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
102 AddOption('--colors', dest
='use_colors', action
='store_true',
103 help="Add color to abbreviated scons output")
104 AddOption('--no-colors', dest
='use_colors', action
='store_false',
105 help="Don't add color to abbreviated scons output")
106 AddOption('--with-cxx-config', action
='store_true',
107 help="Build with support for C++-based configuration")
108 AddOption('--default',
109 help='Override which build_opts file to use for defaults')
110 AddOption('--ignore-style', action
='store_true',
111 help='Disable style checking hooks')
112 AddOption('--gold-linker', action
='store_true', help='Use the gold linker')
113 AddOption('--no-lto', action
='store_true',
114 help='Disable Link-Time Optimization for fast')
115 AddOption('--force-lto', action
='store_true',
116 help='Use Link-Time Optimization instead of partial linking' +
117 ' when the compiler doesn\'t support using them together.')
118 AddOption('--verbose', action
='store_true',
119 help='Print full tool command lines')
120 AddOption('--without-python', action
='store_true',
121 help='Build without Python configuration support')
122 AddOption('--without-tcmalloc', action
='store_true',
123 help='Disable linking against tcmalloc')
124 AddOption('--with-ubsan', action
='store_true',
125 help='Build with Undefined Behavior Sanitizer if available')
126 AddOption('--with-asan', action
='store_true',
127 help='Build with Address Sanitizer if available')
128 AddOption('--with-systemc-tests', action
='store_true',
129 help='Build systemc tests')
131 from gem5_scons
import Transform
, error
, warning
, summarize_warnings
133 if GetOption('no_lto') and GetOption('force_lto'):
134 error('--no-lto and --force-lto are mutually exclusive')
136 ########################################################################
138 # Set up the main build environment.
140 ########################################################################
144 from gem5_scons
.util
import get_termcap
145 termcap
= get_termcap()
147 main_dict_keys
= main
.Dictionary().keys()
149 # Check that we have a C/C++ compiler
150 if not ('CC' in main_dict_keys
and 'CXX' in main_dict_keys
):
151 error("No C++ compiler installed (package g++ on Ubuntu and RedHat)")
153 ###################################################
155 # Figure out which configurations to set up based on the path(s) of
158 ###################################################
160 # Find default configuration & binary.
161 Default(environ
.get('M5_DEFAULT_BINARY', 'build/ARM/gem5.debug'))
163 # helper function: find last occurrence of element in list
164 def rfind(l
, elt
, offs
= -1):
165 for i
in range(len(l
)+offs
, 0, -1):
168 raise ValueError("element not found")
170 # Take a list of paths (or SCons Nodes) and return a list with all
171 # paths made absolute and ~-expanded. Paths will be interpreted
172 # relative to the launch directory unless a different root is provided
173 def makePathListAbsolute(path_list
, root
=GetLaunchDir()):
174 return [abspath(joinpath(root
, expanduser(str(p
))))
177 # Each target must have 'build' in the interior of the path; the
178 # directory below this will determine the build parameters. For
179 # example, for target 'foo/bar/build/X86/arch/x86/blah.do' we
180 # recognize that X86 specifies the configuration because it
181 # follow 'build' in the build path.
183 # The funky assignment to "[:]" is needed to replace the list contents
184 # in place rather than reassign the symbol to a new list, which
185 # doesn't work (obviously!).
186 BUILD_TARGETS
[:] = makePathListAbsolute(BUILD_TARGETS
)
188 # Generate a list of the unique build roots and configs that the
189 # collected targets reference.
192 for t
in BUILD_TARGETS
:
193 path_dirs
= t
.split('/')
195 build_top
= rfind(path_dirs
, 'build', -2)
197 error("No non-leaf 'build' dir found on target path.", t
)
198 this_build_root
= joinpath('/',*path_dirs
[:build_top
+1])
200 build_root
= this_build_root
202 if this_build_root
!= build_root
:
203 error("build targets not under same build root\n"
204 " %s\n %s" % (build_root
, this_build_root
))
205 variant_path
= joinpath('/',*path_dirs
[:build_top
+2])
206 if variant_path
not in variant_paths
:
207 variant_paths
.append(variant_path
)
209 # Make sure build_root exists (might not if this is the first build there)
210 if not isdir(build_root
):
212 main
['BUILDROOT'] = build_root
216 main
.SConsignFile(joinpath(build_root
, "sconsign"))
218 # Default duplicate option is to use hard links, but this messes up
219 # when you use emacs to edit a file in the target dir, as emacs moves
220 # file to file~ then copies to file, breaking the link. Symbolic
221 # (soft) links work better.
222 main
.SetOption('duplicate', 'soft-copy')
225 # Set up global sticky variables... these are common to an entire build
226 # tree (not specific to a particular build like X86)
229 global_vars_file
= joinpath(build_root
, 'variables.global')
231 global_vars
= Variables(global_vars_file
, args
=ARGUMENTS
)
233 global_vars
.AddVariables(
234 ('CC', 'C compiler', environ
.get('CC', main
['CC'])),
235 ('CXX', 'C++ compiler', environ
.get('CXX', main
['CXX'])),
236 ('CCFLAGS_EXTRA', 'Extra C and C++ compiler flags', ''),
237 ('LDFLAGS_EXTRA', 'Extra linker flags', ''),
238 ('MARSHAL_CCFLAGS_EXTRA', 'Extra C and C++ marshal compiler flags', ''),
239 ('MARSHAL_LDFLAGS_EXTRA', 'Extra marshal linker flags', ''),
240 ('PYTHON_CONFIG', 'Python config binary to use',
241 [ 'python2.7-config', 'python-config', 'python3-config' ]),
242 ('PROTOC', 'protoc tool', environ
.get('PROTOC', 'protoc')),
243 ('BATCH', 'Use batch pool for build and tests', False),
244 ('BATCH_CMD', 'Batch pool submission command name', 'qdo'),
245 ('M5_BUILD_CACHE', 'Cache built objects in this directory', False),
246 ('EXTRAS', 'Add extra directories to the compilation', '')
249 # Update main environment with values from ARGUMENTS & global_vars_file
250 global_vars
.Update(main
)
252 Global build variables:
254 '''.format(help=global_vars
.GenerateHelpText(main
)), append
=True)
256 # Save sticky variable settings back to current variables file
257 global_vars
.Save(global_vars_file
, main
)
259 # Parse EXTRAS variable to build list of all directories where we're
260 # look for sources etc. This list is exported as extras_dir_list.
