raise
# Global Python includes
+import itertools
import os
import re
import subprocess
Exit(1)
if main['GCC']:
- # Check for a supported version of gcc, >= 4.4 is needed for c++0x
- # support. See http://gcc.gnu.org/projects/cxx0x.html for details
+ # Check for a supported version of gcc. >= 4.6 is chosen for its
+ # level of c++11 support. See
+ # http://gcc.gnu.org/projects/cxx0x.html for details. 4.6 is also
+ # the first version with proper LTO support.
gcc_version = readCommand([main['CXX'], '-dumpversion'], exception=False)
- if compareVersions(gcc_version, "4.4") < 0:
- print 'Error: gcc version 4.4 or newer required.'
+ if compareVersions(gcc_version, "4.6") < 0:
+ print 'Error: gcc version 4.6 or newer required.'
print ' Installed version:', gcc_version
Exit(1)
main['GCC_VERSION'] = gcc_version
- # Check for versions with bugs
- if not compareVersions(gcc_version, '4.4.1') or \
- not compareVersions(gcc_version, '4.4.2'):
- print 'Info: Tree vectorizer in GCC 4.4.1 & 4.4.2 is buggy, disabling.'
- main.Append(CCFLAGS=['-fno-tree-vectorize'])
-
- # LTO support is only really working properly from 4.6 and beyond
- if compareVersions(gcc_version, '4.6') >= 0:
- # Add the appropriate Link-Time Optimization (LTO) flags
- # unless LTO is explicitly turned off. Note that these flags
- # are only used by the fast target.
- if not GetOption('no_lto'):
- # Pass the LTO flag when compiling to produce GIMPLE
- # output, we merely create the flags here and only append
- # them later/
- main['LTO_CCFLAGS'] = ['-flto=%d' % GetOption('num_jobs')]
-
- # Use the same amount of jobs for LTO as we are running
- # scons with, we hardcode the use of the linker plugin
- # which requires either gold or GNU ld >= 2.21
- main['LTO_LDFLAGS'] = ['-flto=%d' % GetOption('num_jobs'),
- '-fuse-linker-plugin']
+ # gcc from version 4.8 and above generates "rep; ret" instructions
+ # to avoid performance penalties on certain AMD chips. Older
+ # assemblers detect this as an error, "Error: expecting string
+ # instruction after `rep'"
+ if compareVersions(gcc_version, "4.8") > 0:
+ as_version = readCommand([main['AS'], '-v', '/dev/null'],
+ exception=False).split()
+
+ if not as_version or compareVersions(as_version[-1], "2.23") < 0:
+ print termcap.Yellow + termcap.Bold + \
+ 'Warning: This combination of gcc and binutils have' + \
+ ' known incompatibilities.\n' + \
+ ' If you encounter build problems, please update ' + \
+ 'binutils to 2.23.' + \
+ termcap.Normal
+
+ # Add the appropriate Link-Time Optimization (LTO) flags
+ # unless LTO is explicitly turned off. Note that these flags
+ # are only used by the fast target.
+ if not GetOption('no_lto'):
+ # Pass the LTO flag when compiling to produce GIMPLE
+ # output, we merely create the flags here and only append
+ # them later/
+ main['LTO_CCFLAGS'] = ['-flto=%d' % GetOption('num_jobs')]
+
+ # Use the same amount of jobs for LTO as we are running
+ # scons with, we hardcode the use of the linker plugin
+ # which requires either gold or GNU ld >= 2.21
+ main['LTO_LDFLAGS'] = ['-flto=%d' % GetOption('num_jobs'),
+ '-fuse-linker-plugin']
main.Append(TCMALLOC_CCFLAGS=['-fno-builtin-malloc', '-fno-builtin-calloc',
'-fno-builtin-realloc', '-fno-builtin-free'])
elif main['CLANG']:
- # Check for a supported version of clang, >= 2.9 is needed to
- # support similar features as gcc 4.4. See
+ # Check for a supported version of clang, >= 3.0 is needed to
+ # support similar features as gcc 4.6. See
# http://clang.llvm.org/cxx_status.html for details
clang_version_re = re.compile(".* version (\d+\.\d+)")
clang_version_match = clang_version_re.search(CXX_version)
if (clang_version_match):
clang_version = clang_version_match.groups()[0]
- if compareVersions(clang_version, "2.9") < 0:
- print 'Error: clang version 2.9 or newer required.'
+ if compareVersions(clang_version, "3.0") < 0:
+ print 'Error: clang version 3.0 or newer required.'
print ' Installed version:', clang_version
Exit(1)
else:
# is relying on this
main.Append(CCFLAGS=['-Wno-tautological-compare',
'-Wno-parentheses',
- '-Wno-self-assign'])
+ '-Wno-self-assign',
+ # Some versions of libstdc++ (4.8?) seem to
+ # use struct hash and class hash
+ # interchangeably.
