c++: non-dependent .* operand folding [PR112427]

Here when building up the non-dependent .* expression, we crash from
fold_convert on 'b.a' due to this (templated) COMPONENT_REF having an
IDENTIFIER_NODE instead of FIELD_DECL operand that middle-end routines
expect.  Like in r14-4899-gd80a26cca02587, this patch fixes this by
replacing the problematic piecemeal folding with a single call to
cp_fully_fold.  Also, don't bother building the POINTER_PLUS_EXPR in a
template context.  This means the returned non-dependent tree might not
have TREE_SIDE_EFFECTS set when it used to, so we need to compensate
by making build_min_non_dep propagate TREE_SIDE_EFFECTS from the original
arguments like buildN and build_min do.

	PR c++/112427

gcc/cp/ChangeLog:

	* tree.cc (build_min_non_dep): Propagate TREE_SIDE_EFFECTS from
	the original arguments.
	(build_min_non_dep_call_vec): Likewise.
	* typeck2.cc (build_m_component_ref): Use cp_convert, build2 and
	cp_fully_fold instead of fold_build_pointer_plus and fold_convert.
	Don't build the POINTER_PLUS_EXPR in a template context.

gcc/testsuite/ChangeLog:

	* g++.dg/template/non-dependent29.C: New test.

0 files changed, 0 insertions, 0 deletions