261 base_dir
= main
.srcdir
.abspath
263 extras_dir_list
= makePathListAbsolute(main
['EXTRAS'].split(':'))
268 Export('extras_dir_list')
270 # the ext directory should be on the #includes path
271 main
.Append(CPPPATH
=[Dir('ext')])
273 # Add shared top-level headers
274 main
.Prepend(CPPPATH
=Dir('include'))
276 if GetOption('verbose'):
277 def MakeAction(action
, string
, *args
, **kwargs
):
278 return Action(action
, *args
, **kwargs
)
281 main
['CCCOMSTR'] = Transform("CC")
282 main
['CXXCOMSTR'] = Transform("CXX")
283 main
['ASCOMSTR'] = Transform("AS")
284 main
['ARCOMSTR'] = Transform("AR", 0)
285 main
['LINKCOMSTR'] = Transform("LINK", 0)
286 main
['SHLINKCOMSTR'] = Transform("SHLINK", 0)
287 main
['RANLIBCOMSTR'] = Transform("RANLIB", 0)
288 main
['M4COMSTR'] = Transform("M4")
289 main
['SHCCCOMSTR'] = Transform("SHCC")
290 main
['SHCXXCOMSTR'] = Transform("SHCXX")
293 # Initialize the Link-Time Optimization (LTO) flags
294 main
['LTO_CCFLAGS'] = []
295 main
['LTO_LDFLAGS'] = []
297 # According to the readme, tcmalloc works best if the compiler doesn't
298 # assume that we're using the builtin malloc and friends. These flags
299 # are compiler-specific, so we need to set them after we detect which
300 # compiler we're using.
301 main
['TCMALLOC_CCFLAGS'] = []
303 CXX_version
= readCommand([main
['CXX'],'--version'], exception
=False)
304 CXX_V
= readCommand([main
['CXX'],'-V'], exception
=False)
306 main
['GCC'] = CXX_version
and CXX_version
.find('g++') >= 0
307 main
['CLANG'] = CXX_version
and CXX_version
.find('clang') >= 0
308 if main
['GCC'] + main
['CLANG'] > 1:
309 error('Two compilers enabled at once?')
311 # Set up default C++ compiler flags
312 if main
['GCC'] or main
['CLANG']:
313 # As gcc and clang share many flags, do the common parts here
314 main
.Append(CCFLAGS
=['-pipe'])
315 main
.Append(CCFLAGS
=['-fno-strict-aliasing'])
316 # Enable -Wall and -Wextra and then disable the few warnings that
317 # we consistently violate
318 main
.Append(CCFLAGS
=['-Wall', '-Wundef', '-Wextra',
319 '-Wno-sign-compare', '-Wno-unused-parameter'])
320 # We always compile using C++14
321 main
.Append(CXXFLAGS
=['-std=c++14'])
322 if sys
.platform
.startswith('freebsd'):
323 main
.Append(CCFLAGS
=['-I/usr/local/include'])
324 main
.Append(CXXFLAGS
=['-I/usr/local/include'])
326 # On Mac OS X/Darwin the default linker doesn't support the
328 if sys
.platform
!= "darwin":
329 main
.Append(LINKFLAGS
='-Wl,--as-needed')
330 main
['FILTER_PSHLINKFLAGS'] = lambda x
: str(x
).replace(' -shared', '')
331 main
['PSHLINKFLAGS'] = main
.subst('${FILTER_PSHLINKFLAGS(SHLINKFLAGS)}')
332 if GetOption('gold_linker'):
333 main
.Append(LINKFLAGS
='-fuse-ld=gold')
334 main
['PLINKFLAGS'] = main
.get('LINKFLAGS')
335 shared_partial_flags
= ['-r', '-nostdlib']
336 main
.Append(PSHLINKFLAGS
=shared_partial_flags
)
337 main
.Append(PLINKFLAGS
=shared_partial_flags
)
339 # Treat warnings as errors but white list some warnings that we
340 # want to allow (e.g., deprecation warnings).
341 main
.Append(CCFLAGS
=['-Werror',
342 '-Wno-error=deprecated-declarations',
343 '-Wno-error=deprecated',
347 "Don't know what compiler options to use for your compiler.",
348 "compiler: " + main
['CXX'],
349 "version: " + CXX_version
.replace('\n', '<nl>') if
350 CXX_version
else 'COMMAND NOT FOUND!',
351 "If you're trying to use a compiler other than GCC",
352 "or clang, there appears to be something wrong with your",
355 "If you are trying to use a compiler other than those listed",
356 "above you will need to ease fix SConstruct and ",
357 "src/SConscript to support that compiler.")))
360 gcc_version
= readCommand([main
['CXX'], '-dumpversion'], exception
=False)
361 if compareVersions(gcc_version
, "5") < 0:
362 error('gcc version 5 or newer required.\n'
363 'Installed version:', gcc_version
)
366 main
['GCC_VERSION'] = gcc_version
368 # Incremental linking with LTO is currently broken in gcc versions
369 # 4.9 and above. A version where everything works completely hasn't
370 # yet been identified.
