On Sun, 2007-09-09 at 09:44 -0700, Les wrote: > On Fri, 2007-09-07 at 21:21 +0000, Mike -- EMAIL IGNORED wrote: > > I have a simple test program using threads, etc. that > > compiles, links, and runs correctly, BUT if I try to > > link with -static, it get various undefined variables > > related to condition variables and mutexes. > > > > Why is this? Is there something I can do about it? > > > > BTW, I do have /usr/lib/librt.a > > > > Thanks for your help. > > > > Mike. > > > Hi, Mike, > I didn't see an answer to your question, so I'll give it a try... > Static means that the libraries as well as the code is statically > linked. This would cause the libraries to remain in memory and you > could step through them. But lots of libraries and drivers are not > re-entrant, a requirement for threading. Thus when you statically link, > step into one of those bits of code, your system would stop. > I suspect your question about the other variables are something to do > with statically linking these non-re-entrant libraries, but I cannot > confirm that. I haven't used static linking for a long time. Generally > it is only useful when debugging some errant link between your code and > a relevant library, but some debuggers won't work without static links. > If yours is the latter case, it may be time to look to another debugger. > If the former case, you may have to do some discussion with the relevant > library source code outside the debugger to see if perhaps the > non-re-entrant bits are the original problem, and in that case, a > bugzilla of the relevant library might be in order. But you should > realize that some libraries are never going to be re-entrant, either due > to the resources they address, or due to the nature of the processing > they handle. > > Of course I could be wrong > Regards, > Les > Why would a statically linked library be any less re-entrant then a dynamically linked library? There is another reason for statically linking a module. It will run faster. -- ======================================================================= I had a lease on an OEDIPUS COMPLEX back in '81 ... ======================================================================= Aaron Konstam telephone: (210) 656-0355 e-mail: akonstam@xxxxxxxxxxxxx
