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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

From	Adrian Bunk <bunk@debian.org>
Newsgroups	linux.debian.bugs.dist
Subject	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
Date	2025-11-11 14:40 +0100
Message-ID	<LPWLf-carR-7@gated-at.bofh.it> (permalink)
References	<LuBs8-f2Q8-59@gated-at.bofh.it> <LPFr3-bYQr-11@gated-at.bofh.it> <LPR8S-c6M1-5@gated-at.bofh.it> <LuBs8-f2Q8-59@gated-at.bofh.it> <LPR8S-c6M1-5@gated-at.bofh.it>
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On Tue, Nov 11, 2025 at 08:30:55AM +0100, Timo Röhling wrote:
> Hi Adrian,

Hi Timo,

> * Adrian Bunk <bunk@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.

thanks!

> Cheers
> Timo

cu
Adrian

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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 Santiago Vila <sanvila@debian.org> - 2025-09-13 18:40 +0200
  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 Adrian Bunk <bunk@debian.org> - 2025-11-10 20:10 +0100
  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 Adrian Bunk <bunk@debian.org> - 2025-11-11 14:40 +0100

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