$ cat hello.d
import std.stdio;

int main()
{
  writefln("Hello, world");
  return 0;
}

$ gdc hello.d
/usr/bin/ld: /tmp/cc03E6ZO.o: relocation R_X86_64_PC32 against symbol `_D3std6format18__T10FormatSpecTaZ10FormatSpec6__ctorMFNaNbNcNiNfxAaZS3std6format18__T10FormatSpecTaZ10FormatSpec' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: final link failed: Bad value
collect2: error: ld returned 1 exit status
$

Workaround #1: add "-no-pie" to the command line
Workaround #2: add "-funittest" to the command line (!)

It seems that libphobos isn't compiled with options (-fPIC) compatible with default binutils linker requirements.

Just to show that my compiler is up-to-date:

$ dpkg -l | grep "gdc\|phobos"
ii  gdc                                       4:6.2.1-1                            amd64        D compiler (language version 2), based on the GCC backend
ii  gdc-6                                     6.2.1-5                              amd64        GNU D compiler (version 2)
ii  libgphobos-6-dev:amd64                    6.2.1-5                              amd64        Phobos D standard library
ii  libgphobos-dev                            6.2.1-1                              amd64        Phobos D standard library
ii  libgphobos68:amd64                        6.2.1-5                              amd64        Phobos D standard library (runtime library)
$ gdc --version
gdc (Debian 6.2.1-5) 6.2.1 20161124
Copyright (C) 2016 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Am Thu, 22 Dec 2016 18:39:42 +0000
schrieb Sebastien Alaiwan <ace17@free.fr>:

> $ cat hello.d
> import std.stdio;
> 
> int main()
> {
>    writefln("Hello, world");
>    return 0;
> }
> 
> $ gdc hello.d
> /usr/bin/ld: /tmp/cc03E6ZO.o: relocation R_X86_64_PC32 against
> symbol
> `_D3std6format18__T10FormatSpecTaZ10FormatSpec6__ctorMFNaNbNcNiNfxAaZS3std6format18__T10FormatSpecTaZ10FormatSpec'
> can not be used when making a shared object; recompile with
> -fPIC /usr/bin/ld: final link failed: Bad value collect2: error: ld
> returned 1 exit status $
> 
> Workaround #1: add "-no-pie" to the command line
> Workaround #2: add "-funittest" to the command line (!)
> 
> It seems that libphobos isn't compiled with options (-fPIC) compatible with default binutils linker requirements.

Known issue & fixed upstream: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=845377#32 https://github.com/D-Programming-GDC/GDC/pull/261