LibJuice_FOUND

[foxnight2]

libdatachannel/cmake/Modules/FindLibJuice.cmake

Line 8 in bdb1753

if (LibJuice_FOUND)

when does the LibJuice_FOUND become True?
I only find the variable on this file.

[chobie]

I think it's easy to understand if you ask ChatGPT general programming questions.

The following text is the result of your inquiry to ChatGPT regarding your question.

The `LibJuice_FOUND` variable in your CMake script becomes `TRUE` under specific conditions. Here's how the process works:

1. **Finding the Library and Include Directory**:
    - The script first uses `find_path` to locate the header file `juice/juice.h`, and `find_library` to find the library named `juice`. If these are found, `JUICE_INCLUDE_DIR` and `JUICE_LIBRARY` variables are set respectively.

2. **Handling Standard Arguments**:
    - The script then includes `FindPackageHandleStandardArgs` and calls `find_package_handle_standard_args` with `LibJuice` as the package name and the previously set `JUICE_LIBRARY` and `JUICE_INCLUDE_DIR` as the required variables.

3. **Determining `LibJuice_FOUND`**:
    - The function `find_package_handle_standard_args` is key here. It checks if the required variables (`JUICE_LIBRARY` and `JUICE_INCLUDE_DIR`) are valid (i.e., they point to existing files/paths). If both these variables are valid, `find_package_handle_standard_args` sets `LibJuice_FOUND` to `TRUE`.
    - If either `JUICE_LIBRARY` or `JUICE_INCLUDE_DIR` is not valid (e.g., the file or path doesn't exist or is incorrect), `LibJuice_FOUND` will not be set to `TRUE`.

4. **Conditional Block Based on `LibJuice_FOUND`**:
    - If `LibJuice_FOUND` is `TRUE` (meaning both the library and include directory were found and are valid), the `if` block is executed. Inside this block, an imported target `LibJuice::LibJuice` is created and configured with the found library and include directories.

In summary, `LibJuice_FOUND` becomes `TRUE` when both the `juice` library and the `juice/juice.h` header file are successfully found in the system. If either of these is not found, `LibJuice_FOUND` remains `FALSE`, and the `if` block will not be executed.

[chobie]

ChatGPT sometimes gives inaccurate answers, so in those cases, I think it's good to research on your own.

[paullouisageneau]

FindLibJuice.cmakeis a CMake helper to find a the libjuice library, it is only used if you link against libjuice installed system-wide with USE_SYSTEM_JUICE, otherwise CMake simply compiles and link against the libjuice submodule.