Re: [bug-ncurses] C++ does not build with ncurses-5.9-20130316

[Dr. Werner Fink]

On Mon, Mar 25, 2013 at 07:30:54PM -0400, Thomas Dickey wrote:
> On Mon, Mar 25, 2013 at 06:24:35PM +0100, Dr. Werner Fink wrote:
> > On Mon, Mar 25, 2013 at 05:24:30PM +0100, Werner Fink wrote:
> > > On Mon, Mar 25, 2013 at 05:10:22PM +0100, Werner Fink wrote:
> > > > On Fri, Mar 22, 2013 at 06:02:20PM -0400, Thomas Dickey wrote:
> > > > > On Fri, Mar 22, 2013 at 01:03:10PM +0100, Dr. Werner Fink wrote:
> > > > > > Hi,
> > > > > > 
> > > > > > just found this
> > > > > 
> > > > > hmm - a pointer to the configure-options would help...
> > > 
> > > Just found that it happens after the second configure run.
> > > The first make run works flawless but the second one seems to see 
> > > leftovers of the previous configure/make run.
> > > 
> > 
> > Seems to be a difference between ABI 5 and ABI 6 with REENTRANT code:
> 
> yes -- the "--enable-reeentrant" option wraps the global variables as
> functions to keep them from being modified except via a function (which
> lets one add a mutex or whatever).
> 
> ABI 6 doesn't have to use that option, but the reentrant feature relies
> on ABI 6.  Normally the libraries are named differently (with a "t" on
> the end).  Naming them the same - that is a problem for this case.

Hmm ... I've only four library types here

  libncurses.so.5.9/libtinfo.so.5.9
  libncursesw.so.5.9/libtinfow.so.5.9
  libncurses.so.6.0/libtinfo.so.6.0
  libncursesw.so.6.0/libtinfow.so.6.0

and the libs for ABI 6 are be default reeentrant.  Otherwise much more
libraries would be required.  In my experience the four types are more
than enough for customers.  Therefore I'd like see not to use more than
required.  This is the reason to make ABI 6 by default reeentrant here
as the most programs which rely on thread safe and wide character support.

The other exists only because there are third party programs which do
not use this.  I cna not enforce the customers and/or third party vendors
to use libncursesw.so.6.0/libtinfow.so.6.0 or 
libncursestw.so.6.0/libtinfotw.so.6.0
only.


Werner

-- 
  "Having a smoking section in a restaurant is like having
          a peeing section in a swimming pool." -- Edward Burr