372 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67548
373 main
['BROKEN_INCREMENTAL_LTO'] = True
375 if compareVersions(gcc_version
, '6.0') >= 0:
376 # gcc versions 6.0 and greater accept an -flinker-output flag which
377 # selects what type of output the linker should generate. This is
378 # necessary for incremental lto to work, but is also broken in
379 # current versions of gcc. It may not be necessary in future
380 # versions. We add it here since it might be, and as a reminder that
381 # it exists. It's excluded if lto is being forced.
383 # https://gcc.gnu.org/gcc-6/changes.html
384 # https://gcc.gnu.org/ml/gcc-patches/2015-11/msg03161.html
385 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69866
386 if not GetOption('force_lto'):
387 main
.Append(PSHLINKFLAGS
='-flinker-output=rel')
388 main
.Append(PLINKFLAGS
='-flinker-output=rel')
390 disable_lto
= GetOption('no_lto')
391 if not disable_lto
and main
.get('BROKEN_INCREMENTAL_LTO', False) and \
392 not GetOption('force_lto'):
393 warning('Your compiler doesn\'t support incremental linking and lto '
394 'at the same time, so lto is being disabled. To force lto on '
395 'anyway, use the --force-lto option. That will disable '
399 # Add the appropriate Link-Time Optimization (LTO) flags
400 # unless LTO is explicitly turned off. Note that these flags
401 # are only used by the fast target.
403 # Pass the LTO flag when compiling to produce GIMPLE
404 # output, we merely create the flags here and only append
406 main
['LTO_CCFLAGS'] = ['-flto=%d' % GetOption('num_jobs')]
408 # Use the same amount of jobs for LTO as we are running
410 main
['LTO_LDFLAGS'] = ['-flto=%d' % GetOption('num_jobs')]
412 main
.Append(TCMALLOC_CCFLAGS
=['-fno-builtin-malloc', '-fno-builtin-calloc',
413 '-fno-builtin-realloc', '-fno-builtin-free'])
416 clang_version_re
= re
.compile(".* version (\d+\.\d+)")
417 clang_version_match
= clang_version_re
.search(CXX_version
)
418 if (clang_version_match
):
419 clang_version
= clang_version_match
.groups()[0]
420 if compareVersions(clang_version
, "3.9") < 0:
421 error('clang version 3.9 or newer required.\n'
422 'Installed version:', clang_version
)
424 error('Unable to determine clang version.')
426 # clang has a few additional warnings that we disable, extraneous
427 # parantheses are allowed due to Ruby's printing of the AST,
428 # finally self assignments are allowed as the generated CPU code
430 main
.Append(CCFLAGS
=['-Wno-parentheses',
432 # Some versions of libstdc++ (4.8?) seem to
433 # use struct hash and class hash
435 '-Wno-mismatched-tags',
437 if sys
.platform
!= "darwin" and \
438 compareVersions(clang_version
, "10.0") >= 0:
439 main
.Append(CCFLAGS
=['-Wno-c99-designator'])
441 if compareVersions(clang_version
, "8.0") >= 0:
442 main
.Append(CCFLAGS
=['-Wno-defaulted-function-deleted'])
444 main
.Append(TCMALLOC_CCFLAGS
=['-fno-builtin'])
446 # On Mac OS X/Darwin we need to also use libc++ (part of XCode) as
447 # opposed to libstdc++, as the later is dated.
448 if sys
.platform
== "darwin":
449 main
.Append(CXXFLAGS
=['-stdlib=libc++'])
450 main
.Append(LIBS
=['c++'])
452 # On FreeBSD we need libthr.
453 if sys
.platform
.startswith('freebsd'):
454 main
.Append(LIBS
=['thr'])
456 # Add sanitizers flags
458 if GetOption('with_ubsan'):
459 sanitizers
.append('undefined')
460 if GetOption('with_asan'):
461 # Available for gcc >= 5 or llvm >= 3.1 both a requirement
462 # by the build system
463 sanitizers
.append('address')
464 suppressions_file
= Dir('util').File('lsan-suppressions').get_abspath()
465 suppressions_opt
= 'suppressions=%s' % suppressions_file
466 main
['ENV']['LSAN_OPTIONS'] = ':'.join([suppressions_opt
,
467 'print_suppressions=0'])
469 warning('To suppress false positive leaks, set the LSAN_OPTIONS '
470 'environment variable to "%s" when running gem5' %
472 warning('LSAN_OPTIONS=suppressions=%s' % suppressions_opt
)
475 sanitizers
= ','.join(sanitizers
)
476 if main
['GCC'] or main
['CLANG']:
477 main
.Append(CCFLAGS
=['-fsanitize=%s' % sanitizers
,
478 '-fno-omit-frame-pointer'],
479 LINKFLAGS
='-fsanitize=%s' % sanitizers
)
481 warning("Don't know how to enable %s sanitizer(s) for your "
482 "compiler." % sanitizers
)
484 # Set up common yacc/bison flags (needed for Ruby)
485 main
['YACCFLAGS'] = '-d'
486 main
['YACCHXXFILESUFFIX'] = '.hh'
488 # Do this after we save setting back, or else we'll tack on an
489 # extra 'qdo' every time we run scons.
491 main
['CC'] = main
['BATCH_CMD'] + ' ' + main
['CC']
492 main
['CXX'] = main
['BATCH_CMD'] + ' ' + main
['CXX']
493 main
['AS'] = main
['BATCH_CMD'] + ' ' + main
['AS']
494 main
['AR'] = main
['BATCH_CMD'] + ' ' + main
['AR']
495 main
['RANLIB'] = main
['BATCH_CMD'] + ' ' + main
['RANLIB']
497 if sys
.platform
== 'cygwin':
498 # cygwin has some header file issues...