+ '-Wno-mismatched-tags',
+ ])
main.Append(TCMALLOC_CCFLAGS=['-fno-builtin'])
# Dict of available CPU model objects. Accessible as CpuModel.dict.
dict = {}
- list = []
- defaults = []
# Constructor. Automatically adds models to CpuModel.dict.
- def __init__(self, name, filename, includes, strings, default=False):
+ def __init__(self, name, default=False):
self.name = name # name of model
- self.filename = filename # filename for output exec code
- self.includes = includes # include files needed in exec file
- # The 'strings' dict holds all the per-CPU symbols we can
- # substitute into templates etc.
- self.strings = strings
# This cpu is enabled by default
self.default = default
if name in CpuModel.dict:
raise AttributeError, "CpuModel '%s' already registered" % name
CpuModel.dict[name] = self
- CpuModel.list.append(name)
Export('CpuModel')
EnumVariable('TARGET_ISA', 'Target ISA', 'alpha', all_isa_list),
ListVariable('CPU_MODELS', 'CPU models',
sorted(n for n,m in CpuModel.dict.iteritems() if m.default),
- sorted(CpuModel.list)),
+ sorted(CpuModel.dict.keys())),
BoolVariable('EFENCE', 'Link with Electric Fence malloc debugger',
False),
BoolVariable('SS_COMPATIBLE_FP',
###################################################
main['ALL_ISA_LIST'] = all_isa_list
+all_isa_deps = {}
def make_switching_dir(dname, switch_headers, env):
# Generate the header. target[0] is the full path of the output
# header to generate. 'source' is a dummy variable, since we get the
# list of ISAs from env['ALL_ISA_LIST'].
def gen_switch_hdr(target, source, env):
fname = str(target[0])
- f = open(fname, 'w')
isa = env['TARGET_ISA'].lower()
- print >>f, '#include "%s/%s/%s"' % (dname, isa, basename(fname))
- f.close()
+ try:
+ f = open(fname, 'w')
+ print >>f, '#include "%s/%s/%s"' % (dname, isa, basename(fname))
+ f.close()
+ except IOError:
+ print "Failed to create %s" % fname
+ raise
# Build SCons Action object. 'varlist' specifies env vars that this
# action depends on; when env['ALL_ISA_LIST'] changes these actions
# Instantiate actions for each header
for hdr in switch_headers:
env.Command(hdr, [], switch_hdr_action)
+
+ isa_target = Dir('.').up().name.lower().replace('_', '-')
+ env['PHONY_BASE'] = '#'+isa_target
+ all_isa_deps[isa_target] = None
+
Export('make_switching_dir')
+# all-isas -> all-deps -> all-environs -> all_targets
+main.Alias('#all-isas', [])
+main.Alias('#all-deps', '#all-isas')
+
+# Dummy target to ensure all environments are created before telling
+# SCons what to actually make (the command line arguments). We attach
+# them to the dependence graph after the environments are complete.
+ORIG_BUILD_TARGETS = list(BUILD_TARGETS) # force a copy; gets closure to work.
+def environsComplete(target, source, env):
+ for t in ORIG_BUILD_TARGETS:
+ main.Depends('#all-targets', t)
+
+# Each build/* switching_dir attaches its *-environs target to #all-environs.
+main.Append(BUILDERS = {'CompleteEnvirons' :
+ Builder(action=MakeAction(environsComplete, None))})
+main.CompleteEnvirons('#all-environs', [])
+
+def doNothing(**ignored): pass
+main.Append(BUILDERS = {'Dummy': Builder(action=MakeAction(doNothing, None))})
+
+# The final target to which all the original targets ultimately get attached.
+main.Dummy('#all-targets', '#all-environs')
+BUILD_TARGETS[:] = ['#all-targets']
+
###################################################
#
# Define build environments for selected configurations.
# The src/SConscript file sets up the build rules in 'env' according
# to the configured variables. It returns a list of environments,
# one for each variant build (debug, opt, etc.)
- envList = SConscript('src/SConscript', variant_dir = variant_path,
- exports = 'env')
-
- # Set up the regression tests for each build.
- for e in envList:
- SConscript('tests/SConscript',
- variant_dir = joinpath(variant_path, 'tests', e.Label),
- exports = { 'env' : e }, duplicate = False)
+ SConscript('src/SConscript', variant_dir = variant_path, exports = 'env')
+
+def pairwise(iterable):
+ "s -> (s0,s1), (s1,s2), (s2, s3), ..."
+ a, b = itertools.tee(iterable)
+ b.next()
+ return itertools.izip(a, b)
+
+# Create false dependencies so SCons will parse ISAs, establish
+# dependencies, and setup the build Environments serially. Either
+# SCons (likely) and/or our SConscripts (possibly) cannot cope with -j
+# greater than 1. It appears to be standard race condition stuff; it
+# doesn't always fail, but usually, and the behaviors are different.
+# Every time I tried to remove this, builds would fail in some
+# creative new way. So, don't do that. You'll want to, though, because
+# tests/SConscript takes a long time to make its Environments.
+for t1, t2 in pairwise(sorted(all_isa_deps.iterkeys())):
+ main.Depends('#%s-deps' % t2, '#%s-deps' % t1)
+ main.Depends('#%s-environs' % t2, '#%s-environs' % t1)
# base help text
Help('''
projects / gem5.git / blobdiff