7 files changed, 43 insertions, 5 deletions
diff --git a/src/include/c.h b/src/include/c.h
index 03918608464..cb9b150f8a6 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -58,7 +58,8 @@
 #endif
 #include "postgres_ext.h"
 
-#if _MSC_VER >= 1400 || defined(WIN64)
+#define HAVE_CRTDEFS_H 1
+#if _MSC_VER >= 1400 || defined(HAVE_CRTDEFS_H)
 #define errcode __msvc_errcode
 #include <crtdefs.h>
 #undef errcode
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index 15fe0bfff46..b969d8c8e6f 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -99,6 +99,9 @@
 /* Define to 1 if you have the `class' function. */
 #undef HAVE_CLASS
 
+/* Define to 1 if you have the <crtdefs.h> header file. */
+#undef HAVE_CRTDEFS_H
+
 /* Define to 1 if you have the `crypt' function. */
 #undef HAVE_CRYPT
 
diff --git a/src/include/port/win32.h b/src/include/port/win32.h
index 34f40041298..afc96283ebc 100644
--- a/src/include/port/win32.h
+++ b/src/include/port/win32.h
@@ -31,7 +31,7 @@
  * The Mingw64 headers choke if this is already defined - they
  * define it themselves.
  */
-#if !defined(WIN64) || defined(WIN32_ONLY_COMPILER)
+#if !defined(__MINGW64_VERSION_MAJOR) || defined(WIN32_ONLY_COMPILER)
 #define _WINSOCKAPI_
 #endif
 #include <winsock2.h>
@@ -225,9 +225,13 @@ int			setitimer(int which, const struct itimerval * value, struct itimerval * ov
 #define fseeko(stream, offset, origin) _fseeki64(stream, offset, origin)
 #define ftello(stream) _ftelli64(stream)
 #else
+#ifndef fseeko
 #define fseeko(stream, offset, origin) fseeko64(stream, offset, origin)
+#endif
+#ifndef ftello
 #define ftello(stream) ftello64(stream)
 #endif
+#endif
 
 /*
  * Supplement to <sys/types.h>.
@@ -264,16 +268,36 @@ typedef int pid_t;
 #undef EINTR
 #define EINTR WSAEINTR
 #define EAGAIN WSAEWOULDBLOCK
+#ifndef EMSGSIZE
 #define EMSGSIZE WSAEMSGSIZE
+#endif
+#ifndef EAFNOSUPPORT
 #define EAFNOSUPPORT WSAEAFNOSUPPORT
+#endif
+#ifndef EWOULDBLOCK
 #define EWOULDBLOCK WSAEWOULDBLOCK
+#endif
+#ifndef ECONNRESET
 #define ECONNRESET WSAECONNRESET
+#endif
+#ifndef EINPROGRESS
 #define EINPROGRESS WSAEINPROGRESS
+#endif
+#ifndef ENOBUFS
 #define ENOBUFS WSAENOBUFS
+#endif
+#ifndef EPROTONOSUPPORT
 #define EPROTONOSUPPORT WSAEPROTONOSUPPORT
+#endif
+#ifndef ECONNREFUSED
 #define ECONNREFUSED WSAECONNREFUSED
+#endif
+#ifndef EBADFD
 #define EBADFD WSAENOTSOCK
+#endif
+#ifndef EOPNOTSUPP
 #define EOPNOTSUPP WSAEOPNOTSUPP
+#endif
 