499 main
.Append(CCFLAGS
=["-Wno-uninitialized"])
502 have_pkg_config
= readCommand(['pkg-config', '--version'], exception
='')
504 # Check for the protobuf compiler
506 main
['HAVE_PROTOC'] = True
507 protoc_version
= readCommand([main
['PROTOC'], '--version']).split()
509 # First two words should be "libprotoc x.y.z"
510 if len(protoc_version
) < 2 or protoc_version
[0] != 'libprotoc':
511 warning('Protocol buffer compiler (protoc) not found.\n'
512 'Please install protobuf-compiler for tracing support.')
513 main
['HAVE_PROTOC'] = False
515 # Based on the availability of the compress stream wrappers,
517 min_protoc_version
= '2.1.0'
518 if compareVersions(protoc_version
[1], min_protoc_version
) < 0:
519 warning('protoc version', min_protoc_version
,
520 'or newer required.\n'
521 'Installed version:', protoc_version
[1])
522 main
['HAVE_PROTOC'] = False
524 # Attempt to determine the appropriate include path and
525 # library path using pkg-config, that means we also need to
526 # check for pkg-config. Note that it is possible to use
527 # protobuf without the involvement of pkg-config. Later on we
528 # check go a library config check and at that point the test
529 # will fail if libprotobuf cannot be found.
532 # Attempt to establish what linking flags to add for
536 'pkg-config --cflags --libs-only-L protobuf')
538 warning('pkg-config could not get protobuf flags.')
539 except Exception as e
:
540 warning('While checking protoc version:', str(e
))
541 main
['HAVE_PROTOC'] = False
543 # Check for 'timeout' from GNU coreutils. If present, regressions will
544 # be run with a time limit. We require version 8.13 since we rely on
545 # support for the '--foreground' option.
546 if sys
.platform
.startswith('freebsd'):
547 timeout_lines
= readCommand(['gtimeout', '--version'],
548 exception
='').splitlines()
550 timeout_lines
= readCommand(['timeout', '--version'],
551 exception
='').splitlines()
552 # Get the first line and tokenize it
553 timeout_version
= timeout_lines
[0].split() if timeout_lines
else []
554 main
['TIMEOUT'] = timeout_version
and \
555 compareVersions(timeout_version
[-1], '8.13') >= 0
557 # Add a custom Check function to test for structure members.
558 def CheckMember(context
, include
, decl
, member
, include_quotes
="<>"):
559 context
.Message("Checking for member %s in %s..." %
565 (void)test.%(member)s;
568 """ % { "header" : include_quotes
[0] + include
+ include_quotes
[1],
573 ret
= context
.TryCompile(text
, extension
=".cc")
577 # Platform-specific configuration. Note again that we assume that all
578 # builds under a given build root run on the same host platform.
579 conf
= Configure(main
,
580 conf_dir
= joinpath(build_root
, '.scons_config'),
581 log_file
= joinpath(build_root
, 'scons_config.log'),
583 'CheckMember' : CheckMember
,
586 # Check if we should compile a 64 bit binary on Mac OS X/Darwin
589 uname
= platform
.uname()
590 if uname
[0] == 'Darwin' and compareVersions(uname
[2], '9.0.0') >= 0:
591 if int(readCommand('sysctl -n hw.cpu64bit_capable')[0]):
592 main
.Append(CCFLAGS
=['-arch', 'x86_64'])
593 main
.Append(CFLAGS
=['-arch', 'x86_64'])
594 main
.Append(LINKFLAGS
=['-arch', 'x86_64'])
595 main
.Append(ASFLAGS
=['-arch', 'x86_64'])
599 # Recent versions of scons substitute a "Null" object for Configure()
600 # when configuration isn't necessary, e.g., if the "--help" option is
601 # present. Unfortuantely this Null object always returns false,
602 # breaking all our configuration checks. We replace it with our own
603 # more optimistic null object that returns True instead.
605 def NullCheck(*args
, **kwargs
):
609 def __init__(self
, env
):
613 def __getattr__(self
, mname
):
616 conf
= NullConf(main
)
618 # Cache build files in the supplied directory.
619 if main
['M5_BUILD_CACHE']:
620 print('Using build cache located at', main
['M5_BUILD_CACHE'])
621 CacheDir(main
['M5_BUILD_CACHE'])
623 main
['USE_PYTHON'] = not GetOption('without_python')
624 if main
['USE_PYTHON']:
625 # Find Python include and library directories for embedding the
626 # interpreter. We rely on python-config to resolve the appropriate
627 # includes and linker flags. ParseConfig does not seem to understand
628 # the more exotic linker flags such as -Xlinker and -export-dynamic so
629 # we add them explicitly below. If you want to link in an alternate
630 # version of python, see above for instructions on how to invoke
631 # scons with the appropriate PATH set.
633 python_config
= main
.Detect(main
['PYTHON_CONFIG'])
634 if python_config
is None:
635 error("Can't find a suitable python-config, tried %s" % \
636 main
['PYTHON_CONFIG'])
638 print("Info: Using Python config: %s" % (python_config
, ))
639 py_includes
= readCommand([python_config
, '--includes'],
640 exception
='').split()
641 py_includes
= list(filter(
642 lambda s
: match(r
'.*\/include\/.*',s
), py_includes
))
643 # Strip the -I from the include folders before adding them to the
645 py_includes
= list(map(
646 lambda s
: s
[2:] if s
.startswith('-I') else s
, py_includes
))
647 main
.Append(CPPPATH
=py_includes
)
649 # Read the linker flags and split them into libraries and other link
650 # flags. The libraries are added later through the call the CheckLib.
