From 3ad39e9878310e5317ee73c9b353c1e2c1c5c4ee Mon Sep 17 00:00:00 2001
From: Richard Qin <richard.qin.x@gmail.com>
Date: Sat, 11 Jul 2026 22:48:30 +0800
Subject: lib: establish Zircon libc++ and KTL foundation

---
 third_party/libcxx/include/c++/v1/cerrno | 52 ++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 third_party/libcxx/include/c++/v1/cerrno

(limited to 'third_party/libcxx/include/c++/v1/cerrno')

diff --git a/third_party/libcxx/include/c++/v1/cerrno b/third_party/libcxx/include/c++/v1/cerrno
new file mode 100644
index 0000000..15925d4
--- /dev/null
+++ b/third_party/libcxx/include/c++/v1/cerrno
@@ -0,0 +1,52 @@
+// -*- 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_CERRNO
+#define _LIBCPP_CERRNO
+
+/*
+    cerrno synopsis
+
+Macros:
+
+    EDOM
+    EILSEQ  // C99
+    ERANGE
+    errno
+
+*/
+
+#if __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
+#  include <__cxx03/cerrno>
+#else
+#  include <__config>
+
+#  include <errno.h>
+
+#  ifndef _LIBCPP_ERRNO_H
+#   error <cerrno> tried including <errno.h> but didn't find libc++'s <errno.h> header. \
+          This usually means that your header search paths are not configured properly. \
+          The header search paths should contain the C++ Standard Library headers before \
+          any C Standard Library, and you are probably using compiler flags that make that \
+          not be the case.
+#  endif
+
+#  if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#    pragma GCC system_header
+#  endif
+
+// LWG3869 Deprecate std::errc constants related to UNIX STREAMS
+//
+// This LWG issue deprecates the POSIX macros ENODATA, ENOSR, ENOSTR, and ETIME. These were
+// deprecated in libc++ in https://github.com/llvm/llvm-project/pull/80542.
+// Based on the post commit feedback the macro are no longer deprecated.
+// Instead libc++ leaves the deprecation to the provider of errno.h.
+#endif // __cplusplus < 201103L && defined(_LIBCPP_USE_FROZEN_CXX03_HEADERS)
+
+#endif // _LIBCPP_CERRNO
-- 
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