wip review comments

frontend.bat

@@ -458,7 +458,8 @@ rem :: https://github.com/3F/hMSBuild/issues/8
 set vswfilter=!vswPriority!
 
 :_vswAttempt
-call :dbgprint "attempts with filter: " vswfilter vswPreRel vswbin
+call :dbgprint "attempts with filter: " vswfilter vswPreRel
+call :dbgprint " using: " vswbin
 
 set "vspath=" & set "vsver="
 for /F "usebackq tokens=1* delims=: " %%a in (`"!vswbin!" -nologo !vswPreRel! -requires !vswfilter! Microsoft.Component.MSBuild`) do (
@@ -523,17 +524,17 @@ for /F "tokens=1,2 delims=." %%a in ("!vsver!") do (
     rem https://github.com/3F/hMSBuild/issues/3
     set vsver=%%~a.0
 )
-REM Workaround for VS2019, may use 'vswhere -find' instead
-if !vsver! geq 16.0 set vsver=Current
-set _msbp=!vspath!\MSBuild\!vsver!\Bin
+REM VS2019 changes the path
+if !vsver! geq 16 set vsver=Current
+
+if not exist "!vspath!\MSBuild\!vsver!\Bin" set "%3=" & exit /B 0
 
+set _msbp=!vspath!\MSBuild\!vsver!\Bin
 call :dbgprint "found path via vswhere: " _msbp
 
-if not defined notamd64 (
 if exist "!_msbp!\amd64" (
     call :dbgprint "found /amd64"
-    set _msbp=!_msbp!\amd64
-)
+   set _msbp=!_msbp!\amd64
 )
 call :msbfound _msbp _msbp
 
@@ -609,7 +610,7 @@ if not defined notamd64 (
 
 :: 7z & amd64\msbuild - https://github.com/3F/vsSolutionBuildEvent/issues/38
 set _noamd=!_msbp:Framework64=Framework!
-set _noamd=!_noamd:amd64=!
+set _noamd=!_noamd:\amd64=!
 
 if exist "!_noamd!" (
     call :dbgprint "Return 32bit version because of -notamd64 key."