3 # Copyright (c) 2013 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('--default', dest
='default', type='string', action
='store',
177 help='Override which build_opts file to use for defaults')
178 AddLocalOption('--ignore-style', dest
='ignore_style', action
='store_true',
179 help='Disable style checking hooks')
180 AddLocalOption('--no-lto', dest
='no_lto', action
='store_true',
181 help='Disable Link-Time Optimization for fast')
182 AddLocalOption('--update-ref', dest
='update_ref', action
='store_true',
183 help='Update test reference outputs')
184 AddLocalOption('--verbose', dest
='verbose', action
='store_true',
185 help='Print full tool command lines')
187 termcap
= get_termcap(GetOption('use_colors'))
189 ########################################################################
191 # Set up the main build environment.
193 ########################################################################
195 # export TERM so that clang reports errors in color
196 use_vars
= set([ 'AS', 'AR', 'CC', 'CXX', 'HOME', 'LD_LIBRARY_PATH',
197 'LIBRARY_PATH', 'PATH', 'PKG_CONFIG_PATH', 'PROTOC',
198 'PYTHONPATH', 'RANLIB', 'SWIG', 'TERM' ])
201 "M5", # M5 configuration (e.g., path to kernels)
202 "DISTCC_", # distcc (distributed compiler wrapper) configuration
203 "CCACHE_", # ccache (caching compiler wrapper) configuration
204 "CCC_", # clang static analyzer configuration
208 for key
,val
in os
.environ
.iteritems():
209 if key
in use_vars
or \
210 any([key
.startswith(prefix
) for prefix
in use_prefixes
]):
213 main
= Environment(ENV
=use_env
)
214 main
.Decider('MD5-timestamp')
215 main
.root
= Dir(".") # The current directory (where this file lives).
216 main
.srcdir
= Dir("src") # The source directory
218 main_dict_keys
= main
.Dictionary().keys()
220 # Check that we have a C/C++ compiler
221 if not ('CC' in main_dict_keys
and 'CXX' in main_dict_keys
):
222 print "No C++ compiler installed (package g++ on Ubuntu and RedHat)"
225 # Check that swig is present
226 if not 'SWIG' in main_dict_keys
:
227 print "swig is not installed (package swig on Ubuntu and RedHat)"
230 # add useful python code PYTHONPATH so it can be used by subprocesses
232 main
.AppendENVPath('PYTHONPATH', extra_python_paths
)
234 ########################################################################
238 # If the gem5 directory is a mercurial repository, we should do some
241 ########################################################################
243 hgdir
= main
.root
.Dir(".hg")
245 mercurial_style_message
= """
246 You're missing the gem5 style hook, which automatically checks your code
247 against the gem5 style rules on hg commit and qrefresh commands. This
248 script will now install the hook in your .hg/hgrc file.
249 Press enter to continue, or ctrl-c to abort: """
251 mercurial_style_hook
= """
252 # The following lines were automatically added by gem5/SConstruct
253 # to provide the gem5 style-checking hooks
255 style = %s/util/style.py
258 pretxncommit.style = python:style.check_style
259 pre-qrefresh.style = python:style.check_style
260 # End of SConstruct additions
262 """ % (main
.root
.abspath
)
264 mercurial_lib_not_found
= """
265 Mercurial libraries cannot be found, ignoring style hook. If
266 you are a gem5 developer, please fix this and run the style
267 hook. It is important.
270 # Check for style hook and prompt for installation if it's not there.
271 # Skip this if --ignore-style was specified, there's no .hg dir to
272 # install a hook in, or there's no interactive terminal to prompt.
273 if not GetOption('ignore_style') and hgdir
.exists() and sys
.stdin
.isatty():
276 from mercurial
import ui
278 ui
.readconfig(hgdir
.File('hgrc').abspath
)
279 style_hook
= ui
.config('hooks', 'pretxncommit.style', None) and \
280 ui
.config('hooks', 'pre-qrefresh.style', None)
282 print mercurial_lib_not_found
285 print mercurial_style_message
,
286 # continue unless user does ctrl-c/ctrl-d etc.
290 print "Input exception, exiting scons.\n"
292 hgrc_path
= '%s/.hg/hgrc' % main
.root
.abspath
293 print "Adding style hook to", hgrc_path
, "\n"
295 hgrc
= open(hgrc_path
, 'a')
296 hgrc
.write(mercurial_style_hook
)
299 print "Error updating", hgrc_path
303 ###################################################
305 # Figure out which configurations to set up based on the path(s) of
308 ###################################################
310 # Find default configuration & binary.
311 Default(environ
.get('M5_DEFAULT_BINARY', 'build/ALPHA/gem5.debug'))
313 # helper function: find last occurrence of element in list
314 def rfind(l
, elt
, offs
= -1):
315 for i
in range(len(l
)+offs
, 0, -1):
318 raise ValueError, "element not found"
320 # Take a list of paths (or SCons Nodes) and return a list with all
321 # paths made absolute and ~-expanded. Paths will be interpreted
322 # relative to the launch directory unless a different root is provided
323 def makePathListAbsolute(path_list
, root
=GetLaunchDir()):
324 return [abspath(joinpath(root
, expanduser(str(p
))))
327 # Each target must have 'build' in the interior of the path; the
328 # directory below this will determine the build parameters. For
329 # example, for target 'foo/bar/build/ALPHA_SE/arch/alpha/blah.do' we
330 # recognize that ALPHA_SE specifies the configuration because it
331 # follow 'build' in the build path.
333 # The funky assignment to "[:]" is needed to replace the list contents
334 # in place rather than reassign the symbol to a new list, which
335 # doesn't work (obviously!).
336 BUILD_TARGETS
[:] = makePathListAbsolute(BUILD_TARGETS
)
338 # Generate a list of the unique build roots and configs that the
339 # collected targets reference.
