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In a more sophisticated project, the configure step might also test the availability of system functions (as a traditional Unix configure script would), or define a special “install” target (to help create a distributable package). Generates a header file demo-config.h in the binary folder, which will be included from C++ code.Finds the header files and libraries for SDL2 and OpenGL.For example, in our sample CMakeDemo project, the configure step also:
#GEANY MAKEFILE GENERATOR#
The type of build pipeline generated depends on the type of generator used, as explained in the following sections.Īdditional things may happen during the configure step, depending on the contents of CMakeLists.txt. If the configure step succeeds – meaning CMakeLists.txt completed without errors – CMake will generate a build pipeline using the targets defined by the script. Each target represents an executable, library, or some other output of the build pipeline. This script is responsible for defining targets. The CMakeLists.txt script is executed during the configure step. No matter how you run it, it performs two steps: the configure step and the generate step. The Configure and Generate StepsĪs you’ll see in the following sections, there are several ways to run CMake. Instead, simply re-run CMake each time you clone the project to a new folder. You aren’t meant to submit the generated build pipeline to source control, as it usually contains paths that are hardcoded to the local filesystem. (You can, and will, re-run CMake several times on the same binary folder.) Cache variables include user-configurable options defined by the project such as CMakeDemo’s DEMO_ENABLE_MULTISAMPLE option (explained later), and precomputed information to help speed up CMake runs. This is where cache variables are stored. It’s a single text file in the binary folder named CMakeCache.txt. You can even create several binary folders, side-by-side, that use different build systems or configuration options.
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A common practice is to create a subdirectory build beneath CMakeLists.txt.īy keeping the binary folder separate from the source, you can delete the binary folder at any time to get back to a clean slate. You can create the binary folder anywhere you want. The binary folder is where CMake generates the build pipeline. The source folder is the one containing CMakeLists.txt. To generate a build pipeline, CMake needs to know the source and binary folders. A build pipeline might be a Visual Studio. The Source and Binary FoldersĬMake generates build pipelines.
#GEANY MAKEFILE INSTALL#
You can also install it through MacPorts, Homebrew, Cygwin or MSYS2. In Unix-like environments, including Linux, it’s usually available through the system package manager.
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If you don’t have CMake yet, there are installers and binary distributions on the CMake website. However, I recommend reading the first two sections first.
#GEANY MAKEFILE UPDATE#
These changes are not required - if a maintainer decides to keep the conflicts for each FLAVOR explicit the patch in D31151 is never triggered.īut the patch for devel/git shows that the Makefile can be significantly simplified (the patch for DESCR is unrelated and could also be applied to other FLAVORed ports - I forgot to remove it).Īnother port that has a similarly complex CONFLICTS definition due to multiple FLAVORs is the proposed FLAVOR update of mail/postfix (see PR ports/255809).The information here applies to any CMake-based project, so feel free to skip ahead to any section. This review contains some 50 Makefiles that could be simplified after D31151 has been committed. The actual build conditions do not change, since the exclusion of the FLAVOR being built from the CONFLICTS definitions by the port's maintainer is just moved to the conflicts check logic. This allows to simplify the Makefiles, since a single CONFLICTS definition can now cover all FLAVORs. This lead to complexity and added effort to create and maintain those Makefiles.ĭifferential proposed changes to the conflicts checks in to ignore the FLAVOR being built. The introduction of FLAVORs required CONFLICTS entries for all except the selected FLAVOR to be added to the ports' Makefiles. I have prepared individual patches per maintainer (that I'd be happy to send by private mail) but did not want to open one review per maintainer and chose to go for this combined (not to be committed review) instead. I have added affected port maintainers that I could identify to this PR. I just wanted to outline the range of ports that can take advantage of D31151 and provide example patches to support the individual maintainers. Individual maintainers can apply the simplifications to their ports whenever it pleases them ( D31151 is a NOP on its own). This review is meant to support the patch suggested in D31151 - it is not meant to be committed as included!