Darwin linker error "illegal text-relocation" with -shared

[Ryan S. Elliott]

On Mon, 16 Apr 2018, Thomas Koenig wrote:

> OK, so I haven't played around with shared libraries a lot.
>
>> In other words, the -c flag overrides the -shared flag.  This is not what I 
>> want.  I want to create a shared library which is done by the linker.
>
> When I run "gfortran -shared foo.f90" on Linux, I get
>
> /usr/bin/ld: /tmp/ccixEBK9.o: relocation R_X86_64_32 against `.rodata' can 
> not be used when making a shared object; recompile with -fPIC
> /usr/bin/ld: final link failed: Nonrepresentable section on output
> collect2: Fehler: ld gab 1 als Ende-Status zurück
>
> whereas "gfortran -shared -fPIC foo.f90" works.
>
> Is it advisable to compile a shared library without position-independent
> code?
>

No, you are right.   I should have included the -fPIC flag, but this doesn't 
change the results:


$ gfortran-7 -shared -fPIC foo.f90
ld: illegal text-relocation to '_gee' in /var/folders/q0/mth73zrd307d66c43f8r3xv80000gp/T//ccG1nHc0.o from 'lC0' in /var/folders/q0/mth73zrd307d66c43f8r3xv80000gp/T//ccG1nHc0.o for architecture x86_64
collect2: error: ld returned 1 exit status


As indicated in the subject linek, this is only an issue on macOS (Darwin), it 
all works just fine on linux...


Ryan