https://bugs.openldap.org/show_bug.cgi?id=9447
Issue ID: 9447
Summary: Defining MDB_DEBUG has no effect
Product: LMDB
Version: unspecified
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: ---
Component: liblmdb
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
I tried to compile mdb.c with -DMDB_DEBUG=2 to get some debug output, but
nothing was written.
Looking at mdb.c it looks as if the code block that sets the mdb_debug static
flag should be moved to above the line that does txn->mt_txnid++; (since
mt_txnid is unsigned and mdb_debug_start starts out as zero and is never
changed, so txn->mt_txnid+1 would never be zero unless it wraps around or is
initialized to (size_t)-1 somewhere).
Moving the code block does indeed cause a lot of debug messages to be written.
This is lmdb 5b75edb6337b28669c1370bc33442e272e72f91a but looking at the git
history it looks as if the code has been the same since mdb_debug was
introduced so perhaps the code never worked.
The code at
https://git.openldap.org/openldap/openldap/-/blob/master/libraries/liblmdb/mdb.c#L2760
looks like:
txn->mt_txnid++;
#if MDB_DEBUG
if (txn->mt_txnid == mdb_debug_start)
mdb_debug = 1;
#endif
(I am new to the code and to lmdb so apologies if I missed something obvious.)
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