patch 7.4.1031

Problem:    Can't build with Python interface using MingW.
Solution:   Update the Makefile. (Yasuhiro Matsumoto)

src/INSTALLpc.txt

@@ -232,6 +232,10 @@ or you can use 'MinGW-w64' compiler.
 
     http://mingw-w64.sourceforge.net/
 
+Or a compiler provided on msys2:
+
+    https://msys2.github.io/
+
 Once you have downloaded the compiler binaries, unpack them on your hard disk
 somewhere, and put them on your PATH.  If you are on Win95/98 you can edit
 your AUTOEXEC.BAT file with a line like:
@@ -239,7 +243,14 @@ your AUTOEXEC.BAT file with a line like:
     set PATH=C:\MinGW\bin;%PATH%
 
 or on NT/2000/XP, go to the Control Panel, (Performance and Maintenance),
-System, Advanced, and edit the environment from there.
+System, Advanced, and edit the environment from there. If you use msys2
+compilers, set your installed paths:
+
+    C:\msys2\mingw32\bin
+
+for 32bit. And 64bit:
+
+    C:\msys2\mingw64\bin
 
 Test if gcc is on your path.  From a CMD (or COMMAND on '95/98) window:
 
@@ -341,21 +352,32 @@ Building with the mingw32 compiler, and the ActiveState ActivePython:
 
 After installing the ActivePython, you will have to create a 'mingw32'
 'libpython20.a' to link with:
-   cd $PYTHON/libs
-   pexports python20.dll > python20.def
-   dlltool -d python20.def -l libpython20.a
+    cd $PYTHON/libs
+    pexports python20.dll > python20.def
+    dlltool -d python20.def -l libpython20.a
 
 Once that is done, edit the 'Make_ming.mak' so the PYTHON variable points to
 the root of the Python installation (C:\Python20, for example).  If you are
 cross-compiling on Linux with the mingw32 setup, you need to also convert all
 the 'Include' files to *unix* line-endings.  This bash command will do it
 easily:
-   for fil in *.h ; do vim -e -c 'set ff=unix|w|q' $fil
+    for fil in *.h ; do vim -e -c 'set ff=unix|w|q' $fil
 
 Now just do:
-   make -f Make_ming.mak gvim.exe
+    make -f Make_ming.mak gvim.exe
 
-and you will end up with a Python-enabled, Win32 version.  Enjoy!
+And if you use msys2 to build python support (as one line):
+
+    mingw32-make -f Make_ming.mak PYTHON=c:/msys64/mingw64
+        PYTHON_HOME=c:/msys64/mingw64
+        PYTHONINC=-Ic:/msys64/mingw64/include/python2.7
+        DYNAMIC_PYTHON=yes
+        PYTHON_VER=27
+        DYNAMIC_PYTHON_DLL=libpython2.7.dll
+        ARCH=x86-64
+        STATIC_STDCPLUS=yes
+
+You will end up with a Python-enabled, Win32 version. Enjoy!
 
 
 7. Building with MzScheme support

src/Make_cyg_ming.mak

@@ -212,7 +212,13 @@ DYNAMIC_PYTHON=yes
 endif
 
 ifndef PYTHON_VER
-PYTHON_VER=22
+PYTHON_VER=27
+endif
+ifndef DYNAMIC_PYTHON_DLL
+DYNAMIC_PYTHON_DLL=python$(PYTHON_VER).dll
+endif
+ifdef PYTHON_HOME
+PYTHON_HOME_DEF=-DPYTHON_HOME=\"$(PYTHON_HOME)\"
 endif
 
 ifeq (no,$(DYNAMIC_PYTHON))
@@ -220,12 +226,14 @@ PYTHONLIB=-L$(PYTHON)/libs -lpython$(PYTHON_VER)
 endif
 # my include files are in 'win32inc' on Linux, and 'include' in the standard
 # NT distro (ActiveState)
+ifndef PYTHONINC
 ifeq ($(CROSS),no)
 PYTHONINC=-I $(PYTHON)/include
 else
 PYTHONINC=-I $(PYTHON)/win32inc
 endif
 endif
+endif
 
 #	Python3 interface:
 #	  PYTHON3=[Path to Python3 directory] (Set inside Make_cyg.mak or Make_ming.mak)
@@ -772,7 +780,7 @@ INCL = vim.h feature.h os_win32.h os_dos.h ascii.h keymap.h term.h macros.h \
 	gui.h
 
 $(OUTDIR)/if_python.o : if_python.c if_py_both.h $(INCL)
-	$(CC) -c $(CFLAGS) $(PYTHONINC) -DDYNAMIC_PYTHON_DLL=\"python$(PYTHON_VER).dll\" $< -o $@
+	$(CC) -c $(CFLAGS) $(PYTHONINC) $(PYTHON_HOME_DEF) -DDYNAMIC_PYTHON_DLL=\"$(DYNAMIC_PYTHON_DLL)\" $< -o $@
 
 $(OUTDIR)/if_python3.o : if_python3.c if_py_both.h $(INCL)
 	$(CC) -c $(CFLAGS) $(PYTHON3INC) -DDYNAMIC_PYTHON3_DLL=\"PYTHON$(PYTHON3_VER).dll\" $< -o $@

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1031,
 /**/
     1030,
 /**/