Question 1. What Is Cmake?
CMake is a cross-platform, open-source make system. CMake is used to govern the software compilation method the use of simple platform-impartial and compiler-unbiased configuration files. CMake generates local makefiles and workspaces that may be used within the compiler environment of your preference.
CMake is quite sophisticated: it's far viable to guide complex environments requiring machine configuration, preprocessor era, code generation, and template instantiation.
Question 2. I Want A New Feature In Cmake. What Should I Do?
Report a function request in our Bug tracker Please make sure to examine the antique function requests not to consist of duplicates, consist of precise instructions of the characteristic and proposed implementation.
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Question 3. I Want A New Feature In Cmake. What Should I Do?Document A Feature Request In Our Bug Tracker?
Please make sure to examine the antique feature requests now not to encompass duplicates, include particular instructions of the function and proposed implementation.
Question 4. What Is The Most Recent Version Covered By The Mastering Cmake Book?
A new edition of the Mastering CMake book has been launched which documents CMake 2.6.
The following functions have been added for the reason that printing the book:
New INSTALL command (cmake --help-command INSTALL)
New LIST command (cmake --help-command LIST)
Updated FIND_PATH, FIND_PROGRAM, and FIND_FILE instructions to be
more powerful (cmake --help-command FIND_PATH)
RPATH and Mac OS X install_name aid (cmake --help-command
CPack Beta (now not finished or documented)
EXECUTE_PROCESS became added and replaces EXEC_PROGRAM
Other adjustments were malicious program fixes and internal CMake restructuring.
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Question 5. I Set A Cmake Variable In My Environment, But It Didn't Change Anything. Why?
CMake construct settings are saved in the CMake cache similar to a project's construct tree. They are called CMake "cache entries" and have no relation to your command shell's surroundings variables. Use a CMake GUI (CMakeSetup on Windows or ccmake on UNIX) or the wizard mode (cmake -i) to edit cache entries. Initial values may also be designated for a build by using the -D command line argument to cmake while it's miles first run to supply a new construct tree.
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Question 6. I Change Cmake_c_compiler In The Gui But It Changes Back On The Next Configure Step. Why?
Once a build tree is created with a given compiler it can't be modified. There are an expansion of implementation reasons for this policy.
Question 7. I Run An Out-of-supply Build But Cmake Generates In-supply Anyway. Why?
This means that there is a CMakeCache.Txt document in the source tree,probably as part of an existing in-supply build. If CMake is given the course to a directory with a CMakeCache.Txt file, it assumes the directory is a build tree. Therefore if one runs "cmake ../mysrc" to construct out-of-supply however there may be a mysrc/CMakeCache.Txt record then cmake will deal with mysrc because the construct tree. This is a aspect-effect of the characteristic that allows "cmake ." to be used to regenerate a build tree. The behavior will not be changed due to the fact mixing in-source and out-of-source builds is not secure besides (configured headers may be determined in the incorrect area).
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Question eight. Why Does Cmake Use Full Paths, Or Can I Copy My Build Tree?
CMake makes use of complete paths because:
configured header files can also have complete paths in them, and shifting those documents with out re-configuring could motive upredictable conduct. Because cmake helps out of source builds, if custom commands used relative paths to the supply tree, they would not paintings whilst they're run within the construct tree because the present day listing could be wrong.On Unix systems rpaths might be constructed into executables for you to discover shared libraries at run time. If the construct tree is moved antique executables may use the vintage shared libraries, and no longer the brand new ones.
Question nine. How Do I Get The Current Source Or Binary Directory?
The variable CMAKE_CURRENT_SOURCE_DIR contains absolutely the direction to your present day source listing, at the same time as CMAKE_CURRENT_BINARY_DIR points to the equivalent binary directory.
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Question 10. Why Do I Have Unwanted Semicolons ; In My Compiler Flags?
CMake has a listing statistics kind. A list is stored as a string of semicolon-separated list elements. Whitespace separated arguments to a SET announcement are interpreted as list elements. For instance, SET(var a b c d e) will provide "var" a cost of a;b;c;d;e and this list may be used by different CMake instructions. However, if you pass $var to a non-CMake outside device, such as a compiler's command line, you're passinga;b;c;d;e which is not what you want. Instead you either need to pass "$var", in order that the list will be transformed to a whitespace-separated string, otherwise you want to SET(var "a b c d e") inside the 1st location so you're working with a string, not a list.
Question 11. Can I Build Both Shared And Static Libraries With One Add_library Command?
No. Each library you build must have a completely unique goal call, i.E. The "libname" area of the ADD_LIBRARY command. That way, CMake can trackdependencies one by one for every library. Libraries will have the same OUTPUT_NAME, see the SET_TARGET_PROPERTIES command, however this isn't the default.
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Question 12. Does Cmake Support "comfort" Libraries?
CMake does no longer presently aid convenience libraries. A "convenience" library, as GNU libtool calls it, is an archive of items to be blended into other libraries. Other libraries "link" to the convenience library, but the convenience library does now not export any symbols; GNU libtool never installs the benefit library; no packages ever hyperlink to the benefit library. This does no longer suggest that a undertaking using convenience libraries can't be transformed to CMake. Instead the source files may be indexed in each goal that needs them. They will be constructed for every target separately the use of all of the preprocessor definitions and flags configured for that target.
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Question 13. What Is The Best Way To Distribute Source Code Or Binaries For A Cmake-based Project?
For creating source or binary packages there may be now CPack coming with CMake, see the documentation. Of path you could additionally use any other ways to create packages.
Question 14. Can Cmake Set The Debugging/running Directory Property In Visual Studio Projects?
Not immediately. The cost of this assets isn't always stored within the task files. It is saved in more documents created through the IDE whilst an answer is loaded (VS .NET 2003 makes use of a hidden .Suo file subsequent to the .Sln answer document). The layout of those files is not known to CMake and can't be generated. In some versions of VS the documents are binary and now not human readable. However, for Visual Studio versions as a minimum 2005 and more recent, Ryan Pavlik maintains CMake modules that could create these documents: main script, additionally calls for this listing.
Question 15. What Is Cmakelists.Txt?
Input Text Files that include the task parameters and describe the waft control of the construct technique in cmake language.
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Question 16. What Is Cmake Cache?
CMake makes use of the cache whilst it is re-going for walks itself in the course of a construct due to the fact a CMakeList file modified, or when you make rebuild_cache . It also masses the cache at begin of a everyday configure run.
Question 17. What Is Cmake Generator?
A CMake Generator is responsible for writing the input documents for a local build device. Exactly one of the CMake Generators have to be selected for a build tree to decide what local build system is to be used. Optionally one of the Extra Generators may be selected as a variant of a number of the Command-Line Build Tool Generators to supply task files for an auxiliary IDE.
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