![]() If no such normal variable exists, CMake will then search for a cache entry with that name. ![]() Note that when evaluating Variable References of the form $, CMake first searches for a normal variable with that name. How does CMake search for a cache variable? cmake-gui (1) offers a text field or a drop-down selection if the STRINGS cache entry property is set. Write a string representation of the current date and/or time to the. If an integer RANDOM_SEED is given, its value will be used to seed the random number generator. What is the default length of a string in CMake?ĭefault length is 5 characters and default alphabet is all numbers and upper and lower case letters. The optional UTC flag requests the current date/time representation to be in Coordinated Universal Time (UTC) rather than local time. If the command is unable to obtain a timestamp, the will be set to the empty string “”. What to do with an empty string in CMake? Then you can just string replace the semicolon. Lists in CMake are just semicolon separated strings and when you quote them, you get the list joined with semicolons. List (APPEND ) When it comes to things like compiler flags, this is the tool of choice. The syntax for declaring a variable and setting it if it is not already set is: set(MY_CACHE_VARIABLE “VALUE” CACHE STRING “Description”) This will not replace an existing value. Some variables are already here, like CMAKE_BUILD_TYPE. If you want to set a variable from the command line, CMake offers a variable cache. ![]() Be sure to use a fresh tree each time because once the variable is in CMakeCache.txt the warning won’t appear again. That script gives me a “Manually-specified variables were not used by the project” warning with 3.17.5, 3.18.5, and 3.19.1. When to use fresh tree in CMake command line? The second method uses the list function: that treats CMAKE_ARGS as a list and it appends to its end the new pair. The first method uses the set function: where basically we create a new string that starts with the existing value of CMAKE_ARGS and then we append to its end the new pair. How to append a new argument to CMake _ ARGs list? But when you write this line without quotes: You create a list of three items instead: “a”, “b” and “c”. When you write: you create a string with the value “a b c”. It’s important to know how CMake distinguishes between lists and plain strings. How is a list different from a string in CMake?
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