On Wed, Aug 11, 2021 at 09:42:56AM -0400, Jason Merrill wrote:
> Checking CLASS_TYPE_P && decl_in_std_namespace (TYPE_MAIN_DECL) before
> looking at the name makes sense to me.
CLASS_TYPE_P is cheap, but isn't decl_in_std_namespace, especially when
it needs to walk inline namespaces, better done only if we get a match, so
like below?
Though I can do it even in the first if if you think it is better...
2021-08-11 Jakub Jelinek <ja...@redhat.com>
gcc/cp/
PR c++/94162
* method.c (cat_tag_for): Return cc_last for !CLASS_TYPE_P
or for classes not in std namespace.
gcc/testsuite/
PR c++/99429
* g++.dg/cpp2a/spaceship-synth11.C: New test.
PR c++/94162
* g++.dg/cpp2a/spaceship-synth-neg6.C: New test.
--- gcc/cp/method.c.jj 2021-08-09 15:03:00.923206463 +0200
+++ gcc/cp/method.c 2021-08-11 15:52:27.157437691 +0200
@@ -1029,10 +1029,13 @@ is_cat (tree type, comp_cat_tag tag)
static comp_cat_tag
cat_tag_for (tree type)
{
+ if (!CLASS_TYPE_P (type))
+ return cc_last;
for (int i = 0; i < cc_last; ++i)
{
comp_cat_tag tag = (comp_cat_tag)i;
- if (is_cat (type, tag))
+ if (is_cat (type, tag)
+ && decl_in_std_namespace_p (TYPE_MAIN_DECL (type)))
return tag;
}
return cc_last;
--- gcc/testsuite/g++.dg/cpp2a/spaceship-synth11.C.jj 2021-08-11
15:49:05.267204333 +0200
+++ gcc/testsuite/g++.dg/cpp2a/spaceship-synth11.C 2021-08-11
15:49:05.267204333 +0200
@@ -0,0 +1,29 @@
+// PR c++/99429
+// { dg-do compile { target c++20 } }
+
+namespace std {
+struct strong_ordering {
+ int _v;
+ constexpr strong_ordering (int v) :_v(v) {}
+ constexpr operator int (void) const { return _v; }
+ static const strong_ordering less;
+ static const strong_ordering equal;
+ static const strong_ordering greater;
+};
+constexpr strong_ordering strong_ordering::less = -1;
+constexpr strong_ordering strong_ordering::equal = 0;
+constexpr strong_ordering strong_ordering::greater = 1;
+}
+
+template <unsigned long N>
+struct duration {
+ static constexpr const long period = N;
+ constexpr duration (void) = default;
+ constexpr duration (const duration& d) = default;
+ constexpr bool operator== (const duration& d) const = default;
+ constexpr bool operator<=> (const duration& d) const = default;
+ long _d;
+};
+
+using nanoseconds = duration<1>;
+using microseconds = duration<nanoseconds::period * 1000>;
--- gcc/testsuite/g++.dg/cpp2a/spaceship-synth-neg6.C.jj 2021-08-11
15:49:05.268204320 +0200
+++ gcc/testsuite/g++.dg/cpp2a/spaceship-synth-neg6.C 2021-08-11
15:49:05.268204320 +0200
@@ -0,0 +1,11 @@
+// PR c++/94162
+// { dg-do compile { target c++20 } }
+
+#include <compare>
+
+struct S {
+ int a; // { dg-error "three-way comparison of 'S::a'
has type 'std::strong_ordering', which does not convert to 'int\\*'" }
+ int *operator<=>(const S&) const = default;
+};
+
+bool b = S{} < S{}; // { dg-error "use of deleted function
'constexpr int\\* S::operator<=>\\\(const S&\\\) const'" }
Jakub
