8/8/2023 0 Comments Important cmake variablesHow else would one call legacy functions doing set(. So even if we got such a system, having return values in âclassic CMakeâ would be good, because they would offer a nicer FFI between the old world and the new world. Important CMake variables controlling the build of DIPlib: CMAKEINSTALLPREFIX: Choose an install location for all the components except PyDIP. Alternatively, set them in the CMake GUI. Letâs be real, is it really going to happen?Ä«esides, and grand new system will have to have pretty good interoperability with existing CMake modules to be a viable successor in practice. These variables can be set on the cmake command line with -D.Itâs just about trying to recover the little Scheme hiding within every other language.įor reference, CMake Issue 19891 has some discussion about alternative specification language design.Ä¢ years on, that issue is unsurprisingly a cesspit of random ideas, bikeshedding, and scope-creap - the second-system effect. This variable is defined by versions 2.6.3 and higher. We know from other languages where this road leads, and itâs not to C++/Scala madness. This specifies the full version of the CMake executable being run. The language is not well-suited to such extension IMO. Environment variables may differ from where CMake generated the make environment and when the the make files are put to use. So it could get important to set some variables before those commands are used. The simplicity of basic CMake variables belies the complexity of the full variable syntax. Then people will ask for inline operators, etc., and complexity will keep increasing. A lot of variables used by CMake are set with the project() and enablelanguage() calls. Languages like Javascript, Java, hell even Excel have added new âfunctionalâ syntaxes over time, and I donât think there has been any complaint of code becoming harder to read because more side effects! Quite the opposite, in fact! Since the compiler can be changed from the system default by setting CMAKECXXCOMPILER, I figure the safest way to detect the compiler is to ask cmake itself what its using. The value is also used by the cmake(1) -build and ctest(1) -build-and-test tools to launch the. The people that dislike having to set(.PARENT_SCOP) are also the people that will try to stay away from gratuitous side effects! How can I inspect cmake internal variables As part of our build process, we need to record the details of the machine and compiler. The CMAKEMAKEPROGRAM variable is set for use by project code. The point of being more functional to allow code that has fewer side effects. Function bodies already have side effects. Why does this matter? Statements already have side effects. Once functions have return values, arbitrary expressions with side effects will be possible as discussed above. The more important change is the function() modification that promotes local variables to parent scope donât follow the logic behind your answer. Iâll add that if it needed to be a command, then any of a number of alternative syntaxes would work set(VARS var1 TO example1(foo bar))Ĭmake_language(OUT var1 CALL example1 foo bar) Plus some special syntax for parameter pack expansions (unquoted $") # prints '- X = baz, Y = hello' Or really, that the expression language is exclusively string literals, variable lookup, and concatenation. If set to 5, commands starting with qt will call their counterpart starting with qt5. It needs to be set to either 5 or 6 before the respective findpackage () calls. The real complaint is twofold: (1) there isnât a single function return mechanism and (2) function application is not an expression. An integer that controls the Qt version that qt commands forward to in case of mixed Qt 5 and Qt 6 projects. Of course CMake functions can return values (via set(. A variable FOO is set by adding -DFOOvalue to the CMake command line. Replace is used with back substitution to output only that one group.Your nomenclature is a bit misleading. Following is a description of some of the most important CMake variables which you are likely to encounter. If you want to avoid replacing existing $)Ībove, file(STRINGS file_name variable_name REGEX regex) picks lines that match a regex and the same regex is used to then pick out the parentheses capture group with the version part. in) from one place to another, substituting all CMake variables it finds. This command copies a file (traditionally ending in. Communication with your code Configure FileĬMake allows you to access CMake variables from your code using configure_file.
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