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Sometimes a library is needed to support particular functionality in gem5, and that functionality is only used (or even desirable) in certain binaries SCons can build. We can currently filter sources to include in a particular executable using tags, but libraries have been added to the environment globally using the LIBS variable which applies to all Executables. This change adds a SourceLib() mechanism which is a new category of source which represents libraries. This is independent from classes which inherit from SourceFile which represent actual files, as opposed to more abstract libraries. When gem5 builds an executable, the filters it provides are used to select both Source()-es, aka c/c++ files, and libraries. If something like a unit test does not need all the libraries gem5 proper does, then those won't be picked up by its filter, and it won't include them. Change-Id: I003e029eb82f7800a7ecff698c260e2d18ea2900 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/58069 Reviewed-by: Yu-hsin Wang <yuhsingw@google.com> Maintainer: Gabe Black <gabe.black@gmail.com> Tested-by: kokoro <noreply+kokoro@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, 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 these tools. Once you have all dependencies resolved, type 'scons build/<CONFIG>/gem5.opt' where CONFIG is one of the options in build_opts like ARM, NULL, MIPS, POWER, SPARC, X86, Garnet_standalone, etc. This will build an optimized version of the gem5 binary (gem5.opt) with the the specified configuration. See http://www.gem5.org/documentation/general_docs/building for more details and options. The main source tree includes these subdirectories: - build_opts: pre-made default configurations for gem5 - build_tools: tools used internally by gem5's build process. - configs: example simulation configuration scripts - ext: less-common external packages needed to build gem5 - include: include files for use in other programs - site_scons: modular components of the build system - 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 may need compiled system firmware, kernel binaries and one or more disk images, depending on gem5's configuration and what type of workload you're trying to run. Many of those resources can be downloaded from http://resources.gem5.org, and/or from the git repository here: https://gem5.googlesource.com/public/gem5-resources/ If you have questions, please send mail to gem5-users@gem5.org Enjoy using gem5 and please share your modifications and extensions.