Clean up/refactor the batch scripts used for building on Windows.

This is mostly a backport of issue #21907, but also includes a few
extras necessary to make the bulidbot scripts as thin as possible.
diff --git a/PCbuild/build.bat b/PCbuild/build.bat
index 03534f3..f3bc1e3 100644
--- a/PCbuild/build.bat
+++ b/PCbuild/build.bat
@@ -1,19 +1,107 @@
 @echo off

-rem A batch program to build or rebuild a particular configuration.

+rem A batch program to build or rebuild a particular configuration,

 rem just for convenience.

 

+rem Arguments:

+rem  -c  Set the configuration (default: Release)

+rem  -p  Set the platform (x64 or Win32, default: Win32)

+rem  -r  Target Rebuild instead of Build

+rem  -t  Set the target manually (Build, Rebuild, or Clean)

+rem  -d  Set the configuration to Debug

+rem  -e  Pull in external libraries using get_externals.bat

+rem  -m  Enable parallel build

+rem  -M  Disable parallel build (disabled by default)

+rem  -v  Increased output messages

+rem  -k  Attempt to kill any running Pythons before building

+

 setlocal

 set platf=Win32

+set vs_platf=x86

 set conf=Release

-set target=build

+set target=Build

 set dir=%~dp0

+set parallel=

+set verbose=/nologo /v:m

+set kill=

+set build_tkinter=

 

 :CheckOpts

-if "%1"=="-c" (set conf=%2) & shift & shift & goto CheckOpts

-if "%1"=="-p" (set platf=%2) & shift & shift & goto CheckOpts

-if "%1"=="-r" (set target=rebuild) & shift & goto CheckOpts

-if "%1"=="-d" (set conf=Debug) & shift & goto CheckOpts

+if '%1'=='-c' (set conf=%2) & shift & shift & goto CheckOpts

+if '%1'=='-p' (set platf=%2) & shift & shift & goto CheckOpts

+if '%1'=='-r' (set target=Rebuild) & shift & goto CheckOpts

+if '%1'=='-t' (set target=%2) & shift & shift & goto CheckOpts

+if '%1'=='-d' (set conf=Debug) & shift & goto CheckOpts

+if '%1'=='-e' call "%dir%get_externals.bat" & (set build_tkinter=true) & shift & goto CheckOpts

+if '%1'=='-m' (set parallel=/m) & shift & goto CheckOpts

+if '%1'=='-M' (set parallel=) & shift & goto CheckOpts

+if '%1'=='-v' (set verbose=/v:n) & shift & goto CheckOpts

+if '%1'=='-k' (set kill=true) & shift & goto CheckOpts

 

-set cmd=msbuild /p:useenv=true %dir%pcbuild.sln /t:%target% /p:Configuration=%conf% /p:Platform=%platf%

-echo %cmd%

-%cmd%

+if '%conf%'=='Debug' (set dbg_ext=_d) else (set dbg_ext=)

+if '%platf%'=='x64' (

+    set vs_platf=x86_amd64

+    set builddir=%dir%amd64\

+) else (

+    set builddir=%dir%

+)

+

+rem Setup the environment

+call "%dir%env.bat" %vs_platf%

+

+if '%kill%'=='true' (

+    msbuild "%dir%kill_python.vcxproj" %verbose% /p:Configuration=%conf% /p:Platform=%platf% && "%builddir%kill_python%dbg_ext%.exe"

+)

+

+set externals_dir=%dir%..\externals

+if '%build_tkinter%'=='true' (

+    if '%platf%'=='x64' (

+        set tcltkdir=%externals_dir%\tcltk64

+        set machine=AMD64

+    ) else (

+        set tcltkdir=%externals_dir%\tcltk

+        set machine=IX86

+    )

+    if '%conf%'=='Debug' (

+        set tcl_dbg_ext=g

+        set debug_flag=1

+        set options=symbols

+    ) else (

+        set tcl_dbg_ext=

+        set debug_flag=0

+        set options=

+    )

+    set tcldir=%externals_dir%\tcl-8.6.1.0

+    set tkdir=%externals_dir%\tk-8.6.1.0

+    set tixdir=%externals_dir%\tix-8.4.3.4

+)

+if '%build_tkinter%'=='true' (

+    if not exist "%tcltkdir%\bin\tcl86t%tcl_dbg_ext%.dll" (

+        @rem all and install need to be separate invocations, otherwise nmakehlp is not found on install

+        pushd "%tcldir%\win"

+        nmake -f makefile.vc MACHINE=%machine% OPTS=%options% INSTALLDIR="%tcltkdir%" clean all

+        nmake -f makefile.vc MACHINE=%machine% OPTS=%options% INSTALLDIR="%tcltkdir%" install-binaries install-libraries

+        popd

+    )

+

+    if not exist "%tcltkdir%\bin\tk86t%tcl_dbg_ext%.dll" (

+        pushd "%tkdir%\win"

+        nmake -f makefile.vc MACHINE=%machine% OPTS=%options% INSTALLDIR="%tcltkdir%" TCLDIR="%tcldir%" clean

+        nmake -f makefile.vc MACHINE=%machine% OPTS=%options% INSTALLDIR="%tcltkdir%" TCLDIR="%tcldir%" all

+        nmake -f makefile.vc MACHINE=%machine% OPTS=%options% INSTALLDIR="%tcltkdir%" TCLDIR="%tcldir%" install-binaries install-libraries

+        popd

+    )

+

+    if not exist "%tcltkdir%\lib\tix8.4.3\tix84%tcl_dbg_ext%.dll" (

+        pushd "%tixdir%\win"

+        nmake -f python.mak DEBUG=%debug_flag% MACHINE=%machine% TCL_DIR="%tcldir%" TK_DIR="%tkdir%" INSTALL_DIR="%tcltkdir%" clean

+        nmake -f python.mak DEBUG=%debug_flag% MACHINE=%machine% TCL_DIR="%tcldir%" TK_DIR="%tkdir%" INSTALL_DIR="%tcltkdir%" all

+        nmake -f python.mak DEBUG=%debug_flag% MACHINE=%machine% TCL_DIR="%tcldir%" TK_DIR="%tkdir%" INSTALL_DIR="%tcltkdir%" install

+        popd

+    )

+)

+

+rem Call on MSBuild to do the work, echo the command.

+rem Passing %1-9 is not the preferred option, but argument parsing in

+rem batch is, shall we say, "lackluster"

+echo on

+msbuild "%dir%pcbuild.sln" /t:%target% %parallel% %verbose% /p:Configuration=%conf% /p:Platform=%platf% %1 %2 %3 %4 %5 %6 %7 %8 %9