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libstdc++: Enable type traits for wchar_t unconditionally [PR98725]

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None of these traits depend on libc support for wchar_t, so they should
be defined unconditionally. The wchar_t type is always defined in C++.

libstdc++-v3/ChangeLog:

	PR libstdc++/98725
	* include/c_global/cstddef [!_GLIBCXX_USE_WCHAR_T]
	(__byte_operand<wchar_t>): Define specialization.
	* include/std/type_traits (__make_signed<wchar_t>)
	(__make_unsigned<wchar_t>): Remove redundant check for
	__WCHAR_TYPE__ being defined.
	* include/tr1/type_traits [!_GLIBCXX_USE_WCHAR_T]
	(__is_integral_helper<wchar_t>): Likewise.
This commit is contained in:
Jonathan Wakely 2021-10-08 14:52:07 +01:00
parent 4997c8b30e
commit 4bdb9d618d
3 changed files with 1 additions and 11 deletions
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2
libstdc++-v3/include/c_global/cstddef
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@ -73,9 +73,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
template<> struct __byte_operand<char> { using __type = byte; };
template<> struct __byte_operand<signed char> { using __type = byte; };
template<> struct __byte_operand<unsigned char> { using __type = byte; };
#ifdef _GLIBCXX_USE_WCHAR_T
template<> struct __byte_operand<wchar_t> { using __type = byte; };
#endif
#ifdef _GLIBCXX_USE_CHAR8_T
template<> struct __byte_operand<char8_t> { using __type = byte; };
#endif

8
libstdc++-v3/include/std/type_traits
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@ -309,12 +309,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// We want is_integral<wchar_t> to be true (and make_signed/unsigned to work)
// even when libc doesn't provide working <wchar.h> and related functions,
// so check __WCHAR_TYPE__ instead of _GLIBCXX_USE_WCHAR_T.
#ifdef __WCHAR_TYPE__
// so don't check _GLIBCXX_USE_WCHAR_T here.
template<>
struct __is_integral_helper<wchar_t>
: public true_type { };
#endif
#ifdef _GLIBCXX_USE_CHAR8_T
template<>
@ -1828,14 +1826,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// neither signed integer types nor unsigned integer types, so must be
// transformed to the unsigned integer type with the smallest rank.
// Use the partial specialization for enumeration types to do that.
#ifdef __WCHAR_TYPE__
template<>
struct __make_unsigned<wchar_t>
{
using __type
= typename __make_unsigned_selector<wchar_t, false, true>::__type;
};
#endif
#ifdef _GLIBCXX_USE_CHAR8_T
template<>
@ -1960,14 +1956,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
// signed integer types nor unsigned integer types, so must be
// transformed to the signed integer type with the smallest rank.
// Use the partial specialization for enumeration types to do that.
#if defined(__WCHAR_TYPE__)
template<>
struct __make_signed<wchar_t>
{
using __type
= typename __make_signed_selector<wchar_t, false, true>::__type;
};
#endif
#if defined(_GLIBCXX_USE_CHAR8_T)
template<>

2
libstdc++-v3/include/tr1/type_traits
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@ -109,9 +109,7 @@ namespace tr1
_DEFINE_SPEC(0, __is_integral_helper, char, true)
_DEFINE_SPEC(0, __is_integral_helper, signed char, true)
_DEFINE_SPEC(0, __is_integral_helper, unsigned char, true)
#ifdef _GLIBCXX_USE_WCHAR_T
_DEFINE_SPEC(0, __is_integral_helper, wchar_t, true)
#endif
_DEFINE_SPEC(0, __is_integral_helper, short, true)
_DEFINE_SPEC(0, __is_integral_helper, unsigned short, true)
_DEFINE_SPEC(0, __is_integral_helper, int, true)