[libcxx][AIX] Remove locale fallbacks for old OS levels

[daltenty]

Summary

These routines were add years ago during initial porting attempts to AIX and are mostly build hacks for routines which we're missing at the time, but are available now on recent AIX OS levels.

Thus builds on modern AIX OS levels no longer need these and they cause problems if you try to build the library with a generic triple (i.e. powerpc-ibm-aix) as we'll pull them in and encounter duplicate definitions from the OS.

[ldionne]

Ship it. You can ignore the CI failure, it's been fixed on main now.

libcxx/include/CMakeLists.txt

set(files
   __ranges/view_interface.h
   __split_buffer
   __std_stream
   __string
   __support/android/locale_bionic.h
   __support/fuchsia/xlocale.h
   __support/ibm/gettod_zos.h
   __support/ibm/limits.h
-  __support/ibm/locale_mgmt_aix.h
   __support/ibm/locale_mgmt_zos.h
   __support/ibm/nanosleep.h
   __support/ibm/support.h
   __support/ibm/xlocale.h
   __support/musl/xlocale.h
   __support/newlib/xlocale.h
   __support/openbsd/xlocale.h
   __support/solaris/floatingpoint.h

libcxx/include/__support/ibm/locale_mgmt_aix.h

-// -*- C++ -*-
-//===-----------------------------------------------------------------------===//
-//
-// 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_SUPPORT_IBM_LOCALE_MGMT_AIX_H
-#define _LIBCPP_SUPPORT_IBM_LOCALE_MGMT_AIX_H
-
-#if defined(_AIX)
-#include "cstdlib"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#if !defined(_AIX71)
-// AIX 7.1 and higher has these definitions.  Definitions and stubs
-// are provied here as a temporary workaround on AIX 6.1.
-
-#define LC_COLLATE_MASK         1
-#define LC_CTYPE_MASK           2
-#define LC_MESSAGES_MASK        4
-#define LC_MONETARY_MASK        8
-#define LC_NUMERIC_MASK         16
-#define LC_TIME_MASK            32
-#define LC_ALL_MASK             (LC_COLLATE_MASK | LC_CTYPE_MASK | \
-                                 LC_MESSAGES_MASK | LC_MONETARY_MASK |\
-                                 LC_NUMERIC_MASK | LC_TIME_MASK)
-
-typedef void* locale_t;
-
-// The following are stubs.  They are not supported on AIX 6.1.
-static inline
-locale_t newlocale(int category_mask, const char *locale, locale_t base)
-{
-  _LC_locale_t *newloc, *loc;
-  if ((loc = (_LC_locale_t *)__xopen_locale(locale)) == NULL)
-  {
-    errno = EINVAL;
-    return (locale_t)0;
-  }
-  if ((newloc = (_LC_locale_t *)calloc(1, sizeof(_LC_locale_t))) == NULL)
-  {
-    errno = ENOMEM;
-    return (locale_t)0;
-  }
-  if (!base)
-    base = (_LC_locale_t *)__xopen_locale("C");
-  memcpy(newloc, base, sizeof (_LC_locale_t));
-  if (category_mask & LC_COLLATE_MASK)
-    newloc->lc_collate = loc->lc_collate;
-  if (category_mask & LC_CTYPE_MASK)
-    newloc->lc_ctype = loc->lc_ctype;
-  //if (category_mask & LC_MESSAGES_MASK)
-  //  newloc->lc_messages = loc->lc_messages;
-  if (category_mask & LC_MONETARY_MASK)
-    newloc->lc_monetary = loc->lc_monetary;
-  if (category_mask & LC_TIME_MASK)
-    newloc->lc_time = loc->lc_time;
-  if (category_mask & LC_NUMERIC_MASK)
-    newloc->lc_numeric = loc->lc_numeric;
-  return (locale_t)newloc;
-}
-static inline
-void freelocale(locale_t locobj)
-{
-  free(locobj);
-}
-static inline
-locale_t uselocale(locale_t newloc)
-{
-  return (locale_t)0;
-}
-#endif // !defined(_AIX71)
-
-#ifdef __cplusplus
-}
-#endif
-#endif // defined(_AIX)
-#endif // _LIBCPP_SUPPORT_IBM_LOCALE_MGMT_AIX_H

libcxx/include/__support/ibm/xlocale.h

 // -*- C++ -*-
 //===-----------------------------------------------------------------------===//
 //
 // 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_SUPPORT_IBM_XLOCALE_H
 #define _LIBCPP_SUPPORT_IBM_XLOCALE_H
 
-#include <__support/ibm/locale_mgmt_aix.h>
 #include <__support/ibm/locale_mgmt_zos.h>
 #include <stdarg.h>
 
