[libc-commits] [libc] [libc] Add the `<endian.h>` header. (PR #125168)
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Thu Jan 30 21:36:13 PST 2025
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-libc
Author: None (c8ef)
<details>
<summary>Changes</summary>
Closes [#<!-- -->124631](https://github.com/llvm/llvm-project/issues/124631).
ref: https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/endian.h.html
This patch adds the implementation of `endian.h`, which includes the header itself and three related macros. These macros in the header rely on the compiler preprocessor, similar to how https://github.com/llvm/llvm-project/blob/main/libc/src/__support/endian_internal.h does. Hopefully this will meet the requirements for compiling llvm with llvm-libc.
---
Full diff: https://github.com/llvm/llvm-project/pull/125168.diff
7 Files Affected:
- (modified) libc/config/linux/aarch64/headers.txt (+1)
- (modified) libc/config/linux/x86_64/headers.txt (+1)
- (modified) libc/include/CMakeLists.txt (+9)
- (added) libc/include/endian.h.def (+17)
- (added) libc/include/endian.yaml (+9)
- (modified) libc/include/llvm-libc-macros/CMakeLists.txt (+6)
- (added) libc/include/llvm-libc-macros/endian-macros.h (+16)
``````````diff
diff --git a/libc/config/linux/aarch64/headers.txt b/libc/config/linux/aarch64/headers.txt
index 05f15a0e4e5cbb..7ff55899805508 100644
--- a/libc/config/linux/aarch64/headers.txt
+++ b/libc/config/linux/aarch64/headers.txt
@@ -4,6 +4,7 @@ set(TARGET_PUBLIC_HEADERS
libc.include.ctype
libc.include.dlfcn
libc.include.elf
+ libc.include.endian
libc.include.errno
libc.include.features
libc.include.fenv
diff --git a/libc/config/linux/x86_64/headers.txt b/libc/config/linux/x86_64/headers.txt
index 8750100302ea7e..fe1fd596960dd3 100644
--- a/libc/config/linux/x86_64/headers.txt
+++ b/libc/config/linux/x86_64/headers.txt
@@ -5,6 +5,7 @@ set(TARGET_PUBLIC_HEADERS
libc.include.dirent
libc.include.dlfcn
libc.include.elf
+ libc.include.endian
libc.include.errno
libc.include.fcntl
libc.include.features
diff --git a/libc/include/CMakeLists.txt b/libc/include/CMakeLists.txt
index e5ceea360d3965..96d715cde9de9d 100644
--- a/libc/include/CMakeLists.txt
+++ b/libc/include/CMakeLists.txt
@@ -73,6 +73,15 @@ add_header_macro(
.llvm_libc_common_h
)
+add_header_macro(
+ endian
+ ../libc/include/endian.yaml
+ endian.h
+ DEPENDS
+ .llvm-libc-macros.endian_macros
+ .llvm_libc_common_h
+)
+
add_header_macro(
features
../libc/include/features.yaml
diff --git a/libc/include/endian.h.def b/libc/include/endian.h.def
new file mode 100644
index 00000000000000..8448d93a86acc3
--- /dev/null
+++ b/libc/include/endian.h.def
@@ -0,0 +1,17 @@
+//===-- System V header endian.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 LLVM_LIBC_ENDIAN_H
+#define LLVM_LIBC_ENDIAN_H
+
+#include "__llvm-libc-common.h"
+#include "llvm-libc-macros/endian-macros.h"
+
+%%public_api()
+
+#endif // LLVM_LIBC_ENDIAN_H
diff --git a/libc/include/endian.yaml b/libc/include/endian.yaml
new file mode 100644
index 00000000000000..6497f897b63933
--- /dev/null
+++ b/libc/include/endian.yaml
@@ -0,0 +1,9 @@
+header: endian.h
+header_template: endian.h.def
+standards:
+ - POSIX
+macros: []
+types: []
+enums: []
+objects: []
+functions: []
diff --git a/libc/include/llvm-libc-macros/CMakeLists.txt b/libc/include/llvm-libc-macros/CMakeLists.txt
index 9d5d9f65442889..d165ada6612c84 100644
--- a/libc/include/llvm-libc-macros/CMakeLists.txt
+++ b/libc/include/llvm-libc-macros/CMakeLists.txt
@@ -310,6 +310,12 @@ add_macro_header(
elf-macros.h
)
+add_macro_header(
+ endian_macros
+ HDR
+ endian-macros.h
+)
+
add_macro_header(
locale_macros
HDR
diff --git a/libc/include/llvm-libc-macros/endian-macros.h b/libc/include/llvm-libc-macros/endian-macros.h
new file mode 100644
index 00000000000000..94e1d60f8ff404
--- /dev/null
+++ b/libc/include/llvm-libc-macros/endian-macros.h
@@ -0,0 +1,16 @@
+//===-- Definition of macros from endian.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 LLVM_LIBC_MACROS_ENDIAN_MACROS_H
+#define LLVM_LIBC_MACROS_ENDIAN_MACROS_H
+
+#define LITTLE_ENDIAN __ORDER_LITTLE_ENDIAN__
+#define BIG_ENDIAN __ORDER_BIG_ENDIAN__
+#define BYTE_ORDER __BYTE_ORDER__
+
+#endif // LLVM_LIBC_MACROS_ENDIAN_MACROS_H
``````````
</details>
https://github.com/llvm/llvm-project/pull/125168
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