[libc] Add langinfo.h header generation, macros, and types by kaladron · Pull Request #210941 · llvm/llvm-project

kaladron · 2026-07-21T10:50:27Z

Add header generation support for langinfo.h, including nl_item type definition, langinfo macros, and YAML header specification.

libc/include/llvm-libc-types/nl_item.h: Define nl_item type
libc/include/llvm-libc-macros/langinfo-macros.h: Define POSIX macros
libc/include/langinfo.yaml: Define langinfo.h interface
libc/include/langinfo.h.def: Header template
libc/config/linux/*/headers.txt: Enable langinfo header for Linux

Assisted-by: Automated tooling, human reviewed.

llvmorg-github-actions · 2026-07-21T11:00:00Z

@llvm/pr-subscribers-libc

Author: Jeff Bailey (kaladron)

Changes

Add header generation support for langinfo.h, including nl_item type definition, langinfo macros, and YAML header specification.

libc/include/llvm-libc-types/nl_item.h: Define nl_item type
libc/include/llvm-libc-macros/langinfo-macros.h: Define POSIX macros
libc/include/langinfo.yaml: Define langinfo.h interface
libc/include/langinfo.h.def: Header template
libc/config/linux/*/headers.txt: Enable langinfo header for Linux

Assisted-by: Automated tooling, human reviewed.

Full diff: https://github.com/llvm/llvm-project/pull/210941.diff

12 Files Affected:

(modified) libc/config/linux/aarch64/headers.txt (+1)
(modified) libc/config/linux/arm/headers.txt (+1)
(modified) libc/config/linux/i386/headers.txt (+1)
(modified) libc/config/linux/riscv/headers.txt (+1)
(modified) libc/config/linux/x86_64/headers.txt (+1)
(modified) libc/include/CMakeLists.txt (+11)
(added) libc/include/langinfo.h.def (+23)
(added) libc/include/langinfo.yaml (+131)
(modified) libc/include/llvm-libc-macros/CMakeLists.txt (+8)
(added) libc/include/llvm-libc-macros/langinfo-macros.h (+86)
(modified) libc/include/llvm-libc-types/CMakeLists.txt (+1)
(added) libc/include/llvm-libc-types/nl_item.h (+19)

diff --git a/libc/config/linux/aarch64/headers.txt b/libc/config/linux/aarch64/headers.txt
index 2cb33a2f75416..a0dae81f46e6e 100644
--- a/libc/config/linux/aarch64/headers.txt
+++ b/libc/config/linux/aarch64/headers.txt
@@ -16,6 +16,7 @@ set(TARGET_PUBLIC_HEADERS
     libc.include.fenv
     libc.include.float
     libc.include.inttypes
+    libc.include.langinfo
     libc.include.libgen
     libc.include.limits
     libc.include.link
diff --git a/libc/config/linux/arm/headers.txt b/libc/config/linux/arm/headers.txt
index 43f233637c35e..cc0a509d6921a 100644
--- a/libc/config/linux/arm/headers.txt
+++ b/libc/config/linux/arm/headers.txt
@@ -7,6 +7,7 @@ set(TARGET_PUBLIC_HEADERS
     libc.include.fenv
     libc.include.float
     libc.include.inttypes
+    libc.include.langinfo
     libc.include.libgen
     libc.include.malloc
     libc.include.math
diff --git a/libc/config/linux/i386/headers.txt b/libc/config/linux/i386/headers.txt
index cce115d5f59df..def05189f136d 100644
--- a/libc/config/linux/i386/headers.txt
+++ b/libc/config/linux/i386/headers.txt
@@ -2,4 +2,5 @@ set(TARGET_PUBLIC_HEADERS
   libc.include.alloca
   libc.include.assert
   libc.include.cpio
+  libc.include.langinfo
 )
diff --git a/libc/config/linux/riscv/headers.txt b/libc/config/linux/riscv/headers.txt
index 29ae0d8b4ecfa..81af60dbf429d 100644
--- a/libc/config/linux/riscv/headers.txt
+++ b/libc/config/linux/riscv/headers.txt
@@ -16,6 +16,7 @@ set(TARGET_PUBLIC_HEADERS
     libc.include.fenv
     libc.include.float
     libc.include.inttypes
+    libc.include.langinfo
     libc.include.libgen
     libc.include.limits
     libc.include.link
diff --git a/libc/config/linux/x86_64/headers.txt b/libc/config/linux/x86_64/headers.txt
index 9786b60fa2022..8e19e2a4b5a33 100644
--- a/libc/config/linux/x86_64/headers.txt
+++ b/libc/config/linux/x86_64/headers.txt
@@ -16,6 +16,7 @@ set(TARGET_PUBLIC_HEADERS
     libc.include.fenv
     libc.include.float
     libc.include.inttypes
+    libc.include.langinfo
     libc.include.libgen
     libc.include.limits
     libc.include.link
diff --git a/libc/include/CMakeLists.txt b/libc/include/CMakeLists.txt
index a87a2c5e39ad4..e3cbbd059774a 100644
--- a/libc/include/CMakeLists.txt
+++ b/libc/include/CMakeLists.txt
@@ -1069,6 +1069,17 @@ add_header_macro(
     .llvm-libc-types.nl_catd
   )
 
