Dll entry point aliasing

[John Barnes <johnbarnes2858 at gmail dot com>]

I have a FORTRAN dll that I have compiled and used in a couple of
FORTRAN dialects. Seems that gFORTRAN (used in the MinGW32 environment
on Windows 7) sees the entry points a little differently.

This is how one of the entry points is defined in the FORTRAN code:

subroutine XXXX_ENGINE_INITIALISE(args, success_code)
    !DEC$ ATTRIBUTES DLLEXPORT :: XXXX_ENGINE_INITIALISE
    !DEC$ ATTRIBUTES ALIAS:'_XXXX_ENGINE_INITIALISE' ::
XXXX_ENGINE_INITIALISE
    character(*), intent(in) :: args
    integer, intent(out) :: success_code ! 0: ok, -ive fatal error, +ive warning

The above is used with C# calling code like:

        [DllImport(ExternalDll_C.Filename,
            EntryPoint = "XXXX_ENGINE_INITIALISE",
            ExactSpelling = false,
            CallingConvention = CallingConvention.Cdecl)
        ]
        internal static extern void XXXX_ENGINE_INITIALISE(
            [MarshalAs(UnmanagedType.LPStr)] StringBuilder inString,
            ref int successCode, // 0: ok, -ive fatal error, +ive warning
            int inStringLength);

Compile the above with other dialects of FORTRAN I have available and
Dependency Walker shows the dll has the expected entry point
XXXX_ENGINE_INITIALISE.

Compile using gFORTRAN and the entry point comes out as:

        xxxx_engine_initialise_

I suspect that gFORTRAN does not recognise the DEC$ comment directives
and just applies its own name mangling. Is there a way I can change
that? Ideally with some other comment directive?

Thanks.