3 # Copyright (c) 2013, 2015 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 # Authors: Steve Reinhardt
46 ###################################################
48 # SCons top-level build description (SConstruct) file.
50 # While in this directory ('gem5'), just type 'scons' to build the default
51 # configuration (see below), or type 'scons build/<CONFIG>/<binary>'
52 # to build some other configuration (e.g., 'build/ALPHA/gem5.opt' for
53 # the optimized full-system version).
55 # You can build gem5 in a different directory as long as there is a
56 # 'build/<CONFIG>' somewhere along the target path. The build system
57 # expects that all configs under the same build directory are being
58 # built for the same host system.
62 # The following two commands are equivalent. The '-u' option tells
63 # scons to search up the directory tree for this SConstruct file.
64 # % cd <path-to-src>/gem5 ; scons build/ALPHA/gem5.debug
65 # % cd <path-to-src>/gem5/build/ALPHA; scons -u gem5.debug
67 # The following two commands are equivalent and demonstrate building
68 # in a directory outside of the source tree. The '-C' option tells
69 # scons to chdir to the specified directory to find this SConstruct
71 # % cd <path-to-src>/gem5 ; scons /local/foo/build/ALPHA/gem5.debug
72 # % cd /local/foo/build/ALPHA; scons -C <path-to-src>/gem5 gem5.debug
74 # You can use 'scons -H' to print scons options. If you're in this
75 # 'gem5' directory (or use -u or -C to tell scons where to find this
76 # file), you can use 'scons -h' to print all the gem5-specific build
79 ###################################################
81 # Check for recent-enough Python and SCons versions.
83 # Really old versions of scons only take two options for the
84 # function, so check once without the revision and once with the
85 # revision, the first instance will fail for stuff other than
86 # 0.98, and the second will fail for 0.98.0
87 EnsureSConsVersion(0, 98)
88 EnsureSConsVersion(0, 98, 1)
91 For more details, see:
92 http://gem5.org/Dependencies
96 # We ensure the python version early because because python-config
99 EnsurePythonVersion(2, 5)
100 except SystemExit, e
:
102 You can use a non-default installation of the Python interpreter by
103 rearranging your PATH so that scons finds the non-default 'python' and
104 'python-config' first.
106 For more details, see:
107 http://gem5.org/wiki/index.php/Using_a_non-default_Python_installation
111 # Global Python includes
118 from os
import mkdir
, environ
119 from os
.path
import abspath
, basename
, dirname
, expanduser
, normpath
120 from os
.path
import exists
, isdir
, isfile
121 from os
.path
import join
as joinpath
, split
as splitpath
127 extra_python_paths
= [
128 Dir('src/python').srcnode().abspath
, # gem5 includes
129 Dir('ext/ply').srcnode().abspath
, # ply is used by several files
132 sys
.path
[1:1] = extra_python_paths
134 from m5
.util
import compareVersions
, readCommand
135 from m5
.util
.terminal
import get_termcap
146 # There's a bug in scons in that (1) by default, the help texts from
147 # AddOption() are supposed to be displayed when you type 'scons -h'
148 # and (2) you can override the help displayed by 'scons -h' using the
149 # Help() function, but these two features are incompatible: once
150 # you've overridden the help text using Help(), there's no way to get
151 # at the help texts from AddOptions. See:
152 # http://scons.tigris.org/issues/show_bug.cgi?id=2356
153 # http://scons.tigris.org/issues/show_bug.cgi?id=2611
154 # This hack lets us extract the help text from AddOptions and
155 # re-inject it via Help(). Ideally someday this bug will be fixed and
156 # we can just use AddOption directly.
157 def AddLocalOption(*args
, **kwargs
):
160 help = " " + ", ".join(args
)
163 if length
>= col_width
:
164 help += "\n" + " " * col_width
166 help += " " * (col_width
- length
)
167 help += kwargs
["help"]
168 help_texts
["options"] += help + "\n"
170 AddOption(*args
, **kwargs
)
172 AddLocalOption('--colors', dest
='use_colors', action
='store_true',
173 help="Add color to abbreviated scons output")
174 AddLocalOption('--no-colors', dest
='use_colors', action
='store_false',
175 help="Don't add color to abbreviated scons output")
176 AddLocalOption('--with-cxx-config', dest
='with_cxx_config',
178 help="Build with support for C++-based configuration")
179 AddLocalOption('--default', dest
='default', type='string', action
='store',
180 help='Override which build_opts file to use for defaults')
181 AddLocalOption('--ignore-style', dest
='ignore_style', action
='store_true',
182 help='Disable style checking hooks')
183 AddLocalOption('--no-lto', dest
='no_lto', action
='store_true',
184 help='Disable Link-Time Optimization for fast')
185 AddLocalOption('--update-ref', dest
='update_ref', action
='store_true',
186 help='Update test reference outputs')
187 AddLocalOption('--verbose', dest
='verbose', action
='store_true',
188 help='Print full tool command lines')
189 AddLocalOption('--without-python', dest
='without_python',
191 help='Build without Python configuration support')
192 AddLocalOption('--without-tcmalloc', dest
='without_tcmalloc',
194 help='Disable linking against tcmalloc')
195 AddLocalOption('--with-ubsan', dest
='with_ubsan', action
='store_true',
196 help='Build with Undefined Behavior Sanitizer if available')
198 termcap
= get_termcap(GetOption('use_colors'))
200 ########################################################################
202 # Set up the main build environment.
204 ########################################################################
206 # export TERM so that clang reports errors in color
207 use_vars
= set([ 'AS', 'AR', 'CC', 'CXX', 'HOME', 'LD_LIBRARY_PATH',
208 'LIBRARY_PATH', 'PATH', 'PKG_CONFIG_PATH', 'PROTOC',
209 'PYTHONPATH', 'RANLIB', 'SWIG', 'TERM' ])
212 "CCACHE_", # ccache (caching compiler wrapper) configuration
213 "CCC_", # clang static analyzer configuration
214 "DISTCC_", # distcc (distributed compiler wrapper) configuration
215 "INCLUDE_SERVER_", # distcc pump server settings
216 "M5", # M5 configuration (e.g., path to kernels)
220 for key
,val
in sorted(os
.environ
.iteritems()):
221 if key
in use_vars
or \
222 any([key
.startswith(prefix
) for prefix
in use_prefixes
]):
225 # Tell scons to avoid implicit command dependencies to avoid issues
226 # with the param wrappes being compiled twice (see
227 # http://scons.tigris.org/issues/show_bug.cgi?id=2811)
228 main
= Environment(ENV
=use_env
, IMPLICIT_COMMAND_DEPENDENCIES
=0)
229 main
.Decider('MD5-timestamp')
230 main
.root
= Dir(".") # The current directory (where this file lives).