+add_header_macro(
+  langinfo
+  ../libc/include/langinfo.yaml
+  langinfo.h
+  DEPENDS
+    .llvm_libc_common_h
+    .llvm-libc-macros.langinfo_macros
+    .llvm-libc-types.nl_item
+    .llvm-libc-types.locale_t
+  )
+
 # UEFI spec references "Uefi.h" so we use that name for compatibility
 add_header_macro(
   uefi
diff --git a/libc/include/langinfo.h.def b/libc/include/langinfo.h.def
new file mode 100644
index 0000000000000..0f723dfc266be
--- /dev/null
+++ b/libc/include/langinfo.h.def
@@ -0,0 +1,23 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// POSIX header langinfo.h template.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_LANGINFO_H
+#define LLVM_LIBC_LANGINFO_H
+
+#include "__llvm-libc-common.h"
+
+#include "llvm-libc-macros/langinfo-macros.h"
+
+%%public_api()
+
+#endif // LLVM_LIBC_LANGINFO_H
diff --git a/libc/include/langinfo.yaml b/libc/include/langinfo.yaml
new file mode 100644
index 0000000000000..4afd89e01ed7e
--- /dev/null
+++ b/libc/include/langinfo.yaml
@@ -0,0 +1,131 @@
+header: langinfo.h
+standards:
+  - posix
+macros:
+  - macro_name: CODESET
+    macro_header: langinfo-macros.h
+  - macro_name: D_T_FMT
+    macro_header: langinfo-macros.h
+  - macro_name: D_FMT
+    macro_header: langinfo-macros.h
+  - macro_name: T_FMT
+    macro_header: langinfo-macros.h
+  - macro_name: T_FMT_AMPM
+    macro_header: langinfo-macros.h
+  - macro_name: AM_STR
+    macro_header: langinfo-macros.h
+  - macro_name: PM_STR
+    macro_header: langinfo-macros.h
+  - macro_name: DAY_1
+    macro_header: langinfo-macros.h
+  - macro_name: DAY_2
+    macro_header: langinfo-macros.h
+  - macro_name: DAY_3
+    macro_header: langinfo-macros.h
+  - macro_name: DAY_4
+    macro_header: langinfo-macros.h
+  - macro_name: DAY_5
+    macro_header: langinfo-macros.h
+  - macro_name: DAY_6
+    macro_header: langinfo-macros.h
+  - macro_name: DAY_7
+    macro_header: langinfo-macros.h
+  - macro_name: ABDAY_1
+    macro_header: langinfo-macros.h
+  - macro_name: ABDAY_2
+    macro_header: langinfo-macros.h
+  - macro_name: ABDAY_3
+    macro_header: langinfo-macros.h
+  - macro_name: ABDAY_4
+    macro_header: langinfo-macros.h
+  - macro_name: ABDAY_5
+    macro_header: langinfo-macros.h
+  - macro_name: ABDAY_6
+    macro_header: langinfo-macros.h
+  - macro_name: ABDAY_7
+    macro_header: langinfo-macros.h
+  - macro_name: MON_1
+    macro_header: langinfo-macros.h
+  - macro_name: MON_2
+    macro_header: langinfo-macros.h
+  - macro_name: MON_3
+    macro_header: langinfo-macros.h
+  - macro_name: MON_4
