Re: acs_map symbol

[Sven Joachim]

On 2015-04-29 03:15 +0200, Thomas Dickey wrote:

> On Wed, Apr 29, 2015 at 12:39:02AM +0000, address@hidden wrote:
>> Hi,
>> 
>> Linux "make menuconfig" fails due to a linking issue.
>> 
>> (I have a  _split_ shared ncursesw library, version 5.9.20150425)
>> 
>> Linux uses pkg-config for its menuconfig linking flags. And I get a missing
>> libtinfow due to the symbol acs_map.
>> 
>> After little investigation:
>>   - the acs_map symbol is defined in ncurses.h.
>>   - the linker expect to find the libtinfow library in its argument list 
>> because of acs_map symbol.
>>   - pkg-config does not output the libtinfow linker flags because it's in 
>> the "private" section of ncursesw.pc.
>> 
>> It seems that in ncursesw.pc, libtinfow dependency should be delared
>> in the Require field and not he Require.private field.
>> That, to output libtinfow linker flags for any application linking to the 
>> ncursesw package.
>> 
>> Do I miss anything?
>
> hmm - maybe, maybe not.  The feature was from this change:
>
> 20111008
>       + modify misc/gen-pkgconfig.in to use Requires.private for the parts
>         of ncurses rather than Requires, as well as Libs.private for the
>         other library dependencies (prompted by Debian #644728).

It seems to me that this change was incorrect.

> I'd likely overlooked this because (to avoid interfering with Debian's
> packages) have generally put my test-libraries in /usr/local, and used
> rpath to help that.  However I might have stumbled over it "soon" since
> I'm in the process of reworking the test-package to put it in /usr (and
> not need rpath...).
>
> I'm puzzled why you've run into this problem at this point in time (unless
> it's some issue with the way my reworking is progressing...)

Most (all?) distributions who split tinfo libraries use a linker script
for ncursesw.so to avoid breaking software which does not use pkg-config
for determining how to link with ncursesw.

Cheers,
       Sven