[libc++] Remove obsolete Solaris and Newlib support for locales

[ldionne]

The solaris header file doesn't even exist, so that's definitely dead code. The newlib header is empty, which means that localization can't work on that platform. If someone is using libc++ with Newlib, they must be providing LIBCXX_HAS_NO_LOCALIZATION today for anything to work, so that header is basically dead code as well.

[llvmbot]

@llvm/pr-subscribers-libcxx

Author: Louis Dionne (ldionne)

Changes

The solaris header file doesn't even exist, so that's definitely dead code. The newlib header is empty, which means that localization can't work on that platform. If someone is using libc++ with Newlib, they must be providing LIBCXX_HAS_NO_LOCALIZATION today for anything to work, so that header is basically dead code as well.

---

Full diff: https://github.com/llvm/llvm-project/pull/113721.diff

4 Files Affected:

• (modified) libcxx/include/CMakeLists.txt (-1)
• (modified) libcxx/include/__locale_dir/locale_base_api.h (-4)
• (removed) libcxx/include/__locale_dir/locale_base_api/newlib.h (-12)
• (modified) libcxx/include/module.modulemap (-1)

diff --git a/libcxx/include/CMakeLists.txt b/libcxx/include/CMakeLists.txt
index 63aa74e09bb1a2..506ed721d0843e 100644
--- a/libcxx/include/CMakeLists.txt
+++ b/libcxx/include/CMakeLists.txt
@@ -497,7 +497,6 @@ set(files
   __locale_dir/locale_base_api/fuchsia.h
   __locale_dir/locale_base_api/ibm.h
   __locale_dir/locale_base_api/musl.h
-  __locale_dir/locale_base_api/newlib.h
   __locale_dir/locale_base_api/openbsd.h
   __locale_dir/locale_base_api/win32.h
   __locale_dir/locale_guard.h
diff --git a/libcxx/include/__locale_dir/locale_base_api.h b/libcxx/include/__locale_dir/locale_base_api.h
index 8c000c558c5279..eab7fa8bf62fae 100644
--- a/libcxx/include/__locale_dir/locale_base_api.h
+++ b/libcxx/include/__locale_dir/locale_base_api.h
@@ -15,10 +15,6 @@
 #  include <__locale_dir/locale_base_api/ibm.h>
 #elif defined(__ANDROID__)
 #  include <__locale_dir/locale_base_api/android.h>
-#elif defined(__sun__)
-#  include <__locale_dir/locale_base_api/solaris.h>
-#elif defined(_NEWLIB_VERSION)
-#  include <__locale_dir/locale_base_api/newlib.h>
 #elif defined(__OpenBSD__)
 #  include <__locale_dir/locale_base_api/openbsd.h>
 #elif defined(__Fuchsia__)
diff --git a/libcxx/include/__locale_dir/locale_base_api/newlib.h b/libcxx/include/__locale_dir/locale_base_api/newlib.h
deleted file mode 100644
index 7da10e5889843d..00000000000000
--- a/libcxx/include/__locale_dir/locale_base_api/newlib.h
+++ /dev/null
@@ -1,12 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef _LIBCPP___LOCALE_DIR_LOCALE_BASE_API_NEWLIB_H
-#define _LIBCPP___LOCALE_DIR_LOCALE_BASE_API_NEWLIB_H
-
-#endif // _LIBCPP___LOCALE_DIR_LOCALE_BASE_API_NEWLIB_H
diff --git a/libcxx/include/module.modulemap b/libcxx/include/module.modulemap
index c79070c318759d..f92e8bf5fc9aba 100644
--- a/libcxx/include/module.modulemap
+++ b/libcxx/include/module.modulemap
@@ -1451,7 +1451,6 @@ module std [system] {
       textual header "__locale_dir/locale_base_api/fuchsia.h"
       textual header "__locale_dir/locale_base_api/ibm.h"
       textual header "__locale_dir/locale_base_api/musl.h"
-      textual header "__locale_dir/locale_base_api/newlib.h"
       textual header "__locale_dir/locale_base_api/openbsd.h"
       textual header "__locale_dir/locale_base_api/win32.h"
     }