Rick van Rein created PROTON-2254:
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Summary: Relative paths in CMake share
Key: PROTON-2254
URL: https://issues.apache.org/jira/browse/PROTON-2254
Project: Qpid Proton
Issue Type: Improvement
Components: proton-c
Affects Versions: proton-c-0.31.0
Environment: Debian Linux; build Proton then Dispatch into each their
own `DESTDIR`. This is done by our "layered build" system,
https://gitlab.com/arpa2/mkhere/-/blob/master/qpid_proton.sh and
https://gitlab.com/arpa2/mkhere/-/blob/master/qpid_dispatch.sh
Reporter: Rick van Rein
This sequency installs well:
{{cmake}}
{{ make}}
{{ make DESTDIR=/some/where install}}
However, further use of the installation fails, because of strict dependencies
on the *installed* paths in files like `ProtonConfig.cmake`:
{{ set_target_properties(Proton::core}}
{{ PROPERTIES}}
{{ IMPORTED_LOCATION "/usr/local/lib/libqpid-proton-core.so"}}
{{ IMPORTED_LOCATION_DEBUG "/usr/local/lib/libqpid-proton-core.so"}}
{{ INTERFACE_INCLUDE_DIRECTORIES "${Proton_Core_INCLUDE_DIRS}")}}
**What would work:** First switch to the `DESTDIR`, then continue building
something like Qpid Dispatch Router.
**Solution:** Use relative directories, like in:
{{# Compute the installation prefix relative to this file.}}
{{ get_filename_component(_IMPORT_PREFIX "${CMAKE_CURRENT_LIST_FILE}" PATH)}}
{{ get_filename_component(_IMPORT_PREFIX "${_IMPORT_PREFIX}" PATH)}}
{{ get_filename_component(_IMPORT_PREFIX "${_IMPORT_PREFIX}" PATH)}}
{{ get_filename_component(_IMPORT_PREFIX "${_IMPORT_PREFIX}" PATH)}}
{{ if(_IMPORT_PREFIX STREQUAL "/")}}
{{ set(_IMPORT_PREFIX "")}}
{{ endif()}}
**Work-around:** An unhappy quickfix is
{{ find /some/where -name *.cmake -exec \}}
{{ sed -i "s+/usr/+/some/where/usr/+g" {} \;}}
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