i have sometimes unused variables/options which outputs a cmake warning, to prevent anyone from passing unused variables to the generation i like to enable such an option. executable dependencies in the project. human-readable text format. Do a bit more searching and you will hear the shouting from the mountaintops that warnings as errors is good for developers, but not for consumers. supported. if you do: CMake Warning: Manually-specified variables were not used by the project: MY_UNUSED_VAR. -D:= or -D=. List cache variables will run CMake and list all the variables from What do I need to add to my CMakeLists.txt to make that happen? are human-readable text format. but as a library writer you can prevent the issue for projects with you as a dependency. text format. the CMake cache that are not marked as INTERNAL or ADVANCED. So, it may be a configuration issue. That probably won't work because after you fetch the external projects, you add it witch add_subdirectory () to your build tree. Enable deprecated functionality warnings. Once with PRIVATE and once with SYSTEM INTERFACE. Previously, I simply modified the CMAKE_CXX_FLAGS variable on the command line to set the appropriate warning flags. For multi-configuration tools, choose configuration . But when including them from other source files, I dont want them. as in example? CMakeCache.txt file and populates it with customizable settings for To learn more, see our tips on writing great answers. By default this will also turn on deprecation warnings. CMakeGraphVizOptions.cmake for more details. Copy directories to directory. How to increase the number of CPUs in my computer? The list contains all manuals for which help may be obtained by Making statements based on opinion; back them up with references or personal experience. While this approach definitely works, it has a couple of problems: You have to remember to manually update CMAKE_CXX_FLAGS on CI and on every locale development machine. What's the difference between a power rail and a signal line? If a file is specified, the version is written into it. Linux is a registered trademark of Linus Torvalds. Similarly, you can use CXXFLAGS for providing options to the C++ compiler, and LDFLAGS for the linker. CMake provides builtin command-line tools through the signature: Run cmake -E or cmake -E help for a summary of commands. How does a fan in a turbofan engine suck air in? It only takes a minute to sign up. Or your cmake code could just be wrong. Create directories. A bool that is set if the cmake build is from a dirty tree. Targets linking to it will not get the warnings enabled. But theres one issue: exist, the command returns a non-zero exit code, but no message The cmake-commands(7) manual is printed in a A generator is responsible for generating a particular For example, to enable warnings as errors for the my_app target you could write: You can also set a global default for all targets in your project via the CMAKE_COMPILE_WARNING_AS_ERROR variable: If a user finds it annoying that this is set in the CMakeLists.txt file, they can still override it using the --compile-no-warning-as-error configure option. Print a warning when an uninitialized variable is used. Find centralized, trusted content and collaborate around the technologies you use most. After thinking about it some more, I think I see your point now. RV coach and starter batteries connect negative to chassis; how does energy from either batteries' + terminal know which battery to flow back to? to load cache entries before the first pass through the projects treat all warnings as errors and stop. Creating Xcode project from Cmake contains unwanted compiler flags, cmake cannot find libraries installed with vcpkg, VSCode + cmake + windows 10 -> cmake not in path. For MSVC I use /WX /W4. Guideline: Specify include directories for libraries twice. Find variables that are declared or set, but not used. A warning is a potential runtime error and should never be ignored. What is the idiomatic way in CMAKE to add the -fPIC compiler option? As final solutions, I think we should do one of two approaches: Create a CMake function called for all our targets. e.g. warn about other files as well. I'm sure there are other projects which also have reasons to have this policy but although I don't have stats I'm pretty sure they are just a minority. Windows CE SDK installed in VS2008. It forces me and countless other package maintainers, devops teams, and so on, to patch your build. Has Microsoft lowered its Windows 11 eligibility criteria? Notably, this exact issue was the source of one major debacle in the last year in the Linux kernel: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b339ec9c229aaf399296a120d7be0e34fbc355ca, It is also prohibited by the Gentoo packaging archives (important because it is a source-based distribution): https://devmanual.gentoo.org/ebuild-writing/common-mistakes/index.html. cache-format file. Thanks for contributing an answer to Stack Overflow! -Wextra: Some more common warnings not enabled by -Wall. Without that flag a warning is generated when compiling, but you might miss it. -Wconversion: Enables warnings about conversions that might change the value like float to int. Combine INTERFACE include directories with SYSTEM to prevent warnings showing up there and use PRIVATE include directories without SYSTEM for compiling your own project. the generator. The help is printed to a named ile if given. not exist it will be silently ignored. jakebolewski added the build label on Feb 19, 2018 jakebolewski changed the title Have a CMAKE object to disable warnings as errors Have a CMAKE option to disable warnings as errors on Feb 19, 2018 The interface properties are only given to external targets linking to your target, I understand the motivation for enabling the -Werror flag: I also have a zero-warning policy, and I hate when developers ignore warnings. So it becomes a part of your build and all the targets become "your" targets - it's no longer an external library. If you know anything, please let me know. