# Set up the main build environment.
#
########################################################################
+
+# export TERM so that clang reports errors in color
use_vars = set([ 'AS', 'AR', 'CC', 'CXX', 'HOME', 'LD_LIBRARY_PATH',
'LIBRARY_PATH', 'PATH', 'PKG_CONFIG_PATH', 'PYTHONPATH',
- 'RANLIB', 'SWIG' ])
+ 'RANLIB', 'SWIG', 'TERM' ])
use_prefixes = [
"M5", # M5 configuration (e.g., path to kernels)
main.Append(TCMALLOC_CCFLAGS=['-fno-builtin'])
# On Mac OS X/Darwin we need to also use libc++ (part of XCode) as
- # opposed to libstdc++ to make the transition from TR1 to
- # C++11. See http://libcxx.llvm.org. However, clang has chosen a
- # strict implementation of the C++11 standard, and does not allow
- # incomplete types in template arguments (besides unique_ptr and
- # shared_ptr), and the libc++ STL containers create problems in
- # combination with the current gem5 code. For now, we stick with
- # libstdc++ and use the TR1 namespace.
- # if sys.platform == "darwin":
- # main.Append(CXXFLAGS=['-stdlib=libc++'])
+ # opposed to libstdc++, as the later is dated.
+ if sys.platform == "darwin":
+ main.Append(CXXFLAGS=['-stdlib=libc++'])
+ main.Append(LIBS=['c++'])
else:
print termcap.Yellow + termcap.Bold + 'Error' + termcap.Normal,
print ' Installed version:', swig_version[2]
Exit(1)
-if swig_version[2] in ["2.0.9", "2.0.10"]:
+# Older versions of swig do not play well with more recent versions of
+# gcc due to assumptions on implicit includes (cstddef) and use of
+# namespaces
+if main['GCC'] and compareVersions(gcc_version, '4.6') > 0 and \
+ compareVersions(swig_version[2], '2') < 0:
print '\n' + termcap.Yellow + termcap.Bold + \
- 'Warning: SWIG version 2.0.9/10 sometimes generates broken code.\n' + \
+ 'Warning: SWIG 1.x cause issues with gcc 4.6 and later.\n' + \
termcap.Normal + \
- 'This problem only affects some platforms and some Python\n' + \
- 'versions. See the following SWIG bug report for details:\n' + \
- 'http://sourceforge.net/p/swig/bugs/1297/\n'
-
+ 'Use SWIG 2.x to avoid assumptions on implicit includes\n' + \
+ 'and use of namespaces\n'
# Set up SWIG flags & scanner
swig_flags=Split('-c++ -python -modern -templatereduce $_CPPINCFLAGS')
context.Result(ret)
return ret
+# Add a custom Check function to test for structure members.
+def CheckMember(context, include, decl, member, include_quotes="<>"):
+ context.Message("Checking for member %s in %s..." %
+ (member, decl))
+ text = """
+#include %(header)s
+int main(){
+ %(decl)s test;
+ (void)test.%(member)s;
+ return 0;
+};
+""" % { "header" : include_quotes[0] + include + include_quotes[1],
+ "decl" : decl,
+ "member" : member,
+ }
+
+ ret = context.TryCompile(text, extension=".cc")
+ context.Result(ret)
+ return ret
+
# Platform-specific configuration. Note again that we assume that all
# builds under a given build root run on the same host platform.
conf = Configure(main,
conf_dir = joinpath(build_root, '.scons_config'),
log_file = joinpath(build_root, 'scons_config.log'),
- custom_tests = { 'CheckLeading' : CheckLeading })
+ custom_tests = {
+ 'CheckLeading' : CheckLeading,
+ 'CheckMember' : CheckMember,
+ })
# Check for leading underscores. Don't really need to worry either
# way so don't need to check the return code.
conf.CheckLibWithHeader('rt', 'time.h', 'C',
'clock_nanosleep(0,0,NULL,NULL);')
+have_posix_timers = \
+ conf.CheckLibWithHeader([None, 'rt'], [ 'time.h', 'signal.h' ], 'C',
+ 'timer_create(CLOCK_MONOTONIC, NULL, NULL);')
+
if conf.CheckLib('tcmalloc'):
main.Append(CCFLAGS=main['TCMALLOC_CCFLAGS'])
elif conf.CheckLib('tcmalloc_minimal'):
print "Warning: Header file <fenv.h> not found."
print " This host has no IEEE FP rounding mode control."
-# Check if we should enable KVM-based hardware virtualization
-have_kvm = conf.CheckHeader('linux/kvm.h', '<>')
+# Check if we should enable KVM-based hardware virtualization. The API
+# we rely on exists since version 2.6.36 of the kernel, but somehow
+# the KVM_API_VERSION does not reflect the change. We test for one of
+# the types as a fall back.
+have_kvm = conf.CheckHeader('linux/kvm.h', '<>') and \
+ conf.CheckTypeSize('struct kvm_xsave', '#include <linux/kvm.h>') != 0
if not have_kvm:
- print "Info: Header file <linux/kvm.h> not found, " \
+ print "Info: Compatible header file <linux/kvm.h> not found, " \
"disabling KVM support."
# Check if the requested target ISA is compatible with the host
def is_isa_kvm_compatible(isa):
isa_comp_table = {
"arm" : ( "armv7l" ),
+ "x86" : ( "x86_64" ),
}
try:
import platform
return host_isa in isa_comp_table.get(isa, [])
+# Check if the exclude_host attribute is available. We want this to
+# get accurate instruction counts in KVM.
+main['HAVE_PERF_ATTR_EXCLUDE_HOST'] = conf.CheckMember(
+ 'linux/perf_event.h', 'struct perf_event_attr', 'exclude_host')
+
+
######################################################################
#
# Finish the configuration
# These variables get exported to #defines in config/*.hh (see src/SConscript).
export_vars += ['USE_FENV', 'SS_COMPATIBLE_FP', 'TARGET_ISA', 'CP_ANNOTATE',
- 'USE_POSIX_CLOCK', 'PROTOCOL', 'HAVE_PROTOBUF']
+ 'USE_POSIX_CLOCK', 'PROTOCOL', 'HAVE_PROTOBUF',
+ 'HAVE_PERF_ATTR_EXCLUDE_HOST']
###################################################
#
main.SConscript('ext/libfdt/SConscript',
variant_dir = joinpath(build_root, 'libfdt'))
+# fputils build is shared across all configs in the build root.
+main.SConscript('ext/fputils/SConscript',
+ variant_dir = joinpath(build_root, 'fputils'))
+
###################################################
#
# This function is used to set up a directory with switching headers
if not have_kvm:
print "Warning: Can not enable KVM, host seems to lack KVM support"
env['USE_KVM'] = False
+ elif not have_posix_timers:
+ print "Warning: Can not enable KVM, host seems to lack support " \
+ "for POSIX timers"
+ env['USE_KVM'] = False
elif not is_isa_kvm_compatible(env['TARGET_ISA']):
print "Info: KVM support disabled due to unsupported host and " \
"target ISA combination"
env['USE_KVM'] = False
+ # Warn about missing optional functionality
+ if env['USE_KVM']:
+ if not main['HAVE_PERF_ATTR_EXCLUDE_HOST']:
+ print "Warning: perf_event headers lack support for the " \
+ "exclude_host attribute. KVM instruction counts will " \
+ "be inaccurate."
+
# Save sticky variable settings back to current variables file
sticky_vars.Save(current_vars_file, env)
projects / gem5.git / blobdiff