[Bug binutils/14539] ar can't generate correct archive

[vapier at gentoo dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=14539

Mike Frysinger <vapier at gentoo dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |NOTABUG
                 CC|                            |vapier at gentoo dot org
             Status|NEW                         |RESOLVED

--- Comment #1 from Mike Frysinger <vapier at gentoo dot org> ---
i am by no means a fortran expert, so if i misunderstand how it works, feel
free to correct & reopen

the fact that this linking works:
> gfortran test_a.o lib_a.a -o a.exe

implies that the `use refs_a` is a "weak reference".  that means the linker is
not required to pull in objects from an archive (.a) to satisfy such symbols
alone.  this is how the linker has always behaved, and is always going to
behave.

if you want to force linking in all the objects from the archive, you can use
the --whole-archive option like:
  gfortran test_a.o -Wl,--whole-archive lib_a.a -Wl,--no-whole-archive -o a.exe

from ar's pov, it is working correctly: it created an archive with an object. 
it has nothing else to do.

from ld's pov, it is working correctly: the symbol is already satisfied, and
there's no objects it needs to pull out of the .a to satisfy missing symbols.

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