651 # Note: starting in Python 3.8 the --embed flag is required to get the
652 # -lpython3.8 linker flag
653 retcode
, cmd_stdout
= readCommandWithReturn(
654 [python_config
, '--ldflags', '--embed'], exception
='')
656 # If --embed isn't detected then we're running python <3.8
657 retcode
, cmd_stdout
= readCommandWithReturn(
658 [python_config
, '--ldflags'], exception
='')
660 # Checking retcode again
662 error("Failing on python-config --ldflags command")
664 py_ld_flags
= cmd_stdout
.split()
667 for lib
in py_ld_flags
:
668 if not lib
.startswith('-l'):
669 main
.Append(LINKFLAGS
=[lib
])
672 if lib
not in py_libs
:
675 # verify that this stuff works
676 if not conf
.CheckHeader('Python.h', '<>'):
677 error("Check failed for Python.h header in",
678 ' '.join(py_includes
), "\n"
679 "Two possible reasons:\n"
680 "1. Python headers are not installed (You can install the "
681 "package python-dev on Ubuntu and RedHat)\n"
682 "2. SCons is using a wrong C compiler. This can happen if "
683 "CC has the wrong value.\n"
684 "CC = %s" % main
['CC'])
687 if not conf
.CheckLib(lib
):
688 error("Can't find library %s required by python." % lib
)
690 main
.Prepend(CPPPATH
=Dir('ext/pybind11/include/'))
691 # Bare minimum environment that only includes python
692 marshal_env
= main
.Clone()
693 marshal_env
.Append(CCFLAGS
='$MARSHAL_CCFLAGS_EXTRA')
694 marshal_env
.Append(LINKFLAGS
='$MARSHAL_LDFLAGS_EXTRA')
696 # On Solaris you need to use libsocket for socket ops
697 if not conf
.CheckLibWithHeader(None, 'sys/socket.h', 'C++', 'accept(0,0,0);'):
698 if not conf
.CheckLibWithHeader('socket', 'sys/socket.h',
699 'C++', 'accept(0,0,0);'):
700 error("Can't find library with socket calls (e.g. accept()).")
702 # Check for zlib. If the check passes, libz will be automatically
703 # added to the LIBS environment variable.
704 if not conf
.CheckLibWithHeader('z', 'zlib.h', 'C++','zlibVersion();'):
705 error('Did not find needed zlib compression library '
706 'and/or zlib.h header file.\n'
707 'Please install zlib and try again.')
709 # If we have the protobuf compiler, also make sure we have the
710 # development libraries. If the check passes, libprotobuf will be
711 # automatically added to the LIBS environment variable. After
712 # this, we can use the HAVE_PROTOBUF flag to determine if we have
713 # got both protoc and libprotobuf available.
714 main
['HAVE_PROTOBUF'] = main
['HAVE_PROTOC'] and \
715 conf
.CheckLibWithHeader('protobuf', 'google/protobuf/message.h',
716 'C++', 'GOOGLE_PROTOBUF_VERIFY_VERSION;')
718 # Valgrind gets much less confused if you tell it when you're using
719 # alternative stacks.
720 main
['HAVE_VALGRIND'] = conf
.CheckCHeader('valgrind/valgrind.h')
722 # If we have the compiler but not the library, print another warning.
723 if main
['HAVE_PROTOC'] and not main
['HAVE_PROTOBUF']:
724 warning('Did not find protocol buffer library and/or headers.\n'
725 'Please install libprotobuf-dev for tracing support.')
729 conf
.CheckLibWithHeader(None, 'time.h', 'C',
730 'clock_nanosleep(0,0,NULL,NULL);') or \
731 conf
.CheckLibWithHeader('rt', 'time.h', 'C',
732 'clock_nanosleep(0,0,NULL,NULL);')
734 have_posix_timers
= \
735 conf
.CheckLibWithHeader([None, 'rt'], [ 'time.h', 'signal.h' ], 'C',
736 'timer_create(CLOCK_MONOTONIC, NULL, NULL);')
738 if not GetOption('without_tcmalloc'):
739 if conf
.CheckLib('tcmalloc'):
740 main
.Append(CCFLAGS
=main
['TCMALLOC_CCFLAGS'])
741 elif conf
.CheckLib('tcmalloc_minimal'):
742 main
.Append(CCFLAGS
=main
['TCMALLOC_CCFLAGS'])
744 warning("You can get a 12% performance improvement by "
745 "installing tcmalloc (libgoogle-perftools-dev package "
746 "on Ubuntu or RedHat).")
749 # Detect back trace implementations. The last implementation in the
750 # list will be used by default.
751 backtrace_impls
= [ "none" ]
753 backtrace_checker
= 'char temp;' + \
754 ' backtrace_symbols_fd((void*)&temp, 0, 0);'
755 if conf
.CheckLibWithHeader(None, 'execinfo.h', 'C', backtrace_checker
):
756 backtrace_impls
.append("glibc")
757 elif conf
.CheckLibWithHeader('execinfo', 'execinfo.h', 'C',
759 # NetBSD and FreeBSD need libexecinfo.
760 backtrace_impls
.append("glibc")
761 main
.Append(LIBS
=['execinfo'])
763 if backtrace_impls
[-1] == "none":
764 default_backtrace_impl
= "none"
765 warning("No suitable back trace implementation found.")
767 if not have_posix_clock
:
768 warning("Can't find library for POSIX clocks.")
770 # Check for <fenv.h> (C99 FP environment control)
771 have_fenv
= conf
.CheckHeader('fenv.h', '<>')
773 warning("Header file <fenv.h> not found.\n"
774 "This host has no IEEE FP rounding mode control.")
