3 # Copyright (c) 2013, 2015-2020 ARM Limited
6 # The license below extends only to copyright in the software and shall
7 # not be construed as granting a license to any other intellectual
8 # property including but not limited to intellectual property relating
9 # to a hardware implementation of the functionality of the software
10 # licensed hereunder. You may use the software subject to the license
11 # terms below provided that you ensure that this notice is replicated
12 # unmodified and in its entirety in all distributions of the software,
13 # modified or unmodified, in source code or in binary form.
15 # Copyright (c) 2011 Advanced Micro Devices, Inc.
16 # Copyright (c) 2009 The Hewlett-Packard Development Company
17 # Copyright (c) 2004-2005 The Regents of The University of Michigan
18 # All rights reserved.
20 # Redistribution and use in source and binary forms, with or without
21 # modification, are permitted provided that the following conditions are
22 # met: redistributions of source code must retain the above copyright
23 # notice, this list of conditions and the following disclaimer;
24 # redistributions in binary form must reproduce the above copyright
25 # notice, this list of conditions and the following disclaimer in the
26 # documentation and/or other materials provided with the distribution;
27 # neither the name of the copyright holders nor the names of its
28 # contributors may be used to endorse or promote products derived from
29 # this software without specific prior written permission.
31 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
34 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
36 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
37 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
38 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
39 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
40 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
41 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
43 ###################################################
45 # SCons top-level build description (SConstruct) file.
47 # While in this directory ('gem5'), just type 'scons' to build the default
48 # configuration (see below), or type 'scons build/<CONFIG>/<binary>'
49 # to build some other configuration (e.g., 'build/X86/gem5.opt' for
50 # the optimized full-system version).
52 # You can build gem5 in a different directory as long as there is a
53 # 'build/<CONFIG>' somewhere along the target path. The build system
54 # expects that all configs under the same build directory are being
55 # built for the same host system.
59 # The following two commands are equivalent. The '-u' option tells
60 # scons to search up the directory tree for this SConstruct file.
61 # % cd <path-to-src>/gem5 ; scons build/X86/gem5.debug
62 # % cd <path-to-src>/gem5/build/X86; scons -u gem5.debug
64 # The following two commands are equivalent and demonstrate building
65 # in a directory outside of the source tree. The '-C' option tells
66 # scons to chdir to the specified directory to find this SConstruct
68 # % cd <path-to-src>/gem5 ; scons /local/foo/build/X86/gem5.debug
69 # % cd /local/foo/build/X86; scons -C <path-to-src>/gem5 gem5.debug
71 # You can use 'scons -H' to print scons options. If you're in this
72 # 'gem5' directory (or use -u or -C to tell scons where to find this
73 # file), you can use 'scons -h' to print all the gem5-specific build
76 ###################################################
78 from __future__
import print_function
80 # Global Python includes
89 from os
import mkdir
, environ
90 from os
.path
import abspath
, basename
, dirname
, expanduser
, normpath
91 from os
.path
import exists
, isdir
, isfile
92 from os
.path
import join
as joinpath
, split
as splitpath
100 from m5
.util
import compareVersions
, readCommand
, readCommandWithReturn
111 # There's a bug in scons in that (1) by default, the help texts from
112 # AddOption() are supposed to be displayed when you type 'scons -h'
113 # and (2) you can override the help displayed by 'scons -h' using the
114 # Help() function, but these two features are incompatible: once
115 # you've overridden the help text using Help(), there's no way to get
116 # at the help texts from AddOptions. See:
117 # http://scons.tigris.org/issues/show_bug.cgi?id=2356
118 # http://scons.tigris.org/issues/show_bug.cgi?id=2611
119 # This hack lets us extract the help text from AddOptions and
120 # re-inject it via Help(). Ideally someday this bug will be fixed and
121 # we can just use AddOption directly.
122 def AddLocalOption(*args
, **kwargs
):
125 help = " " + ", ".join(args
)
128 if length
>= col_width
:
129 help += "\n" + " " * col_width
131 help += " " * (col_width
- length
)
132 help += kwargs
["help"]
133 help_texts
["options"] += help + "\n"
135 AddOption(*args
, **kwargs
)
137 AddLocalOption('--colors', dest
='use_colors', action
='store_true',
138 help="Add color to abbreviated scons output")
139 AddLocalOption('--no-colors', dest
='use_colors', action
='store_false',
140 help="Don't add color to abbreviated scons output")
141 AddLocalOption('--with-cxx-config', dest
='with_cxx_config',
143 help="Build with support for C++-based configuration")
144 AddLocalOption('--default', dest
='default', type='string', action
='store',
145 help='Override which build_opts file to use for defaults')
146 AddLocalOption('--ignore-style', dest
='ignore_style', action
='store_true',
147 help='Disable style checking hooks')
148 AddLocalOption('--gold-linker', dest
='gold_linker', action
='store_true',
149 help='Use the gold linker')
150 AddLocalOption('--no-lto', dest
='no_lto', action
='store_true',
151 help='Disable Link-Time Optimization for fast')
152 AddLocalOption('--force-lto', dest
='force_lto', action
='store_true',
153 help='Use Link-Time Optimization instead of partial linking' +
154 ' when the compiler doesn\'t support using them together.')
155 AddLocalOption('--update-ref', dest
='update_ref', action
='store_true',
156 help='Update test reference outputs')
157 AddLocalOption('--verbose', dest
='verbose', action
='store_true',
158 help='Print full tool command lines')
159 AddLocalOption('--without-python', dest
='without_python',
161 help='Build without Python configuration support')
162 AddLocalOption('--without-tcmalloc', dest
='without_tcmalloc',
164 help='Disable linking against tcmalloc')
165 AddLocalOption('--with-ubsan', dest
='with_ubsan', action
='store_true',
166 help='Build with Undefined Behavior Sanitizer if available')
167 AddLocalOption('--with-asan', dest
='with_asan', action
='store_true',
168 help='Build with Address Sanitizer if available')
169 AddLocalOption('--with-systemc-tests', dest
='with_systemc_tests',
170 action
='store_true', help='Build systemc tests')
172 from gem5_scons
import Transform
, error
, warning
, summarize_warnings
174 if GetOption('no_lto') and GetOption('force_lto'):
175 error('--no-lto and --force-lto are mutually exclusive')
177 ########################################################################
179 # Set up the main build environment.
