PR c++/8570 line number in error message is badly placed with illegal template friend declaration

[Manuel López-Ibáñez]

:ADDPATCH c++:

The problem here is that input_location points to the start of the
declaration of the class instead of the point where the friend
template is being declared.

bootstrapped and regression tested with --enable-languages=all on
x86_64-unknown-linux-gnu

OK to commit?

2007-11-11  Manuel Lopez-Ibanez  <manu@gcc.gnu.org>

cp/
  * pt.c (redeclare_class_template): Update error message. Use a note
to show the previous declaration.
  (tsubst_friend_class): Use the location of the friend template as
the input location before calling redeclare_class_template.

testsuite/
  * g++.old-deja/g++.ns/template13.C: Update expected output.
  * g++.old-deja/g++.pt/friend23.C: Likewise.
  * g++.dg/warn/pr8570.C: New.
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