[cmake-developers] New RelWithDebInfo flags?
Hi, I just discovered today that it looks like GCC 4.8 shipped with a new optimization level: -Og Optimize debugging experience. -Og enables optimizations that do not interfere with debugging. It should be the optimization level of choice for the standard edit-compile-debug cycle, offering a reasonable level of optimization while maintaining fast compilation and a good debugging experience. Would using this (if available) rather than -O2 in RelWithDebInfo configurations be something developers would want? Mailing list thread about the patch: https://gcc.gnu.org/ml/gcc-patches/2012-09/msg00097.html Thanks, --Ben -- Powered by www.kitware.com Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Kitware offers various services to support the CMake community. For more information on each offering, please visit: CMake Support: http://cmake.org/cmake/help/support.html CMake Consulting: http://cmake.org/cmake/help/consulting.html CMake Training Courses: http://cmake.org/cmake/help/training.html Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Follow this link to subscribe/unsubscribe: http://public.kitware.com/mailman/listinfo/cmake-developers
Re: [cmake-developers] New RelWithDebInfo flags?
- Original Message - Hi, I just discovered today that it looks like GCC 4.8 shipped with a new optimization level: -Og Optimize debugging experience. -Og enables optimizations that do not interfere with debugging. It should be the optimization level of choice for the standard edit-compile-debug cycle, offering a reasonable level of optimization while maintaining fast compilation and a good debugging experience. Would using this (if available) rather than -O2 in RelWithDebInfo configurations be something developers would want? Mailing list thread about the patch: https://gcc.gnu.org/ml/gcc-patches/2012-09/msg00097.html Perhaps not if people are using that configuration to build release binaries and stripping debug symbols from it. In my opinion, it *does* interfere with debugging, because of optimization done on stack variables. You may or may not be able to see their value at certain times. Its annoying enough that I go back to not having -Og for development, and have a separate build directory if I want optimization. The program flow while debugging is uninterrupted though, which is nice. Clint -- Powered by www.kitware.com Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Kitware offers various services to support the CMake community. For more information on each offering, please visit: CMake Support: http://cmake.org/cmake/help/support.html CMake Consulting: http://cmake.org/cmake/help/consulting.html CMake Training Courses: http://cmake.org/cmake/help/training.html Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Follow this link to subscribe/unsubscribe: http://public.kitware.com/mailman/listinfo/cmake-developers
Re: [cmake-developers] New RelWithDebInfo flags?
On Sat, Nov 22, 2014 at 10:12:22 -0700, clin...@elemtech.com wrote: Perhaps not if people are using that configuration to build release binaries and stripping debug symbols from it. Ah, true. Maybe it would be better for Debug than RelWithDebInfo? In my opinion, it *does* interfere with debugging, because of optimization done on stack variables. You may or may not be able to see their value at certain times. Its annoying enough that I go back to not having -Og for development, and have a separate build directory if I want optimization. Hrm. That's unfortunate. That's usually where my issues come in (though you can sometimes get their values by walking up or down the stack looking for unoptimized values which become those stack variables. The program flow while debugging is uninterrupted though, which is nice. Yeah, 'n' being unpredictable is annoying. Too easy to accidentally skip the important bits :( . --Ben -- Powered by www.kitware.com Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Kitware offers various services to support the CMake community. For more information on each offering, please visit: CMake Support: http://cmake.org/cmake/help/support.html CMake Consulting: http://cmake.org/cmake/help/consulting.html CMake Training Courses: http://cmake.org/cmake/help/training.html Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Follow this link to subscribe/unsubscribe: http://public.kitware.com/mailman/listinfo/cmake-developers
