#40648: cmake @2.8.11.2 does not set optimization flags in release -------------------------+---------------------- Reporter: macports@… | Owner: css@… Type: defect | Status: assigned Priority: Normal | Milestone: Component: ports | Version: Resolution: | Keywords: Port: cmake | -------------------------+---------------------- Comment (by Torsten.Maehne@…): As a regular CMake user, I'm also affected by this annoying issue. Therefore, I had a look to the CMake port group to fix the issue with the following uploaded patches: {{{0001-Fix-the-CMake-port-specific-part-of-ticket-40648.patch}}} Fix the CMake-port-specific part of this ticket. This reverts the changes made to the CMake Portfile in r110069 so that ports, which are configured by CMake, honor the configure.optflags set in the Portfile. Thus, Release builds are compiled with optimization by default again. {{{0002-Improve-CMake-PortGroup-to-handle-the-configure-flags.patch}}} Improve the CMake PortGroup so that it handles the configure.*flags. The configure.cppflags, configure.optflags, configure.cflags, configure.cxxflags, configure.ldflags are handled by setting the equivalent CMAKE_*_FLAGS. The configure.cppflags are added to the C/C++ compiler flags as CMake does not honor separately CPPFLAGS (it uses usually add_definitions() for that). The compiler flags for all build types (CMAKE_C_FLAGS, CMAKE_CXX_FLAGS) are used, as they are usually empty. Cf. also to CMake upstream ticket #12928 "CMake silently ignores CPPFLAGS" <http://www.cmake.org/Bug/view.php?id=12928>. The configure.cflags contain configure.optflags by default. Therefore, they are set via the Release flags CMAKE_C_FLAGS_RELEASE, which would otherwise overrule the optimization flags, as they are set by default to "-O3 -NDEBUG". Therefore, be sure to add "-NDEBUG" to the configure.cflags if you want to turn off assertions in release builds! The configure.cxxflags contain configure.optflags by default. Therefore, they are set via the Release flags CMAKE_CXX_FLAGS_RELEASE, which would otherwise overrule the optimization flags, as they are set by default to "-O3 -NDEBUG". Therefore, be sure to add "-NDEBUG" to the configure.cflags if you want to turn off assertions in release builds! A port author has to be aware that a CMake script can always override these flags when it runs, as they are frequently set internally in function of other CMake build variables! Attention: If the port author wants to be sure that no compiler flags are passed via configure.args to CMake, he has to set manually configure.optflags to "", as it is by default "-O2" and added to all language-specific flags. If he wants to prevent optimization, he should set configure.optflags to "-O0". TODO: Handle the compiler flags specific to Objective-C, Fortran, and Java in the CMake PortGroup. This patch does not fix the issue in the case of selecting the +debug variant of the CMake PortGroup for which two additional patches are necessary: {{{0003-Fix-CMake-PortGroup-debug-variant.patch}}} Change the CMAKE_BUILD_TYPE to Debug instead of debugFull for the +debug variant in the CMake PortGroup. "debugFull" is not a standard build type in CMake so there are no default compiler flags set for it, which would turn on the inclusion of debug symbols. Instead, CMake provides the build type "Debug" for this purpose. Only KDE provides in its CMake build infrastructure support for a build type called "DebugFull", which turns off optimization, as KDE leaves it on for the "Debug" build type. Confer to <http://techbase.kde.org/Development/CMake/Addons_for_KDE> for further explanations. {{{0004-Handle-configure.cflags-and-configure.cxxflags-in-debug-variant- of-CMake-PortGroup.patch}}} Consider the configure.cflags and configure.cxxflags for +debug variant of the CMake PortsGroup. The CMAKE_BUILD_TYPE "Debug" uses CMAKE_C_FLAGS_DEBUG and CMAKE_CXX_FLAGS_DEBUG to specify the compiler flags. These variables are set to "-g" plus the respective configure.cflags and configure.cxxflags. Be aware that configure.cflags and configure.cxxflags contain configure.optflags by default, which are not deleted for the Debug build. The port author has to set configure.optflags to "-O0" to turn off optimization. Please have a look on it and test it with the ports, which motivated the change in r110069 in the first place. I don't have commit rights to apply these changes to the MacPorts SVN. -- Ticket URL: <https://trac.macports.org/ticket/40648#comment:15> MacPorts <http://www.macports.org/> Ports system for OS X