181 ########################################################################
185 from gem5_scons
.util
import get_termcap
186 termcap
= get_termcap()
188 main_dict_keys
= main
.Dictionary().keys()
190 # Check that we have a C/C++ compiler
191 if not ('CC' in main_dict_keys
and 'CXX' in main_dict_keys
):
192 error("No C++ compiler installed (package g++ on Ubuntu and RedHat)")
194 ###################################################
196 # Figure out which configurations to set up based on the path(s) of
199 ###################################################
201 # Find default configuration & binary.
202 Default(environ
.get('M5_DEFAULT_BINARY', 'build/ARM/gem5.debug'))
204 # helper function: find last occurrence of element in list
205 def rfind(l
, elt
, offs
= -1):
206 for i
in range(len(l
)+offs
, 0, -1):
209 raise ValueError("element not found")
211 # Take a list of paths (or SCons Nodes) and return a list with all
212 # paths made absolute and ~-expanded. Paths will be interpreted
213 # relative to the launch directory unless a different root is provided
214 def makePathListAbsolute(path_list
, root
=GetLaunchDir()):
215 return [abspath(joinpath(root
, expanduser(str(p
))))
218 # Each target must have 'build' in the interior of the path; the
219 # directory below this will determine the build parameters. For
220 # example, for target 'foo/bar/build/X86/arch/x86/blah.do' we
221 # recognize that X86 specifies the configuration because it
222 # follow 'build' in the build path.
224 # The funky assignment to "[:]" is needed to replace the list contents
225 # in place rather than reassign the symbol to a new list, which
226 # doesn't work (obviously!).
227 BUILD_TARGETS
[:] = makePathListAbsolute(BUILD_TARGETS
)
229 # Generate a list of the unique build roots and configs that the
230 # collected targets reference.
233 for t
in BUILD_TARGETS
:
234 path_dirs
= t
.split('/')
236 build_top
= rfind(path_dirs
, 'build', -2)
238 error("No non-leaf 'build' dir found on target path.", t
)
239 this_build_root
= joinpath('/',*path_dirs
[:build_top
+1])
241 build_root
= this_build_root
243 if this_build_root
!= build_root
:
244 error("build targets not under same build root\n"
245 " %s\n %s" % (build_root
, this_build_root
))
246 variant_path
= joinpath('/',*path_dirs
[:build_top
+2])
247 if variant_path
not in variant_paths
:
248 variant_paths
.append(variant_path
)
250 # Make sure build_root exists (might not if this is the first build there)
251 if not isdir(build_root
):
253 main
['BUILDROOT'] = build_root
257 main
.SConsignFile(joinpath(build_root
, "sconsign"))
259 # Default duplicate option is to use hard links, but this messes up
260 # when you use emacs to edit a file in the target dir, as emacs moves
261 # file to file~ then copies to file, breaking the link. Symbolic
262 # (soft) links work better.
263 main
.SetOption('duplicate', 'soft-copy')
266 # Set up global sticky variables... these are common to an entire build
267 # tree (not specific to a particular build like X86)
270 global_vars_file
= joinpath(build_root
, 'variables.global')
272 global_vars
= Variables(global_vars_file
, args
=ARGUMENTS
)
274 global_vars
.AddVariables(
275 ('CC', 'C compiler', environ
.get('CC', main
['CC'])),
276 ('CXX', 'C++ compiler', environ
.get('CXX', main
['CXX'])),
277 ('CCFLAGS_EXTRA', 'Extra C and C++ compiler flags', ''),
278 ('LDFLAGS_EXTRA', 'Extra linker flags', ''),
279 ('MARSHAL_CCFLAGS_EXTRA', 'Extra C and C++ marshal compiler flags', ''),
280 ('MARSHAL_LDFLAGS_EXTRA', 'Extra marshal linker flags', ''),
281 ('PYTHON_CONFIG', 'Python config binary to use',
282 [ 'python2.7-config', 'python-config', 'python3-config' ]),
283 ('PROTOC', 'protoc tool', environ
.get('PROTOC', 'protoc')),
284 ('BATCH', 'Use batch pool for build and tests', False),
285 ('BATCH_CMD', 'Batch pool submission command name', 'qdo'),
286 ('M5_BUILD_CACHE', 'Cache built objects in this directory', False),
287 ('EXTRAS', 'Add extra directories to the compilation', '')
290 # Update main environment with values from ARGUMENTS & global_vars_file
291 global_vars
.Update(main
)
292 help_texts
["global_vars"] += global_vars
.GenerateHelpText(main
)
294 # Save sticky variable settings back to current variables file
295 global_vars
.Save(global_vars_file
, main
)
297 # Parse EXTRAS variable to build list of all directories where we're
298 # look for sources etc. This list is exported as extras_dir_list.
299 base_dir
= main
.srcdir
.abspath
301 extras_dir_list
= makePathListAbsolute(main
['EXTRAS'].split(':'))
306 Export('extras_dir_list')
308 # the ext directory should be on the #includes path
309 main
.Append(CPPPATH
=[Dir('ext')])
311 # Add shared top-level headers
312 main
.Prepend(CPPPATH
=Dir('include'))
314 if GetOption('verbose'):
315 def MakeAction(action
, string
, *args
, **kwargs
):
316 return Action(action
, *args
, **kwargs
)
319 main
['CCCOMSTR'] = Transform("CC")
320 main
['CXXCOMSTR'] = Transform("CXX")
321 main
['ASCOMSTR'] = Transform("AS")
322 main
['ARCOMSTR'] = Transform("AR", 0)
323 main
['LINKCOMSTR'] = Transform("LINK", 0)
324 main
['SHLINKCOMSTR'] = Transform("SHLINK", 0)
325 main
['RANLIBCOMSTR'] = Transform("RANLIB", 0)
326 main
['M4COMSTR'] = Transform("M4")
327 main
['SHCCCOMSTR'] = Transform("SHCC")
328 main
['SHCXXCOMSTR'] = Transform("SHCXX")
331 # Initialize the Link-Time Optimization (LTO) flags
332 main
['LTO_CCFLAGS'] = []
333 main
['LTO_LDFLAGS'] = []
335 # According to the readme, tcmalloc works best if the compiler doesn't
336 # assume that we're using the builtin malloc and friends. These flags
337 # are compiler-specific, so we need to set them after we detect which
338 # compiler we're using.
