How to Run Compound Script Statements From Cmake?

To run compound script statements from CMake, you can use the execute_process command. This command can be used to execute arbitrary scripts or commands during the CMake configuration or build process.

To run compound script statements, you can write your script in a separate file and then use the execute_process command to run that script. For example, you can create a script file called myscript.sh with the following contents:

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#!/bin/bash

echo "Hello"
echo "World"

You can then run this script from CMake using the execute_process command like this:

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execute_process(
    COMMAND bash ${CMAKE_CURRENT_SOURCE_DIR}/myscript.sh
)

This will execute the myscript.sh script and print "Hello" and "World" to the console. You can use this approach to run any compound script statements from CMake during the configuration or build process.

Can you provide an example of running compound script statements in cmake?

Sure! Here is an example of how you can run compound script statements in a CMakeLists.txt file:

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# Define a variable with a compound script statement
set(COMPOUND_SCRIPT "echo 'Hello, this is a compound script statement' && ls")

# Run the compound script statement using the execute_process function
execute_process(
    COMMAND ${COMPOUND_SCRIPT}
    WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
    RESULT_VARIABLE CMD_RESULT
)

# Check if the script was executed successfully
if(CMD_RESULT EQUAL 0)
    message("Compound script statement executed successfully")
else()
    message("Error running compound script statement")
endif()

In this example, the COMPOUND_SCRIPT variable contains a compound script statement that combines two commands: echo 'Hello, this is a compound script statement' and ls. The execute_process function is used to run this compound script statement, and the result of the execution is stored in the CMD_RESULT variable. Finally, a message is displayed based on whether the script was executed successfully or not.

What is the difference between running single and compound script statements in cmake?

In CMake, a single script statement refers to a single command or function call within a CMake script file. This can be a standalone command like project() or a function call like add_executable().

On the other hand, a compound script statement in CMake refers to a group of multiple commands or function calls enclosed within a block structure such as if(), elseif(), else(), or foreach(). These blocks allow for more complex logic and can execute multiple statements based on conditions or iterations.

In summary, the main difference between running single and compound script statements in CMake is the complexity and logic involved. Single statements are typically used for simple commands, while compound statements are used for more advanced logic that requires multiple commands to be executed together.

How to pass arguments to compound script statements in cmake?

To pass arguments to compound script statements in CMake, you can use CMake variables to store the arguments and then access these variables in the compound statement. Here is an example of how you can do this:

1. Define CMake variables to store the arguments you want to pass:

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set(ARG1 "value1")
set(ARG2 "value2")

1. Use the CMake ${} syntax to access these variables in a compound script statement:

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execute_process(
    COMMAND echo "${ARG1} ${ARG2}"
)

1. When you run CMake, make sure to pass the arguments to your script using the -D flag:

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cmake -DARG1=value1 -DARG2=value2 /path/to/your/CMakeLists.txt

By following these steps, you can pass arguments to compound script statements in CMake and use them in your scripts as needed.