[libc] Add proxy header for the stack_t type (llvm#107559)

added proxy header for the stack_t type and modified the corresponding
CMakeLists.txt files

Author: wldfngrs

libc/hdr/types/CMakeLists.txt

@@ -181,3 +181,12 @@ add_proxy_header_library(
     libc.include.signal
 )
 
+add_proxy_header_library(
+  stack_t
+  HDRS
+    stack_t.h
+  FULL_BUILD_DEPENDS
+    libc.include.llvm-libc-types.stack_t
+    libc.include.signal
+)
+

libc/hdr/types/stack_t.h

@@ -0,0 +1,23 @@
+//===-- Definition of stack_t.h -------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https:llvm.or/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_HDR_STACK_T_H
+#define LLVM_LIBC_HDR_STACK_T_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/stack_t.h"
+
+#else // overlay mode
+
+#include <signal.h>
+
+#endif // LLVM_LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_STACK_T_H

libc/src/signal/linux/CMakeLists.txt

@@ -77,6 +77,7 @@ add_entrypoint_object(
     libc.include.sys_syscall
     libc.src.__support.OSUtil.osutil
     libc.src.errno.errno
+    libc.hdr.types.stack_t
 )
 
 add_entrypoint_object(

libc/src/signal/linux/sigaltstack.cpp

@@ -7,13 +7,13 @@
 //===----------------------------------------------------------------------===//
 
 #include "src/signal/sigaltstack.h"
+#include "hdr/types/stack_t.h"
 #include "src/__support/macros/config.h"
 #include "src/errno/libc_errno.h"
 #include "src/signal/linux/signal_utils.h"
 
 #include "src/__support/common.h"
 
-#include <signal.h>
 #include <sys/syscall.h>
 
 namespace LIBC_NAMESPACE_DECL {

libc/src/signal/sigaltstack.h

@@ -9,8 +9,8 @@
 #ifndef LLVM_LIBC_SRC_SIGNAL_SIGALTSTACK_H
 #define LLVM_LIBC_SRC_SIGNAL_SIGALTSTACK_H
 
+#include "hdr/types/stack_t.h"
 #include "src/__support/macros/config.h"
-#include <signal.h>
 
 namespace LIBC_NAMESPACE_DECL {