[Libguestfs] [PATCH libnbd] tests: Use libc_malloc_debug.so.0 instead of MALLOC_CHECK_ for glibc 2.34

Richard W.M. Jones rjones at redhat.com
Tue Aug 24 16:13:24 UTC 2021

This is the nbdkit change transplanted to libnbd.  Because there are
several subdirectory Makefiles which define the MALLOC_CHECK_
environment variables, I turned it into a macro which is placed in the
top level subdir-rules.mk.

Note this currently breaks valgrinding because of:
and because there's not a good place to unset GLIBC_TUNABLES in libnbd.


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