[PATCH] c++: satisfaction value of type const bool [PR104410]

[Patrick Palka via Gcc-patches]

Here constant evaluation of the atomic constraint use_func_v<T> with T=int
sensibly yields an INTEGER_CST of type const bool, but the assert in
satisfaction_value expects unqualified bool.  Let's just relax the
assert to accept cv-qualified bool more generally.

Bootstrapped and regtested on x86_64-pc-linux-gnu, does this look OK for
trunk and 11?

        PR c++/104410

gcc/cp/ChangeLog:

        * constraint.cc (satisfaction_value): Relax assert to accept
        cv-qualified bool.

gcc/testsuite/ChangeLog:

        * g++.dg/cpp2a/concepts-pr104410.C: New test.
---
 gcc/cp/constraint.cc                           | 3 ++-
 gcc/testsuite/g++.dg/cpp2a/concepts-pr104410.C | 6 ++++++
 2 files changed, 8 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/g++.dg/cpp2a/concepts-pr104410.C

diff --git a/gcc/cp/constraint.cc b/gcc/cp/constraint.cc
index cc4df4216ef..06ebbd1d19e 100644
--- a/gcc/cp/constraint.cc
+++ b/gcc/cp/constraint.cc
@@ -2818,7 +2818,8 @@ satisfaction_value (tree t)
     return t;
 
   gcc_assert (TREE_CODE (t) == INTEGER_CST
-             && same_type_p (TREE_TYPE (t), boolean_type_node));
+             && same_type_ignoring_top_level_qualifiers_p (TREE_TYPE (t),
+                                                           boolean_type_node));
   if (integer_zerop (t))
     return boolean_false_node;
   else
diff --git a/gcc/testsuite/g++.dg/cpp2a/concepts-pr104410.C 
b/gcc/testsuite/g++.dg/cpp2a/concepts-pr104410.C
new file mode 100644
index 00000000000..dac08e10a0f
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp2a/concepts-pr104410.C
@@ -0,0 +1,6 @@
+// PR c++/104410
+// { dg-do compile { target c++20 } }
+
+template<class T> constexpr bool use_func_v{};
+template<class T> void f() requires use_func_v<T> || true { }
+template void f<int>();
-- 
2.35.1.46.g38062e73e0