339 main
['TCMALLOC_CCFLAGS'] = []
341 CXX_version
= readCommand([main
['CXX'],'--version'], exception
=False)
342 CXX_V
= readCommand([main
['CXX'],'-V'], exception
=False)
344 main
['GCC'] = CXX_version
and CXX_version
.find('g++') >= 0
345 main
['CLANG'] = CXX_version
and CXX_version
.find('clang') >= 0
346 if main
['GCC'] + main
['CLANG'] > 1:
347 error('Two compilers enabled at once?')
349 # Set up default C++ compiler flags
350 if main
['GCC'] or main
['CLANG']:
351 # As gcc and clang share many flags, do the common parts here
352 main
.Append(CCFLAGS
=['-pipe'])
353 main
.Append(CCFLAGS
=['-fno-strict-aliasing'])
354 # Enable -Wall and -Wextra and then disable the few warnings that
355 # we consistently violate
356 main
.Append(CCFLAGS
=['-Wall', '-Wundef', '-Wextra',
357 '-Wno-sign-compare', '-Wno-unused-parameter'])
358 # We always compile using C++11
359 main
.Append(CXXFLAGS
=['-std=c++11'])
360 if sys
.platform
.startswith('freebsd'):
361 main
.Append(CCFLAGS
=['-I/usr/local/include'])
362 main
.Append(CXXFLAGS
=['-I/usr/local/include'])
364 # On Mac OS X/Darwin the default linker doesn't support the
366 if sys
.platform
!= "darwin":
367 main
.Append(LINKFLAGS
='-Wl,--as-needed')
368 main
['FILTER_PSHLINKFLAGS'] = lambda x
: str(x
).replace(' -shared', '')
369 main
['PSHLINKFLAGS'] = main
.subst('${FILTER_PSHLINKFLAGS(SHLINKFLAGS)}')
370 if GetOption('gold_linker'):
371 main
.Append(LINKFLAGS
='-fuse-ld=gold')
372 main
['PLINKFLAGS'] = main
.get('LINKFLAGS')
373 shared_partial_flags
= ['-r', '-nostdlib']
374 main
.Append(PSHLINKFLAGS
=shared_partial_flags
)
375 main
.Append(PLINKFLAGS
=shared_partial_flags
)
377 # Treat warnings as errors but white list some warnings that we
378 # want to allow (e.g., deprecation warnings).
379 main
.Append(CCFLAGS
=['-Werror',
380 '-Wno-error=deprecated-declarations',
381 '-Wno-error=deprecated',
385 "Don't know what compiler options to use for your compiler.",
386 "compiler: " + main
['CXX'],
387 "version: " + CXX_version
.replace('\n', '<nl>') if
388 CXX_version
else 'COMMAND NOT FOUND!',
389 "If you're trying to use a compiler other than GCC",
390 "or clang, there appears to be something wrong with your",
393 "If you are trying to use a compiler other than those listed",
394 "above you will need to ease fix SConstruct and ",
395 "src/SConscript to support that compiler.")))
398 # Check for a supported version of gcc. >= 4.8 is chosen for its
399 # level of c++11 support. See
400 # http://gcc.gnu.org/projects/cxx0x.html for details.
401 gcc_version
= readCommand([main
['CXX'], '-dumpversion'], exception
=False)
402 if compareVersions(gcc_version
, "4.8") < 0:
403 error('gcc version 4.8 or newer required.\n'
404 'Installed version:', gcc_version
)
407 main
['GCC_VERSION'] = gcc_version
409 if compareVersions(gcc_version
, '4.9') >= 0:
410 # Incremental linking with LTO is currently broken in gcc versions
411 # 4.9 and above. A version where everything works completely hasn't
412 # yet been identified.
414 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67548
415 main
['BROKEN_INCREMENTAL_LTO'] = True
416 if compareVersions(gcc_version
, '6.0') >= 0:
417 # gcc versions 6.0 and greater accept an -flinker-output flag which
418 # selects what type of output the linker should generate. This is
419 # necessary for incremental lto to work, but is also broken in
420 # current versions of gcc. It may not be necessary in future
421 # versions. We add it here since it might be, and as a reminder that
422 # it exists. It's excluded if lto is being forced.
424 # https://gcc.gnu.org/gcc-6/changes.html
425 # https://gcc.gnu.org/ml/gcc-patches/2015-11/msg03161.html
426 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69866
427 if not GetOption('force_lto'):
428 main
.Append(PSHLINKFLAGS
='-flinker-output=rel')
429 main
.Append(PLINKFLAGS
='-flinker-output=rel')
431 disable_lto
= GetOption('no_lto')
432 if not disable_lto
and main
.get('BROKEN_INCREMENTAL_LTO', False) and \
433 not GetOption('force_lto'):
434 warning('Your compiler doesn\'t support incremental linking and lto '
435 'at the same time, so lto is being disabled. To force lto on '
436 'anyway, use the --force-lto option. That will disable '
440 # Add the appropriate Link-Time Optimization (LTO) flags
441 # unless LTO is explicitly turned off. Note that these flags
442 # are only used by the fast target.
444 # Pass the LTO flag when compiling to produce GIMPLE
445 # output, we merely create the flags here and only append
447 main
['LTO_CCFLAGS'] = ['-flto=%d' % GetOption('num_jobs')]
449 # Use the same amount of jobs for LTO as we are running
451 main
['LTO_LDFLAGS'] = ['-flto=%d' % GetOption('num_jobs')]
453 main
.Append(TCMALLOC_CCFLAGS
=['-fno-builtin-malloc', '-fno-builtin-calloc',
454 '-fno-builtin-realloc', '-fno-builtin-free'])
457 # Check for a supported version of clang, >= 3.1 is needed to
458 # support similar features as gcc 4.8. See
459 # http://clang.llvm.org/cxx_status.html for details
460 clang_version_re
= re
.compile(".* version (\d+\.\d+)")
461 clang_version_match
= clang_version_re
.search(CXX_version
)
462 if (clang_version_match
):
463 clang_version
= clang_version_match
.groups()[0]
464 if compareVersions(clang_version
, "3.1") < 0:
465 error('clang version 3.1 or newer required.\n'
466 'Installed version:', clang_version
)
468 error('Unable to determine clang version.')
