From 4a68654ad6c4d85208b817fc914e17d084ed25ae Mon Sep 17 00:00:00 2001
From: Petr Hosek <phosek@google.com>
Date: Sat, 13 Jul 2024 11:23:32 -0700
Subject: [PATCH] [libc] Remove src/errno/errno.h (#98759)

This addresses the build error introduced in #98287 where
src/errno/errno.h is included instead of the system errno.h.

We instead move the declaration to libc_errno.h.
---
 libc/src/errno/CMakeLists.txt |  1 -
 libc/src/errno/errno.h        | 14 --------------
 libc/src/errno/libc_errno.cpp | 15 +++++----------
 libc/src/errno/libc_errno.h   |  2 ++
 4 files changed, 7 insertions(+), 25 deletions(-)
 delete mode 100644 libc/src/errno/errno.h

diff --git a/libc/src/errno/CMakeLists.txt b/libc/src/errno/CMakeLists.txt
index b05fd4e31ff68..1d78a5eedff96 100644
--- a/libc/src/errno/CMakeLists.txt
+++ b/libc/src/errno/CMakeLists.txt
@@ -18,7 +18,6 @@ add_entrypoint_object(
   SRCS
     libc_errno.cpp
   HDRS
-    errno.h
     libc_errno.h     # Include this
   COMPILE_OPTIONS
     ${full_build_flag}
diff --git a/libc/src/errno/errno.h b/libc/src/errno/errno.h
deleted file mode 100644
index a2df93513ec62..0000000000000
--- a/libc/src/errno/errno.h
+++ /dev/null
@@ -1,14 +0,0 @@
-//===-- Implementation header for errno -------------------------*- 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 LLVM_LIBC_SRC_ERRNO_ERRNO_H
-#define LLVM_LIBC_SRC_ERRNO_ERRNO_H
-
-extern "C" int *__llvm_libc_errno();
-
-#endif // LLVM_LIBC_SRC_ERRNO_ERRNO_H
diff --git a/libc/src/errno/libc_errno.cpp b/libc/src/errno/libc_errno.cpp
index f7bd3a3b9eb4b..7b28a62c786b0 100644
--- a/libc/src/errno/libc_errno.cpp
+++ b/libc/src/errno/libc_errno.cpp
@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 #include "libc_errno.h"
-#include "src/errno/errno.h"
 #include "src/__support/macros/config.h"
 
 // libc never stores a value; `errno` macro uses get link-time failure.
@@ -47,9 +46,6 @@ LIBC_ERRNO_MODE_SYSTEM
 
 namespace LIBC_NAMESPACE_DECL {
 
-// Define the global `libc_errno` instance.
-Errno libc_errno;
-
 #if LIBC_ERRNO_MODE == LIBC_ERRNO_MODE_UNDEFINED
 
 void Errno::operator=(int) {}
@@ -61,9 +57,7 @@ namespace {
 LIBC_THREAD_LOCAL int thread_errno;
 }
 
-extern "C" {
-int *__llvm_libc_errno() { return &thread_errno; }
-}
+extern "C" int *__llvm_libc_errno() { return &thread_errno; }
 
 void Errno::operator=(int a) { thread_errno = a; }
 Errno::operator int() { return thread_errno; }
@@ -74,9 +68,7 @@ namespace {
 int shared_errno;
 }
 
-extern "C" {
-int *__llvm_libc_errno() { return &shared_errno; }
-}
+extern "C" int *__llvm_libc_errno() { return &shared_errno; }
 
 void Errno::operator=(int a) { shared_errno = a; }
 Errno::operator int() { return shared_errno; }
@@ -93,4 +85,7 @@ Errno::operator int() { return errno; }
 
 #endif
 
+// Define the global `libc_errno` instance.
+Errno libc_errno;
+
 } // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/errno/libc_errno.h b/libc/src/errno/libc_errno.h
index c6c6b20b48251..82c65f5a0b7f6 100644
--- a/libc/src/errno/libc_errno.h
+++ b/libc/src/errno/libc_errno.h
@@ -33,6 +33,8 @@
 
 namespace LIBC_NAMESPACE_DECL {
 
+extern "C" int *__llvm_libc_errno();
+
 struct Errno {
   void operator=(int);
   operator int();