Add an option for enabling/disabling the compatible support for windows xp. For example, the InterlockedCompareExchange64 support, which doesn't exist on XP. Enabling this option can make sure that the binary built on a Windows 7/Vista could also be run on Windows XP correctly.

This commit was SVN r25724.

contrib/platform/win32/CMakeModules/ompi_check_Microsoft.cmake

@@ -151,11 +151,15 @@ IF(NOT MICROSOFT_CHECK_DONE)
     # exported by kernel32.dll. If we force the usage of TRY_RUN
     # here we will check for both in same time: compilation and run.
 
-    IF(${CMAKE_SYSTEM_VERSION} GREATER 5.1)
-      SET(FUNCTION_LIST Exchange ExchangeAcquire ExchangeRelease Exchange64)
-    ELSE(${CMAKE_SYSTEM_VERSION} GREATER 5.1)
+	IF(OMPI_WANT_XP_COMPATIBLE)
       SET(FUNCTION_LIST Exchange ExchangeAcquire ExchangeRelease)
-    ENDIF(${CMAKE_SYSTEM_VERSION} GREATER 5.1)
+	ELSE(OMPI_WANT_XP_COMPATIBLE)
+      IF(${CMAKE_SYSTEM_VERSION} GREATER 5.1)
+        SET(FUNCTION_LIST Exchange ExchangeAcquire ExchangeRelease Exchange64)
+      ELSE(${CMAKE_SYSTEM_VERSION} GREATER 5.1)
+        SET(FUNCTION_LIST Exchange ExchangeAcquire ExchangeRelease)
+      ENDIF(${CMAKE_SYSTEM_VERSION} GREATER 5.1)
+	ENDIF((OMPI_WANT_XP_COMPATIBLE))
 
     FOREACH(FUNCTION ${FUNCTION_LIST})
       MESSAGE( STATUS "Checking for InterlockedCompare${FUNCTION}...")

contrib/platform/win32/CMakeModules/ompi_check_MinGW.cmake

@@ -95,11 +95,15 @@ IF(NOT MINGW_CHECK_DONE)
     # exported by kernel32.dll. If we force the usage of TRY_RUN
     # here we will check for both in same time: compilation and run.
 
-    #IF(${CMAKE_SYSTEM_VERSION} GREATER 5.1)
-      SET(FUNCTION_LIST Exchange ExchangeAcquire ExchangeRelease Exchange64)
-    #ELSE(${CMAKE_SYSTEM_VERSION} GREATER 5.1)
-    #  SET(FUNCTION_LIST Exchange ExchangeAcquire ExchangeRelease)
-    #ENDIF(${CMAKE_SYSTEM_VERSION} GREATER 5.1)
+    IF(OMPI_WANT_XP_COMPATIBLE)
+      SET(FUNCTION_LIST Exchange ExchangeAcquire ExchangeRelease)
+    ELSE(OMPI_WANT_XP_COMPATIBLE)
+      IF(${CMAKE_SYSTEM_VERSION} GREATER 5.1)
+        SET(FUNCTION_LIST Exchange ExchangeAcquire ExchangeRelease Exchange64)
+      ELSE(${CMAKE_SYSTEM_VERSION} GREATER 5.1)
+        SET(FUNCTION_LIST Exchange ExchangeAcquire ExchangeRelease)
+      ENDIF(${CMAKE_SYSTEM_VERSION} GREATER 5.1)
+    ENDIF((OMPI_WANT_XP_COMPATIBLE))
 
     FOREACH(FUNCTION ${FUNCTION_LIST})
       MESSAGE( STATUS "Checking for InterlockedCompare${FUNCTION}...")

contrib/platform/win32/CMakeModules/ompi_configure.cmake

@@ -253,6 +253,8 @@ OMPI_DEF_OPT(OPAL_EVENT_HAVE_THREAD_SUPPORT "Whether we want to enable event lib
 
 OMPI_DEF_OPT(OMPI_RELEASE_BUILD "Whether it is a build for binary release (this will skip the path settings in mca_installdirs_config)." OFF)
 
+OMPI_DEF_OPT(OMPI_WANT_XP_COMPATIBLE "Whether we want to build with Windows XP compatible functions (with InterlockedCompareExchange64 suooprt)." ON)
+
 IF (NOT MSVC)
 
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