properly set up mem leak detection?

[DDvO]

I did not find a configuration option (in the doc or configure script) on building with memory leak detection and using it. Would be good to add a hint on this at least to the Unix section of the build documentation.

Adding -fsanitize=leak to the CFLAGS was promising,
but when using pkcs11.so as crypto engine with the current OpenSSL master I get

Invalid engine "pkcs11"
C0470945E67F0000:error::DSO support routines:could not load the shared library:crypto/dso/dso_dlfcn.c:118:filename(/usr/local/lib64/engines-3/pkcs11.so): /lib/x86_64-linux-gnu/liblsan.so.0: cannot allocate memory in static TLS block
C0470945E67F0000:error::DSO support routines:could not load the shared library:crypto/dso/dso_lib.c:162:

[mtrojnar]

I don't think our code uses Thread-local storage (TLS) directly, but some libraries may use it.
Have you tried using a different compiler (e.g., clang instead of gcc or gcc instead of clang)?

There should not be anything special about memory leak detection in our code. Generic techniques should be applicable.