231 main
.srcdir
= Dir("src") # The source directory
233 main_dict_keys
= main
.Dictionary().keys()
235 # Check that we have a C/C++ compiler
236 if not ('CC' in main_dict_keys
and 'CXX' in main_dict_keys
):
237 print "No C++ compiler installed (package g++ on Ubuntu and RedHat)"
240 # Check that swig is present
241 if not 'SWIG' in main_dict_keys
:
242 print "swig is not installed (package swig on Ubuntu and RedHat)"
245 # add useful python code PYTHONPATH so it can be used by subprocesses
247 main
.AppendENVPath('PYTHONPATH', extra_python_paths
)
249 ########################################################################
253 # If the gem5 directory is a mercurial repository, we should do some
256 ########################################################################
258 hgdir
= main
.root
.Dir(".hg")
260 mercurial_style_message
= """
261 You're missing the gem5 style hook, which automatically checks your code
262 against the gem5 style rules on hg commit and qrefresh commands. This
263 script will now install the hook in your .hg/hgrc file.
264 Press enter to continue, or ctrl-c to abort: """
266 mercurial_style_hook
= """
267 # The following lines were automatically added by gem5/SConstruct
268 # to provide the gem5 style-checking hooks
270 style = %s/util/style.py
273 pretxncommit.style = python:style.check_style
274 pre-qrefresh.style = python:style.check_style
275 # End of SConstruct additions
277 """ % (main
.root
.abspath
)
279 mercurial_lib_not_found
= """
280 Mercurial libraries cannot be found, ignoring style hook. If
281 you are a gem5 developer, please fix this and run the style
282 hook. It is important.
285 # Check for style hook and prompt for installation if it's not there.
286 # Skip this if --ignore-style was specified, there's no .hg dir to
287 # install a hook in, or there's no interactive terminal to prompt.
288 if not GetOption('ignore_style') and hgdir
.exists() and sys
.stdin
.isatty():
291 from mercurial
import ui
293 ui
.readconfig(hgdir
.File('hgrc').abspath
)
294 style_hook
= ui
.config('hooks', 'pretxncommit.style', None) and \
295 ui
.config('hooks', 'pre-qrefresh.style', None)
297 print mercurial_lib_not_found
300 print mercurial_style_message
,
301 # continue unless user does ctrl-c/ctrl-d etc.
305 print "Input exception, exiting scons.\n"
307 hgrc_path
= '%s/.hg/hgrc' % main
.root
.abspath
308 print "Adding style hook to", hgrc_path
, "\n"
310 hgrc
= open(hgrc_path
, 'a')
311 hgrc
.write(mercurial_style_hook
)
314 print "Error updating", hgrc_path
318 ###################################################
320 # Figure out which configurations to set up based on the path(s) of
323 ###################################################
325 # Find default configuration & binary.
326 Default(environ
.get('M5_DEFAULT_BINARY', 'build/ALPHA/gem5.debug'))
328 # helper function: find last occurrence of element in list
329 def rfind(l
, elt
, offs
= -1):
330 for i
in range(len(l
)+offs
, 0, -1):
333 raise ValueError, "element not found"
335 # Take a list of paths (or SCons Nodes) and return a list with all
336 # paths made absolute and ~-expanded. Paths will be interpreted
337 # relative to the launch directory unless a different root is provided
338 def makePathListAbsolute(path_list
, root
=GetLaunchDir()):
339 return [abspath(joinpath(root
, expanduser(str(p
))))
342 # Each target must have 'build' in the interior of the path; the
343 # directory below this will determine the build parameters. For
344 # example, for target 'foo/bar/build/ALPHA_SE/arch/alpha/blah.do' we
345 # recognize that ALPHA_SE specifies the configuration because it
346 # follow 'build' in the build path.
348 # The funky assignment to "[:]" is needed to replace the list contents
349 # in place rather than reassign the symbol to a new list, which
350 # doesn't work (obviously!).
351 BUILD_TARGETS
[:] = makePathListAbsolute(BUILD_TARGETS
)
353 # Generate a list of the unique build roots and configs that the
354 # collected targets reference.
357 for t
in BUILD_TARGETS
:
358 path_dirs
= t
.split('/')
360 build_top
= rfind(path_dirs
, 'build', -2)
362 print "Error: no non-leaf 'build' dir found on target path", t
364 this_build_root
= joinpath('/',*path_dirs
[:build_top
+1])
366 build_root
= this_build_root
368 if this_build_root
!= build_root
:
369 print "Error: build targets not under same build root\n"\
370 " %s\n %s" % (build_root
, this_build_root
)
372 variant_path
= joinpath('/',*path_dirs
[:build_top
+2])
373 if variant_path
not in variant_paths
:
374 variant_paths
.append(variant_path
)
376 # Make sure build_root exists (might not if this is the first build there)
377 if not isdir(build_root
):
379 main
['BUILDROOT'] = build_root
383 main
.SConsignFile(joinpath(build_root
, "sconsign"))
385 # Default duplicate option is to use hard links, but this messes up
386 # when you use emacs to edit a file in the target dir, as emacs moves
387 # file to file~ then copies to file, breaking the link. Symbolic
388 # (soft) links work better.
389 main
.SetOption('duplicate', 'soft-copy')
392 # Set up global sticky variables... these are common to an entire build
393 # tree (not specific to a particular build like ALPHA_SE)
396 global_vars_file
= joinpath(build_root
, 'variables.global')
398 global_vars
= Variables(global_vars_file
, args
=ARGUMENTS
)
400 global_vars
.AddVariables(
401 ('CC', 'C compiler', environ
.get('CC', main
['CC'])),
402 ('CXX', 'C++ compiler', environ
.get('CXX', main
['CXX'])),
403 ('SWIG', 'SWIG tool', environ
.get('SWIG', main
['SWIG'])),
404 ('PROTOC', 'protoc tool', environ
.get('PROTOC', 'protoc')),
405 ('BATCH', 'Use batch pool for build and tests', False),
406 ('BATCH_CMD', 'Batch pool submission command name', 'qdo'),
407 ('M5_BUILD_CACHE', 'Cache built objects in this directory', False),
408 ('EXTRAS', 'Add extra directories to the compilation', '')
411 # Update main environment with values from ARGUMENTS & global_vars_file
412 global_vars
.Update(main
)
413 help_texts
["global_vars"] += global_vars
.GenerateHelpText(main
)
415 # Save sticky variable settings back to current variables file
416 global_vars
.Save(global_vars_file
, main
)
418 # Parse EXTRAS variable to build list of all directories where we're
419 # look for sources etc. This list is exported as extras_dir_list.
