[gcc/devel/c++-modules] libstdc++: Do not define __cpp_lib_constexpr_algorithms in <utility>
Nathan Sidwell
nathan@gcc.gnu.org
Thu May 7 16:32:29 GMT 2020
https://gcc.gnu.org/g:2025db692e9ed1192f831bc122413a226987515c
commit 2025db692e9ed1192f831bc122413a226987515c
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Wed Apr 22 22:54:35 2020 +0100
libstdc++: Do not define __cpp_lib_constexpr_algorithms in <utility>
The C++20 draft and SD-6 both say this should only be in <version> and
<algorithm>, not in <utility>.
* include/std/utility (__cpp_lib_constexpr_algorithms): Do not define
here.
* testsuite/20_util/exchange/constexpr.cc: Do not expect macro to be
defined by <utility>.
Diff:
---
libstdc++-v3/ChangeLog | 5 +++++
libstdc++-v3/include/std/utility | 8 ++------
libstdc++-v3/testsuite/20_util/exchange/constexpr.cc | 6 ------
3 files changed, 7 insertions(+), 12 deletions(-)
diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 4e86ec188a5..4fec7b21029 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,5 +1,10 @@
2020-04-22 Jonathan Wakely <jwakely@redhat.com>
+ * include/std/utility (__cpp_lib_constexpr_algorithms): Do not define
+ here.
+ * testsuite/20_util/exchange/constexpr.cc: Do not expect macro to be
+ defined by <utility>.
+
* include/std/functional (__cpp_lib_concepts): Update macro value to
indicate P1964R2 support.
* include/std/version (__cpp_lib_concepts): Likewise.
diff --git a/libstdc++-v3/include/std/utility b/libstdc++-v3/include/std/utility
index dc6e8468af5..5f1675a7679 100644
--- a/libstdc++-v3/include/std/utility
+++ b/libstdc++-v3/include/std/utility
@@ -238,7 +238,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
get(const std::pair<_Tp1, _Tp2>&& __in) noexcept
{ return __pair_get<_Int>::__const_move_get(std::move(__in)); }
-#if __cplusplus > 201103L
+#if __cplusplus >= 201402L
#define __cpp_lib_tuples_by_type 201304
@@ -284,10 +284,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
#define __cpp_lib_exchange_function 201304
-#if __cplusplus > 201703L
-# define __cpp_lib_constexpr_algorithms 201806L
-#endif
-
/// Assign @p __new_val to @p __obj and return its previous value.
template <typename _Tp, typename _Up = _Tp>
_GLIBCXX20_CONSTEXPR
@@ -295,7 +291,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
exchange(_Tp& __obj, _Up&& __new_val)
{ return std::__exchange(__obj, std::forward<_Up>(__new_val)); }
-#endif
+#endif // C++14
// Stores a tuple of indices. Used by tuple and pair, and by bind() to
// extract the elements in a tuple.
diff --git a/libstdc++-v3/testsuite/20_util/exchange/constexpr.cc b/libstdc++-v3/testsuite/20_util/exchange/constexpr.cc
index 3673772ea4b..ee6cbaebdee 100644
--- a/libstdc++-v3/testsuite/20_util/exchange/constexpr.cc
+++ b/libstdc++-v3/testsuite/20_util/exchange/constexpr.cc
@@ -20,12 +20,6 @@
#include <utility>
-#ifndef __cpp_lib_constexpr_algorithms
-# error "Feature-test macro for constexpr algorithms missing"
-#elif __cpp_lib_constexpr_algorithms < 201806L
-# error "Feature-test macro for constexpr algorithms has wrong value"
-#endif
-
constexpr bool
test()
{
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