![]() Generally speaking, using the -DCMAKE_BUILD_TYPE=None option is better than omitting the usage of CMAKE_BUILD_TYPE. Since the default None build type does not append any flags to CFLAGS and CXXFLAGS by default, using the -DCMAKE_BUILD_TYPE=None option can also work. Also be aware of possible references to source files in the resulting package and the corresponding makepkg's WARNING: Package contains reference to $srcdir caused by a missing NDEBUG definition in the None build type. But note that omitting this option is not guaranteed to fix the problem, as many software projects automatically set the build type to Release (or other type) in the CMake files if CMAKE_BUILD_TYPE is not set at command line. The default CMake build type is None and it does not append any flags to CFLAGS and CXXFLAGS by default, so simply omitting the usage of the CMAKE_BUILD_TYPE option can work as it will default to None. This section will discuss possible solutions and some points that should be observed. Please note that there is no standard solution that can be applied to all cases. Unless you know exactly what you are doing, or if upstream explicitly tells or implies that -O3 is needed, we should avoid using it in our packages.įixing the automatic optimization flag overrideįixing this in a 100% guaranteed way is not a simple question due to CMake flexibility. ![]() There is a good reason why the Arch Linux developers choose -O2 as the target optimization level and we should stick with it. It can also break software in some situations. Using -O3 does not guarantee that the software will perform better, and sometimes it can even slow down the program. ![]() This is undesired, as it deviates from the Arch Linux targeted optimization level. When using the common Release build type, it automatically appends the -O3 compiler optimization flag, and this overrides the default Arch Linux flag which currently is -O2 (defined in the makepkg configuration file). Some upstream projects even inadvertently include this option in their building instructions, but this produces an undesired behavior.Įach build type causes CMake to automatically append a set of flags to CFLAGS and CXXFLAGS. It is very common to see people running CMake with the -DCMAKE_BUILD_TYPE=Release option. Being such, some steps should be noted when writing PKGBUILDs for CMake-based software.ĬMake can automatically override the default compiler optimization flag The cmake command usually sets some parameters, checks for the needed dependencies and creates the build files, letting the software ready to be built by other tools like make and ninja.ĭue to its own internal characteristics for generating the build files, sometimes CMake can behave in undesired ways. The typical usage consists of running the cmake command and after that execute the building command. ![]() CMake is used to control the software compilation process using simple platform and compiler independent configuration files, and generate native makefiles and workspaces that can be used in the compiler environment of your choice. This document covers standards and guidelines on writing PKGBUILDs for software that uses cmake.ĬMake is an open-source, cross-platform family of tools designed to build, test and package software. 32-bit – CLR – CMake – Cross – DKMS – Eclipse – Electron – Font – Free Pascal – GNOME – Go – Haskell – Java – KDE – Kernel – Lisp – Meson – MinGW – Node.js – Nonfree – OCaml – Perl – PHP – Python – R – Ruby – Rust – Shell – VCS – Web – Wine
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