Merge pull request #95 from FileOnQ/features/8-additional-vs-version-…

…support

automate finding vcvarsall to support more vs versions

build/libheif.bat

@@ -3,7 +3,52 @@ title Building libheif
 set arch=%1
 set config=%2
 set thirdPartyPath=%3
-call "C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Auxiliary\Build\vcvarsall.bat" %arch%
+set vcvar=
+set progFile=
+
+
+::check default 
+set vswhereFile="%ProgramFiles%\Microsoft Visual Studio\Installer\vswhere.exe"
+if exist %vswhereFile% (	
+	goto setprogfile
+)
+goto check86
+
+
+
+:setprogfile
+set progFile=%ProgramFiles%
+goto vswhereFound
+
+
+
+:check86
+set vswhereFile86="%ProgramFiles(x86)%\Microsoft Visual Studio\Installer\vswhere.exe"
+if exist "%vswhereFile86%" (
+	set progFile=%vswhereFile86%
+	goto vswhereFound
+)
+goto fileNotFound
+
+
+
+:vswhereFound
+set vcvar=
+for /f "usebackq tokens=1 delims=" %%x in (`%progFile% -find **\vcvarsall.bat`) do set vcvar="%%~x"
+if defined vcvar goto fileFound
+
+
+
+:fileNotFound
+echo "unable to find 'vcvarsall.bat'. visual studio c++ package needs to be installed"
+exit /b 2
+
+
+
+:fileFound
+echo "vcvarsall.bat was found, continuing"
+
+call %vcvar% %arch%
 cd ../third-party/libheif-%arch%
 
 mkdir build