+    macro_header: langinfo-macros.h
+  - macro_name: MON_5
+    macro_header: langinfo-macros.h
+  - macro_name: MON_6
+    macro_header: langinfo-macros.h
+  - macro_name: MON_7
+    macro_header: langinfo-macros.h
+  - macro_name: MON_8
+    macro_header: langinfo-macros.h
+  - macro_name: MON_9
+    macro_header: langinfo-macros.h
+  - macro_name: MON_10
+    macro_header: langinfo-macros.h
+  - macro_name: MON_11
+    macro_header: langinfo-macros.h
+  - macro_name: MON_12
+    macro_header: langinfo-macros.h
+  - macro_name: ABMON_1
+    macro_header: langinfo-macros.h
+  - macro_name: ABMON_2
+    macro_header: langinfo-macros.h
+  - macro_name: ABMON_3
+    macro_header: langinfo-macros.h
+  - macro_name: ABMON_4
+    macro_header: langinfo-macros.h
+  - macro_name: ABMON_5
+    macro_header: langinfo-macros.h
+  - macro_name: ABMON_6
+    macro_header: langinfo-macros.h
+  - macro_name: ABMON_7
+    macro_header: langinfo-macros.h
+  - macro_name: ABMON_8
+    macro_header: langinfo-macros.h
+  - macro_name: ABMON_9
+    macro_header: langinfo-macros.h
+  - macro_name: ABMON_10
+    macro_header: langinfo-macros.h
+  - macro_name: ABMON_11
+    macro_header: langinfo-macros.h
+  - macro_name: ABMON_12
+    macro_header: langinfo-macros.h
+  - macro_name: ERA
+    macro_header: langinfo-macros.h
+  - macro_name: ERA_D_FMT
+    macro_header: langinfo-macros.h
+  - macro_name: ERA_D_T_FMT
+    macro_header: langinfo-macros.h
+  - macro_name: ERA_T_FMT
+    macro_header: langinfo-macros.h
+  - macro_name: ALT_DIGITS
+    macro_header: langinfo-macros.h
+  - macro_name: RADIXCHAR
+    macro_header: langinfo-macros.h
+  - macro_name: THOUSEP
+    macro_header: langinfo-macros.h
+  - macro_name: YESEXPR
+    macro_header: langinfo-macros.h
+  - macro_name: NOEXPR
+    macro_header: langinfo-macros.h
+  - macro_name: CRNCYSTR
+    macro_header: langinfo-macros.h
+types:
+  - type_name: nl_item
+  - type_name: locale_t
+functions:
+  - name: nl_langinfo
+    standards:
+      - posix
+    return_type: char *
+    arguments:
+      - type: nl_item
+  - name: nl_langinfo_l
+    standards:
+      - posix
+    return_type: char *
+    arguments:
+      - type: nl_item
+      - type: locale_t
diff --git a/libc/include/llvm-libc-macros/CMakeLists.txt b/libc/include/llvm-libc-macros/CMakeLists.txt
index 8babf3c69ebf6..3e7bdd1bed7a6 100644
--- a/libc/include/llvm-libc-macros/CMakeLists.txt
+++ b/libc/include/llvm-libc-macros/CMakeLists.txt
@@ -406,6 +406,14 @@ add_macro_header(
     locale-macros.h
 )
 
