http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47030
Erik Toussaint <eh.toussaint at gmail dot com> changed:
What |Removed |Added
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CC| |eh.toussaint at gmail dot
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--- Comment #3 from Erik Toussaint <eh.toussaint at gmail dot com> 2012-03-02
22:17:52 UTC ---
(In reply to comment #0)
For both program units, if I add 'implicit none' I get the following error:
!GCC$ attributes dllexport :: mydata
1
Error: Symbol 'mydata' at (1) has no IMPLICIT type
So 'mydata' is treated as the identifier of a local entity. Which makes sense,
because a common block and a local entity can have the same name (with certain
restrictions; see 16.3.1 and 16.3.2 in f2008).
Looking at the syntax of the Intel Fortran compiler, the name of the common
block has to be between slashes:
!DEC$ ATTRIBUTES DLLEXPORT :: /X/
http://software.intel.com/sites/products/documentation/hpc/compilerpro/en-us/fortran/win/compiler_f/bldaps_for/win/bldaps_share_datadlls.htm
Trying this with gfortran gives an error:
!GCC$ attributes dllexport :: /mydata/
1
Error: Invalid character in name at (1)
P.s.:
> !-------------------------
> module m
> real :: x
> common /mydata/ x
> !GCC$ attributes dllexport :: mydata
> end module
> !-------------------------
>
> I get the warning:
>
> f951: warning: ‘dllexport’ attribute directive ignored [-Wattributes]
I get an error (I'm using MinGW GCC 4.6.2):
m.f90:5:0: error: external linkage required for symbol 'mydata' because of
'dlle
xport' attribute
