Actually enables IOV features in createdump (#31782)

src/coreclr/src/debug/createdump/CMakeLists.txt

@@ -2,6 +2,8 @@ project(createdump)
 
 set(CMAKE_INCLUDE_CURRENT_DIR ON)
 
+include(configure.cmake)
+
 # Set the RPATH of createdump so that it can find dependencies without needing to set LD_LIBRARY_PATH
 # For more information: http://www.cmake.org/Wiki/CMake_RPATH_handling.
 if (CORECLR_SET_RPATH)

src/coreclr/src/debug/createdump/config.h.in

@@ -0,0 +1,7 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+#pragma once
+
+#cmakedefine HAVE_PROCESS_VM_READV

src/coreclr/src/debug/createdump/configure.cmake

@@ -0,0 +1,3 @@
+check_function_exists(process_vm_readv HAVE_PROCESS_VM_READV)
+
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/config.h.in ${CMAKE_CURRENT_BINARY_DIR}/config.h)

src/coreclr/src/debug/createdump/createdump.h

@@ -16,6 +16,8 @@ extern bool g_diagnostics;
             printf(args); \
         }
 
+#include "config.h"
+
 #include <winternl.h>
 #include <winver.h>
 #include <windows.h>

src/coreclr/src/pal/src/configure.cmake

@@ -126,7 +126,6 @@ check_function_exists(semget HAS_SYSV_SEMAPHORES)
 check_function_exists(pthread_mutex_init HAS_PTHREAD_MUTEXES)
 check_function_exists(ttrace HAVE_TTRACE)
 check_function_exists(pipe2 HAVE_PIPE2)
-check_function_exists(process_vm_readv HAVE_PROCESS_VM_READV)
 
 check_cxx_source_compiles("
 #include <pthread_np.h>