420 base_dir
= main
.srcdir
.abspath
422 extras_dir_list
= makePathListAbsolute(main
['EXTRAS'].split(':'))
427 Export('extras_dir_list')
429 # the ext directory should be on the #includes path
430 main
.Append(CPPPATH
=[Dir('ext')])
432 def strip_build_path(path
, env
):
434 variant_base
= env
['BUILDROOT'] + os
.path
.sep
435 if path
.startswith(variant_base
):
436 path
= path
[len(variant_base
):]
437 elif path
.startswith('build/'):
441 # Generate a string of the form:
442 # common/path/prefix/src1, src2 -> tgt1, tgt2
443 # to print while building.
444 class Transform(object):
445 # all specific color settings should be here and nowhere else
446 tool_color
= termcap
.Normal
447 pfx_color
= termcap
.Yellow
448 srcs_color
= termcap
.Yellow
+ termcap
.Bold
449 arrow_color
= termcap
.Blue
+ termcap
.Bold
450 tgts_color
= termcap
.Yellow
+ termcap
.Bold
452 def __init__(self
, tool
, max_sources
=99):
453 self
.format
= self
.tool_color
+ (" [%8s] " % tool
) \
454 + self
.pfx_color
+ "%s" \
455 + self
.srcs_color
+ "%s" \
456 + self
.arrow_color
+ " -> " \
457 + self
.tgts_color
+ "%s" \
459 self
.max_sources
= max_sources
461 def __call__(self
, target
, source
, env
, for_signature
=None):
462 # truncate source list according to max_sources param
463 source
= source
[0:self
.max_sources
]
465 return strip_build_path(str(f
), env
)
467 srcs
= map(strip
, source
)
470 tgts
= map(strip
, target
)
471 # surprisingly, os.path.commonprefix is a dumb char-by-char string
472 # operation that has nothing to do with paths.
473 com_pfx
= os
.path
.commonprefix(srcs
+ tgts
)
474 com_pfx_len
= len(com_pfx
)
476 # do some cleanup and sanity checking on common prefix
477 if com_pfx
[-1] == ".":
478 # prefix matches all but file extension: ok
479 # back up one to change 'foo.cc -> o' to 'foo.cc -> .o'
480 com_pfx
= com_pfx
[0:-1]
481 elif com_pfx
[-1] == "/":
482 # common prefix is directory path: OK
485 src0_len
= len(srcs
[0])
486 tgt0_len
= len(tgts
[0])
487 if src0_len
== com_pfx_len
:
488 # source is a substring of target, OK
490 elif tgt0_len
== com_pfx_len
:
491 # target is a substring of source, need to back up to
492 # avoid empty string on RHS of arrow
493 sep_idx
= com_pfx
.rfind(".")
495 com_pfx
= com_pfx
[0:sep_idx
]
498 elif src0_len
> com_pfx_len
and srcs
[0][com_pfx_len
] == ".":
499 # still splitting at file extension: ok
502 # probably a fluke; ignore it
504 # recalculate length in case com_pfx was modified
505 com_pfx_len
= len(com_pfx
)
507 f
= map(lambda s
: s
[com_pfx_len
:], files
)
509 return self
.format
% (com_pfx
, fmt(srcs
), fmt(tgts
))
513 # enable the regression script to use the termcap
514 main
['TERMCAP'] = termcap
516 if GetOption('verbose'):
517 def MakeAction(action
, string
, *args
, **kwargs
):
518 return Action(action
, *args
, **kwargs
)
521 main
['CCCOMSTR'] = Transform("CC")
522 main
['CXXCOMSTR'] = Transform("CXX")
523 main
['ASCOMSTR'] = Transform("AS")
524 main
['SWIGCOMSTR'] = Transform("SWIG")
525 main
['ARCOMSTR'] = Transform("AR", 0)
526 main
['LINKCOMSTR'] = Transform("LINK", 0)
527 main
['RANLIBCOMSTR'] = Transform("RANLIB", 0)
528 main
['M4COMSTR'] = Transform("M4")
529 main
['SHCCCOMSTR'] = Transform("SHCC")
530 main
['SHCXXCOMSTR'] = Transform("SHCXX")
533 # Initialize the Link-Time Optimization (LTO) flags
534 main
['LTO_CCFLAGS'] = []
535 main
['LTO_LDFLAGS'] = []
537 # According to the readme, tcmalloc works best if the compiler doesn't
538 # assume that we're using the builtin malloc and friends. These flags
539 # are compiler-specific, so we need to set them after we detect which
540 # compiler we're using.
541 main
['TCMALLOC_CCFLAGS'] = []
543 CXX_version
= readCommand([main
['CXX'],'--version'], exception
=False)
544 CXX_V
= readCommand([main
['CXX'],'-V'], exception
=False)
546 main
['GCC'] = CXX_version
and CXX_version
.find('g++') >= 0
547 main
['CLANG'] = CXX_version
and CXX_version
.find('clang') >= 0
548 if main
['GCC'] + main
['CLANG'] > 1:
549 print 'Error: How can we have two at the same time?'
552 # Set up default C++ compiler flags
553 if main
['GCC'] or main
['CLANG']:
554 # As gcc and clang share many flags, do the common parts here
555 main
.Append(CCFLAGS
=['-pipe'])
556 main
.Append(CCFLAGS
=['-fno-strict-aliasing'])
557 # Enable -Wall and then disable the few warnings that we
558 # consistently violate
559 main
.Append(CCFLAGS
=['-Wall', '-Wno-sign-compare', '-Wundef'])
560 # We always compile using C++11
561 main
.Append(CXXFLAGS
=['-std=c++11'])
562 # Add selected sanity checks from -Wextra
563 main
.Append(CXXFLAGS
=['-Wmissing-field-initializers',
564 '-Woverloaded-virtual'])
566 print termcap
.Yellow
+ termcap
.Bold
+ 'Error' + termcap
.Normal
,
567 print "Don't know what compiler options to use for your compiler."
568 print termcap
.Yellow
+ ' compiler:' + termcap
.Normal
, main
['CXX']
569 print termcap
.Yellow
+ ' version:' + termcap
.Normal
,
571 print termcap
.Yellow
+ termcap
.Bold
+ "COMMAND NOT FOUND!" +\
574 print CXX_version
.replace('\n', '<nl>')
575 print " If you're trying to use a compiler other than GCC"
576 print " or clang, there appears to be something wrong with your"
577 print " environment."
