Change the behavior of exporting/importing symbols on Windows, so that to fit the new build procedure, i.e. import statically linked opal/orte libraries for other libraries/binaries. There are several use cases when creating dll libraries:

1. create DLL A, export symbols of A, import nothing  (A normally is OPAL)
   should define _USRDLL , A_EXPORT 

2. create DLL B, export symbols of B, import A.lib    (B could be ORTE, OMPI or other ompi tools)
   should define _USRDLL, B_EXPORT

3. create DLL C, import B.dll    (C could be external libs or apps)
   should define B_IMPORT

This commit was SVN r24016.

ompi/include/ompi_config.h.in

@@ -86,7 +86,11 @@ typedef struct {
 #      define OMPI_DECLSPEC        __declspec(dllexport)
 #      define OMPI_MODULE_DECLSPEC
 #    else
-#      define OMPI_DECLSPEC        __declspec(dllimport)
+#      if defined(OMPI_IMPORTS)
+#        define OMPI_DECLSPEC      __declspec(dllimport)
+#      else
+#        define OMPI_DECLSPEC
+#      endif  /*defined(OMPI_IMPORTS)*/
 #      if defined(OMPI_MODULE_EXPORTS)
 #        define OMPI_MODULE_DECLSPEC __declspec(dllexport)
 #      else

opal/include/opal_config_bottom.h

@@ -240,7 +240,11 @@
 #      define OPAL_DECLSPEC        __declspec(dllexport)
 #      define OPAL_MODULE_DECLSPEC
 #    else
-#      define OPAL_DECLSPEC
+#      if defined(OPAL_IMPORTS)
+#        define OPAL_DECLSPEC      __declspec(dllimport)
+#      else
+#        define OPAL_DECLSPEC
+#      endif  /*defined(OPAL_IMPORTS)*/
 #      if defined(OPAL_MODULE_EXPORTS)
 #        define OPAL_MODULE_DECLSPEC __declspec(dllexport)
 #      else

orte/include/orte_config.h.in

@@ -35,7 +35,11 @@
 #      define ORTE_DECLSPEC         __declspec(dllexport)
 #      define ORTE_MODULE_DECLSPEC
 #    else
-#      define ORTE_DECLSPEC         __declspec(dllimport)
+#      if defined(ORTE_IMPORTS)
+#        define ORTE_DECLSPEC       __declspec(dllimport)
+#      else
+#        define ORTE_DECLSPEC
+#      endif  /*defined(ORTE_IMPORTS)*/
 #      if defined(ORTE_MODULE_EXPORTS)
 #        define ORTE_MODULE_DECLSPEC __declspec(dllexport)
 #      else