 #include "cstdlib"
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-#if defined(_AIX)
-#if !defined(_AIX71)
-// AIX 7.1 and higher has these definitions.  Definitions and stubs
-// are provied here as a temporary workaround on AIX 6.1.
-static inline
-int isalnum_l(int c, locale_t locale)
-{
-  return __xisalnum(locale, c);
-}
-static inline
-int isalpha_l(int c, locale_t locale)
-{
-  return __xisalpha(locale, c);
-}
-static inline
-int isblank_l(int c, locale_t locale)
-{
-  return __xisblank(locale, c);
-}
-static inline
-int iscntrl_l(int c, locale_t locale)
-{
-  return __xiscntrl(locale, c);
-}
-static inline
-int isdigit_l(int c, locale_t locale)
-{
-  return __xisdigit(locale, c);
-}
-static inline
-int isgraph_l(int c, locale_t locale)
-{
-  return __xisgraph(locale, c);
-}
-static inline
-int islower_l(int c, locale_t locale)
-{
-  return __xislower(locale, c);
-}
-static inline
-int isprint_l(int c, locale_t locale)
-{
-  return __xisprint(locale, c);
-}
-
-static inline
-int ispunct_l(int c, locale_t locale)
-{
-  return __xispunct(locale, c);
-}
-static inline
-int isspace_l(int c, locale_t locale)
-{
-  return __xisspace(locale, c);
-}
-static inline
-int isupper_l(int c, locale_t locale)
-{
-  return __xisupper(locale, c);
-}
-
-static inline
-int isxdigit_l(int c, locale_t locale)
-{
-  return __xisxdigit(locale, c);
-}
-
-static inline
-int iswalnum_l(wchar_t wc, locale_t locale)
-{
-  return __xiswalnum(locale, wc);
-}
-
-static inline
-int iswalpha_l(wchar_t wc, locale_t locale)
-{
-  return __xiswalpha(locale, wc);
-}
-
-static inline
-int iswblank_l(wchar_t wc, locale_t locale)
-{
-  return __xiswblank(locale, wc);
-}
-
-static inline
-int iswcntrl_l(wchar_t wc, locale_t locale)
-{
-  return __xiswcntrl(locale, wc);
-}
-
-static inline
-int iswdigit_l(wchar_t wc, locale_t locale)
-{
-  return __xiswdigit(locale, wc);
-}
-
-static inline
-int iswgraph_l(wchar_t wc, locale_t locale)
-{
-  return __xiswgraph(locale, wc);
-}
-
-static inline
-int iswlower_l(wchar_t wc, locale_t locale)
-{
-  return __xiswlower(locale, wc);
-}
-
-static inline
-int iswprint_l(wchar_t wc, locale_t locale)
-{
-  return __xiswprint(locale, wc);
-}
-
-static inline
-int iswpunct_l(wchar_t wc, locale_t locale)
-{
-  return __xiswpunct(locale, wc);
-}
-
-static inline
-int iswspace_l(wchar_t wc, locale_t locale)
-{
-  return __xiswspace(locale, wc);
-}
-
-static inline
-int iswupper_l(wchar_t wc, locale_t locale)
-{
-  return __xiswupper(locale, wc);
-}
-
-static inline
-int iswxdigit_l(wchar_t wc, locale_t locale)
-{
-  return __xiswxdigit(locale, wc);
-}
-
-static inline
-int iswctype_l(wint_t wc, wctype_t desc, locale_t locale)
-{
-  return __xiswctype(locale, wc, desc);
-}
-
-static inline
-int toupper_l(int c, locale_t locale)
-{
-  return __xtoupper(locale, c);
-}
-static inline
-int tolower_l(int c, locale_t locale)
-{
-  return __xtolower(locale, c);
-}
-static inline
-wint_t towupper_l(wint_t wc, locale_t locale)
-{
-  return __xtowupper(locale, wc);
-}
-static inline
-wint_t towlower_l(wint_t wc, locale_t locale)
-{
-  return __xtowlower(locale, wc);
-}
-
-static inline
-int strcoll_l(const char *__s1, const char *__s2, locale_t locale)
-{
-  return __xstrcoll(locale, __s1, __s2);
-}
-static inline
-int wcscoll_l(const wchar_t *__s1, const wchar_t *__s2, locale_t locale)
-{
-  return __xwcscoll(locale, __s1, __s2);
-}
-static inline
-size_t strxfrm_l(char *__s1, const char *__s2, size_t __n, locale_t locale)
-{
-  return __xstrxfrm(locale, __s1, __s2, __n);
-}
-
-static inline
-size_t wcsxfrm_l(wchar_t *__ws1, const wchar_t *__ws2, size_t __n,
-    locale_t locale)
-{
-  return __xwcsxfrm(locale, __ws1, __ws2, __n);
-}
-#endif // !defined(_AIX71)
-
-// strftime_l() is defined by POSIX. However, AIX 7.1 and z/OS do not have it
-// implemented yet. z/OS retrieves it from the POSIX fallbacks.
-#if !defined(_AIX72)
-static inline
-size_t strftime_l(char *__s, size_t __size, const char *__fmt,
-                  const struct tm *__tm, locale_t locale) {
-  return __xstrftime(locale, __s, __size, __fmt, __tm);
-}
-#endif
-
-#elif defined(__MVS__)
+#if defined(__MVS__)
 #include <wctype.h>
 // POSIX routines
 #include <__support/xlocale/__posix_l_fallback.h>
 #endif // defined(__MVS__)
 
 namespace {
 
 struct __setAndRestore {