Re: jdk build fails due to "warning: ‘readdir_r’ is deprecated"

Florian Weimer fweimer at
Mon Apr 30 10:37:32 UTC 2018

On 04/05/2018 03:14 PM, David Holmes wrote:
> Sure, but "generally unnecessary in multithreaded programs" doesn't 
> quite cut it when it comes to correctness. So we have a couple of 
> obscure cases where readdir_r may do the wrong thing and we have a 
> subset of cases where readdir may be thread-safe "enough"; and hopefully 
> one day POSIX will specify it as thread-safe and all will be well in world.
> Until such time as that happens IMHO we stick with the code we that 
> seems to be working perfectly fine and disable the warning.

readdir_r does not work reliably on SMB mounts on GNU/Linux.  If you use 
it, you have a real bug.

readdir_r was introduced to deal with systems which implement opendir as 
a cast of the file descriptor to a DIR *, without allocating anything. 
Such systems do not exist anymore, and they certainly do not run OpenJDK.


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