470 # clang has a few additional warnings that we disable, extraneous
471 # parantheses are allowed due to Ruby's printing of the AST,
472 # finally self assignments are allowed as the generated CPU code
474 main
.Append(CCFLAGS
=['-Wno-parentheses',
476 # Some versions of libstdc++ (4.8?) seem to
477 # use struct hash and class hash
479 '-Wno-mismatched-tags',
481 if compareVersions(clang_version
, "10.0") >= 0:
482 main
.Append(CCFLAGS
=['-Wno-c99-designator'])
484 if compareVersions(clang_version
, "8.0") >= 0:
485 main
.Append(CCFLAGS
=['-Wno-defaulted-function-deleted'])
487 main
.Append(TCMALLOC_CCFLAGS
=['-fno-builtin'])
489 # On Mac OS X/Darwin we need to also use libc++ (part of XCode) as
490 # opposed to libstdc++, as the later is dated.
491 if sys
.platform
== "darwin":
492 main
.Append(CXXFLAGS
=['-stdlib=libc++'])
493 main
.Append(LIBS
=['c++'])
495 # On FreeBSD we need libthr.
496 if sys
.platform
.startswith('freebsd'):
497 main
.Append(LIBS
=['thr'])
499 # Add sanitizers flags
501 if GetOption('with_ubsan'):
502 # Only gcc >= 4.9 supports UBSan, so check both the version
503 # and the command-line option before adding the compiler and
505 if not main
['GCC'] or compareVersions(main
['GCC_VERSION'], '4.9') >= 0:
506 sanitizers
.append('undefined')
507 if GetOption('with_asan'):
508 # Available for gcc >= 4.8 or llvm >= 3.1 both a requirement
509 # by the build system
510 sanitizers
.append('address')
511 suppressions_file
= Dir('util').File('lsan-suppressions').get_abspath()
512 suppressions_opt
= 'suppressions=%s' % suppressions_file
513 main
['ENV']['LSAN_OPTIONS'] = ':'.join([suppressions_opt
,
514 'print_suppressions=0'])
516 warning('To suppress false positive leaks, set the LSAN_OPTIONS '
517 'environment variable to "%s" when running gem5' %
519 warning('LSAN_OPTIONS=suppressions=%s' % suppressions_opt
)
522 sanitizers
= ','.join(sanitizers
)
523 if main
['GCC'] or main
['CLANG']:
524 main
.Append(CCFLAGS
=['-fsanitize=%s' % sanitizers
,
525 '-fno-omit-frame-pointer'],
526 LINKFLAGS
='-fsanitize=%s' % sanitizers
)
528 warning("Don't know how to enable %s sanitizer(s) for your "
529 "compiler." % sanitizers
)
531 # Set up common yacc/bison flags (needed for Ruby)
532 main
['YACCFLAGS'] = '-d'
533 main
['YACCHXXFILESUFFIX'] = '.hh'
535 # Do this after we save setting back, or else we'll tack on an
536 # extra 'qdo' every time we run scons.
538 main
['CC'] = main
['BATCH_CMD'] + ' ' + main
['CC']
539 main
['CXX'] = main
['BATCH_CMD'] + ' ' + main
['CXX']
540 main
['AS'] = main
['BATCH_CMD'] + ' ' + main
['AS']
541 main
['AR'] = main
['BATCH_CMD'] + ' ' + main
['AR']
542 main
['RANLIB'] = main
['BATCH_CMD'] + ' ' + main
['RANLIB']
544 if sys
.platform
== 'cygwin':
545 # cygwin has some header file issues...
546 main
.Append(CCFLAGS
=["-Wno-uninitialized"])
549 have_pkg_config
= readCommand(['pkg-config', '--version'], exception
='')
551 # Check for the protobuf compiler
553 main
['HAVE_PROTOC'] = True
554 protoc_version
= readCommand([main
['PROTOC'], '--version']).split()
556 # First two words should be "libprotoc x.y.z"
557 if len(protoc_version
) < 2 or protoc_version
[0] != 'libprotoc':
558 warning('Protocol buffer compiler (protoc) not found.\n'
559 'Please install protobuf-compiler for tracing support.')
560 main
['HAVE_PROTOC'] = False
562 # Based on the availability of the compress stream wrappers,
564 min_protoc_version
= '2.1.0'
565 if compareVersions(protoc_version
[1], min_protoc_version
) < 0:
566 warning('protoc version', min_protoc_version
,
567 'or newer required.\n'
568 'Installed version:', protoc_version
[1])
569 main
['HAVE_PROTOC'] = False
571 # Attempt to determine the appropriate include path and
572 # library path using pkg-config, that means we also need to
573 # check for pkg-config. Note that it is possible to use
574 # protobuf without the involvement of pkg-config. Later on we
575 # check go a library config check and at that point the test
576 # will fail if libprotobuf cannot be found.
579 # Attempt to establish what linking flags to add for
583 'pkg-config --cflags --libs-only-L protobuf')
585 warning('pkg-config could not get protobuf flags.')
586 except Exception as e
:
587 warning('While checking protoc version:', str(e
))
588 main
['HAVE_PROTOC'] = False
590 # Check for 'timeout' from GNU coreutils. If present, regressions will
591 # be run with a time limit. We require version 8.13 since we rely on
592 # support for the '--foreground' option.
593 if sys
.platform
.startswith('freebsd'):
594 timeout_lines
= readCommand(['gtimeout', '--version'],
595 exception
='').splitlines()
597 timeout_lines
= readCommand(['timeout', '--version'],
598 exception
='').splitlines()
599 # Get the first line and tokenize it
600 timeout_version
= timeout_lines
[0].split() if timeout_lines
else []
601 main
['TIMEOUT'] = timeout_version
and \
602 compareVersions(timeout_version
[-1], '8.13') >= 0
604 # Add a custom Check function to test for structure members.
605 def CheckMember(context
, include
, decl
, member
, include_quotes
="<>"):
606 context
.Message("Checking for member %s in %s..." %
612 (void)test.%(member)s;
615 """ % { "header" : include_quotes
[0] + include
+ include_quotes
[1],
620 ret
= context
.TryCompile(text
, extension
=".cc")
624 # Platform-specific configuration. Note again that we assume that all
625 # builds under a given build root run on the same host platform.