776 # Check for <png.h> (libpng library needed if wanting to dump
777 # frame buffer image in png format)
778 have_png
= conf
.CheckHeader('png.h', '<>')
780 warning("Header file <png.h> not found.\n"
781 "This host has no libpng library.\n"
782 "Disabling support for PNG framebuffers.")
784 # Check if we should enable KVM-based hardware virtualization. The API
785 # we rely on exists since version 2.6.36 of the kernel, but somehow
786 # the KVM_API_VERSION does not reflect the change. We test for one of
787 # the types as a fall back.
788 have_kvm
= conf
.CheckHeader('linux/kvm.h', '<>')
790 print("Info: Compatible header file <linux/kvm.h> not found, "
791 "disabling KVM support.")
793 # Check if the TUN/TAP driver is available.
794 have_tuntap
= conf
.CheckHeader('linux/if_tun.h', '<>')
796 print("Info: Compatible header file <linux/if_tun.h> not found.")
798 # x86 needs support for xsave. We test for the structure here since we
799 # won't be able to run new tests by the time we know which ISA we're
801 have_kvm_xsave
= conf
.CheckTypeSize('struct kvm_xsave',
802 '#include <linux/kvm.h>') != 0
804 # Check if the requested target ISA is compatible with the host
805 def is_isa_kvm_compatible(isa
):
808 host_isa
= platform
.machine()
810 warning("Failed to determine host ISA.")
813 if not have_posix_timers
:
814 warning("Can not enable KVM, host seems to lack support "
819 return host_isa
in ( "armv7l", "aarch64" )
821 if host_isa
!= "x86_64":
824 if not have_kvm_xsave
:
825 warning("KVM on x86 requires xsave support in kernel headers.")
833 # Check if the exclude_host attribute is available. We want this to
834 # get accurate instruction counts in KVM.
835 main
['HAVE_PERF_ATTR_EXCLUDE_HOST'] = conf
.CheckMember(
836 'linux/perf_event.h', 'struct perf_event_attr', 'exclude_host')
840 conf
.CheckLibWithHeader('hdf5', 'hdf5.h', 'C',
841 'H5Fcreate("", 0, 0, 0);') and \
842 conf
.CheckLibWithHeader('hdf5_cpp', 'H5Cpp.h', 'C++',
843 'H5::H5File("", 0);')
845 def check_hdf5_pkg(name
):
846 print("Checking for %s using pkg-config..." % name
, end
="")
847 if not have_pkg_config
:
848 print(" pkg-config not found")
852 main
.ParseConfig('pkg-config --cflags-only-I --libs-only-L %s' % name
)
859 # Check if there is a pkg-config configuration for hdf5. If we find
860 # it, setup the environment to enable linking and header inclusion. We
861 # don't actually try to include any headers or link with hdf5 at this
863 if not check_hdf5_pkg('hdf5-serial'):
864 check_hdf5_pkg('hdf5')
866 # Check if the HDF5 libraries can be found. This check respects the
867 # include path and library path provided by pkg-config. We perform
868 # this check even if there isn't a pkg-config configuration for hdf5
869 # since some installations don't use pkg-config.
870 have_hdf5
= check_hdf5()
872 print("Warning: Couldn't find any HDF5 C++ libraries. Disabling")
873 print(" HDF5 support.")
875 ######################################################################
877 # Finish the configuration
881 ######################################################################
883 # Collect all non-global variables
886 # Define the universe of supported ISAs
888 all_gpu_isa_list
= [ ]
889 Export('all_isa_list')
890 Export('all_gpu_isa_list')
892 class CpuModel(object):
893 '''The CpuModel class encapsulates everything the ISA parser needs to
894 know about a particular CPU model.'''
896 # Dict of available CPU model objects. Accessible as CpuModel.dict.
899 # Constructor. Automatically adds models to CpuModel.dict.
900 def __init__(self
, name
, default
=False):
901 self
.name
= name
# name of model
903 # This cpu is enabled by default
904 self
.default
= default
907 if name
in CpuModel
.dict:
908 raise AttributeError("CpuModel '%s' already registered" % name
)
909 CpuModel
.dict[name
] = self
913 # Sticky variables get saved in the variables file so they persist from
914 # one invocation to the next (unless overridden, in which case the new
915 # value becomes sticky).
916 sticky_vars
= Variables(args
=ARGUMENTS
)
917 Export('sticky_vars')
919 # Sticky variables that should be exported
921 Export('export_vars')
925 Export('all_protocols')
927 Export('protocol_dirs')
929 Export('slicc_includes')
931 # Walk the tree and execute all SConsopts scripts that wil add to the
933 if GetOption('verbose'):
934 print("Reading SConsopts")
935 for bdir
in [ base_dir
] + extras_dir_list
:
937 error("Directory '%s' does not exist." % bdir
)
938 for root
, dirs
, files
in os
.walk(bdir
):
939 if 'SConsopts' in files
:
940 if GetOption('verbose'):
941 print("Reading", joinpath(root
, 'SConsopts'))
942 SConscript(joinpath(root
, 'SConsopts'))
945 all_gpu_isa_list
.sort()
947 sticky_vars
.AddVariables(
948 EnumVariable('TARGET_ISA', 'Target ISA', 'null', all_isa_list
),
949 EnumVariable('TARGET_GPU_ISA', 'Target GPU ISA', 'gcn3', all_gpu_isa_list
),
950 ListVariable('CPU_MODELS', 'CPU models',
951 sorted(n
for n
,m
in CpuModel
.dict.items() if m
.default
),
952 sorted(CpuModel
.dict.keys())),
953 BoolVariable('EFENCE', 'Link with Electric Fence malloc debugger',
955 BoolVariable('USE_SSE2',
956 'Compile for SSE2 (-msse2) to get IEEE FP on x86 hosts',
958 BoolVariable('USE_POSIX_CLOCK', 'Use POSIX Clocks', have_posix_clock
),
959 BoolVariable('USE_FENV', 'Use <fenv.h> IEEE mode control', have_fenv
),
960 BoolVariable('USE_PNG', 'Enable support for PNG images', have_png
),
961 BoolVariable('USE_KVM', 'Enable hardware virtualized (KVM) CPU models',
963 BoolVariable('USE_TUNTAP',
964 'Enable using a tap device to bridge to the host network',
966 BoolVariable('BUILD_GPU', 'Build the compute-GPU model', False),
967 EnumVariable('PROTOCOL', 'Coherence protocol for Ruby', 'None',
969 EnumVariable('BACKTRACE_IMPL', 'Post-mortem dump implementation',
970 backtrace_impls
[-1], backtrace_impls
),
971 ('NUMBER_BITS_PER_SET', 'Max elements in set (default 64)',
973 BoolVariable('USE_HDF5', 'Enable the HDF5 support', have_hdf5
),
976 # These variables get exported to #defines in config/*.hh (see src/SConscript).
