GDC and Tango problem

[Steven Schveighoffer]

On Tue, 29 Dec 2009 16:34:20 -0500, grauzone <none at example.net> wrote:

> revcompgeek wrote:
>>  So I tried building Tango trunk a while ago, and it actually built
>> surprisingly well, with only one small error I was able to fix. So I
>> installed the tango library and proceeded to test if tango was really
>> working. So in hello.d:
>>  import tango.io.Stdout;
>> void main(){ Stdout("Hello {}!","World").newline; }
>>  I don't know why, but I had to manually add object.d to the command
>> line. To simplify, I put an object file of object.d into the current
>> directory.
>>  tests% gdc -o hello hello.d object.o -lgtango -lgphobos
>> ld: duplicate symbol __D6object9Interface6__initZ in
>> /usr/local/lib/libgphobos.a(object.o) and object.o
>> collect2: ld returned 1 exit status
>>  I'm not sure if this problem is an issue with gdc or a problem with
>> Tango. Any ideas on how to fix this?
>
> You're linking with both Phobos and Tango. You can't do that, because  
> both come with their own (incompatible) runtime. Removing the  
> "-lgphobos" should work.

I think you need -lgphobos.  Last time gdc was updated, the compiler  
called the runtime gphobos, even though it was just the runtime :)  Even  
with dmd, tango needed to call the runtime libphobos to get it to link  
because the name was hard-coded in the compiler.  Subsequent versions of  
dmd allowed changing the runtime library name.  I don't know if gdc was  
updated to do the same.

I think the problem is adding object.d to the command line, you should not  
have to do that.  The user is probably missing object.di.  I'm not sure  
how well the latest tango works with gdc.  It's probably better to ask on  
the tango forums (http://www.dsource.org/projects/tango/forums).

-Steve