+add_macro_header(
+  langinfo_macros
+  HDR
+    langinfo-macros.h
+  DEPENDS
+    .locale_macros
+)
+
 add_macro_header(
   nl_types_macros
   HDR
diff --git a/libc/include/llvm-libc-macros/langinfo-macros.h b/libc/include/llvm-libc-macros/langinfo-macros.h
new file mode 100644
index 0000000000000..11048de6f488e
--- /dev/null
+++ b/libc/include/llvm-libc-macros/langinfo-macros.h
@@ -0,0 +1,86 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// Definition of macros from langinfo.h.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_LANGINFO_MACROS_H
+#define LLVM_LIBC_MACROS_LANGINFO_MACROS_H
+
+#include "locale-macros.h"
+
+#define _NL_ITEM(category, index) (((category) << 16) | (index))
+
+#define CODESET _NL_ITEM(LC_CTYPE, 0)
+
+#define RADIXCHAR _NL_ITEM(LC_NUMERIC, 0)
+#define THOUSEP _NL_ITEM(LC_NUMERIC, 1)
+
+#define D_T_FMT _NL_ITEM(LC_TIME, 0)
+#define D_FMT _NL_ITEM(LC_TIME, 1)
+#define T_FMT _NL_ITEM(LC_TIME, 2)
+#define T_FMT_AMPM _NL_ITEM(LC_TIME, 3)
+#define AM_STR _NL_ITEM(LC_TIME, 4)
+#define PM_STR _NL_ITEM(LC_TIME, 5)
+
+#define DAY_1 _NL_ITEM(LC_TIME, 6)
+#define DAY_2 _NL_ITEM(LC_TIME, 7)
+#define DAY_3 _NL_ITEM(LC_TIME, 8)
+#define DAY_4 _NL_ITEM(LC_TIME, 9)
+#define DAY_5 _NL_ITEM(LC_TIME, 10)
+#define DAY_6 _NL_ITEM(LC_TIME, 11)
+#define DAY_7 _NL_ITEM(LC_TIME, 12)
+
+#define ABDAY_1 _NL_ITEM(LC_TIME, 13)
+#define ABDAY_2 _NL_ITEM(LC_TIME, 14)
+#define ABDAY_3 _NL_ITEM(LC_TIME, 15)
+#define ABDAY_4 _NL_ITEM(LC_TIME, 16)
+#define ABDAY_5 _NL_ITEM(LC_TIME, 17)
+#define ABDAY_6 _NL_ITEM(LC_TIME, 18)
+#define ABDAY_7 _NL_ITEM(LC_TIME, 19)
+
+#define MON_1 _NL_ITEM(LC_TIME, 20)
+#define MON_2 _NL_ITEM(LC_TIME, 21)
+#define MON_3 _NL_ITEM(LC_TIME, 22)
+#define MON_4 _NL_ITEM(LC_TIME, 23)
+#define MON_5 _NL_ITEM(LC_TIME, 24)
+#define MON_6 _NL_ITEM(LC_TIME, 25)
+#define MON_7 _NL_ITEM(LC_TIME, 26)
+#define MON_8 _NL_ITEM(LC_TIME, 27)
+#define MON_9 _NL_ITEM(LC_TIME, 28)
+#define MON_10 _NL_ITEM(LC_TIME, 29)
+#define MON_11 _NL_ITEM(LC_TIME, 30)
+#define MON_12 _NL_ITEM(LC_TIME, 31)
+
+#define ABMON_1 _NL_ITEM(LC_TIME, 32)
+#define ABMON_2 _NL_ITEM(LC_TIME, 33)
+#define ABMON_3 _NL_ITEM(LC_TIME, 34)
+#define ABMON_4 _NL_ITEM(LC_TIME, 35)
+#define ABMON_5 _NL_ITEM(LC_TIME, 36)
+#define ABMON_6 _NL_ITEM(LC_TIME, 37)
+#define ABMON_7 _NL_ITEM(LC_TIME, 38)
+#define ABMON_8 _NL_ITEM(LC_TIME, 39)
+#define ABMON_9 _NL_ITEM(LC_TIME, 40)
+#define ABMON_10 _NL_ITEM(LC_TIME, 41)
+#define ABMON_11 _NL_ITEM(LC_TIME, 42)
+#define ABMON_12 _NL_ITEM(LC_TIME, 43)
+
+#define ERA _NL_ITEM(LC_TIME, 44)
+#define ERA_D_FMT _NL_ITEM(LC_TIME, 45)
+#define ERA_D_T_FMT _NL_ITEM(LC_TIME, 46)
+#define ERA_T_FMT _NL_ITEM(LC_TIME, 47)
+#define ALT_DIGITS _NL_ITEM(LC_TIME, 48)
+
+#define CRNCYSTR _NL_ITEM(LC_MONETARY, 0)
+
+#define YESEXPR _NL_ITEM(LC_MESSAGES, 0)
+#define NOEXPR _NL_ITEM(LC_MESSAGES, 1)
+
+#endif // LLVM_LIBC_MACROS_LANGINFO_MACROS_H
diff --git a/libc/include/llvm-libc-types/CMakeLists.txt b/libc/include/llvm-libc-types/CMakeLists.txt
index 5ea8ca0634834..070ee0c585694 100644
--- a/libc/include/llvm-libc-types/CMakeLists.txt
+++ b/libc/include/llvm-libc-types/CMakeLists.txt
@@ -81,6 +81,7 @@ add_header(mode_t HDR mode_t.h)
 add_header(mtx_t HDR mtx_t.h DEPENDS .__futex_word .__mutex_type)
 add_header(nfds_t HDR nfds_t.h)
 add_header(nl_catd HDR nl_catd.h)
+add_header(nl_item HDR nl_item.h)
 add_header(nlink_t HDR nlink_t.h)
 add_header(off_t HDR off_t.h)
 add_header(once_flag HDR once_flag.h DEPENDS .__futex_word)
diff --git a/libc/include/llvm-libc-types/nl_item.h b/libc/include/llvm-libc-types/nl_item.h
new file mode 100644
index 0000000000000..4b3a32ccd2d05
--- /dev/null
+++ b/libc/include/llvm-libc-types/nl_item.h
@@ -0,0 +1,19 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// Definition of nl_item type.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_NL_ITEM_H
+#define LLVM_LIBC_TYPES_NL_ITEM_H
+
+typedef int nl_item;
+
+#endif // LLVM_LIBC_TYPES_NL_ITEM_H

