[patch, gfortran] PR 22607 again: Return-by-reference functions in modules

[Erik Edelmann <erik dot edelmann at iki dot fi>]

When I wrote a patch to fix PR 22607 some time ago
(http://gcc.gnu.org/ml/fortran/2005-11/msg00253.html), I forgot
to check if there were other places where functions were declared
to be "backend-pure", leaving external/module pure
return-by-reference functions still non-working.  This patch
should fix the problem once and for all (I hope).

Reg.tested on Linux/x86, on trunk, 4.1 and 4.0.  Ok to commit?


        Erik


2005-12-29  Erik Edelmann  <eedelman@gcc.gnu.org>

        PR fortran/22607
        * trans-decl.c(gfc_get_extern_function_decl): Don't set 
        DECL_IS_PURE (fndecl) = 1 for return-by-reference
        functions.


2005-12-29  Erik Edelmann  <eedelman@gcc.gnu.org>

        PR fortran/22607
        * gfortran-dg/pure_byref_3.f90: New.

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