[CMake] Problems with static jpeg library

[Eric Noulard]

Le mar. 11 sept. 2018 à 16:10, <world at masterdevops.eu> a écrit :

> Hi,
>
> thank you for your reply. I could solve the problem. The part I didn't
> knew was that static libraries also needed to be compiled with -fPIC.
> I've found a good summary of this topic at
> https://lists.debian.org/debian-devel/2016/05/msg00309.html
> I want to share it for those, who also stumble upon this problem.
>


And for project using CMake as build system one can use,
POSITION_INDEPENDENT_CODE
target property:
https://cmake.org/cmake/help/latest/prop_tgt/POSITION_INDEPENDENT_CODE.html#prop_tgt:POSITION_INDEPENDENT_CODE
or globally:
https://cmake.org/cmake/help/latest/variable/CMAKE_POSITION_INDEPENDENT_CODE.html#variable:CMAKE_POSITION_INDEPENDENT_CODE

in order to enable such flags.



>
> On 2018-09-11 13:47, Rolf Eike Beer wrote:
> > world at masterdevops.eu wrote:
> >> Hi,
> >>
> >> I am trying to compile the project libgd
> >> (https://github.com/libgd/libgd) with the option ENABLE_JPEG enabled.
> >>
> >> I.e. first I downloaded the source code of libjpeg-turbo from
> >> https://sourceforge.net/projects/libjpeg-turbo/files/2.0.0/, compiled
> >> it
> >
> > You need to make sure that this compile includes -fPIC in the
> > compileflags of
> > libjpeg.
> >
> >> But I get several errors like this one:
> >> > /usr/bin/ld: .../libjpeg-turbo-2.0.0/libjpeg.a(jcmainct.c.o):
> >> > relocation R_X86_64_32S against `.text' can not be used when making a
> >> > shared object; recompile with -fPIC
> >
> > As said here.
> >
> > Eike
> > --
>
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-- 
Eric
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