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c++: fix 'unsigned __int128_t' semantics [PR108099]

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My earlier patch for 108099 made us accept this non-standard pattern but
messed up the semantics, so that e.g. unsigned __int128_t was not a 128-bit
type.

	PR c++/108099

gcc/cp/ChangeLog:

	* decl.cc (grokdeclarator): Keep typedef_decl for __int128_t.

gcc/testsuite/ChangeLog:

	* g++.dg/ext/int128-8.C: New test.
This commit is contained in:
Jason Merrill 2023-04-18 17:12:17 -04:00
parent 9fdea28d6a
commit ed32ec2669
2 changed files with 28 additions and 2 deletions
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6
gcc/cp/decl.cc
View file

@ -12482,12 +12482,14 @@ grokdeclarator (const cp_declarator *declarator,
key, typedef_decl);
ok = !flag_pedantic_errors;
if (is_typedef_decl (typedef_decl))
type = DECL_ORIGINAL_TYPE (typedef_decl);
{
type = DECL_ORIGINAL_TYPE (typedef_decl);
typedef_decl = NULL_TREE;
}
else
/* PR108099: __int128_t comes from c_common_nodes_and_builtins,
and is not built as a typedef. */
type = TREE_TYPE (typedef_decl);
typedef_decl = NULL_TREE;
}
else if (declspecs->decltype_p)
error_at (loc, "%qs specified with %<decltype%>", key);

24
gcc/testsuite/g++.dg/ext/int128-8.C Normal file
View file

@ -0,0 +1,24 @@
// PR c++/108099
// { dg-do compile { target c++11 } }
// { dg-options "" }
using u128 = unsigned __int128_t;
using s128 = signed __int128_t;
template <typename T, T v> struct integral_constant {
static constexpr T value = v;
};
typedef integral_constant <bool, false> false_type;
typedef integral_constant <bool, true> true_type;
template <class T, class U>
struct is_same : false_type {};
template <class T>
struct is_same <T, T> : true_type {};
static_assert (is_same <__int128, s128>::value, "");
static_assert (is_same <signed __int128, s128>::value, "");
static_assert (is_same <__int128_t, s128>::value, "");
static_assert (is_same <unsigned __int128, u128>::value, ""); // { dg-bogus "" "" { xfail *-*-* } }
static_assert (is_same <__uint128_t, u128>::value, ""); // { dg-bogus "" "" { xfail *-*-* } }
static_assert (sizeof (s128) == sizeof (__int128), "");
static_assert (sizeof (u128) == sizeof (unsigned __int128), "");
static_assert (s128(-1) < 0, "");
static_assert (u128(-1) > 0, "");