579 print " If you are trying to use a compiler other than those listed"
580 print " above you will need to ease fix SConstruct and "
581 print " src/SConscript to support that compiler."
585 # Check for a supported version of gcc. >= 4.7 is chosen for its
586 # level of c++11 support. See
587 # http://gcc.gnu.org/projects/cxx0x.html for details.
588 gcc_version
= readCommand([main
['CXX'], '-dumpversion'], exception
=False)
589 if compareVersions(gcc_version
, "4.7") < 0:
590 print 'Error: gcc version 4.7 or newer required.'
591 print ' Installed version:', gcc_version
594 main
['GCC_VERSION'] = gcc_version
596 # gcc from version 4.8 and above generates "rep; ret" instructions
597 # to avoid performance penalties on certain AMD chips. Older
598 # assemblers detect this as an error, "Error: expecting string
599 # instruction after `rep'"
600 if compareVersions(gcc_version
, "4.8") > 0:
601 as_version_raw
= readCommand([main
['AS'], '-v', '/dev/null'],
602 exception
=False).split()
604 # version strings may contain extra distro-specific
605 # qualifiers, so play it safe and keep only what comes before
607 as_version
= as_version_raw
[-1].split('-')[0] if as_version_raw \
610 if not as_version
or compareVersions(as_version
, "2.23") < 0:
611 print termcap
.Yellow
+ termcap
.Bold
+ \
612 'Warning: This combination of gcc and binutils have' + \
613 ' known incompatibilities.\n' + \
614 ' If you encounter build problems, please update ' + \
615 'binutils to 2.23.' + \
618 # Make sure we warn if the user has requested to compile with the
619 # Undefined Benahvior Sanitizer and this version of gcc does not
621 if GetOption('with_ubsan') and \
622 compareVersions(gcc_version
, '4.9') < 0:
623 print termcap
.Yellow
+ termcap
.Bold
+ \
624 'Warning: UBSan is only supported using gcc 4.9 and later.' + \
627 # Add the appropriate Link-Time Optimization (LTO) flags
628 # unless LTO is explicitly turned off. Note that these flags
629 # are only used by the fast target.
630 if not GetOption('no_lto'):
631 # Pass the LTO flag when compiling to produce GIMPLE
632 # output, we merely create the flags here and only append
634 main
['LTO_CCFLAGS'] = ['-flto=%d' % GetOption('num_jobs')]
636 # Use the same amount of jobs for LTO as we are running
638 main
['LTO_LDFLAGS'] = ['-flto=%d' % GetOption('num_jobs')]
640 main
.Append(TCMALLOC_CCFLAGS
=['-fno-builtin-malloc', '-fno-builtin-calloc',
641 '-fno-builtin-realloc', '-fno-builtin-free'])
644 # Check for a supported version of clang, >= 3.1 is needed to
645 # support similar features as gcc 4.7. See
646 # http://clang.llvm.org/cxx_status.html for details
647 clang_version_re
= re
.compile(".* version (\d+\.\d+)")
648 clang_version_match
= clang_version_re
.search(CXX_version
)
649 if (clang_version_match
):
650 clang_version
= clang_version_match
.groups()[0]
651 if compareVersions(clang_version
, "3.1") < 0:
652 print 'Error: clang version 3.1 or newer required.'
653 print ' Installed version:', clang_version
656 print 'Error: Unable to determine clang version.'
659 # clang has a few additional warnings that we disable,
660 # tautological comparisons are allowed due to unsigned integers
661 # being compared to constants that happen to be 0, and extraneous
662 # parantheses are allowed due to Ruby's printing of the AST,
663 # finally self assignments are allowed as the generated CPU code
665 main
.Append(CCFLAGS
=['-Wno-tautological-compare',
668 # Some versions of libstdc++ (4.8?) seem to
669 # use struct hash and class hash
671 '-Wno-mismatched-tags',
674 main
.Append(TCMALLOC_CCFLAGS
=['-fno-builtin'])
676 # On Mac OS X/Darwin we need to also use libc++ (part of XCode) as
677 # opposed to libstdc++, as the later is dated.
678 if sys
.platform
== "darwin":
679 main
.Append(CXXFLAGS
=['-stdlib=libc++'])
680 main
.Append(LIBS
=['c++'])
683 print termcap
.Yellow
+ termcap
.Bold
+ 'Error' + termcap
.Normal
,
684 print "Don't know what compiler options to use for your compiler."
685 print termcap
.Yellow
+ ' compiler:' + termcap
.Normal
, main
['CXX']
686 print termcap
.Yellow
+ ' version:' + termcap
.Normal
,
688 print termcap
.Yellow
+ termcap
.Bold
+ "COMMAND NOT FOUND!" +\
691 print CXX_version
.replace('\n', '<nl>')
692 print " If you're trying to use a compiler other than GCC"
693 print " or clang, there appears to be something wrong with your"
694 print " environment."
696 print " If you are trying to use a compiler other than those listed"
697 print " above you will need to ease fix SConstruct and "
698 print " src/SConscript to support that compiler."
701 # Set up common yacc/bison flags (needed for Ruby)
702 main
['YACCFLAGS'] = '-d'
703 main
['YACCHXXFILESUFFIX'] = '.hh'
705 # Do this after we save setting back, or else we'll tack on an
706 # extra 'qdo' every time we run scons.
708 main
['CC'] = main
['BATCH_CMD'] + ' ' + main
['CC']
709 main
['CXX'] = main
['BATCH_CMD'] + ' ' + main
['CXX']
710 main
['AS'] = main
['BATCH_CMD'] + ' ' + main
['AS']
711 main
['AR'] = main
['BATCH_CMD'] + ' ' + main
['AR']
712 main
['RANLIB'] = main
['BATCH_CMD'] + ' ' + main
['RANLIB']
714 if sys
.platform
== 'cygwin':
715 # cygwin has some header file issues...