977 export_vars
+= ['USE_FENV', 'TARGET_ISA', 'TARGET_GPU_ISA',
978 'USE_POSIX_CLOCK', 'USE_KVM', 'USE_TUNTAP', 'PROTOCOL',
979 'HAVE_PROTOBUF', 'HAVE_VALGRIND',
980 'HAVE_PERF_ATTR_EXCLUDE_HOST', 'USE_PNG',
981 'NUMBER_BITS_PER_SET', 'USE_HDF5']
983 ###################################################
985 # Define a SCons builder for configuration flag headers.
987 ###################################################
989 # This function generates a config header file that #defines the
990 # variable symbol to the current variable setting (0 or 1). The source
991 # operands are the name of the variable and a Value node containing the
992 # value of the variable.
993 def build_config_file(target
, source
, env
):
994 (variable
, value
) = [s
.get_contents().decode('utf-8') for s
in source
]
995 with
open(str(target
[0]), 'w') as f
:
996 print('#define', variable
, value
, file=f
)
999 # Combine the two functions into a scons Action object.
1000 config_action
= MakeAction(build_config_file
, Transform("CONFIG H", 2))
1002 # The emitter munges the source & target node lists to reflect what
1003 # we're really doing.
1004 def config_emitter(target
, source
, env
):
1005 # extract variable name from Builder arg
1006 variable
= str(target
[0])
1007 # True target is config header file
1008 target
= joinpath('config', variable
.lower() + '.hh')
1010 if isinstance(val
, bool):
1011 # Force value to 0/1
1013 elif isinstance(val
, str):
1014 val
= '"' + val
+ '"'
1016 # Sources are variable name & value (packaged in SCons Value nodes)
1017 return ([target
], [Value(variable
), Value(val
)])
1019 config_builder
= Builder(emitter
= config_emitter
, action
= config_action
)
1021 main
.Append(BUILDERS
= { 'ConfigFile' : config_builder
})
1023 ###################################################
1025 # Builders for static and shared partially linked object files.
1027 ###################################################
1029 partial_static_builder
= Builder(action
=SCons
.Defaults
.LinkAction
,
1030 src_suffix
='$OBJSUFFIX',
1031 src_builder
=['StaticObject', 'Object'],
1032 LINKFLAGS
='$PLINKFLAGS',
1035 def partial_shared_emitter(target
, source
, env
):
1037 tgt
.attributes
.shared
= 1
1038 return (target
, source
)
1039 partial_shared_builder
= Builder(action
=SCons
.Defaults
.ShLinkAction
,
1040 emitter
=partial_shared_emitter
,
1041 src_suffix
='$SHOBJSUFFIX',
1042 src_builder
='SharedObject',
1043 SHLINKFLAGS
='$PSHLINKFLAGS',
1046 main
.Append(BUILDERS
= { 'PartialShared' : partial_shared_builder
,
1047 'PartialStatic' : partial_static_builder
})
1049 def add_local_rpath(env
, *targets
):
1050 '''Set up an RPATH for a library which lives in the build directory.
1052 The construction environment variable BIN_RPATH_PREFIX should be set to
1053 the relative path of the build directory starting from the location of the
1055 for target
in targets
:
1056 target
= env
.Entry(target
)
1057 if not isinstance(target
, SCons
.Node
.FS
.Dir
):
1059 relpath
= os
.path
.relpath(target
.abspath
, env
['BUILDDIR'])
1062 '${BIN_RPATH_PREFIX}',
1065 env
.Append(RPATH
=[env
.Literal(os
.path
.join(*components
))])
1067 if sys
.platform
!= "darwin":
1068 main
.Append(LINKFLAGS
=Split('-z origin'))
1070 main
.AddMethod(add_local_rpath
, 'AddLocalRPATH')
1072 # builds in ext are shared across all configs in the build root.
1073 ext_dir
= abspath(joinpath(str(main
.root
), 'ext'))
1075 for root
, dirs
, files
in os
.walk(ext_dir
):
1076 if 'SConscript' in files
:
1077 build_dir
= os
.path
.relpath(root
, ext_dir
)
1078 ext_build_dirs
.append(build_dir
)
1079 main
.SConscript(joinpath(root
, 'SConscript'),
1080 variant_dir
=joinpath(build_root
, build_dir
))
1082 gdb_xml_dir
= joinpath(ext_dir
, 'gdb-xml')
1083 Export('gdb_xml_dir')
1085 ###################################################
1087 # This builder and wrapper method are used to set up a directory with
1088 # switching headers. Those are headers which are in a generic location and
1089 # that include more specific headers from a directory chosen at build time
1090 # based on the current build settings.