342 for t
in BUILD_TARGETS
:
343 path_dirs
= t
.split('/')
345 build_top
= rfind(path_dirs
, 'build', -2)
347 print "Error: no non-leaf 'build' dir found on target path", t
349 this_build_root
= joinpath('/',*path_dirs
[:build_top
+1])
351 build_root
= this_build_root
353 if this_build_root
!= build_root
:
354 print "Error: build targets not under same build root\n"\
355 " %s\n %s" % (build_root
, this_build_root
)
357 variant_path
= joinpath('/',*path_dirs
[:build_top
+2])
358 if variant_path
not in variant_paths
:
359 variant_paths
.append(variant_path
)
361 # Make sure build_root exists (might not if this is the first build there)
362 if not isdir(build_root
):
364 main
['BUILDROOT'] = build_root
368 main
.SConsignFile(joinpath(build_root
, "sconsign"))
370 # Default duplicate option is to use hard links, but this messes up
371 # when you use emacs to edit a file in the target dir, as emacs moves
372 # file to file~ then copies to file, breaking the link. Symbolic
373 # (soft) links work better.
374 main
.SetOption('duplicate', 'soft-copy')
377 # Set up global sticky variables... these are common to an entire build
378 # tree (not specific to a particular build like ALPHA_SE)
381 global_vars_file
= joinpath(build_root
, 'variables.global')
383 global_vars
= Variables(global_vars_file
, args
=ARGUMENTS
)
385 global_vars
.AddVariables(
386 ('CC', 'C compiler', environ
.get('CC', main
['CC'])),
387 ('CXX', 'C++ compiler', environ
.get('CXX', main
['CXX'])),
388 ('SWIG', 'SWIG tool', environ
.get('SWIG', main
['SWIG'])),
389 ('PROTOC', 'protoc tool', environ
.get('PROTOC', 'protoc')),
390 ('BATCH', 'Use batch pool for build and tests', False),
391 ('BATCH_CMD', 'Batch pool submission command name', 'qdo'),
392 ('M5_BUILD_CACHE', 'Cache built objects in this directory', False),
393 ('EXTRAS', 'Add extra directories to the compilation', '')
396 # Update main environment with values from ARGUMENTS & global_vars_file
397 global_vars
.Update(main
)
398 help_texts
["global_vars"] += global_vars
.GenerateHelpText(main
)
400 # Save sticky variable settings back to current variables file
401 global_vars
.Save(global_vars_file
, main
)
403 # Parse EXTRAS variable to build list of all directories where we're
404 # look for sources etc. This list is exported as extras_dir_list.
405 base_dir
= main
.srcdir
.abspath
407 extras_dir_list
= makePathListAbsolute(main
['EXTRAS'].split(':'))
412 Export('extras_dir_list')
414 # the ext directory should be on the #includes path
415 main
.Append(CPPPATH
=[Dir('ext')])
417 def strip_build_path(path
, env
):
419 variant_base
= env
['BUILDROOT'] + os
.path
.sep
420 if path
.startswith(variant_base
):
421 path
= path
[len(variant_base
):]
422 elif path
.startswith('build/'):
426 # Generate a string of the form:
427 # common/path/prefix/src1, src2 -> tgt1, tgt2
428 # to print while building.
429 class Transform(object):
430 # all specific color settings should be here and nowhere else
431 tool_color
= termcap
.Normal
432 pfx_color
= termcap
.Yellow
433 srcs_color
= termcap
.Yellow
+ termcap
.Bold
434 arrow_color
= termcap
.Blue
+ termcap
.Bold
435 tgts_color
= termcap
.Yellow
+ termcap
.Bold
437 def __init__(self
, tool
, max_sources
=99):
438 self
.format
= self
.tool_color
+ (" [%8s] " % tool
) \
439 + self
.pfx_color
+ "%s" \
440 + self
.srcs_color
+ "%s" \
441 + self
.arrow_color
+ " -> " \
442 + self
.tgts_color
+ "%s" \
444 self
.max_sources
= max_sources
446 def __call__(self
, target
, source
, env
, for_signature
=None):
447 # truncate source list according to max_sources param
448 source
= source
[0:self
.max_sources
]
450 return strip_build_path(str(f
), env
)
452 srcs
= map(strip
, source
)
455 tgts
= map(strip
, target
)
456 # surprisingly, os.path.commonprefix is a dumb char-by-char string
457 # operation that has nothing to do with paths.
458 com_pfx
= os
.path
.commonprefix(srcs
+ tgts
)
459 com_pfx_len
= len(com_pfx
)
461 # do some cleanup and sanity checking on common prefix
462 if com_pfx
[-1] == ".":
463 # prefix matches all but file extension: ok
464 # back up one to change 'foo.cc -> o' to 'foo.cc -> .o'
465 com_pfx
= com_pfx
[0:-1]
466 elif com_pfx
[-1] == "/":
467 # common prefix is directory path: OK
470 src0_len
= len(srcs
[0])
471 tgt0_len
= len(tgts
[0])
472 if src0_len
== com_pfx_len
:
473 # source is a substring of target, OK
475 elif tgt0_len
== com_pfx_len
:
476 # target is a substring of source, need to back up to
477 # avoid empty string on RHS of arrow
478 sep_idx
= com_pfx
.rfind(".")
