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The bug(s) which prevented LTO and partial linking from working with gcc have been fixed in my local version (9.3), and according to one of the original bug reports: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69866 A fix was committed in gcc version 8.1. The original code left in the SConstruct describing the problem with versions greated than 6.0 also enabled an -flinker-output option and set it to "rel". That option doesn't show up in the gcc 8.4 documentation even though it was added in 6.0, but in the 9.3 documentation it describes it and says that it defaults to "rel" when the -r (partial linking) option is used. This *should* mean that LTO and partial linking can be used together with no issues after version 8.1, and at most by version 9.3. If someone finds that that isn't true, then the range of bad versions can be expanded. Change-Id: Ie0529d077a0042ef55e2af995d01430d1695c031 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27131 Tested-by: Gem5 Cloud Project GCB service account <345032938727@cloudbuild.gserviceaccount.com> Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Gabe Black <gabeblack@google.com> Maintainer: Gabe Black <gabeblack@google.com>
This is the gem5 simulator. The main website can be found at http://www.gem5.org A good starting point is http://www.gem5.org/about, and for more information about building the simulator and getting started please see http://www.gem5.org/documentation and http://www.gem5.org/documentation/learning_gem5/introduction. To build gem5, you will need the following software: g++ or clang, Python (gem5 links in the Python interpreter), SCons, SWIG, zlib, m4, and lastly protobuf if you want trace capture and playback support. Please see http://www.gem5.org/documentation/general_docs/building for more details concerning the minimum versions of the aforementioned tools. Once you have all dependencies resolved, type 'scons build/<ARCH>/gem5.opt' where ARCH is one of ARM, NULL, MIPS, POWER, SPARC, or X86. This will build an optimized version of the gem5 binary (gem5.opt) for the the specified architecture. See http://www.gem5.org/documentation/general_docs/building for more details and options. The basic source release includes these subdirectories: - configs: example simulation configuration scripts - ext: less-common external packages needed to build gem5 - src: source code of the gem5 simulator - system: source for some optional system software for simulated systems - tests: regression tests - util: useful utility programs and files To run full-system simulations, you will need compiled system firmware (console and PALcode for Alpha), kernel binaries and one or more disk images. If you have questions, please send mail to gem5-users@gem5.org Enjoy using gem5 and please share your modifications and extensions.