[libc] Add proxy header for ACTION type.

libc/hdr/types/ACTION.h

@@ -0,0 +1,22 @@
+//===-- Proxy header for ACTION -------------------------------------------===//
+//
+// 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_ACTION_H
+#define LLVM_LIBC_HDR_TYPES_ACTION_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/ACTION.h"
+
+#else // Overlay mode
+
+#include <search.h>
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_ACTION_H

libc/hdr/types/CMakeLists.txt

@@ -383,3 +383,12 @@ add_proxy_header_library(
     libc.include.llvm-libc-types.ENTRY
     libc.include.search
 )
+
+add_proxy_header_library(
+  ACTION
+  HDRS
+    ACTION.h
+  FULL_BUILD_DEPENDS
+    libc.include.llvm-libc-types.ACTION
+    libc.include.search
+)

libc/src/search/CMakeLists.txt

@@ -34,6 +34,7 @@ add_entrypoint_object(
   HDRS
     hsearch.h
   DEPENDS
+    libc.hdr.types.ACTION
     libc.hdr.types.ENTRY
     libc.src.search.hsearch.global
     libc.src.__support.HashTable.table
@@ -48,6 +49,7 @@ add_entrypoint_object(
   HDRS
     hsearch_r.h
   DEPENDS
+    libc.hdr.types.ACTION
     libc.hdr.types.ENTRY
     libc.src.__support.HashTable.table
     libc.src.errno.errno

libc/src/search/hsearch.h

@@ -9,9 +9,9 @@
 #ifndef LLVM_LIBC_SRC_SEARCH_HSEARCH_H
 #define LLVM_LIBC_SRC_SEARCH_HSEARCH_H
 
+#include "hdr/types/ACTION.h"
 #include "hdr/types/ENTRY.h"
 #include "src/__support/macros/config.h"
-#include <search.h> // ACTION
 
 namespace LIBC_NAMESPACE_DECL {
 ENTRY *hsearch(ENTRY item, ACTION action);

libc/src/search/hsearch_r.h

@@ -9,9 +9,10 @@
 #ifndef LLVM_LIBC_SRC_SEARCH_HSEARCH_R_H
 #define LLVM_LIBC_SRC_SEARCH_HSEARCH_R_H
 
+#include "hdr/types/ACTION.h"
 #include "hdr/types/ENTRY.h"
 #include "src/__support/macros/config.h"
-#include <search.h> // ACTION
+#include <search.h> // hsearch_data
 
 namespace LIBC_NAMESPACE_DECL {
 int hsearch_r(ENTRY item, ACTION action, ENTRY **retval,