commit 520b364da0b20dcb492229757190cc3f30322052
author Jakub Jelinek <jakub@redhat.com> Wed Feb 05 23:35:08 2020 +0100
committer Jakub Jelinek <jakub@redhat.com> Thu Feb 13 21:42:32 2020 +0100
tree 8075b5feac442b73c3ddc555a35b93b5fcdda80f
parent d42f9eaa3e189d4228a4b3a63d02b83fed6385e7

c++: Mark __builtin_convertvector operand as read [PR93557]

In C++ we weren't calling mark_exp_read on the __builtin_convertvector first
argument.  I guess it could misbehave even with lambda implicit captures.

Fixed by calling decay_conversion on the argument, we use the argument as
rvalue so we want the standard lvalue to rvalue conversions, but as the
argument must be a vector type, e.g. integral promotions aren't really
needed.

2020-02-05  Jakub Jelinek  <jakub@redhat.com>

	PR c++/93557
	* semantics.c (cp_build_vec_convert): Call decay_conversion on arg
	prior to passing it to c_build_vec_convert.

	* c-c++-common/Wunused-var-17.c: New test.