Custom commands in different directoriesĪnother use case for add_custom_command() is generating source code files using 3rd party tools. Or, you might want to remove the ALL from your custom target, so that you have to explicitly run make docs to generate the documentation. In practice, you might also want to make the custom command depend on all your source code, so it gets regenerated every time you change the code. But as a special case, you can use add_custom_target(ALL) to create a new target attached to the “all” target: add_custom_target( How about using add_dependencies()? No, you can’t use that with any of the built in targets. So we need to add a dependency between docs/doxygen.stamp and the “all” target. Nothing depends on the documentation, so it isn’t built. But actually, here’s what to expect: nothing! If you build this, you get no output. We have to create a ‘stamp’ file because Doxygen generates lots of different files, and we can’t really tell CMake what to expect. "Generating API documentation with Doxygen" You may live to regret ever letting it in. This is where add_custom_command() enters your life. If your project is a good one then maybe you use a documentation tool like GTK-Doc or Doxygen to generate documentation from the code. There are also “install” and “test” targets built in ( but no “clean” target). What is “all”, in the dependency graph to the left? It’s a built in target, and it’s the default target. When you run CMake, both of them get built. You have a library, and a program that depends on it. This is CMake at its simplest (and best). Here is a hopefully complete list of things you might want to do in CMake that involve custom commands and custom targets depending on each other, and some explainations as to why things don’t work the way that you might expect. What makes it so hard is that there’s not one limitation, but several. But files aren’t targets and have all sorts of exciting limitations to make you forget everything you ever new about dependency management. If you want to generate some kind of file at build time, in some manner other than compiling C or C++ code, then you need to use a custom command to generate the file. If you’ve tried do anything non-trivial in CMake using the add_custom_command() command, you may have got stuck in this horrible swamp of confusion.
Unfortunately, not everything is a target though! To the sub-string beginning at the right-most period.As I said in my last post about CMake, targets are everything in CMake. In commands thatĪccept a LAST_ONLY keyword, LAST_ONLY changes the interpretation The period) and until the end of the filename. By default, the extension isĭefined as the sub-string beginning at the left-most period (including The filename is effectively the last item-name of the path, so itĬan also be a hard link, symbolic link or a directory.Ī filename can have an extension. filenameĪ path has a filename if it does not end with a directory-separator. In other words, /usr///////lib is the same as /usr/lib. If this character is repeated, it is treated as a single directory The only recognized directory separator is a forward slash character /. The ()* characters are not part of the path. Or more item names, with multiple items separated by aĭirectory-separator. The (.)* pattern shown above is to indicate that there can be zero is aĭirectory name that refers to the parent directory. The item name consisting of two dot characters. is aĭirectory name that refers to the current directory. The item name consisting of a single dot character. Path Structure And Terminology ¶Ī path has the following structure (all components are optional, with some The name of a variable into which the result of a command will be written. See the description ofĮach command to see how this is interpreted. With a special separator depending on the command. Ī string literal which may contain a path, path fragment, or multiple paths For commands that expect a Īs input, the variable must exist and it is expected to hold a single path. The following conventions are used in this command's documentation: Īlways the name of a variable. Synopsis ¶ Conventions Path Structure And Terminology Normalization DecompositionĬmake_path( APPEND )Ĭmake_path( APPEND_STRING )Ĭmake_path( REMOVE_FILENAME )Ĭmake_path( REPLACE_FILENAME )Ĭmake_path( REMOVE_EXTENSION )Ĭmake_path( REPLACE_EXTENSION )Ĭmake_path( NORMAL_PATH )Ĭmake_path( RELATIVE_PATH )Ĭmake_path( ABSOLUTE_PATH )Ĭmake_path( CONVERT TO_CMAKE_PATH_LIST )Ĭmake_path( CONVERT TO_NATIVE_PATH_LIST ) a drive letter when the host is not Windows), the results If the path contains elements that are not representable on the host the host platform), not the target system. The cmake_path command handles paths in the format of the build system
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