[Patch, Fortran + Testsuite] Fix coarray handling in modules

[Dominique d'Humières]

From a quick test, with the patch I still see the error with -m32

/var/folders/8q/sh_swgz96r7f5vnn08f7fxr00000gn/T//cc8Yz3Jr.s:18:non-relocatable subtraction expression, "__F.caf_token__global_coarrays_MOD_b" minus "L1$pb"
/var/folders/8q/sh_swgz96r7f5vnn08f7fxr00000gn/T//cc8Yz3Jr.s:18:symbol: "__F.caf_token__global_coarrays_MOD_b" can't be undefined in a subtraction expression

but also the test fails at link time with -m64

[Book15] f90/bug% gfc /opt/gcc/work/gcc/testsuite/gfortran.dg/coarray/codimension_2.f90 /opt/gcc/work/gcc/testsuite/gfortran.dg/coarray/codimension_2a.f90 -fcoarray=lib -O2 -lcaf_single
Undefined symbols for architecture x86_64:
  "__F.caf_token__global_coarrays_MOD_b", referenced from:
      __caf_init.0 in ccljvUii.o
      _MAIN__ in ccmqTPwK.o
ld: symbol(s) not found for architecture x86_64
collect2: error: ld returned 1 exit status

Dominique

> Le 3 janv. 2015 à 21:50, Tobias Burnus <burnus@net-b.de> a écrit :
> 
> Dominique Dhumieres wrote:
>> The test gfortran.dg/coarray/codimension_2.f90 fails on x86_64-apple-darwin14 with -m32
>> (see https://gcc.gnu.org/ml/gcc-testresults/2015-01/msg00185.html). The error is
>> [...]
> 
> Yes, there seems to be something wrong. The module has:
> 
>                 U _F.caf_token__global_coarrays_MOD_b
> 0000000000000000 B __global_coarrays_MOD_b
> 
> where the token should not be "U"ndefined but "B". On the other hand, the USEr of the module has:
> 
> 0000000000000000 B _F.caf_token__global_coarrays_MOD_b
>                 U __global_coarrays_MOD_b
> 
> but it should have a "U" – with two users one even would get: "multiple definition of `_F.caf_token__global_coarrays_MOD_b'".
> 
> 
> Untested patch attached.
> 
> Tobias
> <foo.diff>