[libcxx-commits] [libcxx] ea05555 - [libc++] Add implementations of `__get_locale_encoding(...)` to Fuschia and LLVM-Libc (#205716)

[via libcxx-commits]

Author: William Tran-Viet
Date: 2026-06-25T15:31:23+08:00
New Revision: ea05555c54ab5d15628e2676cd17ca084a81901a

URL: https://github.com/llvm/llvm-project/commit/ea05555c54ab5d15628e2676cd17ca084a81901a
DIFF: https://github.com/llvm/llvm-project/commit/ea05555c54ab5d15628e2676cd17ca084a81901a.diff

LOG: [libc++] Add implementations of `__get_locale_encoding(...)` to Fuschia and LLVM-Libc (#205716)

- These were missed in #141312 and consequently broke the Fuschia and
AMDGPU llvm-libc build bots.
- Fuschia seems to have support for `nl_langinfo_l(...)`, so we can use
that.
- However, LLVM-libc does not implement it, so for now we can do a dummy
implementation and mark `environment()` and `encoding()` as unsupported
on LLVM libc.

Added: 
    

Modified: 
    libcxx/include/__locale_dir/support/fuchsia.h
    libcxx/include/__locale_dir/support/llvm_libc.h
    libcxx/test/libcxx/text/text_encoding/environment.pass.cpp
    libcxx/test/std/text/text_encoding/text_encoding.members/environment.pass.cpp

Removed: 
    


################################################################################
diff  --git a/libcxx/include/__locale_dir/support/fuchsia.h b/libcxx/include/__locale_dir/support/fuchsia.h
index 528bfeb0cb6e1..1fe292a908a9c 100644
--- a/libcxx/include/__locale_dir/support/fuchsia.h
+++ b/libcxx/include/__locale_dir/support/fuchsia.h
@@ -15,6 +15,7 @@
 #include <cstdio>
 #include <cstdlib>
 #include <cwchar>
+#include <langinfo.h>
 
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #  pragma GCC system_header
@@ -69,6 +70,10 @@ inline _LIBCPP_HIDE_FROM_ABI __lconv_t* __localeconv(__locale_t& __loc) {
   return std::localeconv();
 }
 
+inline _LIBCPP_HIDE_FROM_ABI const char* __get_locale_encoding(__locale_t __loc) {
+  return ::nl_langinfo_l(CODESET, __loc);
+}
+
 //
 // Other functions
 //

diff  --git a/libcxx/include/__locale_dir/support/llvm_libc.h b/libcxx/include/__locale_dir/support/llvm_libc.h
index 1ce1c443d87ed..c494f07f4f1f4 100644
--- a/libcxx/include/__locale_dir/support/llvm_libc.h
+++ b/libcxx/include/__locale_dir/support/llvm_libc.h
@@ -47,6 +47,8 @@ inline _LIBCPP_HIDE_FROM_ABI char* __setlocale(int __category, char const* __loc
 }
 
 inline _LIBCPP_HIDE_FROM_ABI __lconv_t* __localeconv(__locale_t&) { return std::localeconv(); }
+
+inline _LIBCPP_HIDE_FROM_ABI const char* __get_locale_encoding(__locale_t) { return nullptr; }
 #endif // _LIBCPP_BUILDING_LIBRARY
 
 } // namespace __locale

diff  --git a/libcxx/test/libcxx/text/text_encoding/environment.pass.cpp b/libcxx/test/libcxx/text/text_encoding/environment.pass.cpp
index b5c88c6e6d568..0bcabb235fc8b 100644
--- a/libcxx/test/libcxx/text/text_encoding/environment.pass.cpp
+++ b/libcxx/test/libcxx/text/text_encoding/environment.pass.cpp
@@ -14,6 +14,7 @@
 // UNSUPPORTED: no-localization
 // UNSUPPORTED: windows, android
 // UNSUPPORTED: availability-te-environment-missing
+// UNSUPPORTED: LLVM-LIBC-FIXME
 
 // std::text_encoding::environment()
 

diff  --git a/libcxx/test/std/text/text_encoding/text_encoding.members/environment.pass.cpp b/libcxx/test/std/text/text_encoding/text_encoding.members/environment.pass.cpp
index 113b151765c81..8907f72b55140 100644
--- a/libcxx/test/std/text/text_encoding/text_encoding.members/environment.pass.cpp
+++ b/libcxx/test/std/text/text_encoding/text_encoding.members/environment.pass.cpp
@@ -11,6 +11,7 @@
 
 // UNSUPPORTED: no-localization
 // UNSUPPORTED: availability-te-environment-missing
+// UNSUPPORTED: LLVM-LIBC-FIXME
 
 // <text_encoding>