From 1265d4b2dec6b0d754742cc8246cb7037a662a1b Mon Sep 17 00:00:00 2001
From: Dana Robinson <43805+derobins@users.noreply.github.com>
Date: Sat, 16 Mar 2024 12:01:24 -0700
Subject: [PATCH] Remove HAVE_IOEO checks from CMake (#4160)

This was intended to check for thread-safety functionality on Windows.
The required functionality has been standard since Windows Vista, so
these checks can be removed.
---
 CMakeLists.txt                     |  4 +-
 config/cmake/ConfigureChecks.cmake | 65 ++++--------------------------
 config/cmake/HDFTests.c            | 18 ---------
 3 files changed, 10 insertions(+), 77 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index cb8b596b7d7..81a6e96b6fe 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -919,8 +919,8 @@ if (HDF5_ENABLE_THREADSAFE)
       message (VERBOSE " **** Allowing unsupported HL and thread-safety options **** ")
     endif ()
   endif ()
-  if (H5_HAVE_IOEO)
-    message (VERBOSE " **** Win32 threads requires WINVER>=0x600 (Windows Vista/7/8) **** ")
+  if (WIN32)
+    # When Win32 is available, we use those threads
     set (H5_HAVE_WIN_THREADS 1)
   else ()
     if (NOT H5_HAVE_PTHREAD_H)
diff --git a/config/cmake/ConfigureChecks.cmake b/config/cmake/ConfigureChecks.cmake
index 86a96cead0c..2905fe9ad08 100644
--- a/config/cmake/ConfigureChecks.cmake
+++ b/config/cmake/ConfigureChecks.cmake
@@ -261,6 +261,13 @@ endif ()
 #
 # https://docs.oracle.com/cd/E23824_01/html/821-1474/lfcompile-5.html
 
+# MinGW and Cygwin
+if (MINGW OR CYGWIN)
+  set (CMAKE_REQUIRED_DEFINITIONS
+    "${CURRENT_TEST_DEFINITIONS} -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE"
+  )
+endif ()
+
 #-----------------------------------------------------------------------------
 #  Check the size in bytes of all the int and float types
 #-----------------------------------------------------------------------------
@@ -326,7 +333,7 @@ if (MINGW OR NOT WINDOWS)
 endif ()
 
 HDF_CHECK_TYPE_SIZE (off_t          ${HDF_PREFIX}_SIZEOF_OFF_T)
-HDF_CHECK_TYPE_SIZE (time_t          ${HDF_PREFIX}_SIZEOF_TIME_T)
+HDF_CHECK_TYPE_SIZE (time_t         ${HDF_PREFIX}_SIZEOF_TIME_T)
 
 #-----------------------------------------------------------------------------
 # Extra C99 types
@@ -439,62 +446,6 @@ if (MINGW OR NOT WINDOWS)
   endforeach ()
 endif ()
 
-#-----------------------------------------------------------------------------
-# Check if InitOnceExecuteOnce is available
-#-----------------------------------------------------------------------------
-if (WINDOWS)
-  if (NOT HDF_NO_IOEO_TEST)
-    message (VERBOSE "Checking for InitOnceExecuteOnce:")
-  if (NOT DEFINED ${HDF_PREFIX}_HAVE_IOEO)
-    if (LARGEFILE)
-      set (CMAKE_REQUIRED_DEFINITIONS
-          "${CURRENT_TEST_DEFINITIONS} -D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE"
-      )
-    endif ()
-    set (MACRO_CHECK_FUNCTION_DEFINITIONS "-DHAVE_IOEO ${CMAKE_REQUIRED_FLAGS}")
-    if (CMAKE_REQUIRED_INCLUDES)
-      set (CHECK_C_SOURCE_COMPILES_ADD_INCLUDES "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")
-    else ()
-      set (CHECK_C_SOURCE_COMPILES_ADD_INCLUDES)
-    endif ()
-
-    TRY_RUN(HAVE_IOEO_EXITCODE HAVE_IOEO_COMPILED
-        ${CMAKE_BINARY_DIR}
-        ${HDF_RESOURCES_DIR}/HDFTests.c
-        COMPILE_DEFINITIONS "${CMAKE_REQUIRED_DEFINITIONS} ${MACRO_CHECK_FUNCTION_DEFINITIONS}"
-        LINK_LIBRARIES "${HDF5_REQUIRED_LIBRARIES}"
-        CMAKE_FLAGS "${CHECK_C_SOURCE_COMPILES_ADD_INCLUDES} -DCMAKE_SKIP_RPATH:BOOL=${CMAKE_SKIP_RPATH}"
-        COMPILE_OUTPUT_VARIABLE OUTPUT
-    )
-    # if it did not compile make the return value fail code of 1
-    if (NOT HAVE_IOEO_COMPILED)
-      set (HAVE_IOEO_EXITCODE 1)
-    endif ()
-    # if the return value was 0 then it worked
-    if ("${HAVE_IOEO_EXITCODE}" EQUAL 0)
-      set (${HDF_PREFIX}_HAVE_IOEO 1 CACHE INTERNAL "Test InitOnceExecuteOnce")
-      message (VERBOSE "Performing Test InitOnceExecuteOnce - Success")
-      file (APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
-        "Performing C SOURCE FILE Test InitOnceExecuteOnce succeeded with the following output:\n"
-        "${OUTPUT}\n"
-        "Return value: ${HAVE_IOEO}\n")
-    else ()
-      if (CMAKE_CROSSCOMPILING AND "${HAVE_IOEO_EXITCODE}" MATCHES  "FAILED_TO_RUN")
-        set (${HDF_PREFIX}_HAVE_IOEO "${HAVE_IOEO_EXITCODE}")
-      else ()
-        set (${HDF_PREFIX}_HAVE_IOEO "" CACHE INTERNAL "Test InitOnceExecuteOnce")
-      endif ()
-
-      message (VERBOSE "Performing Test InitOnceExecuteOnce - Failed")
-      file (APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
-        "Performing InitOnceExecuteOnce Test  failed with the following output:\n"
-        "${OUTPUT}\n"
-        "Return value: ${HAVE_IOEO_EXITCODE}\n")
-    endif ()
-  endif ()
-  endif ()
-endif ()
-
 # ----------------------------------------------------------------------
 # Set the flag to indicate that the machine can handle converting
 # denormalized floating-point values.
diff --git a/config/cmake/HDFTests.c b/config/cmake/HDFTests.c
index 3d16721346c..73f7739bac1 100644
--- a/config/cmake/HDFTests.c
+++ b/config/cmake/HDFTests.c
@@ -126,21 +126,3 @@ main(void)
 #endif
 }
 #endif
-
-#ifdef HAVE_IOEO
-
-#include <windows.h>
-typedef void (WINAPI *PGNSI)(LPSYSTEM_INFO);
-int main ()
-{
-    PGNSI pGNSI;
-
-    pGNSI = (PGNSI) GetProcAddress(GetModuleHandle(TEXT("kernel32.dll")), "InitOnceExecuteOnce");
-
-    if (NULL == pGNSI)
-        return 1;
-    else
-        return 0;
-}
-
-#endif /* HAVE_IOEO */