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gcc uses "make" to parallelize LTO. If we're using gcc and make isn't found, we have to use single threaded LTO instead. A warning will let the user know what's happening and that they might want to correct the situation. Technically gcc can use the MAKE environment variable to override the program it uses, although I assume it still has to be "make" compatible. Given the fairly low likelihood that someone will need that override and the fact that scons won't pipe that variable through unless we plumb it up, we'll just ignore that for now. Change-Id: I891b213ece2a75bd8a915ee91f4130458dab397b Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/41773 Reviewed-by: Earl Ou <shunhsingou@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, 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.