Improve STRINGS_H macro test for MSVC extensions.

Add DLLIMPORT for V1 headers, in case Win32 don't export all symbols.

Author: bmomjian

src/include/c.h

@@ -12,7 +12,7 @@
  * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/c.h,v 1.197 2006/03/03 21:35:46 momjian Exp $
+ * $PostgreSQL: pgsql/src/include/c.h,v 1.198 2006/03/05 04:43:57 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -57,6 +57,8 @@
 #else
 #if defined(_MSC_VER) || defined(__BORLANDC__)
 #define WIN32_CLIENT_ONLY
+/* Some use MinGW-generated pg_config.h but MSVC for extensions. */
+#undef HAVE_STRINGS_H
 #endif
 #endif
 #include "postgres_ext.h"
@@ -66,8 +68,7 @@
 #include <string.h>
 #include <stddef.h>
 #include <stdarg.h>
-/* Some use MinGW-generated pg_config.h but MSVC for extensions. */
-#if defined(HAVE_STRINGS_H) && !defined(WIN32_CLIENT_ONLY)
+#ifdef HAVE_STRINGS_H
 #include <strings.h>
 #endif
 #include <sys/types.h>

src/include/fmgr.h

@@ -11,7 +11,7 @@
  * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/fmgr.h,v 1.40 2005/10/15 02:49:41 momjian Exp $
+ * $PostgreSQL: pgsql/src/include/fmgr.h,v 1.41 2006/03/05 04:43:57 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -293,10 +293,13 @@ typedef struct
 /* Expected signature of an info function */
 typedef Pg_finfo_record *(*PGFInfoFunction) (void);
 
-/* Macro to build an info function associated with the given function name */
-
+/*
+ *	Macro to build an info function associated with the given function name.
+ *	Win32 loadable functions usually link with 'dlltool --export-all', but it
+ *	doesn't hurt to add DLLIMPORT in case they don't.
+ */
 #define PG_FUNCTION_INFO_V1(funcname) \
-extern Pg_finfo_record * CppConcat(pg_finfo_,funcname) (void); \
+extern DLLIMPORT Pg_finfo_record * CppConcat(pg_finfo_,funcname) (void); \
 Pg_finfo_record * \
 CppConcat(pg_finfo_,funcname) (void) \
 { \