626 conf
= Configure(main
,
627 conf_dir
= joinpath(build_root
, '.scons_config'),
628 log_file
= joinpath(build_root
, 'scons_config.log'),
630 'CheckMember' : CheckMember
,
633 # Check if we should compile a 64 bit binary on Mac OS X/Darwin
636 uname
= platform
.uname()
637 if uname
[0] == 'Darwin' and compareVersions(uname
[2], '9.0.0') >= 0:
638 if int(readCommand('sysctl -n hw.cpu64bit_capable')[0]):
639 main
.Append(CCFLAGS
=['-arch', 'x86_64'])
640 main
.Append(CFLAGS
=['-arch', 'x86_64'])
641 main
.Append(LINKFLAGS
=['-arch', 'x86_64'])
642 main
.Append(ASFLAGS
=['-arch', 'x86_64'])
646 # Recent versions of scons substitute a "Null" object for Configure()
647 # when configuration isn't necessary, e.g., if the "--help" option is
648 # present. Unfortuantely this Null object always returns false,
649 # breaking all our configuration checks. We replace it with our own
650 # more optimistic null object that returns True instead.
652 def NullCheck(*args
, **kwargs
):
656 def __init__(self
, env
):
660 def __getattr__(self
, mname
):
663 conf
= NullConf(main
)
665 # Cache build files in the supplied directory.
666 if main
['M5_BUILD_CACHE']:
667 print('Using build cache located at', main
['M5_BUILD_CACHE'])
668 CacheDir(main
['M5_BUILD_CACHE'])
670 main
['USE_PYTHON'] = not GetOption('without_python')
671 if main
['USE_PYTHON']:
672 # Find Python include and library directories for embedding the
673 # interpreter. We rely on python-config to resolve the appropriate
674 # includes and linker flags. ParseConfig does not seem to understand
675 # the more exotic linker flags such as -Xlinker and -export-dynamic so
676 # we add them explicitly below. If you want to link in an alternate
677 # version of python, see above for instructions on how to invoke
678 # scons with the appropriate PATH set.
680 python_config
= main
.Detect(main
['PYTHON_CONFIG'])
681 if python_config
is None:
682 error("Can't find a suitable python-config, tried %s" % \
683 main
['PYTHON_CONFIG'])
685 print("Info: Using Python config: %s" % (python_config
, ))
686 py_includes
= readCommand([python_config
, '--includes'],
687 exception
='').split()
688 py_includes
= list(filter(
689 lambda s
: match(r
'.*\/include\/.*',s
), py_includes
))
690 # Strip the -I from the include folders before adding them to the
692 py_includes
= list(map(
693 lambda s
: s
[2:] if s
.startswith('-I') else s
, py_includes
))
694 main
.Append(CPPPATH
=py_includes
)
696 # Read the linker flags and split them into libraries and other link
697 # flags. The libraries are added later through the call the CheckLib.
698 # Note: starting in Python 3.8 the --embed flag is required to get the
699 # -lpython3.8 linker flag
700 retcode
, cmd_stdout
= readCommandWithReturn(
701 [python_config
, '--ldflags', '--embed'], exception
='')
703 # If --embed isn't detected then we're running python <3.8
704 retcode
, cmd_stdout
= readCommandWithReturn(
705 [python_config
, '--ldflags'], exception
='')
707 # Checking retcode again
709 error("Failing on python-config --ldflags command")
711 py_ld_flags
= cmd_stdout
.split()
714 for lib
in py_ld_flags
:
715 if not lib
.startswith('-l'):
716 main
.Append(LINKFLAGS
=[lib
])
719 if lib
not in py_libs
:
722 # verify that this stuff works
723 if not conf
.CheckHeader('Python.h', '<>'):
724 error("Check failed for Python.h header in",
725 ' '.join(py_includes
), "\n"
726 "Two possible reasons:\n"
727 "1. Python headers are not installed (You can install the "
728 "package python-dev on Ubuntu and RedHat)\n"
729 "2. SCons is using a wrong C compiler. This can happen if "
730 "CC has the wrong value.\n"
731 "CC = %s" % main
['CC'])
734 if not conf
.CheckLib(lib
):
735 error("Can't find library %s required by python." % lib
)
737 main
.Prepend(CPPPATH
=Dir('ext/pybind11/include/'))
738 # Bare minimum environment that only includes python
739 marshal_env
= main
.Clone()
740 marshal_env
.Append(CCFLAGS
='$MARSHAL_CCFLAGS_EXTRA')
741 marshal_env
.Append(LINKFLAGS
='$MARSHAL_LDFLAGS_EXTRA')
743 # On Solaris you need to use libsocket for socket ops
744 if not conf
.CheckLibWithHeader(None, 'sys/socket.h', 'C++', 'accept(0,0,0);'):
745 if not conf
.CheckLibWithHeader('socket', 'sys/socket.h',
746 'C++', 'accept(0,0,0);'):
747 error("Can't find library with socket calls (e.g. accept()).")
749 # Check for zlib. If the check passes, libz will be automatically
750 # added to the LIBS environment variable.
751 if not conf
.CheckLibWithHeader('z', 'zlib.h', 'C++','zlibVersion();'):
752 error('Did not find needed zlib compression library '
753 'and/or zlib.h header file.\n'
754 'Please install zlib and try again.')
756 # If we have the protobuf compiler, also make sure we have the
757 # development libraries. If the check passes, libprotobuf will be
758 # automatically added to the LIBS environment variable. After
759 # this, we can use the HAVE_PROTOBUF flag to determine if we have
760 # got both protoc and libprotobuf available.
761 main
['HAVE_PROTOBUF'] = main
['HAVE_PROTOC'] and \
762 conf
.CheckLibWithHeader('protobuf', 'google/protobuf/message.h',
763 'C++', 'GOOGLE_PROTOBUF_VERIFY_VERSION;')
765 # Valgrind gets much less confused if you tell it when you're using
766 # alternative stacks.
767 main
['HAVE_VALGRIND'] = conf
.CheckCHeader('valgrind/valgrind.h')
769 # If we have the compiler but not the library, print another warning.
770 if main
['HAVE_PROTOC'] and not main
['HAVE_PROTOBUF']:
771 warning('Did not find protocol buffer library and/or headers.\n'
772 'Please install libprotobuf-dev for tracing support.')
776 conf
.CheckLibWithHeader(None, 'time.h', 'C',
777 'clock_nanosleep(0,0,NULL,NULL);') or \
778 conf
.CheckLibWithHeader('rt', 'time.h', 'C',
779 'clock_nanosleep(0,0,NULL,NULL);')
781 have_posix_timers
= \
782 conf
.CheckLibWithHeader([None, 'rt'], [ 'time.h', 'signal.h' ], 'C',
783 'timer_create(CLOCK_MONOTONIC, NULL, NULL);')
785 if not GetOption('without_tcmalloc'):
786 if conf
.CheckLib('tcmalloc'):
787 main
.Append(CCFLAGS
=main
['TCMALLOC_CCFLAGS'])
788 elif conf
.CheckLib('tcmalloc_minimal'):
789 main
.Append(CCFLAGS
=main
['TCMALLOC_CCFLAGS'])
791 warning("You can get a 12% performance improvement by "
792 "installing tcmalloc (libgoogle-perftools-dev package "
793 "on Ubuntu or RedHat).")
