Re: Linker error with vendor library

[Michael Davidsaver via Tech-talk <tech-talk@aps.anl.gov>]

On 12/6/19 7:24 PM, Mark Rivers via Tech-talk wrote:
> Folks,
> 
> 
> I am trying to build the EPICS Xspress3 driver.  It builds fine on Centos 7 with gcc 4.5
> 
> 
> On Ubuntu 18 with gcc 7.4 I get this error:
> 
> 
> *************
> 
> /usr/bin/ld: /corvette/home/epics/devel/areaDetector-3-8/xspress3-2-2/lib/linux-x86_64-ub18/libimg_mod.a(img_mod_linux.o): relocation R_X86_64_32 against `.rodata' can not be used when making a PIE object; recompile with -fPIC
> /usr/bin/ld: final link failed: Nonrepresentable section on output
> collect2: error: ld returned 1 exit status
> /corvette/usr/local/epics-devel/base-7.0.3.1/configure/RULES_BUILD:212: recipe for target 'xspress3App' failed
> make[1]: *** [xspress3App] Error 1
> 
> *************
> 
> libimg_mod.a is a pre-built library provided by the vendor.  Is there something I can change in the link options to avoid this error, or do we need to get a new library from the vendor?

You could try passing '-no-pie' when linking the xspress3App executable.

Having libimg_mod.a recompiled with -fPIC would probably be the desirable long term solution.

Running

> readelf -r libimg_mod.a |grep R_X86_64_32

might show something interesting, like whether the relocation
is referring to an internal name, or eg. something from libc