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Subject: Re: Darwin linker error "illegal text-relocation" with -shared
To: "Ryan S. Elliott" <relliott@umn.edu>, fortran@gcc.gnu.org
References: <alpine.OSX.2.21.1804161104240.38779@er-10-128-80-101.wireless.umn.edu>
From: Thomas Koenig <tkoenig@netcologne.de>
Message-ID: <dd809f00-65c1-954b-1c6e-cc8749e07739@netcologne.de>
Date: Mon, 16 Apr 2018 18:20:00 -0000
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Hello Ryan,

> foo.f90
> ----------------------------------------------
> module foo contains
>    subroutine bar
>      use, intrinsic :: iso_c_binding
>      call gee(c_funloc(gee))
>    end subroutine
>    subroutine gee(f) bind(c)
>      use, intrinsic :: iso_c_binding
>      type(c_funptr) :: f
>    end subroutine
> end module foo
> ----------------------------------------------
> 
> $ gfortran-7 -shared foo.f90

You are invoking gfortran without the "-c" option, so it expects to
generate an executable. Yet, you specify "-shared", which only makes
sense for a library, and your source code does not contain a main
program.

What happens if you run

"gfortran -c -shared foo.f90" ?