How to Make Temp Directory In Cmake?

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To create a temporary directory in CMake, you can use the file(TO_NATIVE_PATH) command to convert a given path to its native form, and then use the file(MAKE_DIRECTORY) command to create the directory. For example:

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file(TO_NATIVE_PATH "${CMAKE_BINARY_DIR}/temp" TEMP_DIR)
file(MAKE_DIRECTORY "${TEMP_DIR}")


This code snippet first generates the path to the temporary directory within the build directory (CMAKE_BINARY_DIR), then creates the directory using the file(MAKE_DIRECTORY) command. This allows you to easily create a temporary directory in CMake for temporary storage or workspace purposes.

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How to access files within a temporary directory in CMake?

To access files within a temporary directory in CMake, you can use the FILE command to manipulate files and directories. Here is an example of how you can access files within a temporary directory:

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# Create a temporary directory
file(TO_NATIVE_PATH "${CMAKE_BINARY_DIR}/temp" TEMP_DIR)
file(MAKE_DIRECTORY "${TEMP_DIR}")

# Copy a file to the temporary directory
file(COPY "path_to_file/input.txt" DESTINATION "${TEMP_DIR}")

# Access the file within the temporary directory
set(TEMP_FILE "${TEMP_DIR}/input.txt")
message("Temporary file path: ${TEMP_FILE}")


In this example, we are creating a temporary directory in the build directory called "temp" using the file(TO_NATIVE_PATH) and file(MAKE_DIRECTORY) commands. We then copy a file called "input.txt" to the temporary directory using the file(COPY) command. Finally, we set the variable TEMP_FILE to the path of the file within the temporary directory and print out the path using the message command.


By using these file manipulation commands in CMake, you can access files within a temporary directory and perform operations on them as needed.


How to share a temporary directory between multiple CMake projects?

To share a temporary directory between multiple CMake projects, you can follow these steps:

  1. Create a CMake project that generates the temporary directory. This project should create the temporary directory using CMake commands like file(MAKE_DIRECTORY) or file(TO_NATIVE_PATH).
  2. Add a custom target in this project that generates the temporary directory. This custom target can be triggered using a custom CMake command or by simply building the project.
  3. In the other CMake projects that need access to the temporary directory, you can set up a custom command or custom target to copy files to or from the temporary directory. You can use CMake commands like file(COPY), file(REMOVE), or execute_process to interact with the temporary directory.
  4. You can then trigger the custom commands or targets in the dependent projects whenever you need to access the shared temporary directory.
  5. Make sure to set up the necessary dependencies between projects and custom targets to ensure that the temporary directory is properly created and shared between the projects.


By following these steps, you can effectively share a temporary directory between multiple CMake projects in a controlled and organized manner.


What is the syntax for creating a temporary directory in CMake?

In CMake, you can create a temporary directory by using the file command with the MAKE_DIRECTORY option. Here is an example of the syntax:

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file(MAKE_DIRECTORY "${CMAKE_BINARY_DIR}/temporary_directory")


This command will create a temporary directory named temporary_directory in the build directory of your CMake project. You can specify a different path if needed.


How to specify a temp directory in CMake?

To specify a temporary directory in CMake, you can use the set command to assign a path to a variable that represents the temporary directory. Here's an example of how you can do this in your CMakeLists.txt file:

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# Set the temporary directory path
set(TEMP_DIR "/path/to/temp/directory")

# Add the temporary directory path as a compile definition
add_definitions(-DTEMP_DIR="${TEMP_DIR}")

# Use the TEMP_DIR variable in your C++ code
message("Temporary directory path: ${TEMP_DIR}")


In this example, you need to replace "/path/to/temp/directory" with the actual path to the temporary directory you want to use. The add_definitions command is used to define a preprocessor macro that can be accessed in your C++ code. In this case, the variable TEMP_DIR represents the path to the temporary directory.

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