labath

LGTM. Just remove the header template.

vonosmas

+1 on Pavel's comment, LGTM otherwise

Add header generation support for langinfo.h, including nl_item type definition, langinfo macros, and YAML header specification. * libc/include/llvm-libc-types/nl_item.h: Define nl_item type * libc/include/llvm-libc-macros/langinfo-macros.h: Define POSIX macros * libc/include/langinfo.yaml: Define langinfo.h interface * libc/include/langinfo.h.def: Header template * libc/config/linux/*/headers.txt: Enable langinfo header for Linux Assisted-by: Automated tooling, human reviewed.

kaladron marked this pull request as ready for review July 21, 2026 10:59

kaladron requested a review from a team as a code owner July 21, 2026 10:59

llvmorg-github-actions Bot added the libc label Jul 21, 2026

kaladron requested a review from labath July 21, 2026 10:59

labath approved these changes Jul 21, 2026

View reviewed changes

Comment thread libc/include/langinfo.h.def Outdated

kaladron force-pushed the langinfo-pr1 branch 2 times, most recently from 00d8be1 to c3e4aa5 Compare July 21, 2026 13:37

vonosmas approved these changes Jul 21, 2026

View reviewed changes

kaladron force-pushed the langinfo-pr1 branch from c3e4aa5 to 14eca13 Compare July 22, 2026 10:39

kaladron enabled auto-merge (squash) July 22, 2026 10:40

kaladron merged commit 6d0e882 into llvm:main Jul 22, 2026
44 checks passed

kaladron deleted the langinfo-pr1 branch July 23, 2026 06:48

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[libc] Add langinfo.h header generation, macros, and types - #210941

[libc] Add langinfo.h header generation, macros, and types#210941
kaladron merged 1 commit into
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kaladron commented Jul 21, 2026

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