[libc++] Guard <codecvt> contents on _LIBCPP_HAS_LOCALIZATION #129112
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The codecvt class is defined in <locale> and the contents of the <codecvt> header don't work when localization is disabled. Without this guard, builds with localization disabled that happen to include <codecvt> could be broken because they would try to include <__locale>, which ends up trying to include the locale base API and eventually platform headers like <xlocale.h> that may not exist.
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@llvm/pr-subscribers-libcxx Author: Louis Dionne (ldionne) ChangesThe codecvt class is defined in <locale> and the contents of the <codecvt> header don't work when localization is disabled. Without this guard, builds with localization disabled that happen to include <codecvt> could be broken because they would try to include <__locale>, which ends up trying to include the locale base API and eventually platform headers like <xlocale.h> that may not exist. Full diff: https://github.com/llvm/llvm-project/pull/129112.diff 1 Files Affected:
diff --git a/libcxx/include/codecvt b/libcxx/include/codecvt
index f7ae804c6789c..0526b8512175f 100644
--- a/libcxx/include/codecvt
+++ b/libcxx/include/codecvt
@@ -58,14 +58,17 @@ class codecvt_utf8_utf16
# include <__cxx03/codecvt>
#else
# include <__config>
-# include <__locale>
-# include <version>
-# if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
-# pragma GCC system_header
-# endif
+# if _LIBCPP_HAS_LOCALIZATION
+
+# include <__locale>
+# include <version>
-# if _LIBCPP_STD_VER < 26 || defined(_LIBCPP_BUILDING_LIBRARY) || defined(_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT)
+# if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+# pragma GCC system_header
+# endif
+
+# if _LIBCPP_STD_VER < 26 || defined(_LIBCPP_BUILDING_LIBRARY) || defined(_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT)
_LIBCPP_BEGIN_NAMESPACE_STD
@@ -76,7 +79,7 @@ enum _LIBCPP_DEPRECATED_IN_CXX17 codecvt_mode { consume_header = 4, generate_hea
template <class _Elem>
class __codecvt_utf8;
-# if _LIBCPP_HAS_WIDE_CHARACTERS
+# if _LIBCPP_HAS_WIDE_CHARACTERS
template <>
class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf8<wchar_t> : public codecvt<wchar_t, char, mbstate_t> {
unsigned long __maxcode_;
@@ -115,7 +118,7 @@ protected:
int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
int do_max_length() const _NOEXCEPT override;
};
-# endif // _LIBCPP_HAS_WIDE_CHARACTERS
+# endif // _LIBCPP_HAS_WIDE_CHARACTERS
_LIBCPP_SUPPRESS_DEPRECATED_PUSH
template <>
@@ -206,7 +209,7 @@ _LIBCPP_SUPPRESS_DEPRECATED_POP
template <class _Elem, bool _LittleEndian>
class __codecvt_utf16;
-# if _LIBCPP_HAS_WIDE_CHARACTERS
+# if _LIBCPP_HAS_WIDE_CHARACTERS
template <>
class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf16<wchar_t, false> : public codecvt<wchar_t, char, mbstate_t> {
unsigned long __maxcode_;
@@ -284,7 +287,7 @@ protected:
int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
int do_max_length() const _NOEXCEPT override;
};
-# endif // _LIBCPP_HAS_WIDE_CHARACTERS
+# endif // _LIBCPP_HAS_WIDE_CHARACTERS
_LIBCPP_SUPPRESS_DEPRECATED_PUSH
template <>
@@ -451,7 +454,7 @@ _LIBCPP_SUPPRESS_DEPRECATED_POP
template <class _Elem>
class __codecvt_utf8_utf16;
-# if _LIBCPP_HAS_WIDE_CHARACTERS
+# if _LIBCPP_HAS_WIDE_CHARACTERS
template <>
class _LIBCPP_EXPORTED_FROM_ABI __codecvt_utf8_utf16<wchar_t> : public codecvt<wchar_t, char, mbstate_t> {
unsigned long __maxcode_;
@@ -490,7 +493,7 @@ protected:
int do_length(state_type&, const extern_type* __frm, const extern_type* __end, size_t __mx) const override;
int do_max_length() const _NOEXCEPT override;
};
-# endif // _LIBCPP_HAS_WIDE_CHARACTERS
+# endif // _LIBCPP_HAS_WIDE_CHARACTERS
_LIBCPP_SUPPRESS_DEPRECATED_PUSH
template <>
@@ -579,7 +582,9 @@ _LIBCPP_SUPPRESS_DEPRECATED_POP
_LIBCPP_END_NAMESPACE_STD
-# endif // _LIBCPP_STD_VER < 26 || defined(_LIBCPP_BUILDING_LIBRARY) || defined(_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT)
+# endif // _LIBCPP_STD_VER < 26 || defined(_LIBCPP_BUILDING_LIBRARY) || defined(_LIBCPP_ENABLE_CXX26_REMOVED_CODECVT)
+
+# endif // _LIBCPP_HAS_LOCALIZATION
# if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
# include <atomic>
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var-const
approved these changes
Feb 27, 2025
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The codecvt class is defined in and the contents of the header don't work when localization is disabled. Without this guard, builds with localization disabled that happen to include could be broken because they would try to include <__locale>, which ends up trying to include the locale base API and eventually platform headers like <xlocale.h> that may not exist.