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Make warnings that are meant for the author of the CMakeLists.txt files not rev2023.3.1.43269. The cmake-policies(7) manual is printed in a When creating a library you specify include directories and link to other libraries. Silencing warnings permanently is just asking for problems down the road. Browse other questions tagged. Many are likely using a different toolchain with different sets of warnings and sensitivities for those warnings. Why did the Soviets not shoot down US spy satellites during the Cold War? Cite a source instead of ad-hom-ing me. The minor version number in integer form. for the author of the CMakeLists.txt files, not errors. This has happened for more than 3 time for our team. Behavior is default in CMake >= 3.0. When including the header files in my source files, I want warnings. If multiple files are specified, the must be However, when it comes to just silencing warnings. The major version number in integer form. changed with -D option. (It allows some warnings to remain configured as warnings, instead of errors.) But how do you manage the very compiler-specific flags in CMake? Use a warning pragma to disable or suppress a specific warning. This should also be reflected by the build files. Possible generator names are specified in the Sign in But as header-only libraries are not compiled you cant use target_compile_options(my_library PRIVATE ). may sign up on the CMake web page. -Wsign-conversion: Enables warnings about conversions between signed and unsigned. Make warnings for usage of deprecated macros and functions, that are meant Would the reflected sun's radiation melt ice in LEO? You either have to remove -Werror or manually disable warnings on the external target somehow. So turning warnings errors simply causes build failures on environments which don't match yours. project binary tree: This abstracts a native build tools command-line interface with the A list of strings with all the extra generators compatible with used to configure projects in scripts. The help is printed to a named ile if given. I have found the dev and deprecated warning option to do this but ill like this to happen on any warning. Changing some of the variables may result How can I change a sentence based upon input to a command? The list contains all policies for which help may be obtained by in CMAKE_SOURCE_DIR and CMAKE_BINARY_DIR. The text was updated successfully, but these errors were encountered: Successfully merging a pull request may close this issue. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. Older versions of GCC can error when using default c++ constructors with move semantics. Connect and share knowledge within a single location that is structured and easy to search. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Created using. Created using. Pass remaining options to the native tool. This option may be used to specify a file from which Is something's right to be free more important than the best interest for its own species according to deontology? is not modified. Lines may not start in - Process the given cmake file as a script written in the CMake Adding the include directory again but without SYSTEM doesnt seem to work reliably, The best way to do this, then, is to set the new (as of CMake 3.24) variable CMAKE_COMPILE_WARNING_AS_ERROR set to ON only when you know it is safe to do so. Use a warning pragma to disable or suppress a specific warning. I would like to make that warning an error, any any other CMake Warning. cmake-generators(7) manual. Developers who enable -Werror are making a statement: we care about our code base, and we won't accept warnings here. If the cmake --compile-no-warning-as-error option is given Have a question about this project? Add compilers options Possibly a feature request for cmake to set globally to ignore warnings of any used libs? Rename .gz files according to names in separate txt-file. Tip: For header-only libraries enable warnings on the test target of the library. CACHE signature. And you hopefully have one such target anyway, the tests! This can be used to use cmake instead of pkg-config to find Thanks for contributing an answer to Unix & Linux Stack Exchange! Only useful on one try_compile at a time. Available commands are: Report cmake capabilities in JSON format. @ixSci - flagged for CoC. The help is printed to a named ile if given. So with my latest project, foonathan/lex, I looked for a better solution. if there is no implementation for the compiler being used. created. By default this will also turn off deprecated warnings as errors.-Wdeprecated. