@rem
@rem Searches for MSBuild.exe. This is the only tool we need to initiate
@rem a build, so we no longer search for the full VC toolset.
@rem
@rem This file is supposed to modify the state of the caller (specifically
@rem the MSBUILD variable), so we do not use setlocal or echo, and avoid
@rem changing any other persistent state.
@rem

@rem No arguments provided means do full search
@if '%1' EQU '' goto :begin_search

@rem One argument may be the full path. Use a goto so we don't try to
@rem parse the next if statement - incorrect quoting in the multi-arg
@rem case can cause us to break immediately.
@if '%2' EQU '' goto :one_arg

@rem Entire command line may represent the full path if quoting failed.
@if exist "%*" (set MSBUILD="%*") & (set _Py_MSBuild_Source=environment) & goto :found
@goto :begin_search

:one_arg
@if exist "%~1" (set MSBUILD="%~1") & (set _Py_MSBuild_Source=environment) & goto :found

:begin_search
@set MSBUILD=

@rem If msbuild.exe is on the PATH, assume that the user wants that one.
@msbuild /version > nul 2>&1
@if NOT ERRORLEVEL 9009 set MSBUILD=msbuild & (set _Py_MSBuild_Source=PATH) & goto :found

@rem VS 2015 and earlier register MSBuild separately, so we can find it.
@rem Prefer MSBuild 14.0 over MSBuild 15.0, since the latter may not be able to find a VC14 install.
@reg query "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSBuild\ToolsVersions\14.0" /v MSBuildToolsPath /reg:32 >nul 2>nul
@if NOT ERRORLEVEL 1 @for /F "tokens=1,2*" %%i in ('reg query "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSBuild\ToolsVersions\14.0" /v MSBuildToolsPath /reg:32') DO @(
    @if "%%i"=="MSBuildToolsPath" @if exist "%%k\msbuild.exe" @(set MSBUILD="%%k\msbuild.exe")
)
@if exist %MSBUILD% (set _Py_MSBuild_Source=registry) & goto :found

@rem VS 2017 sets exactly one install as the "main" install, so we may find MSBuild in there.
@reg query "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\SxS\VS7" /v 15.0 /reg:32 >nul 2>nul
@if NOT ERRORLEVEL 1 @for /F "tokens=1,2*" %%i in ('reg query "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\SxS\VS7" /v 15.0 /reg:32') DO @(
    @if "%%i"=="15.0" @if exist "%%k\MSBuild\15.0\Bin\msbuild.exe" @(set MSBUILD="%%k\MSBuild\15.0\Bin\msbuild.exe")
)
@if exist %MSBUILD% (set _Py_MSBuild_Source=Visual Studio 2017 registry) & goto :found


@exit /b 1

:found
@echo Using %MSBUILD% (found in the %_Py_MSBuild_Source%)
@set _Py_MSBuild_Source=