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Newsgroups: comp.lang.ada
Date: Fri, 4 Sep 2020 03:14:25 -0700 (PDT)
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Subject: Re: gtkada: recompile with -fPIC
From: liyan white <liyanwhite121@gmail.com>
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On Friday, July 31, 2020 at 4:18:00 PM UTC+5:30, hreba wrote:
> Hi,
> 
> I am following the plugin scheme from the GNAT examples, using GTK. So I 
> need gtkada, and for proper tasking with that, gtkada_contributions. 
>  From the Adacore site I grabbed the actual versions (2020) of (binary) 
> GNAT and gtkada. From Dmitry's site I took the gtkada_contributions 
> source code.
> 
> The plugin scheme demands building standalone relocatable libraries 
> (loaded at runtime). So for making (on Linux) I call from a terminal:
>     gtkada-env.sh
>     export GTKADA_BUILD=relocatable
>     gprbuild -Pbase
> My project file base.gpr withs gtkada_contributions_lib.gpr, which is 
> the original project file with the following additions:
>     for Library_Name use "gtkada_contributions";
>     for Library_Dir use "lib";
>     for Library_Kind use "relocatable";
> 
> The above gprbuild command now produces:
> 
> Build Libraries
>     [gprlib]       gtkada_contributions.lexch
>     [link library] libgtkada_contributions.so
> /opt/GNAT/2020/bin/../libexec/gcc/x86_64-pc-linux-gnu/9.3.1/ld: 
> /home/frank/Lib/Ada/gtkada_contributions/gdk-color-ihls.o: relocation 
> R_X86_64_32 against `.rodata' can not be used when making a shared 
> object; recompile with -fPIC
> /opt/GNAT/2020/bin/../libexec/gcc/x86_64-pc-linux-gnu/9.3.1/ld: 
> /home/frank/Lib/Ada/gtkada_contributions/gdk-pixbuf-image.o: relocation 
> R_X86_64_32 against symbol `gdk__pixbuf__image__rgb_imageT' can not be 
> used when making a shared object; recompile with -fPIC
> ...
> and a lot of other, similar lines.
> 
> Adding -fPIC to gtkada_contributions_lib.gpr (compiler switches) didn't 
> change anything, so I guess it is gtkada or even gtk which has to be 
> recompiled. Going ahead alone probably means hours of useless work with 
> the possible result of breaking my system.
> 
> So how can I compile/link my project?
> Will then future projects without relocatable libraries still compile 
> and link?
> -- 
> Frank Hrebabetzky, Kronach	+49 / 9261 / 950 0565