Am Thu, 26 Apr 2012 21:24:46 -0700
schrieb bcs <[email protected]>:
> On 04/26/2012 05:37 AM, Steven Schveighoffer wrote:
> >
> > versions should be defined for the *entire program*, not just for
> > certain files. And if they are defined just for certain files, define
> > them in the file itself.
> >
>
> Versions should be defined for the *entire program*, not just for
> whatever you happen to be compiling right now.
>
> Is there any way to make different modules complain if you link object
> files built with diffident versions set?
You would need to modify the linker (optlink/ld) to understand that two object
files compiled by a D compiler include a section that informs it about enabled
version tags, or maybe abuse existing systems to the end that the poor
programmer mixing versions up gets a generic error message that doesn't make
any sense.
But more importantly, you can bundle up object files into .a archives aka
static _libraries_ with yet another tool, I think ar is its name. It would not
work out if e.g. GtkD compiled its static libraries with one set of versions
and you compile your app with another set. Or in contrast, you would have to
enable versions like 'cairo_new_backend', 'druntime_use_old_gc',
'whatever_any_other_object_file_was_compiled_with' for your program, even if
you don't need them.
To sort that mess out again, the compiler would have to create a list of
versions that affect the currently compiled module at all. It would then find
out that for your program 'druntime_use_old_gc' is irrelevant and exclude it
from the version check.
my_app GtkD Phobos <conflicts?>
my_ver on - - no
unused off - - no
cairo_new_backend - on - no
druntime_use_old_gc - - off no
debug on off off yes
X86_64 on - on no
In this case the linker would complain only about a version named 'debug' that
was enabled in your application, but not for the object files of GtkD and
Phobos.
--
Marco
P.S.: Can I have a software patent on this?
