[patch ld/dlltool]: Allow empty LIBRARY statement in .def file

[Christopher Faylor]

On Wed, Jul 25, 2012 at 11:13:02PM +0200, Kai Tietz wrote:
>Hi,
>
>this patch relax behavior of dlltool and ld about .def file parsing so
>that the name of LIBRARY statement is optional.
>
>ChangeLog
>
>binutils/
>2012-07-25  Kai Tietz
>
>        * defparse.y (command): Call def_library only if name isn't
>NULL and not empty.
>
>ld/
>
>2012-07-25  Kai Tietz
>
>        * deffilep.y (command): Call def_image_name only if name isn't
>NULL and not empty.
>
>Regression tested for x86_64-w64-mingw32, i686-w64-mingw32, and
>i686-pc-cygwin.  ok for apply?
>
>Regards,
>Kai
>
>Index: defparse.y
>===================================================================
>RCS file: /cvs/src/src/binutils/defparse.y,v
>retrieving revision 1.14
>diff -u -r1.14 defparse.y
>--- defparse.y  24 Feb 2012 14:20:16 -0000      1.14
>+++ defparse.y  25 Jul 2012 20:56:31 -0000
>@@ -52,7 +52,12 @@
>
> command:
>                NAME opt_name opt_base { def_name ($2, $3); }
>-       |       LIBRARY opt_name opt_base option_list { def_library ($2, $3); }
>+       |       LIBRARY opt_name opt_base option_list
>+               {
>+                 /* Ignore LIBRARY without argument, or empty name.  */
>+                 if ($2 && $2[0] != 0)
>+                   def_library ($2, $3);
>+               }

It seems like def_library() is also making decisions based on its first
parameter.  This test will short-circuit those tests.  It seems like
either this should all be handled in def_library or the tests in
def_library() should be deleted.

cgf