Error on syntax for generating coverage data from multiple files using lcov in Windows

I would like some help... I'm having trouble coming up with the syntax to generate coverage data from multiple files using lcov in Windows.

I have gcov, lcov and genhtml installed on cygwin (I'm running this under Windows). All of those files are inside cygwin/bin directory. The coverage data I flush through I believe are perl scripts created from JsTestCoverage and has the following format:

SF:C:/test/jquery.js
DA:22,1
DA:23,1
...
end_of_r开发者_如何转开发ecord
SF:C:/test/testFile.js
DA:3,1
DA:6,1
...
end_of_record
//rinse and repeat till no more files

Note I have NOT used genhtml on the coverage data yet.

I then tried something like:

perl genhtml /../home/administrator/coverage1.dat /../home/administrator/coverage2.dat

But got an error saying:

genhtml: Can't use an undefined value as a HASH reference at genhtml line 1506.

I'm not sure whether I've got the process wrong either, being not from linux background at all.

Thanks in advance.

Worked out to be that there were repeating results in the coverage data. I took out the repeating data, and the error disappeared.

Thanks.