Only build in crashdump support on Windows if there's a working dbghelp.h.

src/Makefile.global.in

@@ -363,6 +363,9 @@ ELF_SYSTEM= @ELF_SYS@
 # Backend stack size limit has to be hard-wired on Windows (it's in bytes)
 WIN32_STACK_RLIMIT=4194304
 
+# Set if we have a working win32 crashdump header
+have_win32_dbghelp = @have_win32_dbghelp@
+
 # Pull in platform-specific magic
 include $(top_builddir)/src/Makefile.port
 

src/backend/main/main.c

@@ -85,7 +85,7 @@ main(int argc, char *argv[])
 	 * If supported on the current platform, set up a handler to be called if
 	 * the backend/postmaster crashes with a fatal signal or exception.
 	 */
-#ifdef WIN32
+#if defined(WIN32) && defined(HAVE_MINIDUMP_TYPE)
 	pgwin32_install_crashdump_handler();
 #endif
 

src/backend/port/win32/Makefile

@@ -12,6 +12,9 @@ subdir = src/backend/port/win32
 top_builddir = ../../../..
 include $(top_builddir)/src/Makefile.global
 
-OBJS = timer.o socket.o signal.o security.o mingwcompat.o crashdump.o
+OBJS = timer.o socket.o signal.o security.o mingwcompat.o
+ifeq ($(have_win32_dbghelp), yes)
+OBJS += crashdump.o
+endif
 
 include $(top_srcdir)/src/backend/common.mk

src/include/pg_config.h.in

@@ -342,6 +342,9 @@
 /* Define to 1 if you have the <memory.h> header file. */
 #undef HAVE_MEMORY_H
 
+/* Define to 1 if the system has the type `MINIDUMP_TYPE'. */
+#undef HAVE_MINIDUMP_TYPE
+
 /* Define to 1 if you have the <netinet/in.h> header file. */
 #undef HAVE_NETINET_IN_H
 

src/include/pg_config.h.win32

@@ -258,6 +258,9 @@
 /* Define to 1 if you have the <memory.h> header file. */
 #define HAVE_MEMORY_H 1
 
+/* Define to 1 if the system has the type `MINIDUMP_TYPE'. */
+#define HAVE_MINIDUMP_TYPE 1
+
 /* Define to 1 if you have the <netinet/in.h> header file. */
 #define HAVE_NETINET_IN_H 1