Account
Sign in to you account
Sign In Sign Up

How to Use Empty Entries In Cmake Lists As Arguments?

2 minutes read

In CMake, you can handle empty entries in lists as arguments by using the "IF" statement to check for empty strings before processing the list. You can use the "STREQUAL" or "EQUAL" keywords to compare a variable with an empty string or check the length of the string using the "STRLEN" function. By adding proper logic to handle empty entries, you can ensure that the arguments are processed correctly in your CMake script.


What is the best way to represent an empty entry in a CMake list?

The best way to represent an empty entry in a CMake list is by using a quoted pair of empty parentheses, like so: "<>". This represents a null or empty value in the list.


How to pass multiple empty entries to a function in CMake lists?

To pass multiple empty entries to a function in CMake lists, you can simply use the empty string as a placeholder. Here is an example of how you can pass multiple empty entries to a function in CMake lists:

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12

# Define a function that takes a list as input
function(process_list myList)
    foreach(item ${myList})
        message("Item: ${item}")
    endforeach()
endfunction()

# Create a list with empty entries
set(myList "" "" "")

# Call the function with the list
process_list(${myList})


In this example, we are creating a list myList with three empty entries represented by the empty strings "". We then pass this list to the process_list function which iterates over each item in the list and prints out the item. The output will show three empty strings as expected.


How do I avoid errors when using empty entries as arguments in CMake lists?

One way to avoid errors when using empty entries as arguments in CMake lists is to check for empty values before using them. You can use if statements to check if a value is empty and handle it accordingly.


For example, you can check if a value is empty before adding it to a list like this:

1
2
3

if(NOT "${VALUE}" STREQUAL "")
    list(APPEND MY_LIST "${VALUE}")
endif()


This way, you can prevent any errors that may occur when empty values are used as arguments in CMake lists.


How to distinguish between empty entries and uninitialized variables in CMake lists?

In CMake, you can distinguish between empty entries and uninitialized variables in lists by using the LIST command in combination with the LENGTH function.


Here's an example of how you can check for empty entries in a list:

1
2
3
4

set(my_list "")
if(LENGTH(my_list) EQUAL 0)
   message("Empty list")
endif()


To check for uninitialized variables in lists, you can use the DEFINED function to see if a variable has been set:

1
2
3
4
5

if(DEFINED my_list)
    message("Variable is initialized")
else()
    message("Variable is uninitialized")
endif()


By using these methods, you can easily distinguish between empty entries and uninitialized variables in CMake lists.

Facebook Twitter LinkedIn Telegram Whatsapp

Related Posts:

How to Operate With Json List In Cmake?
To operate with a JSON list in CMake, you can use the jsoncpp library which provides functionality for parsing and manipulating JSON data. By including the library in your CMake project and using its API, you can easily read and write JSON lists in your CMake ...
How to Include Headers In Cmake?
In CMake, you can include headers using the include_directories function. This function allows you to specify the directories where CMake should look for header files during the build process.To include headers in CMake, you need to specify the path to the dir...
How to Use Message() In Cmake?
In CMake, the message() command is used to print text to the console during the CMake configure step. This can be useful for displaying information or debugging messages while the CMake script is running. The syntax for using message() is: message([&lt;mode&gt...
How to Pass Arguments In Pytest By Command Line?
To pass arguments in pytest by command line, you can use the -k flag followed by a keyword expression to select specific test functions or classes to run. You can also use the -m flag to select tests based on markers. Additionally, you can use the -k flag foll...
How to Handle Sys.argv In Pytest?
When using pytest, the sys.argv module can be used to access command-line arguments. However, since pytest manages its own command-line arguments, it is recommended to avoid using sys.argv directly within your test functions.Instead, pytest provides the pytest...