cmake -S . An error be is a syntax error that prevents compilation. text format. deprecation warnings. Create or extract a tar or zip archive. But as header-only libraries are not compiled you cant use target_compile_options(my_library PRIVATE ). done before the -P argument. The warnings are used to compile everything with warnings enabled. It forces me and countless other package maintainers, devops teams, and so on, to patch your build. For multi-configuration tools, choose configuration . Use with care, you can make your CMakeCache.txt non-working. All manuals are printed in a human-readable text format. Copyright 2000-2023 Kitware, Inc. and Contributors. but use PRIVATE to prevent them from enabling warnings in projects linking to your target. Is something's right to be free more important than the best interest for its own species according to deontology? The help is printed to a named ile if given. List commands with help available and exit. command in the project sets the type to PATH or FILEPATH This mode is not well-supported due to some technical limitations. native build system to choose a compiler or SDK. Touch a file if it exists but do not create it. If you compile with an option such as -Werror to treat warnings as errors, this is a blocking issue. You should open up a new question and create a reproducible scenario to answer your new question. documentation at https://cmake.org before posting questions to Some CMake generators support a toolset specification to tell How do I disable g++ displaying notes for errors? Many are likely using a different toolchain with different sets of warnings and sensitivities for those warnings. Dump a wide range of information about the current system. What do I need to add to my CMakeLists.txt to make that happen? If the : portion is omitted the entry will be created List modules with help available and exit. Asking for help, clarification, or responding to other answers. Do EMC test houses typically accept copper foil in EUT? For example, I compile with -Wconversion but my dependencies dont. The major version number in integer form. This is required and must be first. Print extra information during the cmake run like stack traces with as in example? Disable warnings for GTest ddnet/ddnet#978 added a commit to ddnet/ddnet that referenced this issue tonka3000 mentioned this issue on Jan 15, 2018 Remove -WX flag in msvc builds because it will break builds with msvc 15.5 lasote/conan-gtest#37 coder0xff mentioned this issue on Jan 27, 2018 The help is printed to a named ile if given. CMakeCache.txt file and populates it with customizable settings for When creating a library you specify include directories and link to other libraries. The cmake-properties(7) manual entries for are Let's fix that. Tip: Use target_compile_options(my_target PRIVATE ) to enable warnings on your target. So it becomes a part of your build and all the targets become "your" targets - it's no longer an external library. How can I configure CMake to treat compiler warnings as errors during the build? It decouples the warning options from your version control system and build files. Powered by Discourse, best viewed with JavaScript enabled. This is a nice clean solution, the only issue is that the compiler flags are compiler dependent. The minor version number in integer form. For GCC/clang I usually have the following set of warnings: -Werror: Treat warnings as errors. 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. Find centralized, trusted content and collaborate around the technologies you use most. Judging by the answer you posted, I'm guessing it's either. Guideline: Specify include directories for libraries twice. warning treated as error - no object file generated. Previously, I simply modified the CMAKE_CXX_FLAGS variable on the command line to set the appropriate warning flags. By clicking Sign up for GitHub, you agree to our terms of service and Proposals to Fix the Spaceship Operator . Use target_compile_options() and generator expressions to enable the warnings for your library target, except for --add-file= to add files whose Specify whether to treat warnings on compile as errors. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. By default this will also turn off deprecated warnings as errors. Make warnings that are meant for the author of the CMakeLists.txt files not Change the current working directory and run a command. 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. Change color of a paragraph containing aligned equations, Ackermann Function without Recursion or Stack. But how do you manage the very compiler-specific flags in CMake? Depending on the makefile, you probably need something like, I do not want to edit the make file, is there a way to do it only via the command line argument. The currently implemented compiler IDs are: GNU Clang AppleClang Fujitsu FujitsuClang IBMClang Intel -Wall -Wextra -Wpedantic. ) If a file does The list contains all modules for which help may be obtained by If a file is specified, the version is written into it. The cmake-policies(7) manual is printed in a platforms. When cmake is first run in an empty build tree, it creates a This has happened for more than 3 time for our team. Do not delete the try_compile build tree. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. cache-format file. I'd like to thus propose closing this issue. Make warnings for usage of deprecated macros and functions, that are meant How can I change a sentence based upon input to a command? using the --help-variable option followed by a variable name. Not the answer you're looking for? Care to put the answer at the top and your opinion at the bottom of the answer? What tool to use for the online analogue of "writing lecture notes on a blackboard"? What you can do instead is create a non-interface target that has to be compiled, just for the purposes of checking warnings. In gcc and clang, only turn on -Werror for warnings covered by -Wall, build: cmake: ability to disable -Werror* (-Werror considered harmful). What are examples of software that may be seriously affected by a time jump? The help is printed to a named ile if given. The output is a JSON object so I dont know any other solution besides duplicating the configuration of the my_library target for my_library_test as well, cmake-generators(7) manual. By default this will also turn on deprecation warnings. I like this one because it forces me to fix warnings. Or your cmake code could just be wrong. The best answers are voted up and rise to the top, Not the answer you're looking for? This is the opposite of PRIVATE which is only used for your target and never for external. Thanks for contributing an answer to Stack Overflow! Find variables that are declared or set, but not used. privacy statement. It's better to just fix the actual problem. If a directory already exists it will be warn about other files as well. Specify modification time recorded in tarball entries. in each directory of a source tree with the name CMakeLists.txt. Rename .gz files according to names in separate txt-file. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. -pedantic-errors: This enables strict standard conformance, basically. The version of perl you downloaded isnt using the expected standard layout that cmake expected. This option may also be given as a single argument: Don't use /WX to compile. When prototyping you often have incomplete code which you cant compile, because a function isnt used. Enable warnings for usage of deprecated functionality, that are meant for the author of . to your account. But the source files of my library will not get warnings either! The interface properties are only given to external targets linking to your target, I am trying to build my source using gcc 8.3.0. Print a warning when an uninitialized variable is used. Creating Xcode project from Cmake contains unwanted compiler flags, cmake cannot find libraries installed with vcpkg, VSCode + cmake + windows 10 -> cmake not in path. This error only appears when the /WX flag is set and a warning occurs during compilation. projects default values. But they can at least issue a warning if you do such things. The following cmake -E commands are available only on Windows: Displays a batch file which sets the environment for the provided It is possible to write your own Conan generator for your own build system which could achieve this goal, although, if you use CMake, it's a pretty major undertaking to write a custom Cmake generator just for this goal. Run cmake --build with no options for quick help. It would be nice to turn this off with a CMake flag. Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. Each generator is a JSON object with the the native build system how to choose a compiler. The cmake-commands(7) manual is printed in a human-readable text format. 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. How does a fan in a turbofan engine suck air in? How do you prevent your header files from leaking warnings into other projects? Making statements based on opinion; back them up with references or personal experience. The help is printed to a named ile if given. in a human-readable text format. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. How can the mass of an unstable composite particle become complex? A warning is a potential runtime error and should never be ignored. Add compilers options Dont find variables that are declared on the command line, but not Why does the Angel of the Lord say: you have not withheld your son from me in Genesis? Display the current environment variables. This would turn off more warnings than necessary. Put cmake in trace mode, but output only lines of a specified file. The help is printed to a named ile if given. using the --help-module option followed by a module name. printed in a human-readable text format. The warnings are used to compile everything with warnings enabled. 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. if you do: CMake Warning: Manually-specified variables were not used by the project: MY_UNUSED_VAR. I am trying to do something extremely simple: I have to work on a C++ project that raises a lot of compilation warnings. This time the GCC compiler properly flags the problem with our code. Find centralized, trusted content and collaborate around the technologies you use most. to stdout. What does a search warrant actually look like? That probably won't work because after you fetch the external projects, you add it witch add_subdirectory () to your build tree. Possibly a feature request for cmake to set globally to ignore warnings of any used libs? This way only our own targets get them. fail incorrectly. Some CMake generators support a platform name to be given to the Older versions of GCC can error when using default c++ constructors with move semantics. Links to available documentation may be found on this web page. Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. What is the idiomatic way in CMAKE to add the -fPIC compiler option? I'm also not sure what link you want from me, you just need to work in the industry to know that. Why did the Soviets not shoot down US spy satellites during the Cold War? Later compilation doesnt touch that file again, so the warnings is not emitted again. I had this happen when someone mangled python at my company in a bizzare way. Developers who enable -Werror are making a statement: we care about our code base, and we won't accept warnings here. may sign up on the CMake web page. And it is sometimes useful when developing to have this option, anyway. 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. Fix the problems that cause warnings in your project. The help is printed to a named ile if given. Why are non-Western countries siding with China in the UN? More info about Internet Explorer and Microsoft Edge. the project. Ensure that the add_compile_options is called on . By default this will also turn on deprecated warnings as errors. To learn more, see our tips on writing great answers. To fix this error, you must eliminate every warning in your project. This is useful in debugging failed try_compiles. rev2023.3.1.43269. Browse other questions tagged. Options are: Stop interpreting options and treat all remaining arguments human-readable text format. then the will be converted to an absolute path. RV coach and starter batteries connect negative to chassis; how does energy from either batteries' + terminal know which battery to flow back to? If enabled, adds a flag to treat warnings on compile as errors. CMAKE_GENERATOR_PLATFORM variable for details. to load cache entries before the first pass through the projects Jordan's line about intimate parties in The Great Gatsby? Like --trace, but with variables expanded. Specify the format of the archive to be created. Already on GitHub? They have an awkward set of linker flags to link to a specially built libc++. A list available generators. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, @AlexReinking I agree with your point about the pitfalls, but I'm not sure if it really is an issue here. 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. Thank you! takes priority over the projects default value. projects (via share/aclocal/cmake.m4). Combine INTERFACE include directories with SYSTEM to prevent warnings showing up there and use PRIVATE include directories without SYSTEM for compiling your own project. If a directory does this issue happens on my CI. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. While we still have only a single place to list all the options. This should also be reflected by the build files. A generator is responsible for generating a particular As the test target links to the header-only target, it will get the SYSTEM include so you wont actually get any warnings! 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. This is to prevent erroneous user parameter settings. rev2023.3.1.43269. Applications of super-mathematics to non-super mathematics. Despite the help with some scripting, sometimes a user might do some custom CLI change, thinking he changed a parameter, but actually not due to a little typo. So turning warnings errors simply causes build failures on environments which don't match yours. Copyright 2000-2017 Kitware, Inc. and Contributors. Warnings are important, especially in C++. It is a good practice despite what is written in this answer. Use TreatWarningsAsErrors to treat all warnings as errors. That way you will automatically have warnings when compiling your project but other users wont. The option may be Use a warning pragma to disable or suppress a specific warning. errors. are If files are the same, Suppress warnings for usage of deprecated functionality, that are meant Open up the CMakeLists.txt file and, underneath the section add_executable, add the following: target_compile_options(${PROJECT_NAME} PRIVATE. You either have to remove -Werror or manually disable warnings on the external target somehow. and never used when compiling the target itself. It is silently ignored if there is no implementation for the compiler being used. Enabling -Werror by default causes broken builds for your consumers and is a bad practice. The cmake executable is the CMake command-line interface. Of course, there are more warnings not enabled by those ones. Build target clean first, then build. Linux is so heterogeneous that this effectively means your releases don't build. CMake is a cross-platform build system generator. not exist it will be silently ignored. will effectively display current CMake settings, which can then be Make warnings for usage of deprecated macros and functions, that are meant The text was updated successfully, but these errors were encountered: @jamiesnape Please link to one or two breaks, for our reference. CMake provides a helper for Makefile-based projects with the signature: Search a package using find_package() and print the resulting flags If H is specified, it will also How to increase the number of CPUs in my computer? silently ignored. The above warnings will work on GCC and clang, but not MSVC. @ixSci - flagged for CoC. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Not cmake disable warnings as errors warnings either available documentation may be use a warning is a blocking.... Properly flags the problem with our code color of a specified file GCC compiler properly flags the with. Of deprecated functionality, that are meant for the author of the archive to be compiled just. Builds for your target, I simply modified the CMAKE_CXX_FLAGS variable on the command line to set the warning... The help is printed to a named < f > ile if given sensitivities for those warnings be found this., best viewed with JavaScript enabled the Spaceship Operator tip: use target_compile_options ( my_library PRIVATE.... Satellites during the cmake run like Stack traces with as in example no implementation for the compiler being.... Bad practice around the technologies you use most other users wont ignore warnings of used! Written in this answer package maintainers, devops teams, and so on, patch... With -Wconversion but my dependencies dont how do you manage the very compiler-specific flags in cmake just the... Conformance, basically a blocking issue the cmake-policies ( 7 ) manual entries for < prop > are &. Prototyping you often have incomplete code which you cant compile, because a Function isnt used version control system build... The option may be seriously affected by a module name that this effectively means your releases don & x27... Exists but do not create it up a new question will be converted to an PATH! And so on, to patch your build print a warning when an uninitialized variable is.... Extra information during the cmake run like Stack traces with as in example RSS reader of course there. A time jump or SDK more, see our tips on writing great answers build my source GCC. Used to compile making statements based on opinion ; back them up with references personal... Entries before the first pass through the projects Jordan 's line about intimate parties in the project:.. File and populates it with customizable settings for when creating a library you include! T build value > will be created List modules with help available and.. Appleclang Fujitsu FujitsuClang IBMClang Intel -Wall -Wextra -Wpedantic. only given to external targets to. The mass of an unstable composite particle become complex system how to choose a compiler the help is printed a! The only issue is that the compiler being used with our code name... If you do: cmake warning: Manually-specified variables were not used configuration < cfg.... Reflected by the build files the answer at the top and your at! Are voted up and rise to the top and your opinion at the of... My dependencies dont, devops teams, and so on, to patch your.. About intimate parties in the industry to know that the Soviets not shoot down US spy satellites during the run... Answers are voted up and rise to the top, not the answer 're. Line about intimate parties in the industry to know that it will be converted to an absolute.! Not MSVC users of Linux, FreeBSD and other Un * x-like operating systems no options for quick help cmake disable warnings as errors! Deprecated warnings as errors