480 com_pfx
= com_pfx
[0:sep_idx
]
483 elif src0_len
> com_pfx_len
and srcs
[0][com_pfx_len
] == ".":
484 # still splitting at file extension: ok
487 # probably a fluke; ignore it
489 # recalculate length in case com_pfx was modified
490 com_pfx_len
= len(com_pfx
)
492 f
= map(lambda s
: s
[com_pfx_len
:], files
)
494 return self
.format
% (com_pfx
, fmt(srcs
), fmt(tgts
))
498 # enable the regression script to use the termcap
499 main
['TERMCAP'] = termcap
501 if GetOption('verbose'):
502 def MakeAction(action
, string
, *args
, **kwargs
):
503 return Action(action
, *args
, **kwargs
)
506 main
['CCCOMSTR'] = Transform("CC")
507 main
['CXXCOMSTR'] = Transform("CXX")
508 main
['ASCOMSTR'] = Transform("AS")
509 main
['SWIGCOMSTR'] = Transform("SWIG")
510 main
['ARCOMSTR'] = Transform("AR", 0)
511 main
['LINKCOMSTR'] = Transform("LINK", 0)
512 main
['RANLIBCOMSTR'] = Transform("RANLIB", 0)
513 main
['M4COMSTR'] = Transform("M4")
514 main
['SHCCCOMSTR'] = Transform("SHCC")
515 main
['SHCXXCOMSTR'] = Transform("SHCXX")
518 # Initialize the Link-Time Optimization (LTO) flags
519 main
['LTO_CCFLAGS'] = []
520 main
['LTO_LDFLAGS'] = []
522 # According to the readme, tcmalloc works best if the compiler doesn't
523 # assume that we're using the builtin malloc and friends. These flags
524 # are compiler-specific, so we need to set them after we detect which
525 # compiler we're using.
526 main
['TCMALLOC_CCFLAGS'] = []
528 CXX_version
= readCommand([main
['CXX'],'--version'], exception
=False)
529 CXX_V
= readCommand([main
['CXX'],'-V'], exception
=False)
531 main
['GCC'] = CXX_version
and CXX_version
.find('g++') >= 0
532 main
['CLANG'] = CXX_version
and CXX_version
.find('clang') >= 0
533 if main
['GCC'] + main
['CLANG'] > 1:
534 print 'Error: How can we have two at the same time?'
537 # Set up default C++ compiler flags
538 if main
['GCC'] or main
['CLANG']:
539 # As gcc and clang share many flags, do the common parts here
540 main
.Append(CCFLAGS
=['-pipe'])
541 main
.Append(CCFLAGS
=['-fno-strict-aliasing'])
542 # Enable -Wall and then disable the few warnings that we
543 # consistently violate
544 main
.Append(CCFLAGS
=['-Wall', '-Wno-sign-compare', '-Wundef'])
545 # We always compile using C++11, but only gcc >= 4.7 and clang 3.1
546 # actually use that name, so we stick with c++0x
547 main
.Append(CXXFLAGS
=['-std=c++0x'])
548 # Add selected sanity checks from -Wextra
549 main
.Append(CXXFLAGS
=['-Wmissing-field-initializers',
550 '-Woverloaded-virtual'])
552 print termcap
.Yellow
+ termcap
.Bold
+ 'Error' + termcap
.Normal
,
553 print "Don't know what compiler options to use for your compiler."
554 print termcap
.Yellow
+ ' compiler:' + termcap
.Normal
, main
['CXX']
555 print termcap
.Yellow
+ ' version:' + termcap
.Normal
,
557 print termcap
.Yellow
+ termcap
.Bold
+ "COMMAND NOT FOUND!" +\
560 print CXX_version
.replace('\n', '<nl>')
561 print " If you're trying to use a compiler other than GCC"
562 print " or clang, there appears to be something wrong with your"
563 print " environment."
565 print " If you are trying to use a compiler other than those listed"
566 print " above you will need to ease fix SConstruct and "
567 print " src/SConscript to support that compiler."
571 # Check for a supported version of gcc. >= 4.6 is chosen for its
572 # level of c++11 support. See
573 # http://gcc.gnu.org/projects/cxx0x.html for details. 4.6 is also
574 # the first version with proper LTO support.
575 gcc_version
= readCommand([main
['CXX'], '-dumpversion'], exception
=False)
576 if compareVersions(gcc_version
, "4.6") < 0:
577 print 'Error: gcc version 4.6 or newer required.'
578 print ' Installed version:', gcc_version
581 main
['GCC_VERSION'] = gcc_version
583 # gcc from version 4.8 and above generates "rep; ret" instructions
584 # to avoid performance penalties on certain AMD chips. Older
585 # assemblers detect this as an error, "Error: expecting string
586 # instruction after `rep'"
587 if compareVersions(gcc_version
, "4.8") > 0:
588 as_version
= readCommand([main
['AS'], '-v', '/dev/null'],
589 exception
=False).split()
591 if not as_version
or compareVersions(as_version
[-1], "2.23") < 0:
592 print termcap
.Yellow
+ termcap
.Bold
+ \
593 'Warning: This combination of gcc and binutils have' + \
594 ' known incompatibilities.\n' + \
595 ' If you encounter build problems, please update ' + \
596 'binutils to 2.23.' + \
599 # Add the appropriate Link-Time Optimization (LTO) flags
600 # unless LTO is explicitly turned off. Note that these flags
601 # are only used by the fast target.
602 if not GetOption('no_lto'):
603 # Pass the LTO flag when compiling to produce GIMPLE
604 # output, we merely create the flags here and only append
606 main
['LTO_CCFLAGS'] = ['-flto=%d' % GetOption('num_jobs')]
608 # Use the same amount of jobs for LTO as we are running
610 main
['LTO_LDFLAGS'] = ['-flto=%d' % GetOption('num_jobs')]
612 main
.Append(TCMALLOC_CCFLAGS
=['-fno-builtin-malloc', '-fno-builtin-calloc',
613 '-fno-builtin-realloc', '-fno-builtin-free'])
616 # Check for a supported version of clang, >= 3.0 is needed to
617 # support similar features as gcc 4.6. See
618 # http://clang.llvm.org/cxx_status.html for details
619 clang_version_re
= re
.compile(".* version (\d+\.\d+)")
620 clang_version_match
= clang_version_re
.search(CXX_version
)
621 if (clang_version_match
):
622 clang_version
= clang_version_match
.groups()[0]
623 if compareVersions(clang_version
, "3.0") < 0:
624 print 'Error: clang version 3.0 or newer required.'
625 print ' Installed version:', clang_version
628 print 'Error: Unable to determine clang version.'
