de4487f848
When calling TryCompile with an empty string for the source, useful
when just testing a build flag, some versions of SCons will apparently
create some sort of equivalence between Value('') and Value(0). That
shows itself when creating config file headers, where Value(0) is
switched with Value(''), and the header defines a macro with which
expands to nothing rather than a macro which expands to 0. Later uses
of the macro of the form:
#if CONFIG_VARIABLE
fail because CONFIG_VARIABLE expands to nothing. If it expanded to 0
like it's supposed to, then the guarded block of code would be excluded
correctly.
Change-Id: Ie324ec5f8dd307c65745b9326a11230e10caa0bd
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/41213
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Gabe Black <gabe.black@gmail.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.