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

configure

@@ -667,6 +667,7 @@ PTHREAD_CFLAGS
 PTHREAD_LIBS
 PTHREAD_CC
 acx_pthread_config
+have_win32_dbghelp
 HAVE_IPV6
 LIBOBJS
 OSSP_UUID_LIBS
@@ -20926,6 +20927,128 @@ cat >>confdefs.h <<\_ACEOF
 #define HAVE_SYMLINK 1
 _ACEOF
 
+  { $as_echo "$as_me:$LINENO: checking for MINIDUMP_TYPE" >&5
+$as_echo_n "checking for MINIDUMP_TYPE... " >&6; }
+if test "${ac_cv_type_MINIDUMP_TYPE+set}" = set; then
+  $as_echo_n "(cached) " >&6
+else
+  ac_cv_type_MINIDUMP_TYPE=no
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#include <string.h>
+#include <dbghelp.h>
+
+int
+main ()
+{
+if (sizeof (MINIDUMP_TYPE))
+       return 0;
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext
+if { (ac_try="$ac_compile"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
+$as_echo "$ac_try_echo") >&5
+  (eval "$ac_compile") 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && {
+	 test -z "$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       } && test -s conftest.$ac_objext; then
+  cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#include <string.h>
+#include <dbghelp.h>
+
+int
+main ()
+{
+if (sizeof ((MINIDUMP_TYPE)))
+	  return 0;
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext
+if { (ac_try="$ac_compile"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
+$as_echo "$ac_try_echo") >&5
+  (eval "$ac_compile") 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && {
+	 test -z "$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       } && test -s conftest.$ac_objext; then
+  :
+else
+  $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+	ac_cv_type_MINIDUMP_TYPE=yes
+fi
+
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+else
+  $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+
+fi
+
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+{ $as_echo "$as_me:$LINENO: result: $ac_cv_type_MINIDUMP_TYPE" >&5
+$as_echo "$ac_cv_type_MINIDUMP_TYPE" >&6; }
+if test "x$ac_cv_type_MINIDUMP_TYPE" = x""yes; then
+
+cat >>confdefs.h <<_ACEOF
+#define HAVE_MINIDUMP_TYPE 1
+_ACEOF
+
+pgac_minidump_type=yes
+else
+  pgac_minidump_type=no
+fi
+
+fi
+if test x"$pgac_minidump_type" = x"yes" ; then
+  have_win32_dbghelp=yes
+
+else
+  have_win32_dbghelp=no
+
 fi
 
 if test "$with_readline" = yes; then

configure.in

@@ -1350,6 +1350,16 @@ if test "$PORTNAME" = "win32"; then
   AC_LIBOBJ(win32error)
   AC_DEFINE([HAVE_SYMLINK], 1,
             [Define to 1 if you have the `symlink' function.])
+  AC_CHECK_TYPES(MINIDUMP_TYPE, [pgac_minidump_type=yes], [pgac_minidump_type=no], [
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#include <string.h>
+#include <dbghelp.h>])
+fi
+if test x"$pgac_minidump_type" = x"yes" ; then
+  AC_SUBST(have_win32_dbghelp,yes)
+else
+  AC_SUBST(have_win32_dbghelp,no)
 fi
 
 if test "$with_readline" = yes; then

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