631 # clang has a few additional warnings that we disable,
632 # tautological comparisons are allowed due to unsigned integers
633 # being compared to constants that happen to be 0, and extraneous
634 # parantheses are allowed due to Ruby's printing of the AST,
635 # finally self assignments are allowed as the generated CPU code
637 main
.Append(CCFLAGS
=['-Wno-tautological-compare',
640 # Some versions of libstdc++ (4.8?) seem to
641 # use struct hash and class hash
643 '-Wno-mismatched-tags',
646 main
.Append(TCMALLOC_CCFLAGS
=['-fno-builtin'])
648 # On Mac OS X/Darwin we need to also use libc++ (part of XCode) as
649 # opposed to libstdc++, as the later is dated.
650 if sys
.platform
== "darwin":
651 main
.Append(CXXFLAGS
=['-stdlib=libc++'])
652 main
.Append(LIBS
=['c++'])
655 print termcap
.Yellow
+ termcap
.Bold
+ 'Error' + termcap
.Normal
,
656 print "Don't know what compiler options to use for your compiler."
657 print termcap
.Yellow
+ ' compiler:' + termcap
.Normal
, main
['CXX']
658 print termcap
.Yellow
+ ' version:' + termcap
.Normal
,
660 print termcap
.Yellow
+ termcap
.Bold
+ "COMMAND NOT FOUND!" +\
663 print CXX_version
.replace('\n', '<nl>')
664 print " If you're trying to use a compiler other than GCC"
665 print " or clang, there appears to be something wrong with your"
666 print " environment."
668 print " If you are trying to use a compiler other than those listed"
669 print " above you will need to ease fix SConstruct and "
670 print " src/SConscript to support that compiler."
673 # Set up common yacc/bison flags (needed for Ruby)
674 main
['YACCFLAGS'] = '-d'
675 main
['YACCHXXFILESUFFIX'] = '.hh'
677 # Do this after we save setting back, or else we'll tack on an
678 # extra 'qdo' every time we run scons.
680 main
['CC'] = main
['BATCH_CMD'] + ' ' + main
['CC']
681 main
['CXX'] = main
['BATCH_CMD'] + ' ' + main
['CXX']
682 main
['AS'] = main
['BATCH_CMD'] + ' ' + main
['AS']
683 main
['AR'] = main
['BATCH_CMD'] + ' ' + main
['AR']
684 main
['RANLIB'] = main
['BATCH_CMD'] + ' ' + main
['RANLIB']
686 if sys
.platform
== 'cygwin':
687 # cygwin has some header file issues...
688 main
.Append(CCFLAGS
=["-Wno-uninitialized"])
690 # Check for the protobuf compiler
691 protoc_version
= readCommand([main
['PROTOC'], '--version'],
692 exception
='').split()
694 # First two words should be "libprotoc x.y.z"
695 if len(protoc_version
) < 2 or protoc_version
[0] != 'libprotoc':
696 print termcap
.Yellow
+ termcap
.Bold
+ \
697 'Warning: Protocol buffer compiler (protoc) not found.\n' + \
698 ' Please install protobuf-compiler for tracing support.' + \
700 main
['PROTOC'] = False
702 # Based on the availability of the compress stream wrappers,
704 min_protoc_version
= '2.1.0'
705 if compareVersions(protoc_version
[1], min_protoc_version
) < 0:
706 print termcap
.Yellow
+ termcap
.Bold
+ \
707 'Warning: protoc version', min_protoc_version
, \
708 'or newer required.\n' + \
709 ' Installed version:', protoc_version
[1], \
711 main
['PROTOC'] = False
713 # Attempt to determine the appropriate include path and
714 # library path using pkg-config, that means we also need to
715 # check for pkg-config. Note that it is possible to use
716 # protobuf without the involvement of pkg-config. Later on we
717 # check go a library config check and at that point the test
718 # will fail if libprotobuf cannot be found.
719 if readCommand(['pkg-config', '--version'], exception
=''):
721 # Attempt to establish what linking flags to add for protobuf
723 main
.ParseConfig('pkg-config --cflags --libs-only-L protobuf')
725 print termcap
.Yellow
+ termcap
.Bold
+ \
726 'Warning: pkg-config could not get protobuf flags.' + \
730 if not main
.has_key('SWIG'):
731 print 'Error: SWIG utility not found.'
732 print ' Please install (see http://www.swig.org) and retry.'
735 # Check for appropriate SWIG version
736 swig_version
= readCommand([main
['SWIG'], '-version'], exception
='').split()
737 # First 3 words should be "SWIG Version x.y.z"
738 if len(swig_version
) < 3 or \
739 swig_version
[0] != 'SWIG' or swig_version
[1] != 'Version':
740 print 'Error determining SWIG version.'
743 min_swig_version
= '2.0.4'
744 if compareVersions(swig_version
[2], min_swig_version
) < 0:
745 print 'Error: SWIG version', min_swig_version
, 'or newer required.'
746 print ' Installed version:', swig_version
[2]
749 # Check for known incompatibilities. The standard library shipped with
750 # gcc >= 4.9 does not play well with swig versions prior to 3.0
751 if main
['GCC'] and compareVersions(gcc_version
, '4.9') >= 0 and \
752 compareVersions(swig_version
[2], '3.0') < 0:
753 print termcap
.Yellow
+ termcap
.Bold
+ \
754 'Warning: This combination of gcc and swig have' + \
755 ' known incompatibilities.\n' + \
756 ' If you encounter build problems, please update ' + \
757 'swig to 3.0 or later.' + \
760 # Set up SWIG flags & scanner
761 swig_flags
=Split('-c++ -python -modern -templatereduce $_CPPINCFLAGS')
762 main
.Append(SWIGFLAGS
=swig_flags
)
764 # Check for 'timeout' from GNU coreutils. If present, regressions
765 # will be run with a time limit.
