c++: Adding exception specs can changed dependentness

c++: Adding exception specs can changed dependentness

[Nathan Sidwell]

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Making an exception variant can	cause a	non-dependent function type to
become dependent (since c++17 eh-specs are part of the type).  The
same is (possibly?) true for adding a late return type.	 Fixed thusly.
My upcoming local extern-decl changes have a test case that covers
this (which was how I found it).

	gcc/cp/
         * tree.c (build_cp_fntype_variant): Clear
         TYPE_DEPENDENT_P_VALID if necessary.

nathan

-- 
Nathan Sidwell

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diff --git i/gcc/cp/tree.c w/gcc/cp/tree.c
index 8b7c6798ee9..074fa0c025e 100644
--- i/gcc/cp/tree.c
+++ w/gcc/cp/tree.c
@@ -2638,6 +2638,9 @@ build_cp_fntype_variant (tree type, cp_ref_qualifier rqual,
 
   /* Need to build a new variant.  */
   v = build_variant_type_copy (type);
+  if (!TYPE_DEPENDENT_P (v))
+    /* We no longer know that it's not type-dependent.  */
+    TYPE_DEPENDENT_P_VALID (v) = false;
   TYPE_RAISES_EXCEPTIONS (v) = raises;
   TYPE_HAS_LATE_RETURN_TYPE (v) = late;
   switch (rqual)