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libstdc++: Guard uses of char8_t with __cpp_char8_t [PR114519]

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libstdc++-v3/ChangeLog:

	PR libstdc++/114519
	* include/bits/unicode.h (_Utf8_view): Guard with check for
	char8_t being enabled.
	(__literal_encoding_is_unicode): Guard use of char8_t with check
	for it being enabled.
	* testsuite/std/format/functions/114519.cc: New test.
This commit is contained in:
Jonathan Wakely 2024-03-28 21:29:17 +00:00
parent ca2f7c8492
commit 21aa57e73b
2 changed files with 10 additions and 3 deletions
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10
libstdc++-v3/include/bits/unicode.h
View File

@ -578,8 +578,10 @@ namespace __unicode
constexpr bool empty() const { return ranges::empty(_M_base); }
};
#ifdef __cpp_char8_t
template<typename _View>
using _Utf8_view = _Utf_view<char8_t, _View>;
#endif
template<typename _View>
using _Utf16_view = _Utf_view<char16_t, _View>;
template<typename _View>
@ -991,12 +993,14 @@ inline namespace __v15_1_0
consteval bool
__literal_encoding_is_unicode()
{
if constexpr (is_same_v<_CharT, char8_t>)
return true;
else if constexpr (is_same_v<_CharT, char16_t>)
if constexpr (is_same_v<_CharT, char16_t>)
return true;
else if constexpr (is_same_v<_CharT, char32_t>)
return true;
#ifdef __cpp_char8_t
else if constexpr (is_same_v<_CharT, char8_t>)
return true;
#endif
const char* __enc = "";

3
libstdc++-v3/testsuite/std/format/functions/114519.cc Normal file
View File

@ -0,0 +1,3 @@
// { dg-do compile { target c++20 } }
// { dg-options "-fno-char8_t" }
#include <format>