[Bug fortran/47260] New: DLLEXPORT attribute requires additional capabilities to be useful

["craig.powers at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47260

           Summary: DLLEXPORT attribute requires additional capabilities
                    to be useful
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: craig.powers@gmail.com


With the following mingw gfortran package:
Using built-in specs.
COLLECT_GCC=gfortran
COLLECT_LTO_WRAPPER=c:/program
files/gfortran/bin/../libexec/gcc/i586-pc-mingw32
/4.6.0/lto-wrapper.exe
Target: i586-pc-mingw32
Configured with: ../gcc-trunk/configure --prefix=/mingw
--enable-languages=c,for
tran --with-gmp=/home/brad/gfortran/dependencies --disable-werror
--enable-threa
ds --disable-nls --build=i586-pc-mingw32 --enable-libgomp --disable-shared
--dis
able-win32-registry --with-dwarf2 --disable-sjlj-exceptions --enable-lto
Thread model: win32
gcc version 4.6.0 20101201 (experimental) [trunk revision 167359] (GCC)


If I build a standalone function declared as:
INTEGER FUNCTION test()
!GCC$ ATTRIBUTES STDCALL, DLLEXPORT :: test

test = 1

END FUNCTION test

and build it with:
gfortran -std=f2008 -march=native -c bug.f90

The result is:
bug.f90:1:0: error: external linkage required for symbol 'test' because of
'dlle
xport' attribute


I believe that either something is not being set correctly for symbol 'test',
or an additional attribute needs to be made available so that 'test' can be
marked correctly.  In the absence of this, the manual should clearly state that
dllexport cannot be applied to procedures in Windows.