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. Tests.cpp:(.text.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 Tests.cpp:(.text._ZN7testing8internal11CmpHelperEQIidEENS_15AssertionResultEPKcS4_RKT_RKT0_+0x9b): undefined reference to `testing::internal::EqFailure(char const*, char const*, testing::internal::String const&, testing::internal::String const&, bool)’ĬMakeFiles/runTests.dir/: In function `testing::AssertionResult testing::internal::CmpHelperEQ(char const*, char const*, double const&, double const&)’: I got some reference error while execute “make” command.ĬMakeFiles/runTests.dir/: In function `testing::AssertionResult testing::internal::CmpHelperEQ(char const*, char const*, int const&, double const&)’: rw-r–r– 1 root root 175 Sep 18 18:33 whattotest.cpp rw-r–r– 1 root root 296 Sep 19 14:48 CMakeLists.txt rw-r–r– 1 root root 1579 Sep 18 18:40 cmake_install.cmake rw-r–r– 1 root root 1552 Sep 18 18:12 cmake_install.cmake Makefile:129: recipe for target ‘all’ failedĭrwxr-xr-x 6 root root 4096 Sep 18 18:29. tests.cpp #include "whattotest.cpp" #include ĪSSERT_EQ ( 18.0, squareRoot ( 324.0 ) ) ĪSSERT_EQ ( 25.4, squareRoot ( 645.16 ) ) ĪSSERT_EQ ( - 1.0, squareRoot ( - 15.0 ) ) ĪSSERT_EQ ( - 1.0, squareRoot ( - 0.2 ) ) } int main ( int argc, char **argv ) ’ ĬMakeFiles/Makefile2:187: recipe for target ‘CMakeFiles/FAST.dir/all’ failed
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