I'm not sure what semantics we might eventually want for vector <=>, but let's
give a sorry for now.
Tested x86_64-pc-linux-gnu, applying to trunk.
---
gcc/cp/typeck.c | 7 +++++++
gcc/testsuite/g++.dg/cpp2a/spaceship-vec1.C | 11 +++++++++++
2 files changed, 18 insertions(+)
create mode 100644 gcc/testsuite/g++.dg/cpp2a/spaceship-vec1.C
diff --git a/gcc/cp/typeck.c b/gcc/cp/typeck.c
index 124d16a31fb..ff603f3d8d9 100644
--- a/gcc/cp/typeck.c
+++ b/gcc/cp/typeck.c
@@ -5224,6 +5224,13 @@ cp_build_binary_op (const op_location_t &location,
"types %qT and %qT", type0, type1);
}
+ if (resultcode == SPACESHIP_EXPR)
+ {
+ if (complain & tf_error)
+ sorry_at (location, "three-way comparison of vectors");
+ return error_mark_node;
+ }
+
/* Always construct signed integer vector type. */
intt = c_common_type_for_size
(GET_MODE_BITSIZE (SCALAR_TYPE_MODE (TREE_TYPE (type0))), 0);
diff --git a/gcc/testsuite/g++.dg/cpp2a/spaceship-vec1.C
b/gcc/testsuite/g++.dg/cpp2a/spaceship-vec1.C
new file mode 100644
index 00000000000..83547691118
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp2a/spaceship-vec1.C
@@ -0,0 +1,11 @@
+// { dg-do compile { target c++2a } }
+
+#include <compare>
+
+#define vector __attribute__((vector_size(4*sizeof(int)) ))
+
+int main()
+{
+ vector int a, b;
+ a <=> b; // { dg-message "three-way comparison of vector" }
+}
base-commit: f15dc29a9734e360497f5bb40be6b25dcbc11645
--
2.18.1
