The main drawback to a configure-time copy is that if the configure stage is not fast, re-running CMake every time the input file changes can be annoying. If the file contents can be generated at configure time, this is often the simplest approach. The most effective way to generate content to be used as source files depends on a number of factors. The configure_file() command makes this trivial and even has the ability to transform the input such that $/generated.cpp The easiest scenario involves copying a file from somewhere into a known location during the configure stage and using it as a source or header file in the build stage. CMake provides a range of functionality which can be used to create files, but getting build dependencies correct is an area where many developers struggle or even simply give up. ![]() ![]() This is relatively easy with CMake, but things get more interesting when some of the source files need to be generated as part of the build. Using a set of source files to build libraries and executables is about the most basic thing a build system needs to do.
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