716 main
.Append(CCFLAGS
=["-Wno-uninitialized"])
718 # Check for the protobuf compiler
719 protoc_version
= readCommand([main
['PROTOC'], '--version'],
720 exception
='').split()
722 # First two words should be "libprotoc x.y.z"
723 if len(protoc_version
) < 2 or protoc_version
[0] != 'libprotoc':
724 print termcap
.Yellow
+ termcap
.Bold
+ \
725 'Warning: Protocol buffer compiler (protoc) not found.\n' + \
726 ' Please install protobuf-compiler for tracing support.' + \
728 main
['PROTOC'] = False
730 # Based on the availability of the compress stream wrappers,
732 min_protoc_version
= '2.1.0'
733 if compareVersions(protoc_version
[1], min_protoc_version
) < 0:
734 print termcap
.Yellow
+ termcap
.Bold
+ \
735 'Warning: protoc version', min_protoc_version
, \
736 'or newer required.\n' + \
737 ' Installed version:', protoc_version
[1], \
739 main
['PROTOC'] = False
741 # Attempt to determine the appropriate include path and
742 # library path using pkg-config, that means we also need to
743 # check for pkg-config. Note that it is possible to use
744 # protobuf without the involvement of pkg-config. Later on we
745 # check go a library config check and at that point the test
746 # will fail if libprotobuf cannot be found.
747 if readCommand(['pkg-config', '--version'], exception
=''):
749 # Attempt to establish what linking flags to add for protobuf
751 main
.ParseConfig('pkg-config --cflags --libs-only-L protobuf')
753 print termcap
.Yellow
+ termcap
.Bold
+ \
754 'Warning: pkg-config could not get protobuf flags.' + \
758 if not main
.has_key('SWIG'):
759 print 'Error: SWIG utility not found.'
760 print ' Please install (see http://www.swig.org) and retry.'
763 # Check for appropriate SWIG version
764 swig_version
= readCommand([main
['SWIG'], '-version'], exception
='').split()
765 # First 3 words should be "SWIG Version x.y.z"
766 if len(swig_version
) < 3 or \
767 swig_version
[0] != 'SWIG' or swig_version
[1] != 'Version':
768 print 'Error determining SWIG version.'
771 min_swig_version
= '2.0.4'
772 if compareVersions(swig_version
[2], min_swig_version
) < 0:
773 print 'Error: SWIG version', min_swig_version
, 'or newer required.'
774 print ' Installed version:', swig_version
[2]
777 # Check for known incompatibilities. The standard library shipped with
778 # gcc >= 4.9 does not play well with swig versions prior to 3.0
779 if main
['GCC'] and compareVersions(gcc_version
, '4.9') >= 0 and \
780 compareVersions(swig_version
[2], '3.0') < 0:
781 print termcap
.Yellow
+ termcap
.Bold
+ \
782 'Warning: This combination of gcc and swig have' + \
783 ' known incompatibilities.\n' + \
784 ' If you encounter build problems, please update ' + \
785 'swig to 3.0 or later.' + \
788 # Set up SWIG flags & scanner
789 swig_flags
=Split('-c++ -python -modern -templatereduce $_CPPINCFLAGS')
790 main
.Append(SWIGFLAGS
=swig_flags
)
792 # Check for 'timeout' from GNU coreutils. If present, regressions will
793 # be run with a time limit. We require version 8.13 since we rely on
794 # support for the '--foreground' option.
795 timeout_lines
= readCommand(['timeout', '--version'],
796 exception
='').splitlines()
797 # Get the first line and tokenize it
798 timeout_version
= timeout_lines
[0].split() if timeout_lines
else []
799 main
['TIMEOUT'] = timeout_version
and \
800 compareVersions(timeout_version
[-1], '8.13') >= 0
802 # filter out all existing swig scanners, they mess up the dependency
803 # stuff for some reason
805 for scanner
in main
['SCANNERS']:
806 skeys
= scanner
.skeys
810 if isinstance(skeys
, (list, tuple)) and '.i' in skeys
:
813 scanners
.append(scanner
)
815 # add the new swig scanner that we like better
816 from SCons
.Scanner
import ClassicCPP
as CPPScanner
817 swig_inc_re
= '^[ \t]*[%,#][ \t]*(?:include|import)[ \t]*(<|")([^>"]+)(>|")'
818 scanners
.append(CPPScanner("SwigScan", [ ".i" ], "CPPPATH", swig_inc_re
))
820 # replace the scanners list that has what we want
821 main
['SCANNERS'] = scanners
823 # Add a custom Check function to test for structure members.
824 def CheckMember(context
, include
, decl
, member
, include_quotes
="<>"):
825 context
.Message("Checking for member %s in %s..." %
831 (void)test.%(member)s;
834 """ % { "header" : include_quotes
[0] + include
+ include_quotes
[1],
839 ret
= context
.TryCompile(text
, extension
=".cc")
843 # Platform-specific configuration. Note again that we assume that all
844 # builds under a given build root run on the same host platform.
845 conf
= Configure(main
,
846 conf_dir
= joinpath(build_root
, '.scons_config'),
847 log_file
= joinpath(build_root
, 'scons_config.log'),
849 'CheckMember' : CheckMember
,
852 # Check if we should compile a 64 bit binary on Mac OS X/Darwin
855 uname
= platform
.uname()
856 if uname
[0] == 'Darwin' and compareVersions(uname
[2], '9.0.0') >= 0:
857 if int(readCommand('sysctl -n hw.cpu64bit_capable')[0]):
858 main
.Append(CCFLAGS
=['-arch', 'x86_64'])
859 main
.Append(CFLAGS
=['-arch', 'x86_64'])
860 main
.Append(LINKFLAGS
=['-arch', 'x86_64'])
861 main
.Append(ASFLAGS
=['-arch', 'x86_64'])
865 # Recent versions of scons substitute a "Null" object for Configure()
866 # when configuration isn't necessary, e.g., if the "--help" option is
867 # present. Unfortuantely this Null object always returns false,
868 # breaking all our configuration checks. We replace it with our own
869 # more optimistic null object that returns True instead.
871 def NullCheck(*args
, **kwargs
):
875 def __init__(self
, env
):
879 def __getattr__(self
, mname
):
882 conf
= NullConf(main
)
884 # Cache build files in the supplied directory.
885 if main
['M5_BUILD_CACHE']:
886 print 'Using build cache located at', main
['M5_BUILD_CACHE']
887 CacheDir(main
['M5_BUILD_CACHE'])
889 if not GetOption('without_python'):
890 # Find Python include and library directories for embedding the
891 # interpreter. We rely on python-config to resolve the appropriate
892 # includes and linker flags. ParseConfig does not seem to understand
893 # the more exotic linker flags such as -Xlinker and -export-dynamic so
894 # we add them explicitly below. If you want to link in an alternate
895 # version of python, see above for instructions on how to invoke
896 # scons with the appropriate PATH set.
