[libcxx] Port to OpenBSD

[brad]

Summary

A patch to add initial OpenBSD support.

[brad]

Anyone?

[ldionne]

Sorry, I think I had started the review on my phone and forgot to pick it back up. LGTM, do you need commit access?

On a side note, everybody porting to a new platform needs to add this xlocale.h header. I think it points to something we could improve on.

libcxx/include/__config

373

OpenBSD doesn’t have quick exit?

[brad]

In D94205#2493714, @ldionne wrote:

Sorry, I think I had started the review on my phone and forgot to pick it back up. LGTM, do you need commit access?

Thanks. I wasn't sure if you saw this since Phabricator had a warning about something being blocked. I didn't fully understand that part.

I have commit access.

libcxx/include/__config

373

OpenBSD doesn’t have quick exit?

Correct. I am prodding from our end to see about such support being added especially seeing as we're the odd man out.

libcxx/include/CMakeLists.txt

set(files
   support/ibm/limits.h
   support/ibm/locale_mgmt_aix.h
   support/ibm/nanosleep.h
   support/ibm/support.h
   support/ibm/xlocale.h
   support/musl/xlocale.h
   support/newlib/xlocale.h
   support/nuttx/xlocale.h
+  support/openbsd/xlocale.h
   support/solaris/floatingpoint.h
   support/solaris/wchar.h
   support/solaris/xlocale.h
   support/win32/limits_msvc_win32.h
   support/win32/locale_win32.h
   support/xlocale/__nop_locale_mgmt.h
   support/xlocale/__posix_l_fallback.h
   support/xlocale/__strtonum_fallback.h

libcxx/include/__config

 #  else  // _BYTE_ORDER == _LITTLE_ENDIAN
 #    define _LIBCPP_BIG_ENDIAN
 #  endif  // _BYTE_ORDER == _LITTLE_ENDIAN
 #  ifndef __LONG_LONG_SUPPORTED
 #    define _LIBCPP_HAS_NO_LONG_LONG
 #  endif  // __LONG_LONG_SUPPORTED
 #endif  // __FreeBSD__
 
-#ifdef __NetBSD__
+#if defined(__NetBSD__) || defined(__OpenBSD__)
 #  include <sys/endian.h>
 #  if _BYTE_ORDER == _LITTLE_ENDIAN
 #    define _LIBCPP_LITTLE_ENDIAN
 #  else  // _BYTE_ORDER == _LITTLE_ENDIAN
 #    define _LIBCPP_BIG_ENDIAN
 #  endif  // _BYTE_ORDER == _LITTLE_ENDIAN
-#endif  // __NetBSD__
+#endif  // defined(__NetBSD__) || defined(__OpenBSD__)
 
 #if defined(_WIN32)
 #  define _LIBCPP_WIN32API
 #  define _LIBCPP_LITTLE_ENDIAN
 #  define _LIBCPP_SHORT_WCHAR   1
 // Both MinGW and native MSVC provide a "MSVC"-like environment
 #  define _LIBCPP_MSVCRT_LIKE
 // If mingw not explicitly detected, assume using MS C runtime only if

 #  include <sys/isa_defs.h>
 #  ifdef _LITTLE_ENDIAN
 #    define _LIBCPP_LITTLE_ENDIAN
 #  else
 #    define _LIBCPP_BIG_ENDIAN
 #  endif
 #endif // __sun__
 
-#if defined(__CloudABI__)
+#if defined(__OpenBSD__) || defined(__CloudABI__)
    // Certain architectures provide arc4random(). Prefer using
    // arc4random() over /dev/{u,}random to make it possible to obtain
    // random data even when using sandboxing mechanisms such as chroots,
    // Capsicum, etc.
 #  define _LIBCPP_USING_ARC4_RANDOM
 #elif defined(__Fuchsia__) || defined(__wasi__)
 #  define _LIBCPP_USING_GETENTROPY
 #elif defined(__native_client__)