1092 ###################################################
1094 def build_switching_header(target
, source
, env
):
1095 path
= str(target
[0])
1096 subdir
= str(source
[0])
1097 dp
, fp
= os
.path
.split(path
)
1098 dp
= os
.path
.relpath(os
.path
.realpath(dp
),
1099 os
.path
.realpath(env
['BUILDDIR']))
1100 with
open(path
, 'w') as hdr
:
1101 print('#include "%s/%s/%s"' % (dp
, subdir
, fp
), file=hdr
)
1103 switching_header_action
= MakeAction(build_switching_header
,
1104 Transform('GENERATE'))
1106 switching_header_builder
= Builder(action
=switching_header_action
,
1107 source_factory
=Value
,
1110 main
.Append(BUILDERS
= { 'SwitchingHeader': switching_header_builder
})
1112 def switching_headers(self
, headers
, source
):
1113 for header
in headers
:
1114 self
.SwitchingHeader(header
, source
)
1116 main
.AddMethod(switching_headers
, 'SwitchingHeaders')
1118 ###################################################
1120 # Define build environments for selected configurations.
1122 ###################################################
1124 for variant_path
in variant_paths
:
1125 if not GetOption('silent'):
1126 print("Building in", variant_path
)
1128 # Make a copy of the build-root environment to use for this config.
1130 env
['BUILDDIR'] = variant_path
1132 # variant_dir is the tail component of build path, and is used to
1133 # determine the build parameters (e.g., 'X86')
1134 (build_root
, variant_dir
) = splitpath(variant_path
)
1136 # Set env variables according to the build directory config.
1137 sticky_vars
.files
= []
1138 # Variables for $BUILD_ROOT/$VARIANT_DIR are stored in
1139 # $BUILD_ROOT/variables/$VARIANT_DIR so you can nuke
1140 # $BUILD_ROOT/$VARIANT_DIR without losing your variables settings.
1141 current_vars_file
= joinpath(build_root
, 'variables', variant_dir
)
1142 if isfile(current_vars_file
):
1143 sticky_vars
.files
.append(current_vars_file
)
1144 if not GetOption('silent'):
1145 print("Using saved variables file %s" % current_vars_file
)
1146 elif variant_dir
in ext_build_dirs
:
1147 # Things in ext are built without a variant directory.
1150 # Build dir-specific variables file doesn't exist.
1152 # Make sure the directory is there so we can create it later
1153 opt_dir
= dirname(current_vars_file
)
1154 if not isdir(opt_dir
):
1157 # Get default build variables from source tree. Variables are
1158 # normally determined by name of $VARIANT_DIR, but can be
1159 # overridden by '--default=' arg on command line.
1160 default
= GetOption('default')
1161 opts_dir
= joinpath(main
.root
.abspath
, 'build_opts')
1163 default_vars_files
= [joinpath(build_root
, 'variables', default
),
1164 joinpath(opts_dir
, default
)]
1166 default_vars_files
= [joinpath(opts_dir
, variant_dir
)]
1167 existing_files
= list(filter(isfile
, default_vars_files
))
1169 default_vars_file
= existing_files
[0]
1170 sticky_vars
.files
.append(default_vars_file
)
1171 print("Variables file %s not found,\n using defaults in %s"
1172 % (current_vars_file
, default_vars_file
))
1174 error("Cannot find variables file %s or default file(s) %s"
1175 % (current_vars_file
, ' or '.join(default_vars_files
)))
1178 # Apply current variable settings to env
1179 sticky_vars
.Update(env
)
1182 Build variables for {dir}:
1184 '''.format(dir=variant_dir
, help=sticky_vars
.GenerateHelpText(env
)),
1187 # Process variable settings.
1189 if not have_fenv
and env
['USE_FENV']:
1190 warning("<fenv.h> not available; forcing USE_FENV to False in",
1192 env
['USE_FENV'] = False
1194 if not env
['USE_FENV']:
1195 warning("No IEEE FP rounding mode control in", variant_dir
+ ".\n"
1196 "FP results may deviate slightly from other platforms.")
1198 if not have_png
and env
['USE_PNG']:
1199 warning("<png.h> not available; forcing USE_PNG to False in",
1201 env
['USE_PNG'] = False
1204 env
.Append(LIBS
=['png'])
1207 env
.Append(LIBS
=['efence'])
1211 warning("Can not enable KVM, host seems to lack KVM support")
1212 env
['USE_KVM'] = False
1213 elif not is_isa_kvm_compatible(env
['TARGET_ISA']):
1214 print("Info: KVM support disabled due to unsupported host and "
1215 "target ISA combination")
1216 env
['USE_KVM'] = False
1218 if env
['USE_TUNTAP']:
1220 warning("Can't connect EtherTap with a tap device.")
1221 env
['USE_TUNTAP'] = False
1223 if env
['BUILD_GPU']:
1224 env
.Append(CPPDEFINES
=['BUILD_GPU'])
1226 # Warn about missing optional functionality
1228 if not main
['HAVE_PERF_ATTR_EXCLUDE_HOST']:
1229 warning("perf_event headers lack support for the exclude_host "
1230 "attribute. KVM instruction counts will be inaccurate.")
1232 # Save sticky variable settings back to current variables file
1233 sticky_vars
.Save(current_vars_file
, env
)
1236 env
.Append(CCFLAGS
=['-msse2'])
1238 env
.Append(CCFLAGS
='$CCFLAGS_EXTRA')
1239 env
.Append(LINKFLAGS
='$LDFLAGS_EXTRA')
1241 # The src/SConscript file sets up the build rules in 'env' according
1242 # to the configured variables. It returns a list of environments,
1243 # one for each variant build (debug, opt, etc.)
1244 SConscript('src/SConscript', variant_dir
=variant_path
,
1245 exports
=['env', 'marshal_env'])
1247 atexit
.register(summarize_warnings
)