CODEWITHSUNDEEP
c++cmake
idailylife
idailylife

Reputation: 174

CMake add_custom_command without output

What I need is filtering the *.h and *.cpp files in some directory, then format it using some script, so I write the following codes:

add_custom_command(

    DEPENDS ${GENERATED_STUFF}

    COMMAND find "${OUTPUT_DIR}/include/SOME_PATH" -iname *.h -o -iname *.cpp | xargs /net/binlib/lib/clang/clang-format-3.9.0 -i

    OUTPUT ?????
)

However, this command just modifies the existing files, so no new file outputs are generated. In this case, how can I define the output? Is there any other way to resolve this need? I only want this command to be re-executed only when file changes.

Upvotes: 3

Views: 5761

Answers (1)

Tsyvarev
Tsyvarev

Reputation: 65928

You may create "timestamp" file. It will be used by build system only for extract timestamp and compare it with files under DEPENDS.

add_custom_command(
    DEPENDS ${GENERATED_STUFF}
    COMMAND find "${OUTPUT_DIR}/include/exchange_protocol" -iname *.h -o -iname *.cpp | xargs /net/binlib/lib/clang/clang-format-3.9.0 -i
    COMMAND ${CMAKE_COMMAND} -E touch my_file.stamp
    OUTPUT my_file.stamp
)

For make your add_custom_command work, you need to use add_custom_target which depends on given file.

Upvotes: 5

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