Re: PKG-Config not enabled.

[Thomas Dickey]

On Sat, Oct 09, 2021 at 04:27:32AM -0400, Thomas Dickey wrote:
> On Sat, Oct 09, 2021 at 09:43:23AM +0200, Pascal wrote:
> > 
> > > Le 3 oct. 2021 à 22:25, Thomas Dickey <dickey@his.com> a écrit :
> > > 
> > > On Sun, Oct 03, 2021 at 07:09:32PM +0200, Pascal wrote:
> > >> Hello,
> > >> 
> > >> When configuring ncurses, I got:
> > >> ...
> > >> ** Configuration summary for NCURSES 6.2 20210925:
> > >> ...
> > >> pkg-config directory: no
> > >> 
> > >> The last line seems to indicate that pkg-config is not enabled.
> > > 
> > > not exactly: it indicates that the configure script was not able to
> > > find the library-directory for pkg-config.  ncurses' configure script
> > > looks for this information so that it knows where to install ".pc" files.
> > > 
> > > (One of the design defects of pkg-config is that it's missing options for
> > > querying the tool for _its_ default configuration, which is aggravated by
> > > packagers putting it into interesting places).
> > > 
> > > The configure script attempts to find that in CF_WITH_PKG_CONFIG_LIBDIR,
> > > but that may fail.
> > 
> > Thanks Thomas,
> > 
> > it's ok now.
> > FYI, on my configuration, ncurses pc files are created in 
> > $prefix/share/pkgconfig.
> > One might expected in $prefix/lib/pkgconfig.
> 
> hmm: "lib" is conventionally used for binaries, and "share" for text.

Looking at the git repo, I see it's been that way a while.
(the repo's description is inaccurate by the way).
 
> On this (Debian) system, the manual page for pkg-config uses both:
> 
>        PKG_CONFIG_LIBDIR
>               Replaces  the  default  pkg-config  search  directory,   usually
>               /usr/lib/pkgconfig:/usr/share/pkgconfig.
> 
> ...and
>        pkg-config retrieves information about packages from  special  metadata
>        files.  These  files  are named after the package, and has a .pc exten‐
>        sion.   On  most  systems,  pkg-config  looks  in   /usr/lib/pkgconfig,
>        /usr/share/pkgconfig,     /usr/local/lib/pkgconfig     and     /usr/lo‐
>        cal/share/pkgconfig for these files.  It will additionally look in  the
>        colon-separated  (on  Windows, semicolon-separated) list of directories
>        specified by the PKG_CONFIG_PATH environment variable.
> 
> and the configure script actually looks in both places, but checks
> "share" first, with a comment about 2014 (which would be from Debian 5
> or 6 -- we've moved on a little).
> 
> I don't see a way to ask pkg-config what its built-in search order happens
> to be.  Previous discussion in this area has mostly dealt with the
> interesting variations that packagers have done for cross-compilers,
> which haven't been limited to just changing the $prefix.

The output from this does include the necessary info:

       PKG_CONFIG_DEBUG_SPEW
              If set, causes pkg-config to print all kinds of debugging infor‐
              mation and report all errors.

so I added a to-do item for that.

-- 
Thomas E. Dickey <dickey@invisible-island.net>
https://invisible-island.net
ftp://ftp.invisible-island.net

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