796 # Detect back trace implementations. The last implementation in the
797 # list will be used by default.
798 backtrace_impls
= [ "none" ]
800 backtrace_checker
= 'char temp;' + \
801 ' backtrace_symbols_fd((void*)&temp, 0, 0);'
802 if conf
.CheckLibWithHeader(None, 'execinfo.h', 'C', backtrace_checker
):
803 backtrace_impls
.append("glibc")
804 elif conf
.CheckLibWithHeader('execinfo', 'execinfo.h', 'C',
806 # NetBSD and FreeBSD need libexecinfo.
807 backtrace_impls
.append("glibc")
808 main
.Append(LIBS
=['execinfo'])
810 if backtrace_impls
[-1] == "none":
811 default_backtrace_impl
= "none"
812 warning("No suitable back trace implementation found.")
814 if not have_posix_clock
:
815 warning("Can't find library for POSIX clocks.")
817 # Check for <fenv.h> (C99 FP environment control)
818 have_fenv
= conf
.CheckHeader('fenv.h', '<>')
820 warning("Header file <fenv.h> not found.\n"
821 "This host has no IEEE FP rounding mode control.")
823 # Check for <png.h> (libpng library needed if wanting to dump
824 # frame buffer image in png format)
825 have_png
= conf
.CheckHeader('png.h', '<>')
827 warning("Header file <png.h> not found.\n"
828 "This host has no libpng library.\n"
829 "Disabling support for PNG framebuffers.")
831 # Check if we should enable KVM-based hardware virtualization. The API
832 # we rely on exists since version 2.6.36 of the kernel, but somehow
833 # the KVM_API_VERSION does not reflect the change. We test for one of
834 # the types as a fall back.
835 have_kvm
= conf
.CheckHeader('linux/kvm.h', '<>')
837 print("Info: Compatible header file <linux/kvm.h> not found, "
838 "disabling KVM support.")
840 # Check if the TUN/TAP driver is available.
841 have_tuntap
= conf
.CheckHeader('linux/if_tun.h', '<>')
843 print("Info: Compatible header file <linux/if_tun.h> not found.")
845 # x86 needs support for xsave. We test for the structure here since we
846 # won't be able to run new tests by the time we know which ISA we're
848 have_kvm_xsave
= conf
.CheckTypeSize('struct kvm_xsave',
849 '#include <linux/kvm.h>') != 0
851 # Check if the requested target ISA is compatible with the host
852 def is_isa_kvm_compatible(isa
):
855 host_isa
= platform
.machine()
857 warning("Failed to determine host ISA.")
860 if not have_posix_timers
:
861 warning("Can not enable KVM, host seems to lack support "
866 return host_isa
in ( "armv7l", "aarch64" )
868 if host_isa
!= "x86_64":
871 if not have_kvm_xsave
:
872 warning("KVM on x86 requires xsave support in kernel headers.")
880 # Check if the exclude_host attribute is available. We want this to
881 # get accurate instruction counts in KVM.
882 main
['HAVE_PERF_ATTR_EXCLUDE_HOST'] = conf
.CheckMember(
883 'linux/perf_event.h', 'struct perf_event_attr', 'exclude_host')
887 conf
.CheckLibWithHeader('hdf5', 'hdf5.h', 'C',
888 'H5Fcreate("", 0, 0, 0);') and \
889 conf
.CheckLibWithHeader('hdf5_cpp', 'H5Cpp.h', 'C++',
890 'H5::H5File("", 0);')
892 def check_hdf5_pkg(name
):
893 print("Checking for %s using pkg-config..." % name
, end
="")
894 if not have_pkg_config
:
895 print(" pkg-config not found")
899 main
.ParseConfig('pkg-config --cflags-only-I --libs-only-L %s' % name
)
906 # Check if there is a pkg-config configuration for hdf5. If we find
907 # it, setup the environment to enable linking and header inclusion. We
908 # don't actually try to include any headers or link with hdf5 at this
910 if not check_hdf5_pkg('hdf5-serial'):
911 check_hdf5_pkg('hdf5')
913 # Check if the HDF5 libraries can be found. This check respects the
914 # include path and library path provided by pkg-config. We perform
915 # this check even if there isn't a pkg-config configuration for hdf5
916 # since some installations don't use pkg-config.
917 have_hdf5
= check_hdf5()
919 print("Warning: Couldn't find any HDF5 C++ libraries. Disabling")
920 print(" HDF5 support.")
922 ######################################################################
924 # Finish the configuration
928 ######################################################################
930 # Collect all non-global variables
933 # Define the universe of supported ISAs
935 all_gpu_isa_list
= [ ]
936 Export('all_isa_list')
937 Export('all_gpu_isa_list')
939 class CpuModel(object):
940 '''The CpuModel class encapsulates everything the ISA parser needs to
941 know about a particular CPU model.'''
943 # Dict of available CPU model objects. Accessible as CpuModel.dict.
946 # Constructor. Automatically adds models to CpuModel.dict.
947 def __init__(self
, name
, default
=False):
948 self
.name
= name
# name of model
950 # This cpu is enabled by default
951 self
.default
= default
954 if name
in CpuModel
.dict:
955 raise AttributeError("CpuModel '%s' already registered" % name
)
956 CpuModel
.dict[name
] = self
960 # Sticky variables get saved in the variables file so they persist from
961 # one invocation to the next (unless overridden, in which case the new
962 # value becomes sticky).