766 TIMEOUT_version
= readCommand(['timeout', '--version'], exception
=False)
767 main
['TIMEOUT'] = TIMEOUT_version
and TIMEOUT_version
.find('timeout') == 0
769 # filter out all existing swig scanners, they mess up the dependency
770 # stuff for some reason
772 for scanner
in main
['SCANNERS']:
773 skeys
= scanner
.skeys
777 if isinstance(skeys
, (list, tuple)) and '.i' in skeys
:
780 scanners
.append(scanner
)
782 # add the new swig scanner that we like better
783 from SCons
.Scanner
import ClassicCPP
as CPPScanner
784 swig_inc_re
= '^[ \t]*[%,#][ \t]*(?:include|import)[ \t]*(<|")([^>"]+)(>|")'
785 scanners
.append(CPPScanner("SwigScan", [ ".i" ], "CPPPATH", swig_inc_re
))
787 # replace the scanners list that has what we want
788 main
['SCANNERS'] = scanners
790 # Add a custom Check function to the Configure context so that we can
791 # figure out if the compiler adds leading underscores to global
792 # variables. This is needed for the autogenerated asm files that we
793 # use for embedding the python code.
794 def CheckLeading(context
):
795 context
.Message("Checking for leading underscore in global variables...")
796 # 1) Define a global variable called x from asm so the C compiler
797 # won't change the symbol at all.
798 # 2) Declare that variable.
799 # 3) Use the variable
801 # If the compiler prepends an underscore, this will successfully
802 # link because the external symbol 'x' will be called '_x' which
803 # was defined by the asm statement. If the compiler does not
804 # prepend an underscore, this will not successfully link because
805 # '_x' will have been defined by assembly, while the C portion of
806 # the code will be trying to use 'x'
807 ret
= context
.TryLink('''
808 asm(".globl _x; _x: .byte 0");
810 int main() { return x; }
812 context
.env
.Append(LEADING_UNDERSCORE
=ret
)
816 # Add a custom Check function to test for structure members.
817 def CheckMember(context
, include
, decl
, member
, include_quotes
="<>"):
818 context
.Message("Checking for member %s in %s..." %
824 (void)test.%(member)s;
827 """ % { "header" : include_quotes
[0] + include
+ include_quotes
[1],
832 ret
= context
.TryCompile(text
, extension
=".cc")
836 # Platform-specific configuration. Note again that we assume that all
837 # builds under a given build root run on the same host platform.
838 conf
= Configure(main
,
839 conf_dir
= joinpath(build_root
, '.scons_config'),
840 log_file
= joinpath(build_root
, 'scons_config.log'),
842 'CheckLeading' : CheckLeading
,
843 'CheckMember' : CheckMember
,
846 # Check for leading underscores. Don't really need to worry either
847 # way so don't need to check the return code.
850 # Check if we should compile a 64 bit binary on Mac OS X/Darwin
853 uname
= platform
.uname()
854 if uname
[0] == 'Darwin' and compareVersions(uname
[2], '9.0.0') >= 0:
855 if int(readCommand('sysctl -n hw.cpu64bit_capable')[0]):
856 main
.Append(CCFLAGS
=['-arch', 'x86_64'])
857 main
.Append(CFLAGS
=['-arch', 'x86_64'])
858 main
.Append(LINKFLAGS
=['-arch', 'x86_64'])
859 main
.Append(ASFLAGS
=['-arch', 'x86_64'])
863 # Recent versions of scons substitute a "Null" object for Configure()
864 # when configuration isn't necessary, e.g., if the "--help" option is
865 # present. Unfortuantely this Null object always returns false,
866 # breaking all our configuration checks. We replace it with our own
867 # more optimistic null object that returns True instead.
869 def NullCheck(*args
, **kwargs
):
873 def __init__(self
, env
):
877 def __getattr__(self
, mname
):
880 conf
= NullConf(main
)
882 # Cache build files in the supplied directory.
883 if main
['M5_BUILD_CACHE']:
884 print 'Using build cache located at', main
['M5_BUILD_CACHE']
885 CacheDir(main
['M5_BUILD_CACHE'])
887 # Find Python include and library directories for embedding the
888 # interpreter. We rely on python-config to resolve the appropriate
889 # includes and linker flags. ParseConfig does not seem to understand
890 # the more exotic linker flags such as -Xlinker and -export-dynamic so
891 # we add them explicitly below. If you want to link in an alternate
892 # version of python, see above for instructions on how to invoke
893 # scons with the appropriate PATH set.
895 # First we check if python2-config exists, else we use python-config
896 python_config
= readCommand(['which', 'python2-config'], exception
='').strip()
897 if not os
.path
.exists(python_config
):
898 python_config
= readCommand(['which', 'python-config'],
899 exception
='').strip()
900 py_includes
= readCommand([python_config
, '--includes'],
901 exception
='').split()
902 # Strip the -I from the include folders before adding them to the
904 main
.Append(CPPPATH
=map(lambda inc
: inc
[2:], py_includes
))
906 # Read the linker flags and split them into libraries and other link
907 # flags. The libraries are added later through the call the CheckLib.
908 py_ld_flags
= readCommand([python_config
, '--ldflags'], exception
='').split()
910 for lib
in py_ld_flags
:
911 if not lib
.startswith('-l'):
912 main
.Append(LINKFLAGS
=[lib
])
915 if lib
not in py_libs
:
918 # verify that this stuff works
919 if not conf
.CheckHeader('Python.h', '<>'):
920 print "Error: can't find Python.h header in", py_includes
921 print "Install Python headers (package python-dev on Ubuntu and RedHat)"
925 if not conf
.CheckLib(lib
):
926 print "Error: can't find library %s required by python" % lib
929 # On Solaris you need to use libsocket for socket ops
930 if not conf
.CheckLibWithHeader(None, 'sys/socket.h', 'C++', 'accept(0,0,0);'):
931 if not conf
.CheckLibWithHeader('socket', 'sys/socket.h', 'C++', 'accept(0,0,0);'):
932 print "Can't find library with socket calls (e.g. accept())"
935 # Check for zlib. If the check passes, libz will be automatically
936 # added to the LIBS environment variable.