 /*
  * Extended locale functions with gratuitous underscore prefixes.
diff --git a/src/interfaces/ecpg/test/resultmap b/src/interfaces/ecpg/test/resultmap
index 95ea5831ccb..aef7338e819 100644
--- a/src/interfaces/ecpg/test/resultmap
+++ b/src/interfaces/ecpg/test/resultmap
@@ -1,9 +1,12 @@
 compat_informix/dec_test:stdout:i.86-pc-win32vc=compat_informix-dec_test-MinGW32.stdout
 compat_informix/dec_test:stdout:i.86-pc-mingw32=compat_informix-dec_test-MinGW32.stdout
 compat_informix/dec_test:stdout:x86_64-w64-mingw32=compat_informix-dec_test-MinGW32.stdout
+compat_informix/dec_test:stdout:i.86-w64-mingw32=compat_informix-dec_test-MinGW32.stdout
 pgtypeslib/num_test:stdout:i.86-pc-win32vc=pgtypeslib-num_test-MinGW32.stdout
 pgtypeslib/num_test:stdout:i.86-pc-mingw32=pgtypeslib-num_test-MinGW32.stdout
 pgtypeslib/num_test:stdout:x86_64-w64-mingw32=pgtypeslib-num_test-MinGW32.stdout
+pgtypeslib/num_test:stdout:i.86-w64-mingw32=pgtypeslib-num_test-MinGW32.stdout
 pgtypeslib/num_test2:stdout:i.86-pc-win32vc=pgtypeslib-num_test2-MinGW32.stdout
 pgtypeslib/num_test2:stdout:i.86-pc-mingw32=pgtypeslib-num_test2-MinGW32.stdout
 pgtypeslib/num_test2:stdout:x86_64-w64-mingw32=pgtypeslib-num_test2-MinGW32.stdout
+pgtypeslib/num_test2:stdout:i.86-w64-mingw32=pgtypeslib-num_test2-MinGW32.stdout
diff --git a/src/interfaces/libpq/win32.h b/src/interfaces/libpq/win32.h
index b65da9ada14..be00ea73cbb 100644
--- a/src/interfaces/libpq/win32.h
+++ b/src/interfaces/libpq/win32.h
@@ -22,9 +22,15 @@
 #undef EAGAIN					/* doesn't apply on sockets */
 #undef EINTR
 #define EINTR WSAEINTR
+#ifndef EWOULDBLOCK
 #define EWOULDBLOCK WSAEWOULDBLOCK
+#endif
+#ifndef ECONNRESET
 #define ECONNRESET WSAECONNRESET
+#endif
+#ifndef EINPROGRESS
 #define EINPROGRESS WSAEINPROGRESS
+#endif
 
 /*
  * support for handling Windows Socket errors
diff --git a/src/port/getaddrinfo.c b/src/port/getaddrinfo.c
index db19878ae14..b6368ae6916 100644
--- a/src/port/getaddrinfo.c
+++ b/src/port/getaddrinfo.c
@@ -328,12 +328,10 @@ gai_strerror(int errcode)
 		case EAI_MEMORY:
 			return "Not enough memory";
 #endif
-#ifdef EAI_NODATA
-#if !defined(WIN64) && !defined(WIN32_ONLY_COMPILER)	/* MSVC/WIN64 duplicate */
+#if defined(EAI_NODATA) && EAI_NODATA != EAI_NONAME /* MSVC/WIN64 duplicate */
 		case EAI_NODATA:
 			return "No host data of that type was found";
 #endif
-#endif
 #ifdef EAI_SERVICE
 		case EAI_SERVICE:
 			return "Class type not found";
diff --git a/src/test/regress/resultmap b/src/test/regress/resultmap
index d02d221d56f..04ba99fe338 100644
--- a/src/test/regress/resultmap
+++ b/src/test/regress/resultmap
@@ -1,5 +1,6 @@
 float4:out:i.86-pc-mingw32=float4-exp-three-digits.out
 float4:out:x86_64-w64-mingw32=float4-exp-three-digits.out
+float4:out:i.86-w64-mingw32=float4-exp-three-digits.out
 float4:out:i.86-pc-win32vc=float4-exp-three-digits.out
 float8:out:i.86-.*-freebsd=float8-small-is-zero.out
 float8:out:i.86-.*-openbsd=float8-small-is-zero.out
@@ -7,8 +8,10 @@ float8:out:i.86-.*-netbsd=float8-small-is-zero.out
 float8:out:m68k-.*-netbsd=float8-small-is-zero.out
 float8:out:i.86-pc-mingw32=float8-exp-three-digits-win32.out
 float8:out:x86_64-w64-mingw32=float8-exp-three-digits-win32.out
+float8:out:i.86-w64-mingw32=float8-exp-three-digits-win32.out
 float8:out:i.86-pc-win32vc=float8-exp-three-digits-win32.out
 float8:out:i.86-pc-cygwin=float8-small-is-zero.out
 int8:out:i.86-pc-mingw32=int8-exp-three-digits.out
 int8:out:x86_64-w64-mingw32=int8-exp-three-digits.out
+int8:out:i.86-w64-mingw32=int8-exp-three-digits.out
 int8:out:i.86-pc-win32vc=int8-exp-three-digits.out