 #    endif
 #    if __ANDROID_API__ >= 29
 #      define _LIBCPP_HAS_TIMESPEC_GET
 #    endif
 #  elif defined(__Fuchsia__) || defined(__wasi__) || defined(__NetBSD__)
 #    define _LIBCPP_HAS_ALIGNED_ALLOC
 #    define _LIBCPP_HAS_QUICK_EXIT
 #    define _LIBCPP_HAS_TIMESPEC_GET
+#  elif defined(__OpenBSD__)
+#    define _LIBCPP_HAS_ALIGNED_ALLOC
+#    define _LIBCPP_HAS_TIMESPEC_GET
 #  elif defined(__linux__)
 #    if !defined(_LIBCPP_HAS_MUSL_LIBC)
 #      if _LIBCPP_GLIBC_PREREQ(2, 15) || defined(__BIONIC__)
 #        define _LIBCPP_HAS_QUICK_EXIT
 #      endif
 #      if _LIBCPP_GLIBC_PREREQ(2, 17)
 #        define _LIBCPP_HAS_ALIGNED_ALLOC
 #        define _LIBCPP_HAS_TIMESPEC_GET

 // Thread API
 #if !defined(_LIBCPP_HAS_NO_THREADS) && \
     !defined(_LIBCPP_HAS_THREAD_API_PTHREAD) && \
     !defined(_LIBCPP_HAS_THREAD_API_WIN32) && \
     !defined(_LIBCPP_HAS_THREAD_API_EXTERNAL)
 #  if defined(__FreeBSD__) || \
       defined(__wasi__) || \
       defined(__NetBSD__) || \
+      defined(__OpenBSD__) || \
       defined(__NuttX__) || \
       defined(__linux__) || \
       defined(__GNU__) || \
       defined(__APPLE__) || \
       defined(__CloudABI__) || \
       defined(__sun__) || \
       defined(__MVS__) || \
       (defined(__MINGW32__) && __has_include(<pthread.h>))

 #ifdef __CloudABI__
 #define _LIBCPP_HAS_NO_STDIN
 #define _LIBCPP_HAS_NO_STDOUT
 #endif
 
 // Some systems do not provide gets() in their C library, for security reasons.
 #ifndef _LIBCPP_C_HAS_NO_GETS
 #  if defined(_LIBCPP_MSVCRT) || \
-      (defined(__FreeBSD_version) && __FreeBSD_version >= 1300043)
+      (defined(__FreeBSD_version) && __FreeBSD_version >= 1300043) || \
+      defined(__OpenBSD__)
 #    define _LIBCPP_C_HAS_NO_GETS
 #  endif
 #endif
 
 #if defined(__BIONIC__) || defined(__CloudABI__) || defined(__NuttX__) ||      \
     defined(__Fuchsia__) || defined(__wasi__) || defined(_LIBCPP_HAS_MUSL_LIBC) || \
-    defined(__MVS__)
+    defined(__MVS__) || defined(__OpenBSD__)
 #define _LIBCPP_PROVIDES_DEFAULT_RUNE_TABLE
 #endif
 
 // Thread-unsafe functions such as strtok() and localtime()
 // are not available.
 #ifdef __CloudABI__
 #define _LIBCPP_HAS_NO_THREAD_UNSAFE_C_FUNCTIONS
 #endif

libcxx/include/__locale

 # include <support/ibm/xlocale.h>
 #elif defined(__ANDROID__)
 # include <support/android/locale_bionic.h>
 #elif defined(__sun__)
 # include <xlocale.h>
 # include <support/solaris/xlocale.h>
 #elif defined(_NEWLIB_VERSION)
 # include <support/newlib/xlocale.h>
+#elif defined(__OpenBSD__)
+# include <support/openbsd/xlocale.h>
 #elif (defined(__APPLE__)      || defined(__FreeBSD__) \
     || defined(__EMSCRIPTEN__) || defined(__IBMCPP__))
 # include <xlocale.h>
 #elif defined(__Fuchsia__)
 # include <support/fuchsia/xlocale.h>
 #elif defined(__wasi__)
 // WASI libc uses musl's locales support.
 # include <support/musl/xlocale.h>

libcxx/include/support/openbsd/xlocale.h

+// -*- C++ -*-
+//===-------------------- support/openbsd/xlocale.h -----------------------===//
+//
+// 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_OPENBSD_XLOCALE_H
+#define _LIBCPP_SUPPORT_OPENBSD_XLOCALE_H
+
+#include <cstdlib>
+#include <clocale>
+#include <cwctype>
+#include <ctype.h>
+#include <support/xlocale/__strtonum_fallback.h>
+
+#endif