937 if not conf
.CheckLibWithHeader('z', 'zlib.h', 'C++','zlibVersion();'):
938 print 'Error: did not find needed zlib compression library '\
939 'and/or zlib.h header file.'
940 print ' Please install zlib and try again.'
943 # If we have the protobuf compiler, also make sure we have the
944 # development libraries. If the check passes, libprotobuf will be
945 # automatically added to the LIBS environment variable. After
946 # this, we can use the HAVE_PROTOBUF flag to determine if we have
947 # got both protoc and libprotobuf available.
948 main
['HAVE_PROTOBUF'] = main
['PROTOC'] and \
949 conf
.CheckLibWithHeader('protobuf', 'google/protobuf/message.h',
950 'C++', 'GOOGLE_PROTOBUF_VERIFY_VERSION;')
952 # If we have the compiler but not the library, print another warning.
953 if main
['PROTOC'] and not main
['HAVE_PROTOBUF']:
954 print termcap
.Yellow
+ termcap
.Bold
+ \
955 'Warning: did not find protocol buffer library and/or headers.\n' + \
956 ' Please install libprotobuf-dev for tracing support.' + \
961 conf
.CheckLibWithHeader(None, 'time.h', 'C',
962 'clock_nanosleep(0,0,NULL,NULL);') or \
963 conf
.CheckLibWithHeader('rt', 'time.h', 'C',
964 'clock_nanosleep(0,0,NULL,NULL);')
966 have_posix_timers
= \
967 conf
.CheckLibWithHeader([None, 'rt'], [ 'time.h', 'signal.h' ], 'C',
968 'timer_create(CLOCK_MONOTONIC, NULL, NULL);')
970 if conf
.CheckLib('tcmalloc'):
971 main
.Append(CCFLAGS
=main
['TCMALLOC_CCFLAGS'])
972 elif conf
.CheckLib('tcmalloc_minimal'):
973 main
.Append(CCFLAGS
=main
['TCMALLOC_CCFLAGS'])
975 print termcap
.Yellow
+ termcap
.Bold
+ \
976 "You can get a 12% performance improvement by installing tcmalloc "\
977 "(libgoogle-perftools-dev package on Ubuntu or RedHat)." + \
980 if not have_posix_clock
:
981 print "Can't find library for POSIX clocks."
983 # Check for <fenv.h> (C99 FP environment control)
984 have_fenv
= conf
.CheckHeader('fenv.h', '<>')
986 print "Warning: Header file <fenv.h> not found."
987 print " This host has no IEEE FP rounding mode control."
989 # Check if we should enable KVM-based hardware virtualization. The API
990 # we rely on exists since version 2.6.36 of the kernel, but somehow
991 # the KVM_API_VERSION does not reflect the change. We test for one of
992 # the types as a fall back.
993 have_kvm
= conf
.CheckHeader('linux/kvm.h', '<>') and \
994 conf
.CheckTypeSize('struct kvm_xsave', '#include <linux/kvm.h>') != 0
996 print "Info: Compatible header file <linux/kvm.h> not found, " \
997 "disabling KVM support."
999 # Check if the requested target ISA is compatible with the host
1000 def is_isa_kvm_compatible(isa
):
1002 "arm" : ( "armv7l" ),
1003 "x86" : ( "x86_64" ),
1007 host_isa
= platform
.machine()
1009 print "Warning: Failed to determine host ISA."
1012 return host_isa
in isa_comp_table
.get(isa
, [])
1015 # Check if the exclude_host attribute is available. We want this to
1016 # get accurate instruction counts in KVM.
1017 main
['HAVE_PERF_ATTR_EXCLUDE_HOST'] = conf
.CheckMember(
1018 'linux/perf_event.h', 'struct perf_event_attr', 'exclude_host')
1021 ######################################################################
1023 # Finish the configuration
1025 main
= conf
.Finish()
1027 ######################################################################
1029 # Collect all non-global variables
1032 # Define the universe of supported ISAs
1034 Export('all_isa_list')
1036 class CpuModel(object):
1037 '''The CpuModel class encapsulates everything the ISA parser needs to
1038 know about a particular CPU model.'''
1040 # Dict of available CPU model objects. Accessible as CpuModel.dict.
1043 # Constructor. Automatically adds models to CpuModel.dict.
1044 def __init__(self
, name
, default
=False):
1045 self
.name
= name
# name of model
1047 # This cpu is enabled by default
1048 self
.default
= default
1051 if name
in CpuModel
.dict:
1052 raise AttributeError, "CpuModel '%s' already registered" % name
1053 CpuModel
.dict[name
] = self
1057 # Sticky variables get saved in the variables file so they persist from
1058 # one invocation to the next (unless overridden, in which case the new
1059 # value becomes sticky).
1060 sticky_vars
= Variables(args
=ARGUMENTS
)
1061 Export('sticky_vars')
1063 # Sticky variables that should be exported
1065 Export('export_vars')
1069 Export('all_protocols')
1071 Export('protocol_dirs')
1073 Export('slicc_includes')
1075 # Walk the tree and execute all SConsopts scripts that wil add to the
1077 if GetOption('verbose'):
1078 print "Reading SConsopts"
1079 for bdir
in [ base_dir
] + extras_dir_list
:
1081 print "Error: directory '%s' does not exist" % bdir
1083 for root
, dirs
, files
in os
.walk(bdir
):
1084 if 'SConsopts' in files
:
1085 if GetOption('verbose'):
1086 print "Reading", joinpath(root
, 'SConsopts')
1087 SConscript(joinpath(root
, 'SConsopts'))
1091 sticky_vars
.AddVariables(
1092 EnumVariable('TARGET_ISA', 'Target ISA', 'alpha', all_isa_list
),
1093 ListVariable('CPU_MODELS', 'CPU models',
1094 sorted(n
for n
,m
in CpuModel
.dict.iteritems() if m
.default
),
1095 sorted(CpuModel
.dict.keys())),
1096 BoolVariable('EFENCE', 'Link with Electric Fence malloc debugger',
1098 BoolVariable('SS_COMPATIBLE_FP',
1099 'Make floating-point results compatible with SimpleScalar',
1101 BoolVariable('USE_SSE2',
1102 'Compile for SSE2 (-msse2) to get IEEE FP on x86 hosts',
1104 BoolVariable('USE_POSIX_CLOCK', 'Use POSIX Clocks', have_posix_clock
),
1105 BoolVariable('USE_FENV', 'Use <fenv.h> IEEE mode control', have_fenv
),
1106 BoolVariable('CP_ANNOTATE', 'Enable critical path annotation capability', False),
1107 BoolVariable('USE_KVM', 'Enable hardware virtualized (KVM) CPU models', have_kvm
),
1108 EnumVariable('PROTOCOL', 'Coherence protocol for Ruby', 'None',
1112 # These variables get exported to #defines in config/*.hh (see src/SConscript).
