Hi, I built Vim in Windows and found below error message.

% mingw32-make.exe -f Make_ming.mak GUI=yes IME=yes MBYTE=yes ICONV=yes DEBUG=no
E:/MinGW/bin/mingw32-make.exe -C xxd -f Make_cyg.mak CC=gcc
mingw32-make.exe[1]: Entering directory `H:/Work/vim/src/xxd'
gcc -O2 -Wall -DWIN32 -mno-cygwin -s -o xxd.exe xxd.c

This behavior is : xxd(and GVimExt) is using -mno-cygwin option in
MinGW environment.
But, MinGW gcc(ver.4.6 or above) is deleted -mno-cygwin option.
http://lists.gnu.org/archive/html/mingw-cross-env-list/2011-03/msg00119.html
So appeared error message.

I made this patch, and error message doesn't appear.

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diff -r 5e84f6567623 -r a47d6e9f6be1 src/GvimExt/Make_ming.mak
--- a/src/GvimExt/Make_ming.mak	Wed Sep 21 20:09:42 2011 +0200
+++ b/src/GvimExt/Make_ming.mak	Sat Sep 24 00:15:07 2011 +0900
@@ -1,6 +1,6 @@
 # Project: gvimext
 # Generates gvimext.dll with gcc.
-# Can be used for Cygwin and MingW (MingW ignores -mno-cygwin)
+# Can be used for Cygwin and MingW (MingW doesn't ignore -mno-cygwin)
 #
 # Originally, the DLL base address was fixed: -Wl,--image-base=0x1C000000
 # Now it is allocated dymanically by the linker by evaluating all DLLs
@@ -31,12 +31,12 @@
 ifeq ($(CROSS),yes)
 DEL = rm
 ifeq ($(MINGWOLD),yes)
-CXXFLAGS := -O2 -mno-cygwin -fvtable-thunks
+CXXFLAGS := -O2 -fvtable-thunks
 else
-CXXFLAGS := -O2 -mno-cygwin
+CXXFLAGS := -O2
 endif
 else
-CXXFLAGS := -O2 -mno-cygwin
+CXXFLAGS := -O2
 ifneq (sh.exe, $(SHELL))
 DEL = rm
 else
diff -r 5e84f6567623 -r a47d6e9f6be1 src/Make_cyg.mak
--- a/src/Make_cyg.mak	Wed Sep 21 20:09:42 2011 +0200
+++ b/src/Make_cyg.mak	Sat Sep 24 00:15:07 2011 +0900
@@ -536,7 +536,7 @@
 	$(MAKE) -C xxd -f Make_cyg.mak CC=$(CC) USEDLL=$(USEDLL)
 
 GvimExt/gvimext.dll: GvimExt/gvimext.cpp GvimExt/gvimext.rc GvimExt/gvimext.h
-	$(MAKE) -C GvimExt -f Make_ming.mak CROSS_COMPILE=$(CROSS_COMPILE)
+	$(MAKE) -C GvimExt -f Make_cyg.mak CROSS_COMPILE=$(CROSS_COMPILE)
 
 vimrun.exe: vimrun.c
 	$(CC) $(CFLAGS) -o vimrun.exe vimrun.c  $(LIBS)
@@ -565,7 +565,7 @@
 endif
 	-$(DEL) pathdef.c
 	$(MAKE) -C xxd -f Make_cyg.mak clean
-	$(MAKE) -C GvimExt -f Make_ming.mak clean
+	$(MAKE) -C GvimExt -f Make_cyg.mak clean
 
 distclean: clean
 	-$(DEL) obj$(DIRSLASH)*.o
diff -r 5e84f6567623 -r a47d6e9f6be1 src/Make_ming.mak
--- a/src/Make_ming.mak	Wed Sep 21 20:09:42 2011 +0200
+++ b/src/Make_ming.mak	Sat Sep 24 00:15:07 2011 +0900
@@ -641,7 +641,7 @@
 	upx vim.exe
 
 xxd/xxd.exe: xxd/xxd.c
-	$(MAKE) -C xxd -f Make_cyg.mak CC=$(CC)
+	$(MAKE) -C xxd -f Make_ming.mak CC=$(CC)
 
 GvimExt/gvimext.dll: GvimExt/gvimext.cpp GvimExt/gvimext.rc GvimExt/gvimext.h
 	$(MAKE) -C GvimExt -f Make_ming.mak CROSS=$(CROSS) CROSS_COMPILE=$(CROSS_COMPILE)
@@ -659,7 +659,7 @@
 	-$(DEL) mzscheme_base.c
 endif
 	$(MAKE) -C GvimExt -f Make_ming.mak clean
-	$(MAKE) -C xxd -f Make_cyg.mak clean
+	$(MAKE) -C xxd -f Make_ming.mak clean
 
 ###########################################################################
 INCL = vim.h feature.h os_win32.h os_dos.h ascii.h keymap.h term.h macros.h \
diff -r 5e84f6567623 -r a47d6e9f6be1 src/xxd/Make_ming.mak
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/xxd/Make_ming.mak	Sat Sep 24 00:15:07 2011 +0900
@@ -0,0 +1,28 @@
+# The most simplistic Makefile, for MinGW gcc on MS-DOS
+
+ifndef USEDLL
+USEDLL = no
+endif
+
+ifeq (yes, $(USEDLL))
+DEFINES =
+LIBS    = -lc
+else
+DEFINES =
+LIBS    =
+endif
+
+CC = gcc
+CFLAGS = -O2 -Wall -DWIN32 $(DEFINES)
+
+ifneq (sh.exe, $(SHELL))
+DEL = rm
+else
+DEL = del
+endif
+
+xxd.exe: xxd.c
+	$(CC) $(CFLAGS) -s -o xxd.exe xxd.c $(LIBS)
+
+clean:
+	-$(DEL) xxd.exe

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