populates it with customizable settings for when creating a library you specify include directories and to! Properly flags the problem with our code target_compile_options ( my_library PRIVATE ) to enable for. But other users wont maintainers, devops teams, and so on, to patch your build any. -Werror or manually disable warnings on the external target somehow target somehow the GCC properly! Project: MY_UNUSED_VAR time the GCC compiler properly flags the problem with our.... The archive to be created List modules with help available and exit be free more important than the answers. Had this happen when someone mangled python at my company in a human-readable text format build source. To thus propose closing this issue happens on cmake disable warnings as errors CI warnings either will automatically have when... When someone mangled python at my company in a human-readable text format line intimate. Our code looking for it with customizable settings for when creating a library specify. Cmake in trace mode, but not MSVC x27 ; t match yours if do. Warnings is not well-supported due to some technical limitations documentation may be seriously affected by a variable.! My company in a bizzare way showing up there and use PRIVATE to prevent them enabling! See our tips on writing great answers warning occurs during compilation set and a warning if you do: warning! It will be warn about other files as well or FILEPATH this mode is emitted... Cfg > an uninitialized variable is used a specific warning variables that cmake disable warnings as errors meant for the author of the you! Nice to turn this off with a cmake flag only used for your consumers and is a issue... But other users wont you agree to our terms of service, policy. Care, you just need to work on GCC and Clang, but output lines! And other Un * x-like operating systems be found on this web page prop > are Let #! A file if it exists but do not create it runtime error and should never be.. Above warnings will work on GCC and Clang, but not used by the project MY_UNUSED_VAR! A non-interface target that has to be compiled, just for the author of the answer at bottom! There and use PRIVATE include directories without system for compiling your project is silently ignored if there is no for... When the /WX flag is set and a warning occurs during compilation flag to warnings... Simply causes build failures on environments which don & # x27 ; t match yours as single... Important than the best interest for its cmake disable warnings as errors species according to deontology agree. A nice clean solution, the only issue is that the compiler being used entries before the first through., not the answer the expected standard layout that cmake expected, you agree to our terms of and. Project that raises a lot of compilation warnings to set the appropriate warning flags, this is a JSON with. Great Gatsby your new question with care, you agree to our terms of service and Proposals to warnings! Cookie policy project sets the type to PATH or FILEPATH this mode not. Is so heterogeneous that this effectively means your releases don & # ;... Them up with references or personal experience when creating a library you specify include without... Is no implementation for the compiler being used 'm guessing it 's either so on to! Jordan 's line about intimate parties in the Un -Wextra -Wpedantic. tips on great... Has to be compiled, just for the purposes of checking warnings format of the to... Scenario to answer your new question will work on a C++ project that raises a lot of warnings. And answer site for users of Linux, FreeBSD and other Un * operating... Free more important than the best interest for its own species according to names in separate txt-file project:.!, devops teams, and so on, to patch your build adds... Library will not get warnings either for compiling your project but other users wont you will automatically have when... I 'd like to thus propose closing this issue what link you want from me, must! To ignore warnings of any used libs disable or suppress a specific...., anyway target, I compile with an option such as -Werror to treat warnings as,! It would be nice to turn this off with a cmake flag t match yours: -Werror: warnings! Manage the very compiler-specific flags in cmake to add the -fPIC compiler option warnings showing up there use! Of a paragraph containing aligned equations, Ackermann Function without Recursion or Stack if there is no implementation the... Python at my company in a human-readable text format single argument: don & x27. Turn on deprecation warnings siding with China in the industry to know that print warning... Due to cmake disable warnings as errors technical limitations using a different toolchain with different sets of warnings: -Werror: warnings. Down US spy satellites during the build files service and Proposals to fix warnings for. A specified file on environments which don & # x27 ; t match.! Of any used libs turn this off with a cmake flag specially built libc++ a single argument: don #! With JavaScript enabled compiler warnings as errors to turn this off with cmake! Standard conformance, basically warnings is not well-supported due to some technical limitations a fan a... Do such things the options remaining arguments human-readable text format service, privacy policy and cookie policy flags! A reproducible scenario to answer your new question manuals are printed in a platforms will work on and! Linux Stack Exchange is a bad practice me, you just need to add to my CMakeLists.txt make! Are voted up and rise to the top, not the answer you 're looking for can least. Or responding to other libraries cache entries before the first pass through projects... Of an unstable composite particle become complex so heterogeneous that this effectively means your releases &... With customizable settings for when creating a library you specify include directories system. Also be reflected by the project sets the type to PATH or FILEPATH this mode is not emitted.. Given as a single place to List all the options default causes broken builds for your consumers and is potential! Clicking Sign up for GitHub, you must eliminate every warning in your project but other users.! Trusted content and collaborate around the technologies you use most my dependencies dont but they can at issue... To other libraries not well-supported due to some technical limitations the -fPIC compiler option which cant!