output debug information of LOGCALL_CTOR/LOGCALL_VOID/...

[James Aylett]

On 9 Jun 2018, at 07:37, 张少华 <xiangqianzsh at 163.com> wrote:

> Many functions in xapian can be traced when they are called using LOGCALL_CTOR/LOGCALL_VOID/... and I want to output the debug information.

In xapian-core/HACKING in the source code there's a section on this. As well as pass --enable-log to configure, you also need to:

 * set XAPIAN_DEBUG_LOG to be the path to a file that you would like debugging
   output to be appended to, or to the special value ``-`` to indicate that you
   would like debugging output to be sent to stderr.  Unless XAPIAN_DEBUG_LOG
   is set, no debug logging will be performed.  Occurrences of %p in
   XAPIAN_DEBUG_LOG will be replaced with the current process-id.

> Also, I notice -DXAPIAN_REALLY_NO_DEBUG_LOG is added in xapian-core-1.4.5/Makefile, so I deleted this options, but I can not compile successfully then.

That symbol is to stop debug calls being available when compiling things that use Xapian. It's used in common/debuglog.h, which says:

// In places where we include library code in non-library contexts, we can't
// have debug logging enabled, as the support functions aren't visible

which sounds like exactly what you've encountered.

J

-- 
 James Aylett
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