898 # First we check if python2-config exists, else we use python-config
899 python_config
= readCommand(['which', 'python2-config'],
900 exception
='').strip()
901 if not os
.path
.exists(python_config
):
902 python_config
= readCommand(['which', 'python-config'],
903 exception
='').strip()
904 py_includes
= readCommand([python_config
, '--includes'],
905 exception
='').split()
906 # Strip the -I from the include folders before adding them to the
908 main
.Append(CPPPATH
=map(lambda inc
: inc
[2:], py_includes
))
910 # Read the linker flags and split them into libraries and other link
911 # flags. The libraries are added later through the call the CheckLib.
912 py_ld_flags
= readCommand([python_config
, '--ldflags'],
913 exception
='').split()
915 for lib
in py_ld_flags
:
916 if not lib
.startswith('-l'):
917 main
.Append(LINKFLAGS
=[lib
])
920 if lib
not in py_libs
:
923 # verify that this stuff works
924 if not conf
.CheckHeader('Python.h', '<>'):
925 print "Error: can't find Python.h header in", py_includes
926 print "Install Python headers (package python-dev on Ubuntu and RedHat)"
930 if not conf
.CheckLib(lib
):
931 print "Error: can't find library %s required by python" % lib
934 # On Solaris you need to use libsocket for socket ops
935 if not conf
.CheckLibWithHeader(None, 'sys/socket.h', 'C++', 'accept(0,0,0);'):
936 if not conf
.CheckLibWithHeader('socket', 'sys/socket.h', 'C++', 'accept(0,0,0);'):
937 print "Can't find library with socket calls (e.g. accept())"
940 # Check for zlib. If the check passes, libz will be automatically
941 # added to the LIBS environment variable.
942 if not conf
.CheckLibWithHeader('z', 'zlib.h', 'C++','zlibVersion();'):
943 print 'Error: did not find needed zlib compression library '\
944 'and/or zlib.h header file.'
945 print ' Please install zlib and try again.'
948 # If we have the protobuf compiler, also make sure we have the
949 # development libraries. If the check passes, libprotobuf will be
950 # automatically added to the LIBS environment variable. After
951 # this, we can use the HAVE_PROTOBUF flag to determine if we have
952 # got both protoc and libprotobuf available.
953 main
['HAVE_PROTOBUF'] = main
['PROTOC'] and \
954 conf
.CheckLibWithHeader('protobuf', 'google/protobuf/message.h',
955 'C++', 'GOOGLE_PROTOBUF_VERIFY_VERSION;')
957 # If we have the compiler but not the library, print another warning.
958 if main
['PROTOC'] and not main
['HAVE_PROTOBUF']:
959 print termcap
.Yellow
+ termcap
.Bold
+ \
960 'Warning: did not find protocol buffer library and/or headers.\n' + \
961 ' Please install libprotobuf-dev for tracing support.' + \
966 conf
.CheckLibWithHeader(None, 'time.h', 'C',
967 'clock_nanosleep(0,0,NULL,NULL);') or \
968 conf
.CheckLibWithHeader('rt', 'time.h', 'C',
969 'clock_nanosleep(0,0,NULL,NULL);')
971 have_posix_timers
= \
972 conf
.CheckLibWithHeader([None, 'rt'], [ 'time.h', 'signal.h' ], 'C',
973 'timer_create(CLOCK_MONOTONIC, NULL, NULL);')
975 if not GetOption('without_tcmalloc'):
976 if conf
.CheckLib('tcmalloc'):
977 main
.Append(CCFLAGS
=main
['TCMALLOC_CCFLAGS'])
978 elif conf
.CheckLib('tcmalloc_minimal'):
979 main
.Append(CCFLAGS
=main
['TCMALLOC_CCFLAGS'])
981 print termcap
.Yellow
+ termcap
.Bold
+ \
982 "You can get a 12% performance improvement by "\
983 "installing tcmalloc (libgoogle-perftools-dev package "\
984 "on Ubuntu or RedHat)." + termcap
.Normal
986 if not have_posix_clock
:
987 print "Can't find library for POSIX clocks."
989 # Check for <fenv.h> (C99 FP environment control)
990 have_fenv
= conf
.CheckHeader('fenv.h', '<>')
992 print "Warning: Header file <fenv.h> not found."
993 print " This host has no IEEE FP rounding mode control."
995 # Check if we should enable KVM-based hardware virtualization. The API
996 # we rely on exists since version 2.6.36 of the kernel, but somehow
997 # the KVM_API_VERSION does not reflect the change. We test for one of
998 # the types as a fall back.
999 have_kvm
= conf
.CheckHeader('linux/kvm.h', '<>')
1001 print "Info: Compatible header file <linux/kvm.h> not found, " \
1002 "disabling KVM support."
1004 # x86 needs support for xsave. We test for the structure here since we
1005 # won't be able to run new tests by the time we know which ISA we're
1007 have_kvm_xsave
= conf
.CheckTypeSize('struct kvm_xsave',
1008 '#include <linux/kvm.h>') != 0
1010 # Check if the requested target ISA is compatible with the host
1011 def is_isa_kvm_compatible(isa
):
1014 host_isa
= platform
.machine()
1016 print "Warning: Failed to determine host ISA."
1019 if not have_posix_timers
:
1020 print "Warning: Can not enable KVM, host seems to lack support " \
1025 return host_isa
in ( "armv7l", "aarch64" )
1027 if host_isa
!= "x86_64":
1030 if not have_kvm_xsave
:
1031 print "KVM on x86 requires xsave support in kernel headers."
1039 # Check if the exclude_host attribute is available. We want this to
1040 # get accurate instruction counts in KVM.
1041 main
['HAVE_PERF_ATTR_EXCLUDE_HOST'] = conf
.CheckMember(
1042 'linux/perf_event.h', 'struct perf_event_attr', 'exclude_host')
1045 ######################################################################
1047 # Finish the configuration
1049 main
= conf
.Finish()
1051 ######################################################################
1053 # Collect all non-global variables
1056 # Define the universe of supported ISAs
1058 Export('all_isa_list')
1060 class CpuModel(object):
1061 '''The CpuModel class encapsulates everything the ISA parser needs to
1062 know about a particular CPU model.'''
1064 # Dict of available CPU model objects. Accessible as CpuModel.dict.
1067 # Constructor. Automatically adds models to CpuModel.dict.
1068 def __init__(self
, name
, default
=False):
1069 self
.name
= name
# name of model
1071 # This cpu is enabled by default
1072 self
.default
= default
1075 if name
in CpuModel
.dict:
1076 raise AttributeError, "CpuModel '%s' already registered" % name
1077 CpuModel
.dict[name
] = self
1081 # Sticky variables get saved in the variables file so they persist from
1082 # one invocation to the next (unless overridden, in which case the new
1083 # value becomes sticky).
