mpir v gmp and problems building for Qt6

[Thomas Baumgart]

On Mittwoch, 25. Dezember 2024 23:26:35 CET Jack Ostroff via KMyMoney-devel wrote:

> Merry Christmas to all.
> 
> In bits of spare time, I've been trying to compile libalkimia and 
> kmymoney for Qt6.  I was having some difficulties getting them to find 
> mpir.  While digging into the details of why, as I read the code, I see 
> KMyMoney prefers MPIR to GMP (from CMakeLists.txt) since 6 years ago.  
> Wikipedia (https://en.wikipedia.org/wiki/MPIR_(mathematics_software)) 
> mentions that "According to the MPIR-devel mailing list, "MPIR is no 
> longer maintained" with a link to 
> https://groups.google.com/g/mpir-devel/c/qTOaOBuS2E4/m/_8AQjEieAAAJ?pli=1 
> which includes "MPIR is no longer maintained for years now." from a post 
> from 23 Dec 2021.  Given this, is there any reason to continue our 
> preference from mpir over mgp?

Not really, something we should change. Although, the preference is only
in alkimia. KMyMoney contains two references to gmpxx.h:

kmymoney/mymoney/mymoneymoney.cpp
21:#include <gmpxx.h>

kmymoney/mymoney/payeeidentifier/ibanbic/ibanbic.cpp
11:#include <gmpxx.h>

and on my distro, mpir is not included so apparently I use gmp for a
long time already.

> Back to the code, without mpir installed, libalkimia seems to find gmp 
> with no problem, but fails later in cmake (which I'll discuss in a 
> separate thread.)  However, running cmake for KMyMoney, I get:
> 
> CMake Error at 
> /usr/share/cmake/Modules/CMakeFindDependencyMacro.cmake:76 (find_package):
>   By not providing "FindGMP.cmake" in CMAKE_MODULE_PATH this project has
>   asked CMake to find a package configuration file provided by "GMP", but
>   CMake did not find one.
> 
>   Could not find a package configuration file provided by "GMP" with any of
>   the following names:
> 
>     GMPConfig.cmake
>     gmp-config.cmake
> 
>   Add the installation prefix of "GMP" to CMAKE_PREFIX_PATH or set 
> "GMP_DIR"
>   to a directory containing one of the above files.  If "GMP" provides a
>   separate development package or SDK, be sure it has been installed.
> Call Stack (most recent call first):
>   /home/jack/KDE/KMM/libalkimia/build6/src/LibAlkimia6Config.cmake:31 
> (find_dependency)
>   CMakeLists.txt:216 (find_package)
> 
> I can find neither GMPConfig.cmake nor gmp-config.cmakeanywhere on my 
> system, but I do have  pkgconfig files gmp.pc and gmpxx.pc. So - why can 
> libalkimia find it but not kmymoney?  I have cmake 3.31.3 installed.  Is 
> my system somehow misconfigured, or have I missed something?

I don't see any reference to GMP nor MPIR in the KMyMoney build instructions:

thb at sy-346-nb /home/thb/devel/kmymoney  (master)$ find -name CMakeLists.txt | xargs grep -i gmp
thb at sy-346-nb /home/thb/devel/kmymoney  (master)$ find -name CMakeLists.txt | xargs grep -i mpir
thb at sy-346-nb /home/thb/devel/kmymoney  (master)$ 

I'd try the following:

- Start with a complete empty build directory and see if that makes a difference.
- In case that does not help, try running cmake with option --trace-expand
  (and maybe redirect output of stdout and stderr to a file). Try to see what
  cmake does, when it fails.


-- 

Regards

Thomas Baumgart

-------------------------------------------------------------
C makes it easy for you to shoot yourself in the foot. C++ makes that
harder, but when you do, it blows away your whole leg.
 -- Bjarne Stroustrup
-------------------------------------------------------------
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