963 sticky_vars
= Variables(args
=ARGUMENTS
)
964 Export('sticky_vars')
966 # Sticky variables that should be exported
968 Export('export_vars')
972 Export('all_protocols')
974 Export('protocol_dirs')
976 Export('slicc_includes')
978 # Walk the tree and execute all SConsopts scripts that wil add to the
980 if GetOption('verbose'):
981 print("Reading SConsopts")
982 for bdir
in [ base_dir
] + extras_dir_list
:
984 error("Directory '%s' does not exist." % bdir
)
985 for root
, dirs
, files
in os
.walk(bdir
):
986 if 'SConsopts' in files
:
987 if GetOption('verbose'):
988 print("Reading", joinpath(root
, 'SConsopts'))
989 SConscript(joinpath(root
, 'SConsopts'))
992 all_gpu_isa_list
.sort()
994 sticky_vars
.AddVariables(
995 EnumVariable('TARGET_ISA', 'Target ISA', 'null', all_isa_list
),
996 EnumVariable('TARGET_GPU_ISA', 'Target GPU ISA', 'gcn3', all_gpu_isa_list
),
997 ListVariable('CPU_MODELS', 'CPU models',
998 sorted(n
for n
,m
in CpuModel
.dict.items() if m
.default
),
999 sorted(CpuModel
.dict.keys())),
1000 BoolVariable('EFENCE', 'Link with Electric Fence malloc debugger',
1002 BoolVariable('USE_SSE2',
1003 'Compile for SSE2 (-msse2) to get IEEE FP on x86 hosts',
1005 BoolVariable('USE_POSIX_CLOCK', 'Use POSIX Clocks', have_posix_clock
),
1006 BoolVariable('USE_FENV', 'Use <fenv.h> IEEE mode control', have_fenv
),
1007 BoolVariable('USE_PNG', 'Enable support for PNG images', have_png
),
1008 BoolVariable('CP_ANNOTATE', 'Enable critical path annotation capability',
1010 BoolVariable('USE_KVM', 'Enable hardware virtualized (KVM) CPU models',
1012 BoolVariable('USE_TUNTAP',
1013 'Enable using a tap device to bridge to the host network',
1015 BoolVariable('BUILD_GPU', 'Build the compute-GPU model', False),
1016 EnumVariable('PROTOCOL', 'Coherence protocol for Ruby', 'None',
1018 EnumVariable('BACKTRACE_IMPL', 'Post-mortem dump implementation',
1019 backtrace_impls
[-1], backtrace_impls
),
1020 ('NUMBER_BITS_PER_SET', 'Max elements in set (default 64)',
1022 BoolVariable('USE_HDF5', 'Enable the HDF5 support', have_hdf5
),
1025 # These variables get exported to #defines in config/*.hh (see src/SConscript).
1026 export_vars
+= ['USE_FENV', 'TARGET_ISA', 'TARGET_GPU_ISA', 'CP_ANNOTATE',
1027 'USE_POSIX_CLOCK', 'USE_KVM', 'USE_TUNTAP', 'PROTOCOL',
1028 'HAVE_PROTOBUF', 'HAVE_VALGRIND',
1029 'HAVE_PERF_ATTR_EXCLUDE_HOST', 'USE_PNG',
1030 'NUMBER_BITS_PER_SET', 'USE_HDF5']
1032 ###################################################
1034 # Define a SCons builder for configuration flag headers.
1036 ###################################################
1038 # This function generates a config header file that #defines the
1039 # variable symbol to the current variable setting (0 or 1). The source
1040 # operands are the name of the variable and a Value node containing the
1041 # value of the variable.
1042 def build_config_file(target
, source
, env
):
1043 (variable
, value
) = [s
.get_contents().decode('utf-8') for s
in source
]
1044 with
open(str(target
[0]), 'w') as f
:
1045 print('#define', variable
, value
, file=f
)
1048 # Combine the two functions into a scons Action object.
1049 config_action
= MakeAction(build_config_file
, Transform("CONFIG H", 2))
1051 # The emitter munges the source & target node lists to reflect what
1052 # we're really doing.
1053 def config_emitter(target
, source
, env
):
1054 # extract variable name from Builder arg
1055 variable
= str(target
[0])
1056 # True target is config header file
1057 target
= joinpath('config', variable
.lower() + '.hh')
1059 if isinstance(val
, bool):
1060 # Force value to 0/1
1062 elif isinstance(val
, str):
1063 val
= '"' + val
+ '"'
1065 # Sources are variable name & value (packaged in SCons Value nodes)
1066 return ([target
], [Value(variable
), Value(val
)])
1068 config_builder
= Builder(emitter
= config_emitter
, action
= config_action
)
1070 main
.Append(BUILDERS
= { 'ConfigFile' : config_builder
})
1072 ###################################################
1074 # Builders for static and shared partially linked object files.
1076 ###################################################
1078 partial_static_builder
= Builder(action
=SCons
.Defaults
.LinkAction
,
1079 src_suffix
='$OBJSUFFIX',
1080 src_builder
=['StaticObject', 'Object'],
1081 LINKFLAGS
='$PLINKFLAGS',
1084 def partial_shared_emitter(target
, source
, env
):
1086 tgt
.attributes
.shared
= 1
1087 return (target
, source
)
1088 partial_shared_builder
= Builder(action
=SCons
.Defaults
.ShLinkAction
,
1089 emitter
=partial_shared_emitter
,
1090 src_suffix
='$SHOBJSUFFIX',
1091 src_builder
='SharedObject',
1092 SHLINKFLAGS
='$PSHLINKFLAGS',
1095 main
.Append(BUILDERS
= { 'PartialShared' : partial_shared_builder
,
1096 'PartialStatic' : partial_static_builder
})
1098 def add_local_rpath(env
, *targets
):
1099 '''Set up an RPATH for a library which lives in the build directory.
1101 The construction environment variable BIN_RPATH_PREFIX should be set to
1102 the relative path of the build directory starting from the location of the
1104 for target
in targets
:
1105 target
= env
.Entry(target
)
1106 if not isinstance(target
, SCons
.Node
.FS
.Dir
):
1108 relpath
= os
.path
.relpath(target
.abspath
, env
['BUILDDIR'])
1111 '${BIN_RPATH_PREFIX}',
1114 env
.Append(RPATH
=[env
.Literal(os
.path
.join(*components
))])
1116 if sys
.platform
!= "darwin":
1117 main
.Append(LINKFLAGS
=Split('-z origin'))
1119 main
.AddMethod(add_local_rpath
, 'AddLocalRPATH')
1121 # builds in ext are shared across all configs in the build root.