1113 export_vars
+= ['USE_FENV', 'SS_COMPATIBLE_FP', 'TARGET_ISA', 'CP_ANNOTATE',
1114 'USE_POSIX_CLOCK', 'PROTOCOL', 'HAVE_PROTOBUF',
1115 'HAVE_PERF_ATTR_EXCLUDE_HOST']
1117 ###################################################
1119 # Define a SCons builder for configuration flag headers.
1121 ###################################################
1123 # This function generates a config header file that #defines the
1124 # variable symbol to the current variable setting (0 or 1). The source
1125 # operands are the name of the variable and a Value node containing the
1126 # value of the variable.
1127 def build_config_file(target
, source
, env
):
1128 (variable
, value
) = [s
.get_contents() for s
in source
]
1129 f
= file(str(target
[0]), 'w')
1130 print >> f
, '#define', variable
, value
1134 # Combine the two functions into a scons Action object.
1135 config_action
= MakeAction(build_config_file
, Transform("CONFIG H", 2))
1137 # The emitter munges the source & target node lists to reflect what
1138 # we're really doing.
1139 def config_emitter(target
, source
, env
):
1140 # extract variable name from Builder arg
1141 variable
= str(target
[0])
1142 # True target is config header file
1143 target
= joinpath('config', variable
.lower() + '.hh')
1145 if isinstance(val
, bool):
1146 # Force value to 0/1
1148 elif isinstance(val
, str):
1149 val
= '"' + val
+ '"'
1151 # Sources are variable name & value (packaged in SCons Value nodes)
1152 return ([target
], [Value(variable
), Value(val
)])
1154 config_builder
= Builder(emitter
= config_emitter
, action
= config_action
)
1156 main
.Append(BUILDERS
= { 'ConfigFile' : config_builder
})
1158 # libelf build is shared across all configs in the build root.
1159 main
.SConscript('ext/libelf/SConscript',
1160 variant_dir
= joinpath(build_root
, 'libelf'))
1162 # gzstream build is shared across all configs in the build root.
1163 main
.SConscript('ext/gzstream/SConscript',
1164 variant_dir
= joinpath(build_root
, 'gzstream'))
1166 # libfdt build is shared across all configs in the build root.
1167 main
.SConscript('ext/libfdt/SConscript',
1168 variant_dir
= joinpath(build_root
, 'libfdt'))
1170 # fputils build is shared across all configs in the build root.
1171 main
.SConscript('ext/fputils/SConscript',
1172 variant_dir
= joinpath(build_root
, 'fputils'))
1174 # DRAMSim2 build is shared across all configs in the build root.
1175 main
.SConscript('ext/dramsim2/SConscript',
1176 variant_dir
= joinpath(build_root
, 'dramsim2'))
1178 ###################################################
1180 # This function is used to set up a directory with switching headers
1182 ###################################################
1184 main
['ALL_ISA_LIST'] = all_isa_list
1186 def make_switching_dir(dname
, switch_headers
, env
):
1187 # Generate the header. target[0] is the full path of the output
1188 # header to generate. 'source' is a dummy variable, since we get the
1189 # list of ISAs from env['ALL_ISA_LIST'].
1190 def gen_switch_hdr(target
, source
, env
):
1191 fname
= str(target
[0])
1192 isa
= env
['TARGET_ISA'].lower()
1194 f
= open(fname
, 'w')
1195 print >>f
, '#include "%s/%s/%s"' % (dname
, isa
, basename(fname
))
1198 print "Failed to create %s" % fname
1201 # Build SCons Action object. 'varlist' specifies env vars that this
1202 # action depends on; when env['ALL_ISA_LIST'] changes these actions
1203 # should get re-executed.
1204 switch_hdr_action
= MakeAction(gen_switch_hdr
,
1205 Transform("GENERATE"), varlist
=['ALL_ISA_LIST'])
1207 # Instantiate actions for each header
1208 for hdr
in switch_headers
:
1209 env
.Command(hdr
, [], switch_hdr_action
)
1211 isa_target
= Dir('.').up().name
.lower().replace('_', '-')
1212 env
['PHONY_BASE'] = '#'+isa_target
1213 all_isa_deps
[isa_target
] = None
1215 Export('make_switching_dir')
1217 # all-isas -> all-deps -> all-environs -> all_targets
1218 main
.Alias('#all-isas', [])
1219 main
.Alias('#all-deps', '#all-isas')
1221 # Dummy target to ensure all environments are created before telling
1222 # SCons what to actually make (the command line arguments). We attach
1223 # them to the dependence graph after the environments are complete.
1224 ORIG_BUILD_TARGETS
= list(BUILD_TARGETS
) # force a copy; gets closure to work.
1225 def environsComplete(target
, source
, env
):
1226 for t
in ORIG_BUILD_TARGETS
:
1227 main
.Depends('#all-targets', t
)
1229 # Each build/* switching_dir attaches its *-environs target to #all-environs.
