Public bug reported:
[Impact]
Users trying to build software that links w/ jammy's libjsoncpp library will
hit a build failure if that software uses cmake and another library that also
requires libjsoncpp because libjsoncpp's cmake config does not protect against
duplicate imports. This can be reproduced by building a a newer version of
cmake itself using system libjsoncpp (I was trying to build 3.27.4, but I also
checked that it impacts cmake master).
[Test Case]
This can be demonstrated by calling find_package twice in a row:
$ mkdir test && cd test
$ cat > CMakeLists.txt << EOF
project(test)
find_package(jsoncpp 1.9.5)
find_package(jsoncpp 1.9.5)
EOF
$ cmake .
-- The C compiler identification is GNU 11.4.0
-- The CXX compiler identification is GNU 11.4.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
CMake Error at
/usr/lib/x86_64-linux-gnu/cmake/jsoncpp/jsoncpp-namespaced-targets.cmake:5
(add_library):
add_library cannot create imported target "JsonCpp::JsonCpp" because
another target with the same name already exists.
Call Stack (most recent call first):
/usr/lib/x86_64-linux-gnu/cmake/jsoncpp/jsoncppConfig.cmake:41 (include)
CMakeLists.txt:3 (find_package)
CMake Warning (dev) in CMakeLists.txt:
No cmake_minimum_required command is present. A line of code such as
cmake_minimum_required(VERSION 3.22)
should be added at the top of the file. The version specified may be lower
if you wish to support older CMake versions for this project. For more
information run "cmake --help-policy CMP0000".
This warning is for project developers. Use -Wno-dev to suppress it.
-- Configuring incomplete, errors occurred!
See also "/home/ubuntu/test/CMakeFiles/CMakeOutput.log".
[ What Could Go Wrong ]
We could cause reverse dependencies to fail to build from source due to an
inadvertent error. We can mitigate this by doing a test rebuild of the reverse
dependencies.
** Affects: libjsoncpp (Ubuntu)
Importance: Undecided
Status: Fix Released
** Affects: libjsoncpp (Ubuntu Jammy)
Importance: Undecided
Assignee: dann frazier (dannf)
Status: In Progress
** Affects: libjsoncpp (Ubuntu Mantic)
Importance: Undecided
Status: Fix Released
** Affects: libjsoncpp (Ubuntu Noble)
Importance: Undecided
Status: Fix Released
** Also affects: libjsoncpp (Ubuntu Jammy)
Importance: Undecided
Status: New
** Changed in: libjsoncpp (Ubuntu Jammy)
Status: New => In Progress
** Changed in: libjsoncpp (Ubuntu Jammy)
Assignee: (unassigned) => dann frazier (dannf)
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https://bugs.launchpad.net/bugs/2063950
Title:
duplicate JsonCpp::JsonCpp leads to build failures
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