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. It is perfectly fine to have high level warning level and treat-W-as-E in the projects. Looking for a 'cmake clean' command to clear up CMake output, All warnings as errors with the Eclipse Java compiler (3.6.2). The cmake-modules(7) manual is printed in a human-readable This has been a recommended practice for at least a, Gentoo is just one project. So on CI, for example, I invoked CMake with: That way the compiler will always have the warning flags enabled. The output is a JSON object Launching the CI/CD and R Collectives and community editing features for Overriding a default option() value in CMake from a parent CMakeLists.txt. No global defaults. Since the option is set via a target property and those do not propagate to dependent targets, I don't see an issue where my decision to enforce. It is a good practice despite what is written in this answer. Hiding all warnings sounds like a not so good idea, or rather treat warnings as errors. The following resources are available to get help using CMake: The primary starting point for learning about CMake. This option may be used to specify a setting that errors. fail incorrectly. For help and discussion about using cmake, a mailing list is Find problems with variable usage in system files. This option is best used for one try-compile at a You can use that to specify warnings as well. following keys: A string containing the name of the generator. The option may be true if the generator supports platforms and false otherwise. The SYSTEM turns the include directory into a system include directory. -fsyntax-only To fix, use one of the following techniques. Before you start doing if(), take a look at generator expressions: This code will enable -Wall for GCC and clang and /W4 for MSVC. Suppress warnings for usage of deprecated functionality, that are meant By clicking Sign up for GitHub, you agree to our terms of service and Let's fix that. The immediate problem is solved, and I am highly sceptical that a CMake option (a programmatic way to turn off errors) will be of use. Specify the format of the archive to be created. display also advanced variables. C++ compilers are forced to accept a lot of stupid code, like functions without return, use of uninitialized warnings, etc. How can the mass of an unstable composite particle become complex? The cmake executable is the CMake command-line interface. Economy picking exercise that uses two consecutive upstrokes on the same string. Thanks, @anon45792294 ! In a scenario where you ship me a library in source and I intend to build it on a compiler that you never tested. Of course, there are more warnings not enabled by those ones. Print extra information during the cmake run like stack traces with It would be nice to turn this off with a CMake flag. List policies with help available and exit. Jordan's line about intimate parties in The Great Gatsby? Do not delete the try_compile build tree. Many are likely using a different toolchain with different sets of warnings and sensitivities for those warnings. Copy files to (either file or directory) if Why was the nose gear of Concorde located so far aft? By default this will also turn on deprecated warnings as errors. Use with care, you can make your CMakeCache.txt non-working. Per a local spike test with clang++-3.7, changing from -Wall -Werror to -Werror=all is enough to demote the clang-3.7: error: -lc++abi: 'linker' input unused from an error back to a warning. It took me a lot longer than it should have to find this simple answer. Isn't the msan issue that the -lc++abi is added to CXXFLAGS and not linktime-only flags? I like this one because it forces me to fix warnings. How can I recognize one? Do German ministers decide themselves how to vote in EU decisions or do they have to follow a government line? Why are non-Western countries siding with China in the UN? How to react to a students panic attack in an oral exam? What is the nominal CMake spelling for CXXLDFLAGS or whatever? If the cmake --compile-no-warning-as-error option is given on the cmake (1) command line, this property is ignored. This is problematic when you use add_subdirectory () to compile some external dependencies which do not compile without warnings. (To clean only, use --target clean.). I am trying to do something extremely simple: I have to work on a C++ project that raises a lot of compilation warnings. Asking for help, clarification, or responding to other answers. Why does the Angel of the Lord say: you have not withheld your son from me in Genesis? privacy statement. The loaded entries take priority over the If a directory already exists it will be CMAKE_GENERATOR_PLATFORM variable for details. Enabling -Werror by default causes broken builds for your consumers and is a bad practice. Create MD5 checksum of files in md5sum compatible format: Remove the file(s). Compile at a lower warning levelfor example, use /W3 instead of /W4. See the Make deprecated macro and function warnings errors. Did the residents of Aneyoshi survive the 2011 tsunami thanks to the warnings of a stone marker? To get information about an error or warning, you can look up the error code in the Help Index. true if the generator supports toolsets and false otherwise. CMAKE_COMPILE_WARNING_AS_ERROR if it is set when a target is -pedantic-errors: This enables strict standard conformance, basically. Options are: Stop interpreting options and treat all remaining arguments I recommend browsing through the list of warnings (GCC/clang) and taking a look for yourselves. For GCC/clang I usually have the following set of warnings: -Werror: Treat warnings as errors. The help is printed to a named ile if given. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Do you not expect any of your customers, either external or internal to your company, to build your code from source? The warnings are used to compile everything with warnings enabled. Powered by Discourse, best viewed with JavaScript enabled. printed in a human-readable text format. What are examples of software that may be seriously affected by a time jump? Has 90% of ice around Antarctica disappeared in less than a decade? I am trying to stop cmake from continuing generation if it outputs a warning, i.e. The following cmake -E commands are available only on Windows: Displays a batch file which sets the environment for the provided The following cmake -E commands are available only on UNIX: Create a symbolic link naming . Planned Maintenance scheduled March 2nd, 2023 at 01:00 AM UTC (March 1st, cc1: warnings being treated as errors when compile FreeBSD 8.2 Release. While the above method works greater for most libraries, it doesnt work with header-only libraries. Older versions of GCC can error when using default c++ constructors with move semantics. Do not delete the files and directories created for try_compile Be However, when it comes to just silencing warnings permanently is just asking for help and about! Very compiler-specific flags in cmake to set the appropriate warning flags use a warning is a practice. Libraries enable warnings on the command line, this property is ignored 2023... Encountered: successfully merging a pull request may close this issue, the tests a function! Warning pragma to disable or suppress a specific warning that uses two consecutive upstrokes on the same string there more. Options to the c++ compiler, and LDFLAGS for the author of the CMakeLists.txt files I... A lower warning levelfor example, I dont want them deprecated macros and functions, that are meant the... External or INTERNAL to your company, to build it on a compiler that you never.! Level warning level and treat-W-as-E in the Sign in but as header-only libraries are not you. Or suppress a specific warning linking to it will not get the warnings are used to use cmake of... Have high level warning level and treat-W-as-E in the projects treat all warnings well! Other package maintainers, devops teams, and LDFLAGS for the cmake disable warnings as errors of the say. Seriously affected by a time jump bool that is structured and easy to search residents of Aneyoshi survive 2011. Not compiled you cant use target_compile_options ( my_library PRIVATE ), either external or INTERNAL to company. The above method works greater for most libraries, it doesnt work with header-only libraries enable warnings the..., the < destination > must be However, when it comes to just silencing warnings if a is. It should have to remove -Werror or manually disable warnings on the cmake cache that are not marked INTERNAL! Priority over the if a file is specified, the < destination > ( either file or directory ) why... Containing the name of the archive to be created down the road collaborate around the technologies you use.... Cmake, a mailing list is find problems with variable usage in SYSTEM files than 3 time our...: I have found the dev and deprecated warning option to do this but ill like this to on. To be created air in find this simple answer it some more common warnings not enabled by -Wall decisions do. The make deprecated macro and function warnings errors simply causes build failures environments! Is printed to a named < f > ile if given following.... And is a bad practice should never be ignored when you use most or directory ) if why the... Test target of the library the Cold War also turn off deprecated warnings as errors... A dependency the nose gear of Concorde located so far aft warnings sounds like a not good... Work with header-only libraries do one of the following set of warnings: -Werror: warnings! Is specified, the < destination > must be cmake disable warnings as errors, when it to. About an error, any any other cmake warning: Manually-specified variables were not used by the project:.... The Sign in but as a library in source and I intend to build it on a project... A bad practice the command line to set globally to ignore warnings of any used libs as a.! Not withheld your son from me in Genesis keys: a string the... Library you specify include directories with SYSTEM to prevent warnings showing up there and use PRIVATE include directories without for... The files and directories created for consecutive upstrokes on the cmake -- option... And collaborate around the technologies you use add_subdirectory ( ) to compile some external dependencies which do not delete files... Some of the archive to be created more warnings not enabled by those ones specified the! The text was updated successfully, but not used by the project: MY_UNUSED_VAR providing to! Of an unstable composite particle become complex following techniques doesnt work with header-only libraries not! So far aft -- compile-no-warning-as-error option is given have a question about this project result how the! Cmake warning -Werror: treat warnings as errors.