1084 sticky_vars
= Variables(args
=ARGUMENTS
)
1085 Export('sticky_vars')
1087 # Sticky variables that should be exported
1089 Export('export_vars')
1093 Export('all_protocols')
1095 Export('protocol_dirs')
1097 Export('slicc_includes')
1099 # Walk the tree and execute all SConsopts scripts that wil add to the
1101 if GetOption('verbose'):
1102 print "Reading SConsopts"
1103 for bdir
in [ base_dir
] + extras_dir_list
:
1105 print "Error: directory '%s' does not exist" % bdir
1107 for root
, dirs
, files
in os
.walk(bdir
):
1108 if 'SConsopts' in files
:
1109 if GetOption('verbose'):
1110 print "Reading", joinpath(root
, 'SConsopts')
1111 SConscript(joinpath(root
, 'SConsopts'))
1115 sticky_vars
.AddVariables(
1116 EnumVariable('TARGET_ISA', 'Target ISA', 'alpha', all_isa_list
),
1117 ListVariable('CPU_MODELS', 'CPU models',
1118 sorted(n
for n
,m
in CpuModel
.dict.iteritems() if m
.default
),
1119 sorted(CpuModel
.dict.keys())),
1120 BoolVariable('EFENCE', 'Link with Electric Fence malloc debugger',
1122 BoolVariable('SS_COMPATIBLE_FP',
1123 'Make floating-point results compatible with SimpleScalar',
1125 BoolVariable('USE_SSE2',
1126 'Compile for SSE2 (-msse2) to get IEEE FP on x86 hosts',
1128 BoolVariable('USE_POSIX_CLOCK', 'Use POSIX Clocks', have_posix_clock
),
1129 BoolVariable('USE_FENV', 'Use <fenv.h> IEEE mode control', have_fenv
),
1130 BoolVariable('CP_ANNOTATE', 'Enable critical path annotation capability', False),
1131 BoolVariable('USE_KVM', 'Enable hardware virtualized (KVM) CPU models', have_kvm
),
1132 EnumVariable('PROTOCOL', 'Coherence protocol for Ruby', 'None',
1136 # These variables get exported to #defines in config/*.hh (see src/SConscript).
1137 export_vars
+= ['USE_FENV', 'SS_COMPATIBLE_FP', 'TARGET_ISA', 'CP_ANNOTATE',
1138 'USE_POSIX_CLOCK', 'USE_KVM', 'PROTOCOL', 'HAVE_PROTOBUF',
1139 'HAVE_PERF_ATTR_EXCLUDE_HOST']
1141 ###################################################
1143 # Define a SCons builder for configuration flag headers.
1145 ###################################################
1147 # This function generates a config header file that #defines the
1148 # variable symbol to the current variable setting (0 or 1). The source
1149 # operands are the name of the variable and a Value node containing the
1150 # value of the variable.
1151 def build_config_file(target
, source
, env
):
1152 (variable
, value
) = [s
.get_contents() for s
in source
]
1153 f
= file(str(target
[0]), 'w')
1154 print >> f
, '#define', variable
, value
1158 # Combine the two functions into a scons Action object.
1159 config_action
= MakeAction(build_config_file
, Transform("CONFIG H", 2))
1161 # The emitter munges the source & target node lists to reflect what
1162 # we're really doing.
1163 def config_emitter(target
, source
, env
):
1164 # extract variable name from Builder arg
1165 variable
= str(target
[0])
1166 # True target is config header file
1167 target
= joinpath('config', variable
.lower() + '.hh')
1169 if isinstance(val
, bool):
1170 # Force value to 0/1
1172 elif isinstance(val
, str):
1173 val
= '"' + val
+ '"'
1175 # Sources are variable name & value (packaged in SCons Value nodes)
1176 return ([target
], [Value(variable
), Value(val
)])
1178 config_builder
= Builder(emitter
= config_emitter
, action
= config_action
)
1180 main
.Append(BUILDERS
= { 'ConfigFile' : config_builder
})
1182 # libelf build is shared across all configs in the build root.
1183 main
.SConscript('ext/libelf/SConscript',
1184 variant_dir
= joinpath(build_root
, 'libelf'))
1186 # gzstream build is shared across all configs in the build root.
1187 main
.SConscript('ext/gzstream/SConscript',
1188 variant_dir
= joinpath(build_root
, 'gzstream'))
1190 # libfdt build is shared across all configs in the build root.
1191 main
.SConscript('ext/libfdt/SConscript',
1192 variant_dir
= joinpath(build_root
, 'libfdt'))
1194 # fputils build is shared across all configs in the build root.
1195 main
.SConscript('ext/fputils/SConscript',
1196 variant_dir
= joinpath(build_root
, 'fputils'))
1198 # DRAMSim2 build is shared across all configs in the build root.
1199 main
.SConscript('ext/dramsim2/SConscript',
1200 variant_dir
= joinpath(build_root
, 'dramsim2'))
1202 # DRAMPower build is shared across all configs in the build root.
1203 main
.SConscript('ext/drampower/SConscript',
1204 variant_dir
= joinpath(build_root
, 'drampower'))
1206 # nomali build is shared across all configs in the build root.
1207 main
.SConscript('ext/nomali/SConscript',
1208 variant_dir
= joinpath(build_root
, 'nomali'))
1210 ###################################################
1212 # This function is used to set up a directory with switching headers
1214 ###################################################
1216 main
['ALL_ISA_LIST'] = all_isa_list
1218 def make_switching_dir(dname
, switch_headers
, env
):
1219 # Generate the header. target[0] is the full path of the output
1220 # header to generate. 'source' is a dummy variable, since we get the
1221 # list of ISAs from env['ALL_ISA_LIST'].
1222 def gen_switch_hdr(target
, source
, env
):
1223 fname
= str(target
[0])
1224 isa
= env
['TARGET_ISA'].lower()
1226 f
= open(fname
, 'w')
1227 print >>f
, '#include "%s/%s/%s"' % (dname
, isa
, basename(fname
))
1230 print "Failed to create %s" % fname
1233 # Build SCons Action object. 'varlist' specifies env vars that this
1234 # action depends on; when env['ALL_ISA_LIST'] changes these actions
1235 # should get re-executed.
