--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/cpp2a/inline-asm2.C	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,17 @@
+// P1668R1: Permit unevaluated inline asm in constexpr functions
+// PR c++/91346
+// { dg-do compile { target c++2a } }
+
+constexpr int
+foo (bool b)
+{
+  if (b)
+    return 42;
+  asm (""); // { dg-error "inline assembly is not a constant expression" }
+// { dg-message "only unevaluated inline assembly" "" { target *-*-* } .-1 }
+  return -1;
+}
+
+constexpr int i = foo (true);
+static_assert(i == 42, "");
+constexpr int j = foo (false); // { dg-message "in .constexpr. expansion of" }