Compilation error in CI when building Konqueror for KF6 on linux

[Stefano Crocco]

Hello to everyone,
I successfully ported Konqueror to KF6, at least to the point that, on my 
system, it compiles correctly. However, when the CI tries to build it on 
linux, it fails with the following error:

/usr/lib64/gcc/x86_64-suse-linux/13/../../../../x86_64-suse-linux/bin/ld: 
../../lib/libkcm_konqhtml_static.a(mocs_compilation.cpp.o): relocation 
R_X86_64_32S against `.rodata' can not be used when making a shared object; 
recompile with -fPIC

The full build log is in the attachment; the error is on line 1674.

This error doesn't happen when I try to compile Konqueror on my system, which 
seems to have the same gcc version as the CI and doesn't happen on the CI with 
freebsd and with the KF5 version, despite the fact that the, as far as I can 
tell, involved code hasn't changed.

It seems that the error comes from the attempt to link several plugins 
(actually KCMs) to a static library (kcm_konqhtml_static).

Searching on Google, I found that the suggested solution for this kind of 
error is to add the -fPIC compilation flag when building the static library. I 
tried to do so and it worked but I'd like to understand whether this actually 
is the correct solution and why the issue only happens on the CI linux build 
for KF6 and not on the CI builds for KF5, on the CI freebsd build for KF6 and 
on my system. Can anyone give me some hints about this?

Thanks in advance

Stefano
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