1236 switch_hdr_action
= MakeAction(gen_switch_hdr
,
1237 Transform("GENERATE"), varlist
=['ALL_ISA_LIST'])
1239 # Instantiate actions for each header
1240 for hdr
in switch_headers
:
1241 env
.Command(hdr
, [], switch_hdr_action
)
1243 isa_target
= Dir('.').up().name
.lower().replace('_', '-')
1244 env
['PHONY_BASE'] = '#'+isa_target
1245 all_isa_deps
[isa_target
] = None
1247 Export('make_switching_dir')
1249 # all-isas -> all-deps -> all-environs -> all_targets
1250 main
.Alias('#all-isas', [])
1251 main
.Alias('#all-deps', '#all-isas')
1253 # Dummy target to ensure all environments are created before telling
1254 # SCons what to actually make (the command line arguments). We attach
1255 # them to the dependence graph after the environments are complete.
1256 ORIG_BUILD_TARGETS
= list(BUILD_TARGETS
) # force a copy; gets closure to work.
1257 def environsComplete(target
, source
, env
):
1258 for t
in ORIG_BUILD_TARGETS
:
1259 main
.Depends('#all-targets', t
)
1261 # Each build/* switching_dir attaches its *-environs target to #all-environs.
1262 main
.Append(BUILDERS
= {'CompleteEnvirons' :
1263 Builder(action
=MakeAction(environsComplete
, None))})
1264 main
.CompleteEnvirons('#all-environs', [])
1266 def doNothing(**ignored
): pass
1267 main
.Append(BUILDERS
= {'Dummy': Builder(action
=MakeAction(doNothing
, None))})
1269 # The final target to which all the original targets ultimately get attached.
1270 main
.Dummy('#all-targets', '#all-environs')
1271 BUILD_TARGETS
[:] = ['#all-targets']
1273 ###################################################
1275 # Define build environments for selected configurations.
1277 ###################################################
1279 for variant_path
in variant_paths
:
1280 if not GetOption('silent'):
1281 print "Building in", variant_path
1283 # Make a copy of the build-root environment to use for this config.
1285 env
['BUILDDIR'] = variant_path
1287 # variant_dir is the tail component of build path, and is used to
1288 # determine the build parameters (e.g., 'ALPHA_SE')
1289 (build_root
, variant_dir
) = splitpath(variant_path
)
1291 # Set env variables according to the build directory config.
1292 sticky_vars
.files
= []
1293 # Variables for $BUILD_ROOT/$VARIANT_DIR are stored in
1294 # $BUILD_ROOT/variables/$VARIANT_DIR so you can nuke
1295 # $BUILD_ROOT/$VARIANT_DIR without losing your variables settings.
1296 current_vars_file
= joinpath(build_root
, 'variables', variant_dir
)
1297 if isfile(current_vars_file
):
1298 sticky_vars
.files
.append(current_vars_file
)
1299 if not GetOption('silent'):
1300 print "Using saved variables file %s" % current_vars_file
1302 # Build dir-specific variables file doesn't exist.
1304 # Make sure the directory is there so we can create it later
1305 opt_dir
= dirname(current_vars_file
)
1306 if not isdir(opt_dir
):
1309 # Get default build variables from source tree. Variables are
1310 # normally determined by name of $VARIANT_DIR, but can be
1311 # overridden by '--default=' arg on command line.
1312 default
= GetOption('default')
1313 opts_dir
= joinpath(main
.root
.abspath
, 'build_opts')
1315 default_vars_files
= [joinpath(build_root
, 'variables', default
),
1316 joinpath(opts_dir
, default
)]
1318 default_vars_files
= [joinpath(opts_dir
, variant_dir
)]
1319 existing_files
= filter(isfile
, default_vars_files
)
1321 default_vars_file
= existing_files
[0]
1322 sticky_vars
.files
.append(default_vars_file
)
1323 print "Variables file %s not found,\n using defaults in %s" \
1324 % (current_vars_file
, default_vars_file
)
1326 print "Error: cannot find variables file %s or " \
1327 "default file(s) %s" \
1328 % (current_vars_file
, ' or '.join(default_vars_files
))
1331 # Apply current variable settings to env
1332 sticky_vars
.Update(env
)
1334 help_texts
["local_vars"] += \
1335 "Build variables for %s:\n" % variant_dir \
1336 + sticky_vars
.GenerateHelpText(env
)
1338 # Process variable settings.
1340 if not have_fenv
and env
['USE_FENV']:
1341 print "Warning: <fenv.h> not available; " \
1342 "forcing USE_FENV to False in", variant_dir
+ "."
1343 env
['USE_FENV'] = False
1345 if not env
['USE_FENV']:
1346 print "Warning: No IEEE FP rounding mode control in", variant_dir
+ "."
1347 print " FP results may deviate slightly from other platforms."
1350 env
.Append(LIBS
=['efence'])
1354 print "Warning: Can not enable KVM, host seems to lack KVM support"
1355 env
['USE_KVM'] = False
1356 elif not is_isa_kvm_compatible(env
['TARGET_ISA']):
1357 print "Info: KVM support disabled due to unsupported host and " \
1358 "target ISA combination"
1359 env
['USE_KVM'] = False
1361 # Warn about missing optional functionality
1363 if not main
['HAVE_PERF_ATTR_EXCLUDE_HOST']:
1364 print "Warning: perf_event headers lack support for the " \
1365 "exclude_host attribute. KVM instruction counts will " \
1368 # Save sticky variable settings back to current variables file
1369 sticky_vars
.Save(current_vars_file
, env
)
1372 env
.Append(CCFLAGS
=['-msse2'])
1374 # The src/SConscript file sets up the build rules in 'env' according
1375 # to the configured variables. It returns a list of environments,
1376 # one for each variant build (debug, opt, etc.)
1377 SConscript('src/SConscript', variant_dir
= variant_path
, exports
= 'env')
1379 def pairwise(iterable
):
1380 "s -> (s0,s1), (s1,s2), (s2, s3), ..."
1381 a
, b
= itertools
.tee(iterable
)
1383 return itertools
.izip(a
, b
)
1385 # Create false dependencies so SCons will parse ISAs, establish
1386 # dependencies, and setup the build Environments serially. Either
1387 # SCons (likely) and/or our SConscripts (possibly) cannot cope with -j
1388 # greater than 1. It appears to be standard race condition stuff; it
1389 # doesn't always fail, but usually, and the behaviors are different.
1390 # Every time I tried to remove this, builds would fail in some
1391 # creative new way. So, don't do that. You'll want to, though, because
1392 # tests/SConscript takes a long time to make its Environments.
1393 for t1
, t2
in pairwise(sorted(all_isa_deps
.iterkeys())):
1394 main
.Depends('#%s-deps' % t2
, '#%s-deps' % t1
)
1395 main
.Depends('#%s-environs' % t2
, '#%s-environs' % t1
)
1399 Usage: scons [scons options] [build variables] [target(s)]
1401 Extra scons options:
1404 Global build variables: