[libc][annex_k] Add constraint_handler_t.

libc/hdr/types/CMakeLists.txt

@@ -170,6 +170,15 @@ add_proxy_header_library(
     libc.include.fcntl
 )
 
+add_proxy_header_library(
+  constraint_handler_t
+  HDRS
+    constraint_handler_t.h
+  FULL_BUILD_DEPENDS
+    libc.include.llvm-libc-types.constraint_handler_t
+    libc.include.stdlib
+)
+
 add_proxy_header_library(
   errno_t
   HDRS

libc/hdr/types/constraint_handler_t.h

@@ -0,0 +1,18 @@
+//===-- Proxy for constraint_handler_t ------------------------------------===//
+//
+// 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_HDR_TYPES_CONSTRAINT_HANDLER_T_H
+#define LLVM_LIBC_HDR_TYPES_CONSTRAINT_HANDLER_T_H
+
+#define LIBC_HAS_ANNEX_K
+
+#include "include/llvm-libc-types/constraint_handler_t.h"
+
+#undef LIBC_HAS_ANNEX_K
+
+#endif // LLVM_LIBC_HDR_TYPES_CONSTRAINT_HANDLER_T_H

libc/include/CMakeLists.txt

@@ -366,6 +366,7 @@ add_header_macro(
     .llvm-libc-types.__qsortcompare_t
     .llvm-libc-types.__qsortrcompare_t
     .llvm-libc-types.__search_compare_t
+    .llvm-libc-types.constraint_handler_t
     .llvm-libc-types.div_t
     .llvm-libc-types.ldiv_t
     .llvm-libc-types.lldiv_t

libc/include/llvm-libc-types/CMakeLists.txt

@@ -31,6 +31,7 @@ add_header(DIR HDR DIR.h)
 add_header(dev_t HDR dev_t.h)
 add_header(div_t HDR div_t.h)
 add_header(errno_t HDR errno_t.h)
+add_header(constraint_handler_t HDR constraint_handler_t.h DEPENDS .errno_t)
 add_header(ldiv_t HDR ldiv_t.h)
 add_header(lldiv_t HDR lldiv_t.h)
 add_header(FILE HDR FILE.h)

libc/include/llvm-libc-types/constraint_handler_t.h

@@ -0,0 +1,21 @@
+//===-- Definition of type constraint_handler_t ---------------------------===//
+//
+// 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_INCLUDE_LLVM_LIBC_TYPES_CONSTRAINT_HANDLER_T_H
+#define LLVM_LIBC_INCLUDE_LLVM_LIBC_TYPES_CONSTRAINT_HANDLER_T_H
+
+#include "errno_t.h"
+
+#ifdef LIBC_HAS_ANNEX_K
+
+typedef void (*constraint_handler_t)(const char *__restrict, void *__restrict,
+                                     errno_t);
+
+#endif // LIBC_HAS_ANNEX_K
+
+#endif // LLVM_LIBC_INCLUDE_LLVM_LIBC_TYPES_CONSTRAINT_HANDLER_T_H

libc/include/stdlib.yaml

@@ -12,6 +12,7 @@ types:
   - type_name: __qsortcompare_t
   - type_name: __qsortrcompare_t
   - type_name: __search_compare_t
+  - type_name: constraint_handler_t
   - type_name: div_t
   - type_name: ldiv_t
   - type_name: lldiv_t