Is far easier to know and limit the impact of implementation dependencies whenĪ program is written than to try to untangle the mess afterwards. When running the CMake configuration command, its recommended to explicitly specify the desired build file generator with the -G option. Your favorite compiler may do some things differently from the current one. Alternatively, you can set up the channels correctly for use with bioconda. In addition, programs often need to beĬompiled with other compilers for the same system, and even a future release of Likely to be ported, so someone will have to find and fix problems related to Portability usually do so because they use only a single system and feel theyĬan afford the attitude that ‘‘the language is what my compiler implements.’’ Variety of compilers care a lot because if they don’t, they are forced to waste Why should you bother? People who program on a variety of systems or use a Some quote from a nice book of a nice guy you probably know (emphasis mine): Thank you! :) You save a day for one programmer. target_compile_definitions(MyTarget PUBLIC "$:MYDEBUG_MACRO>") Message("Generated with config types: $ -my-debug-flags") Just define CMAKE_CONFIGURATION_TYPES: # Somewhere in CMakeLists.txt You can use -config options to switch: > cmake -build _builds -config Release This is because all the configurations is internal (i.e., _builds/msvc-opaque/Release and _builds/msvc-opaque/Debug or something, doesn't matter). B_builds -DCMAKE_BUILD_TYPE=Release "-GVisual StuWin64" B_builds -DCMAKE_BUILD_TYPE=Debug "-GVisual StuWin64"Īnd > cmake -H. > cmake -build _builds/Debug -config Release # yep, ignoredĬMAKE_BUILD_TYPE on generate step is ignored, both: > cmake -H. > cmake -build _builds/Debug -config Debug # `-config` ignored In this case, the build step is always Debug: > cmake -build _builds/Debug Switch the default build generator on any platform by setting environment variable CMAKEGENERATOR. In general many projects can benefit from increased build speed and especially rebuild speed of Ninja. The default CMake build generator is operating system dependent. created by the execution of commands such as addcustomcommand () which run during the build. Switch CMake Generator to Ninja 28 March, 2020. This information is then used to exempt the file from any existence or validity checks. B_builds/Debug -DCMAKE_BUILD_TYPE=Debug "-GUnix Makefiles" Tells the internal CMake engine that a source file is generated by an outside process such as another build step, or the execution of CMake itself. You set the configuration type in the generate step: cmake -H. Make-like generators: Unix Makefiles, NMake Makefiles, MinGW Makefiles. set diagnostics:caret from CMakeLists.There are two types of generators: single-configurations and multi-configurations.Visual C++ Team Blog: CMake support in Visual Studio – the Visual Studio 2017 RC update.String(REGEX REPLACE "/W" "/W4" CMAKE_CXX_FLAGS "$\\VS2017Toolchain.cmake\"", You should set the environment variable CMAKEGENERATOR to Ninja. CMake does not provide any immediate support for this, and the standard solution (as this Q&A suggests) seems to be: if(CMAKE_CXX_FLAGS MATCHES "/W") To work around this, I would need to replace any incompatible compiler option(s) instead of just adding one. The command line passed to the compiler now contains both /W4 (as intended) as well as /W3 (picked up from somewhere else), producing the following warning: cl : Command line warning D9025: overriding '/W3' with '/W4' The obvious solution add_compile_options("/W4")ĭidn't pan out as expected. Is it possible to set the default generator cmake uses so it is not necessary to specify it at the command line Right now, on my windows I would like it to be 'Visual Studio 9 2008'. In my case I was attempting to set the warning level to 4. Trying to set compiler options, on the other hand, turned out to be anything but trivial. This properly generates build scripts, and compiles and links with no issues. To learn about this combination, I was starting with this basic sample: # CMakeLists.txt Visual Studio 2017 comes with full CMake integration. CMake Generators are platform-specific so each may be available only on certain platforms.
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