1230 main
.Append(BUILDERS
= {'CompleteEnvirons' :
1231 Builder(action
=MakeAction(environsComplete
, None))})
1232 main
.CompleteEnvirons('#all-environs', [])
1234 def doNothing(**ignored
): pass
1235 main
.Append(BUILDERS
= {'Dummy': Builder(action
=MakeAction(doNothing
, None))})
1237 # The final target to which all the original targets ultimately get attached.
1238 main
.Dummy('#all-targets', '#all-environs')
1239 BUILD_TARGETS
[:] = ['#all-targets']
1241 ###################################################
1243 # Define build environments for selected configurations.
1245 ###################################################
1247 for variant_path
in variant_paths
:
1248 if not GetOption('silent'):
1249 print "Building in", variant_path
1251 # Make a copy of the build-root environment to use for this config.
1253 env
['BUILDDIR'] = variant_path
1255 # variant_dir is the tail component of build path, and is used to
1256 # determine the build parameters (e.g., 'ALPHA_SE')
1257 (build_root
, variant_dir
) = splitpath(variant_path
)
1259 # Set env variables according to the build directory config.
1260 sticky_vars
.files
= []
1261 # Variables for $BUILD_ROOT/$VARIANT_DIR are stored in
1262 # $BUILD_ROOT/variables/$VARIANT_DIR so you can nuke
1263 # $BUILD_ROOT/$VARIANT_DIR without losing your variables settings.
1264 current_vars_file
= joinpath(build_root
, 'variables', variant_dir
)
1265 if isfile(current_vars_file
):
1266 sticky_vars
.files
.append(current_vars_file
)
1267 if not GetOption('silent'):
1268 print "Using saved variables file %s" % current_vars_file
1270 # Build dir-specific variables file doesn't exist.
1272 # Make sure the directory is there so we can create it later
1273 opt_dir
= dirname(current_vars_file
)
1274 if not isdir(opt_dir
):
1277 # Get default build variables from source tree. Variables are
1278 # normally determined by name of $VARIANT_DIR, but can be
1279 # overridden by '--default=' arg on command line.
1280 default
= GetOption('default')
1281 opts_dir
= joinpath(main
.root
.abspath
, 'build_opts')
1283 default_vars_files
= [joinpath(build_root
, 'variables', default
),
1284 joinpath(opts_dir
, default
)]
1286 default_vars_files
= [joinpath(opts_dir
, variant_dir
)]
1287 existing_files
= filter(isfile
, default_vars_files
)
1289 default_vars_file
= existing_files
[0]
1290 sticky_vars
.files
.append(default_vars_file
)
1291 print "Variables file %s not found,\n using defaults in %s" \
1292 % (current_vars_file
, default_vars_file
)
1294 print "Error: cannot find variables file %s or " \
1295 "default file(s) %s" \
1296 % (current_vars_file
, ' or '.join(default_vars_files
))
1299 # Apply current variable settings to env
1300 sticky_vars
.Update(env
)
1302 help_texts
["local_vars"] += \
1303 "Build variables for %s:\n" % variant_dir \
1304 + sticky_vars
.GenerateHelpText(env
)
1306 # Process variable settings.
1308 if not have_fenv
and env
['USE_FENV']:
1309 print "Warning: <fenv.h> not available; " \
1310 "forcing USE_FENV to False in", variant_dir
+ "."
1311 env
['USE_FENV'] = False
1313 if not env
['USE_FENV']:
1314 print "Warning: No IEEE FP rounding mode control in", variant_dir
+ "."
1315 print " FP results may deviate slightly from other platforms."
1318 env
.Append(LIBS
=['efence'])
1322 print "Warning: Can not enable KVM, host seems to lack KVM support"
1323 env
['USE_KVM'] = False
1324 elif not have_posix_timers
:
1325 print "Warning: Can not enable KVM, host seems to lack support " \
1327 env
['USE_KVM'] = False
1328 elif not is_isa_kvm_compatible(env
['TARGET_ISA']):
1329 print "Info: KVM support disabled due to unsupported host and " \
1330 "target ISA combination"
1331 env
['USE_KVM'] = False
1333 # Warn about missing optional functionality
1335 if not main
['HAVE_PERF_ATTR_EXCLUDE_HOST']:
1336 print "Warning: perf_event headers lack support for the " \
1337 "exclude_host attribute. KVM instruction counts will " \
1340 # Save sticky variable settings back to current variables file
1341 sticky_vars
.Save(current_vars_file
, env
)
1344 env
.Append(CCFLAGS
=['-msse2'])
1346 # The src/SConscript file sets up the build rules in 'env' according
1347 # to the configured variables. It returns a list of environments,
1348 # one for each variant build (debug, opt, etc.)
1349 SConscript('src/SConscript', variant_dir
= variant_path
, exports
= 'env')
1351 def pairwise(iterable
):
1352 "s -> (s0,s1), (s1,s2), (s2, s3), ..."
1353 a
, b
= itertools
.tee(iterable
)
1355 return itertools
.izip(a
, b
)
1357 # Create false dependencies so SCons will parse ISAs, establish
1358 # dependencies, and setup the build Environments serially. Either
1359 # SCons (likely) and/or our SConscripts (possibly) cannot cope with -j
1360 # greater than 1. It appears to be standard race condition stuff; it
1361 # doesn't always fail, but usually, and the behaviors are different.
1362 # Every time I tried to remove this, builds would fail in some
1363 # creative new way. So, don't do that. You'll want to, though, because
1364 # tests/SConscript takes a long time to make its Environments.
1365 for t1
, t2
in pairwise(sorted(all_isa_deps
.iterkeys())):
1366 main
.Depends('#%s-deps' % t2
, '#%s-deps' % t1
)
1367 main
.Depends('#%s-environs' % t2
, '#%s-environs' % t1
)
1371 Usage: scons [scons options] [build variables] [target(s)]
1373 Extra scons options:
1376 Global build variables: