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cmakegrep
Long Smith
Long Smith

Reputation: 1411

CMAKE executing GREP command leaves output variable empty

I am trying to get information from file using regexp from withing a cmake file. Here is a simple file.txt located at my home directory:

entry1
entry2

In CMake I call grep in the following way:

        SET(GREP_ARGS -oP \".*$\" /home/yuriy/file.txt)
        MESSAGE(STATUS ${GREP_ARGS})
        EXECUTE_PROCESS(
            COMMAND
            grep ${GREP_ARGS}
            OUTPUT_VARIABLE MODULE_MSGS
            ERROR_VARIABLE ERR)

However output/error variables are both empty. Moreover I am sure that the command is executed since if I change name of the file to non-existing one I got an error "No such file or directory" inside my output variable. Therefore it seems for me that the issue is in regular expression parameter passing. I have tried to wrap it with " but it does not help.

Calling the same command from bash gives right output on Ubuntu 18.04:

grep -oP ".*$" /home/yuriy/file.txt

Thanks!

Upvotes: 1

Views: 1457

Answers (1)

Long Smith
Long Smith

Reputation: 1411

Finally found a solution. The right way of setting arguments is without \" symbols:

SET(GREP_ARGS -oP .*$ /home/yuriy/file.txt)

Not sure why is it so but it works.

Upvotes: 1

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