I am trying to use the libjansson library from a cmake project using the Debian
installed package. However I found that the libjansson-dev package provides the
jansson.pc file that can be used with pkg-config but not the
janssonConfig.cmake file to be used by cmake projects.

It seems that the library has a dual build system: autotools and cmake
(https://jansson.readthedocs.io/en/latest/gettingstarted.html#compiling-and-
installing-jansson). I have tried to build it with cmake and in that case it
creates the cmake configuration files needed for cmake-based projects. However
the autotools-based build creates only the pkg-config configuration file.
Interestingly, the cmake-based build _also_ creates the pkg-config
configuration file, so I think that an easy way to solve the issue is to use
cmake to build the Debian package, which hopefully won't introduce any
regression since the already provided pgk-config file would still be installed.

Yes, please. Currently having the same issue. CMake configuration file
is needed for CoMaps build.

Also I couldn't notice that package seems to abandoned.

David

Hello all,

JFTR, it seems while building with cmake is indeed possible, there are
some upstream glitches that still need resolving, cf.

Exported symbols aren't consistent #715
https://github.com/akheron/jansson/issues/715
(various fixes suggested)

whereas some other things apparently were fixed already, but only in
newer versions than currently present in Debian, cf.

JSON_INTEGER_IS_LONG_LONG is part of API but it differs between cmake &
autotools (2.14) #696
https://github.com/akheron/jansson/issues/696
(resolved with 2.14.1)

Refactor tests to work better with CMake
https://github.com/akheron/jansson/commit/88375fb10ee775d0c07edd8394d09de34b7ebec3
(resolved with 2.14.1)

Use target-based cmake settings
https://github.com/akheron/jansson/commit/0f9c18dd1264704b55f41644aecbabf2567a9723
(resolved with 2.15.0)

Set minimum cmake version to 3.10
https://github.com/akheron/jansson/commit/aef13f87f18efec7c2a543045301602af6177a83
(resolved with 2.15.0)

cmake build with FetchContent
https://github.com/akheron/jansson/issues/724
(resolved with 2.15.0)

so switching to building with cmake first requires the new upstream
versions and then some more care.

JFTR, there exists https://bugs.debian.org/1130860 for handling that.

HTH,
Flo