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c++: tweak deduction with auto template parms

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While looking at PR105964 I noticed that we were unnecessarily repeating
the deduction loop because of seeing a non-type parameter with type 'auto'.
It is indeed dependent, but not on any other deductions.

gcc/cp/ChangeLog:

	* pt.cc (type_unification_real): An auto tparm can't
	be affected by other deductions.
This commit is contained in:
Jason Merrill 2022-06-22 21:29:16 -04:00
parent d29f61a329
commit 27e9bd9116
1 changed files with 2 additions and 0 deletions
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gcc/cp/pt.cc
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@ -22982,6 +22982,7 @@ type_unification_real (tree tparms,
deduced from a later argument than the one from which
this parameter can be deduced. */
if (TREE_CODE (tparm) == PARM_DECL
&& !is_auto (TREE_TYPE (tparm))
&& uses_template_parms (TREE_TYPE (tparm))
&& saw_undeduced < 2)
{
@ -23042,6 +23043,7 @@ type_unification_real (tree tparms,
if (saw_undeduced == 1
&& TREE_CODE (parm) == PARM_DECL
&& !is_auto (TREE_TYPE (parm))
&& uses_template_parms (TREE_TYPE (parm)))
{
/* The type of this non-type parameter depends on undeduced