![]() ![]() I can't find information on how to create file at build time with CMake, so any help is appreciated. However, the tool I'm using requires directory for a file to be pre-existed it doesn't create a directory automatically.Ĭurrently my CMake macro looks like this: MACRO(ConvertToBinary _name)ĬOMMAND $īut it did not work. Just keep in mind that the semicolons and whitespace are special in CMake and you’ll be fine.I'm writing a custom command in CMake to convert a file to binary format at build time. Once you get past the fact that CMake has no type system of any kind and lists are actually just strings, they can be really useful and rather easy to use. I find the list command operations much more succinct and more readable. My personal preference is to stay away from explicit loops unless absolutely necessary. This may further reduce the number of use cases for index-based iteration in your CMake code. Note that it’s actually safe to specify a fixed SUBLIST length – it always truncates to the valid range.Ī recent addition to the foreach family is the IN ZIP_LISTS form: set(foo 1 2 3) This may not be the most readable way to do it though, so allow me to introduce the list command – it supports a wide range of operations. Nothing surprising there, really, just relying on the basic properties of a list described in the previous paragraph. This results in the following: foo: A B C DĪs you can see appending (and prepending actually) can be done with the set command and variable expansion. I’ve already shown how to define a list, let’s move on to something equally basic – appending. Recent versions of CMake support quite a rich set of operations – pretty much everything you’d expect is there. Operations on listsĬMake lists can be iterated, searched, sorted, reversed, transformed. So we have a list, let’s look at what can be done with it. A caveat of that is that if whitespace is supposed to be part of the string, the entire string must be quoted – this is the only way to disambiguate. In fact, anytime you supply a sequence of whitespace-separated arguments to a command they are implicitly converted to a list. This may be done explicitly – by assigning the variable to a string containing semicolons, or implicitly, by specifying each element separated with whitespace. B buildĪs you can see a list may be declared using the set command. The above results in the following output $ cmake -S. If not, here’s an example of how a list might be declared: set(imaList1 "This is a list") Kind of like every square is a rectangle, but not every rectangle is a square. Because who needs a type system, right? This may also be true the other way around – a string may be a list, but isn’t necessarily one. A concrete definition could be formulated as follows: A CMake list is a semicolon-separated sequence of elements.Īnd since everything in CMake is a string, this means that a list is a semicolon-separated sequence of strings, making itself a string. But let’s move on before we get too philosophical.ĬMake takes a different approach. We could also be all functional and say that a list is a data structure that consists of a head and a tail, where the tail is itself a list, that may be empty. We may want to be more precise about it and consider implementation details like if it’s a node-based or contiguous memory layout. So, no there is no way to use the list command on strings directly. What is a list? In the broadest sense, it’s a sequential collection, or container, of elements. There is no such thing as a list with spaces in CMake, that is a string. ![]() One of them is that virtually everything is a string, including the main subject of this post – lists. I generally like CMake and I think it’s currently the best tool out there for building cross-platform C++ projects, but it does suffer from some of the (what I assume are) legacy design decisions. IE the macro will only be added to your exe/library. The reason you should prefer this approach over any other approach is because it granularity is target based. So, let me warn you right away – I rant a little in this one. If you are using CMake 3.X your first choice for adding a preprocessor macro should be targetcompiledefinitions. ![]()
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