1122 ext_dir
= abspath(joinpath(str(main
.root
), 'ext'))
1124 for root
, dirs
, files
in os
.walk(ext_dir
):
1125 if 'SConscript' in files
:
1126 build_dir
= os
.path
.relpath(root
, ext_dir
)
1127 ext_build_dirs
.append(build_dir
)
1128 main
.SConscript(joinpath(root
, 'SConscript'),
1129 variant_dir
=joinpath(build_root
, build_dir
))
1131 gdb_xml_dir
= joinpath(ext_dir
, 'gdb-xml')
1132 Export('gdb_xml_dir')
1134 ###################################################
1136 # This builder and wrapper method are used to set up a directory with
1137 # switching headers. Those are headers which are in a generic location and
1138 # that include more specific headers from a directory chosen at build time
1139 # based on the current build settings.
1141 ###################################################
1143 def build_switching_header(target
, source
, env
):
1144 path
= str(target
[0])
1145 subdir
= str(source
[0])
1146 dp
, fp
= os
.path
.split(path
)
1147 dp
= os
.path
.relpath(os
.path
.realpath(dp
),
1148 os
.path
.realpath(env
['BUILDDIR']))
1149 with
open(path
, 'w') as hdr
:
1150 print('#include "%s/%s/%s"' % (dp
, subdir
, fp
), file=hdr
)
1152 switching_header_action
= MakeAction(build_switching_header
,
1153 Transform('GENERATE'))
1155 switching_header_builder
= Builder(action
=switching_header_action
,
1156 source_factory
=Value
,
1159 main
.Append(BUILDERS
= { 'SwitchingHeader': switching_header_builder
})
1161 def switching_headers(self
, headers
, source
):
1162 for header
in headers
:
1163 self
.SwitchingHeader(header
, source
)
1165 main
.AddMethod(switching_headers
, 'SwitchingHeaders')
1167 ###################################################
1169 # Define build environments for selected configurations.
1171 ###################################################
1173 for variant_path
in variant_paths
:
1174 if not GetOption('silent'):
1175 print("Building in", variant_path
)
1177 # Make a copy of the build-root environment to use for this config.
1179 env
['BUILDDIR'] = variant_path
1181 # variant_dir is the tail component of build path, and is used to
1182 # determine the build parameters (e.g., 'X86')
1183 (build_root
, variant_dir
) = splitpath(variant_path
)
1185 # Set env variables according to the build directory config.
1186 sticky_vars
.files
= []
1187 # Variables for $BUILD_ROOT/$VARIANT_DIR are stored in
1188 # $BUILD_ROOT/variables/$VARIANT_DIR so you can nuke
1189 # $BUILD_ROOT/$VARIANT_DIR without losing your variables settings.
1190 current_vars_file
= joinpath(build_root
, 'variables', variant_dir
)
1191 if isfile(current_vars_file
):
1192 sticky_vars
.files
.append(current_vars_file
)
1193 if not GetOption('silent'):
1194 print("Using saved variables file %s" % current_vars_file
)
1195 elif variant_dir
in ext_build_dirs
:
1196 # Things in ext are built without a variant directory.
1199 # Build dir-specific variables file doesn't exist.
1201 # Make sure the directory is there so we can create it later
1202 opt_dir
= dirname(current_vars_file
)
1203 if not isdir(opt_dir
):
1206 # Get default build variables from source tree. Variables are
1207 # normally determined by name of $VARIANT_DIR, but can be
1208 # overridden by '--default=' arg on command line.
1209 default
= GetOption('default')
1210 opts_dir
= joinpath(main
.root
.abspath
, 'build_opts')
1212 default_vars_files
= [joinpath(build_root
, 'variables', default
),
1213 joinpath(opts_dir
, default
)]
1215 default_vars_files
= [joinpath(opts_dir
, variant_dir
)]
1216 existing_files
= list(filter(isfile
, default_vars_files
))
1218 default_vars_file
= existing_files
[0]
1219 sticky_vars
.files
.append(default_vars_file
)
1220 print("Variables file %s not found,\n using defaults in %s"
1221 % (current_vars_file
, default_vars_file
))
1223 error("Cannot find variables file %s or default file(s) %s"
1224 % (current_vars_file
, ' or '.join(default_vars_files
)))
1227 # Apply current variable settings to env
1228 sticky_vars
.Update(env
)
1230 help_texts
["local_vars"] += \
1231 "Build variables for %s:\n" % variant_dir \
1232 + sticky_vars
.GenerateHelpText(env
)
1234 # Process variable settings.
1236 if not have_fenv
and env
['USE_FENV']:
1237 warning("<fenv.h> not available; forcing USE_FENV to False in",
1239 env
['USE_FENV'] = False
1241 if not env
['USE_FENV']:
1242 warning("No IEEE FP rounding mode control in", variant_dir
+ ".\n"
1243 "FP results may deviate slightly from other platforms.")
1245 if not have_png
and env
['USE_PNG']:
1246 warning("<png.h> not available; forcing USE_PNG to False in",
1248 env
['USE_PNG'] = False
1251 env
.Append(LIBS
=['png'])
1254 env
.Append(LIBS
=['efence'])
1258 warning("Can not enable KVM, host seems to lack KVM support")
1259 env
['USE_KVM'] = False
1260 elif not is_isa_kvm_compatible(env
['TARGET_ISA']):
1261 print("Info: KVM support disabled due to unsupported host and "
1262 "target ISA combination")
1263 env
['USE_KVM'] = False
1265 if env
['USE_TUNTAP']:
1267 warning("Can't connect EtherTap with a tap device.")
1268 env
['USE_TUNTAP'] = False
1270 if env
['BUILD_GPU']:
1271 env
.Append(CPPDEFINES
=['BUILD_GPU'])
1273 # Warn about missing optional functionality
1275 if not main
['HAVE_PERF_ATTR_EXCLUDE_HOST']:
1276 warning("perf_event headers lack support for the exclude_host "
1277 "attribute. KVM instruction counts will be inaccurate.")
1279 # Save sticky variable settings back to current variables file
1280 sticky_vars
.Save(current_vars_file
, env
)
1283 env
.Append(CCFLAGS
=['-msse2'])
1285 env
.Append(CCFLAGS
='$CCFLAGS_EXTRA')
1286 env
.Append(LINKFLAGS
='$LDFLAGS_EXTRA')
1288 # The src/SConscript file sets up the build rules in 'env' according
1289 # to the configured variables. It returns a list of environments,
1290 # one for each variant build (debug, opt, etc.)
1291 SConscript('src/SConscript', variant_dir
=variant_path
,
1292 exports
=['env', 'marshal_env'])
1296 Usage: scons [scons options] [build variables] [target(s)]
1298 Extra scons options:
1301 Global build variables:
1307 atexit
.register(summarize_warnings
)