CODEWITHSUNDEEP
c++buildcmakecode-generation
Denis Kotov
Denis Kotov

Reputation: 892

Cmake Custom target that runs only once

I need to somehow generate .fidl files based on .cpp and .hpp files. The problem is that if I try to use add_custom_target it runs every time. For add_custom_command I need specify output files, but I do not want to do it. I'd like to do something like this:

add_custom_command(gen_fidl
                   DEPENDS "*.fidl"
                   COMMAND <My Commands>)

But in this case I need specify a rule for .fidl files

How would I be able to do something like this?

Upvotes: 3

Views: 2502

Answers (2)

Leonid
Leonid

Reputation: 74

The general answer is following: If you don't know which files are generated, you should use approach with "fake" file like Denis Kotov suggested. Otherwise something like that is better:

# definition of fidl_list
add_custom_command( OUTPUT ${fidl_list}
    DEPENDS ${input_files_or_folders_for_generation}
    COMMAND <command_to_do> )

add_custom_target(fidl_gen DEPENDS ${fidl_list})

Upvotes: 1

Denis Kotov
Denis Kotov

Reputation: 892

I've found the following solution:

add_custom_command(
        OUTPUT fidl_generated_successfully
        DEPENDS ./cmake-build-debug/*.fidl
        COMMAND touch fidl_generated_successfully
        COMMAND <COMMAND TO DO>)

add_custom_target(
        fidl_gen
        DEPENDS fidl_generated_successfully)

add_dependencies(${PROJECT_NAME} fidl_gen)

But the issue there is the generation on the file (fidl_generated_successfully). Are there anywhere better solution without creating useless file fidl_generated_successfully

Upvotes: 2

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