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+@ECHO OFF
+REM ================================================================
+REM You can use either GCC (the default) or MSVC to build git
+REM using the GIT-SDK command line tools.
+REM $ make
+REM $ make MSVC=1
+REM
+REM GIT-SDK BASH windows inherit environment variables with all of
+REM the bin/lib/include paths for GCC. It DOES NOT inherit values
+REM for the corresponding MSVC tools.
+REM
+REM During normal (non-git) Windows development, you launch one
+REM of the provided "developer command prompts" to set environment
+REM variables for the MSVC tools.
+REM
+REM Therefore, to allow MSVC command line builds of git from BASH
+REM and MAKE, we must blend these two different worlds. This script
+REM attempts to do that.
+REM ================================================================
+REM This BAT file starts in a plain (non-developer) command prompt,
+REM searches for the "best" commmand prompt setup script, installs
+REM it into the current CMD process, and exports the various MSVC
+REM environment variables for use by MAKE.
+REM
+REM The output of this script should be written to a make "include
+REM file" and referenced by the top-level Makefile.
+REM
+REM See "config.mak.uname" (look for compat/vcbuild/MSVC-DEFS-GEN).
+REM ================================================================
+REM The provided command prompts are custom to each VS release and
+REM filled with lots of internal knowledge (such as Registry settings);
+REM even their names vary by release, so it is not appropriate for us
+REM to look inside them. Rather, just run them in a subordinate
+REM process and extract the settings we need.
+REM ================================================================
+REM
+REM Current (VS2017 and beyond)
+REM -------------------
+REM Visual Studio 2017 introduced a new installation layout and
+REM support for side-by-side installation of multiple versions of
+REM VS2017. Furthermore, these can all coexist with installations
+REM of previous versions of VS (which have a completely different
+REM layout on disk).
+REM
+REM VS2017 Update 2 introduced a "vswhere.exe" command:
+REM https://github.com/Microsoft/vswhere
+REM https://blogs.msdn.microsoft.com/heaths/2017/02/25/vswhere-available/
+REM https://blogs.msdn.microsoft.com/vcblog/2017/03/06/finding-the-visual-c-compiler-tools-in-visual-studio-2017/
+REM
+REM VS2015
+REM ------
+REM Visual Studio 2015 uses the traditional VcVarsAll.
+REM
+REM Earlier Versions
+REM ----------------
+REM Currently unsupported.
+REM
+REM ================================================================
+REM Note: Throughout this script we use "dir <path> && <cmd>" rather
+REM than "if exist <path>" because of script problems with pathnames
+REM containing spaces.
+REM ================================================================
+
+REM Sanitize PATH to prevent git-sdk paths from confusing "wmic.exe"
+REM (called internally in some of the system BAT files).
+SET PATH=%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;
+
+REM ================================================================
+
+:current
+ SET vs_where=C:\Program Files (x86)\Microsoft Visual Studio\Installer\vswhere.exe
+ dir "%vs_where%" >nul 2>nul && GOTO have_vs_where
+ GOTO not_2017
+
+:have_vs_where
+ REM Try to use VsWhere to get the location of VsDevCmd.
+
+ REM Keep VsDevCmd from cd'ing away.
+ SET VSCMD_START_DIR=.
+
+ REM Get the root of the VS product installation.
+ FOR /F "usebackq tokens=*" %%i IN (`"%vs_where%" -latest -requires Microsoft.VisualStudio.Workload.NativeDesktop -property installationPath`) DO @SET vs_ip=%%i
+
+ SET vs_devcmd=%vs_ip%\Common7\Tools\VsDevCmd.bat
+ dir "%vs_devcmd%" >nul 2>nul && GOTO have_vs_devcmd
+ GOTO not_2017
+
+:have_vs_devcmd
+ REM Use VsDevCmd to setup the environment of this process.
+ REM Setup CL for building 64-bit apps using 64-bit tools.
+ @call "%vs_devcmd%" -no_logo -arch=x64 -host_arch=x64
+
+ SET tgt=%VSCMD_ARG_TGT_ARCH%
+
+ SET mn=%VCToolsInstallDir%
+ SET msvc_includes=-I"%mn%INCLUDE"
+ SET msvc_libs=-L"%mn%lib\%tgt%"
+ SET msvc_bin_dir=%mn%bin\Host%VSCMD_ARG_HOST_ARCH%\%tgt%
+
+ SET sdk_dir=%WindowsSdkDir%
+ SET sdk_ver=%WindowsSDKVersion%
+ SET si=%sdk_dir%Include\%sdk_ver%
+ SET sdk_includes=-I"%si%ucrt" -I"%si%um" -I"%si%shared"
+ SET sl=%sdk_dir%lib\%sdk_ver%
+ SET sdk_libs=-L"%sl%ucrt\%tgt%" -L"%sl%um\%tgt%"
+
+ SET vs_ver=%VisualStudioVersion%
+
+ GOTO print_vars
+
+REM ================================================================
+
+:not_2017
+ REM See if VS2015 is installed.
+
+ SET vs_2015_bat=C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\vcvarsall.bat
+ dir "%vs_2015_bat%" >nul 2>nul && GOTO have_vs_2015
+ GOTO not_2015
+
+:have_vs_2015
+ REM Use VcVarsAll like the "x64 Native" command prompt.
+ REM Setup CL for building 64-bit apps using 64-bit tools.
+ @call "%vs_2015_bat%" amd64
+
+ REM Note that in VS2015 they use "x64" in some contexts and "amd64" in others.
+ SET mn=C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\
+ SET msvc_includes=-I"%mn%INCLUDE"
+ SET msvc_libs=-L"%mn%lib\amd64"
+ SET msvc_bin_dir=%mn%bin\amd64
+
+ SET sdk_dir=%WindowsSdkDir%
+ SET sdk_ver=%WindowsSDKVersion%
+ SET si=%sdk_dir%Include\%sdk_ver%
+ SET sdk_includes=-I"%si%ucrt" -I"%si%um" -I"%si%shared" -I"%si%winrt"
+ SET sl=%sdk_dir%lib\%sdk_ver%
+ SET sdk_libs=-L"%sl%ucrt\x64" -L"%sl%um\x64"
+
+ SET vs_ver=%VisualStudioVersion%
+
+ GOTO print_vars
+
+REM ================================================================
+
+:not_2015
+ echo "ERROR: unsupported VS version (older than VS2015)" >&2
+ EXIT /B 1
+
+REM ================================================================
+
+:print_vars
+ REM Dump the essential vars to stdout to allow the main
+ REM Makefile to include it. See config.mak.uname.
+ REM Include DOS-style and BASH-style path for bin dir.
+
+ echo msvc_bin_dir=%msvc_bin_dir%
+ SET X1=%msvc_bin_dir:C:=/C%
+ SET X2=%X1:\=/%
+ echo msvc_bin_dir_msys=%X2%
+
+ echo msvc_includes=%msvc_includes%
+ echo msvc_libs=%msvc_libs%
+
+ echo sdk_includes=%sdk_includes%
+ echo sdk_libs=%sdk_libs%
+
+ echo vs_ver=%vs_ver%
+
+ EXIT /B 0