Thanks for all your advice. Passing %ERRORLEVEL% as parameter is one workaround, but it would break the ease of implementation by using my script as filter. There obviously exits no way accessing %ERRORLEVEL% from perl without passing it as parameter, so things like 
cmd /c "make  2>&1 | perl vcproj_filter.pl"

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must be changed in batch file like 
make > output.txt 2>&1
perl %ERRORLEVEL% output.txt"

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Unfortunatly the following doesn't work: 
cmd /c "make  > output.txt 2>&1 && perl %ERRORLEVEL% output.txt"

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It seems if you start more then one process using && or | ERRORLEVEL is not set for each process but only for the last one. That's why using my script in a pipe and reading %ERRORLEVEL% would never work. I finally use a seperate perl script from where I make the call to make via system() and gather the return code from $?. The output is filtered afterwards.

Thanks for the help!

In reply to Re^3: access to ERRORLEVEL on Win32 by gkraus
in thread access to ERRORLEVEL on Win32 by gkraus

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