Enable compiling with the mingw-w64 32 bit compiler.

Original patch by Lars Kanis, reviewed by Nishiyama Tomoaki and tweaked some by me.

This compiler, or at least the latest version of it, is currently broken, and
only passes the regression tests if built with -O0.

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

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
 

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.

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

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

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";

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