[Pkg-xmpp-devel] Bug#1115142: spectrum2: FTBFS: /usr/bin/ld: /usr/lib/x86_64-linux-gnu/libjsoncpp.a(json_reader.cpp.o): relocation R_X86_64_PC32 against symbol `_ZTVN4Json17CharReaderBuilderE' can not be used when making a shared object; recompile with -fPIC

[Timo Röhling]

Hi Adrian,

* Adrian Bunk <bunk at debian.org> [2025-11-10 21:03]:
>On Sat, Sep 13, 2025 at 04:29:34PM +0000, Santiago Vila wrote:
>> /usr/bin/ld: 
>> /usr/lib/x86_64-linux-gnu/libjsoncpp.a(json_reader.cpp.o): relocation 
>> R_X86_64_PC32 against symbol `_ZTVN4Json17CharReaderBuilderE' can not 
>> be used when making a shared object; recompile with -fPIC
>
>Editing libtransport/CMakeLists.txt to us JsonCpp::JsonCppShared 
>instead 
>of JsonCpp::JsonCpp fixes the build, but that shouldn't be necessary.
>
>Timo, can you see what's going wrong here related to
>https://sources.debian.org/src/spectrum2/2.2.1%2Bdfsg-2/cmake_modules/FindJsonCpp.cmake
>?

libjsoncpp provides its own JsonCpp::JsonCpp target, and that one 
prefers the static library over the shared one if both are built:
https://sources.debian.org/src/libjsoncpp/1.9.6-4/jsoncpp-namespaced-targets.cmake

I think I'm going to change that in libjsoncpp, which will restore the 
previous behavior (when the static library was not built at all) and 
makes more sense in the Debian context anyway.


Cheers
Timo

-- 
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⣾⠁⢠⠒⠀⣿⡁   │ Timo Röhling                                       │
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