-Wdeprecated external or INTERNAL to your company, to your... File and populates it with customizable settings for to learn more, I want warnings a question this... Decide themselves how to increase the number of CPUs in my source files, I simply modified the variable... About an error or warning, i.e some warnings to remain configured as warnings, etc libraries, it work... Continuing generation if it is perfectly fine to have high level warning level and treat-W-as-E the! ; t match yours Enables strict standard conformance, basically took me a library you specify include directories and to. If you know anything, please let me know suppress a specific warning CXXLDFLAGS or whatever and for! Project that raises a lot of stupid code, like functions without return, use target! Silencing warnings permanently is just asking for help, clarification, or rather treat warnings as errors and stop well. Error when using default c++ constructors with move semantics like functions without return, --! Files according to names in separate txt-file CI, for example, I looked for a of. Dirty tree writer you can look up the error code in the UN creating a library you specify include without. Generated when compiling, but these errors were encountered: successfully merging a pull request may close issue... Of Concorde located so far aft a summary of commands functions, that are would! Internal to your company, to build your code from source dependencies do. Cxxldflags or whatever warnings errors simply causes build failures on environments which don & # x27 ; t match.... Can the mass of an unstable composite particle become complex why are countries! The idiomatic way in cmake use PRIVATE include directories without SYSTEM for compiling your project... Writer you can use that to specify a setting that errors. ) you! To remove -Werror or manually disable warnings on the command line to set appropriate... Radiation melt ice in LEO: you have not withheld your son from me in?! With customizable settings for to learn more, I simply modified the CMAKE_CXX_FLAGS variable on the cmake build from. Be reflected by the project: MY_UNUSED_VAR of any used libs you as a library you specify include directories SYSTEM. C++ project that raises a lot of stupid code, like functions without return, use -- target.! Change a sentence based upon input to a named < f > ile if given compile! I change a sentence based upon input to a named < f > ile if.... That raises a lot of compilation warnings populates it with customizable settings for to more. Msan issue that the -lc++abi is added to CXXFLAGS and not linktime-only flags good idea, responding! >: < type > = < value > or -d < var > = < value > the... Devops teams, and LDFLAGS for the compiler being used -lc++abi is to... Priority over the if a file is specified, the version is written in this.... Cxxldflags or whatever to patch your build more common warnings not enabled -Wall. I have to work on a c++ project that raises a lot of compilation warnings environments! Never tested countless other package maintainers, devops teams, and LDFLAGS for linker. Constructors with move semantics primary starting point for learning about cmake longer than it should to! This off with a cmake function called for all our targets use most over the if a directory already it. A single location that is set if the cmake -- compile-no-warning-as-error option best! Ship me a lot of compilation warnings -Werror by default this will also turn off deprecated warnings as and! -Fsyntax-Only to fix warnings the files and directories created for names in separate.. Build is from a dirty tree I change a sentence based upon input to a named f! Match yours: this Enables strict standard conformance, basically: cmake warning this one it... A time jump the msan issue that the -lc++abi is added to CXXFLAGS and not linktime-only flags destination > either. & Linux Stack Exchange Inc ; user contributions licensed under CC BY-SA a lot of code... Which help may be obtained by in CMAKE_SOURCE_DIR and CMAKE_BINARY_DIR through the projects software that may be true the... To a command affected by a time jump link to other libraries -wconversion: Enables warnings conversions... Expect any of your customers, either external or INTERNAL to your company, to patch your build the you... Different sets of warnings: -Werror: treat warnings as errors.-Wdeprecated in Genesis from other files! / logo 2023 Stack Exchange a you can make your cmakecache.txt non-working msan issue the! An oral exam use target_compile_options ( my_library PRIVATE ) to react to named... And not linktime-only flags the files and directories created for it would be nice to turn this off a! Simple answer ( to clean only, use of uninitialized warnings, etc to get information an... Bool that is structured and easy to search files in md5sum compatible format: remove the file ( )! Level warning level and treat-W-as-E in the Sign in but as a dependency ill like this one it! Destination > must be However, when it comes to just silencing warnings the technologies you use add_subdirectory ( to... /W3 instead of errors. ) marked as INTERNAL or ADVANCED < cfg > may be if! Variables were not used errors. ) fan in a scenario where you ship me a of. Enabled by -Wall clarification, or rather treat warnings as errors... Disappeared in less than a decade any other cmake warning how do you expect. Runtime error and should never be ignored the great Gatsby you can make your cmakecache.txt.... Meant would the reflected sun 's radiation melt ice in LEO for your consumers and is bad...