More libalkimia problems/questions was: problems compiling 4.8 on system with both qt4 and qt5

[Ralf Habacker]

Am 01.11.2016 um 00:05 schrieb Jack:

> For Gentoo, if two versions are coinstallable, they get assigned to
> different "slots" and in this case, I think the slot number would
> easily correspond to the qt version (4 or 5) to align with other qt
> and kde packages.  Also, as Gentoo is a source based distro, they
> really cannot install any files with the same name, so the base
> libalkimia.so should go to libalkimia4.so and libalkimia5.so.  (One of
> them could stay libalkimia.so, but why not make things consistent if
> were changing that much anyway?)
>
Collecting all requirements we get the following installation path layout: 

Alikima 6.0.90 Qt4: [on a x86_64 system using /usr/local install prefix]
-- Installing: /usr/local/lib64/libalkimia4.so.6.0.90
-- Installing: /usr/local/lib64/libalkimia4.so.6
-- Installing: /usr/local/lib64/libalkimia4.so
-- Installing: /usr/local/lib64/cmake/LibAlkimia4-6.0/LibAlkimia4Targets.cmake
-- Installing: /usr/local/lib64/cmake/LibAlkimia4-6.0/LibAlkimia4Targets-noconfig.cmake
-- Installing: /usr/local/include/alkimia4-6.0/alkimia/alkvalue.h
-- Installing: /usr/local/include/alkimia4-6.0/alkimia/alkquoteitem.h
-- Installing: /usr/local/include/alkimia4-6.0/alkimia/alkcompany.h
-- Installing: /usr/local/include/alkimia4-6.0/alkimia/alk_export.h
-- Installing: /usr/local/lib64/cmake/LibAlkimia4-6.0/LibAlkimia4Config.cmake [1]
-- Installing: /usr/local/lib64/cmake/LibAlkimia4-6.0/LibAlkimia4ConfigVersion.cmake
-- Installing: /usr/local/lib64/cmake/LibAlkimia4-6.0/FindGMP.cmake
-- Installing: /usr/local/lib64/pkgconfig/libalkimia4.pc [2]

[1] with LIBALKIMIA4_INCLUDE_DIR=${PACKAGE_PREFIX_DIR}/include/alkimia4-6.0/ and LIBALKIMIA4_LIBRARIES=${PACKAGE_PREFIX_DIR}/lib64/libalkimia4.so.6.0.90
[2] with includedir=include/alkimia4-6.0 and Libs:-lalkimia4

Alkimia 6.0.90 Qt5:  [on a x86_64 system using /usr/local install prefix]
-- Installing: /usr/local/lib64/libalkimia5.so.6.0.90
-- Installing: /usr/local/lib64/libalkimia5.so.6
-- Installing: /usr/local/lib64/libalkimia5.so
-- Installing: /usr/local/lib64/cmake/LibAlkimia5-6.0/LibAlkimia5Targets.cmake
-- Installing: /usr/local/lib64/cmake/LibAlkimia5-6.0/LibAlkimia5Targets-noconfig.cmake
-- Installing: /usr/local/include/alkimia5-6.0/alkimia/alkvalue.h
-- Installing: /usr/local/include/alkimia5-6.0/alkimia/alkquoteitem.h
-- Installing: /usr/local/include/alkimia5-6.0/alkimia/alkcompany.h
-- Installing: /usr/local/include/alkimia5-6.0/alkimia/alk_export.h
-- Installing: /usr/local/lib64/cmake/LibAlkimia5-6.0/LibAlkimia5Config.cmake [1]
-- Installing: /usr/local/lib64/cmake/LibAlkimia5-6.0/LibAlkimia5ConfigVersion.cmake
-- Installing: /usr/local/lib64/cmake/LibAlkimia5-6.0/FindGMP.cmake
-- Installing: /usr/local/lib64/pkgconfig/libalkimia5.pc [2]

[1] with LIBALKIMIA5_INCLUDE_DIR=${PACKAGE_PREFIX_DIR}/include/alkimia5-6.0/ and LIBALKIMIA5_LIBRARIES=${PACKAGE_PREFIX_DIR}/lib64/libalkimia5.so.6.0.90
[2] with includedir=include/alkimia5-6.0 and Libs:-lalkimia5


On the client side this would required to use 

if(QT4_FOUND)
   find_package(LibAalkimia4)
   if(NOT LIBALKIMIA4_FOUND)
	find_package(LibAalkimia)
   endif()
else()
   find_package(LibAalkimia5)
endif()

if(QT4_FOUND)
   set(QT_SLOT 4)
else()
   set(QT_SLOT 5)
endif()

find_package(LibAalkimia${QT_SLOT})
...

|add_executable(<target> ...) target_link_libraries(<target>
Alkimia::alkimia)|

BTW: Using the '4' slot has also the advantage to not conflict with the present cmake find module for version 4.3.2 which already results in some detection issues.

If that is accepted I would provide a pull or review request for alkimia with a related patch. 

Cheers
Ralf 

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