c++: Test for whitespace and line splice

From wg21.link/P2223R2

gcc/testsuite/ChangeLog:

	* g++.dg/cpp23/whitespace-splice1.C: New test.

diff --git a/gcc/testsuite/g++.dg/cpp23/whitespace-splice1.C b/gcc/testsuite/g++.dg/cpp23/whitespace-splice1.C
new file mode 100644 (file)
index 0000000..f115ce0
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp23/whitespace-splice1.C
@@ -0,0 +1,15 @@
+// Tests from P2223R2
+// { dg-additional-options -w }
+// { dg-do compile { target c++11 } }
+
+constexpr auto str = "\ 
+";
+
+static_assert(__builtin_strlen(str) == 0, "");
+
+constexpr int i = 1
+  // \ 
+  + 42
+  ;
+
+static_assert(i == 1, "");