SConstruct

"""
Notes: 
- shared library support is buggy: it assumes that a static and dynamic library can be build from the same object files. This is not true on many platforms. For this reason it is only enabled on linux-gcc at the current time.

To add a platform:
- add its name in options allowed_values below
- add tool initialization for this platform. Search for "if platform == 'suncc'" as an example.
"""

import os
import os.path
import sys

JSONCPP_VERSION = open(File('#version').abspath,'rt').read().strip()
DIST_DIR = '#dist'

options = Variables()
options.Add( EnumVariable('platform',
 'Platform (compiler/stl) used to build the project',
 'msvc71',
 allowed_values='suncc vacpp mingw msvc6 msvc7 msvc71 msvc80 msvc90 linux-gcc'.split(),
 ignorecase=2) )

try:
 platform = ARGUMENTS['platform']
 if platform == 'linux-gcc':
 CXX = 'g++' # not quite right, but env is not yet available.
 import commands
 version = commands.getoutput('%s -dumpversion' %CXX)
 platform = 'linux-gcc-%s' %version
 print "Using platform '%s'" %platform
 LD_LIBRARY_PATH = os.environ.get('LD_LIBRARY_PATH', '')
 LD_LIBRARY_PATH = "%s:libs/%s" %(LD_LIBRARY_PATH, platform)
 os.environ['LD_LIBRARY_PATH'] = LD_LIBRARY_PATH
 print "LD_LIBRARY_PATH =", LD_LIBRARY_PATH
except KeyError:
 print 'You must specify a "platform"'
 sys.exit(2)

print "Building using PLATFORM =", platform

rootbuild_dir = Dir('#buildscons')
build_dir = os.path.join( '#buildscons', platform )
bin_dir = os.path.join( '#bin', platform )
lib_dir = os.path.join( '#libs', platform )
sconsign_dir_path = Dir(build_dir).abspath
sconsign_path = os.path.join( sconsign_dir_path, '.sconsign.dbm' )

# Ensure build directory exist (SConsignFile fail otherwise!)
if not os.path.exists( sconsign_dir_path ):
 os.makedirs( sconsign_dir_path )

# Store all dependencies signature in a database
SConsignFile( sconsign_path )

def make_environ_vars():
	"""Returns a dictionnary with environment variable to use when compiling."""
	# PATH is required to find the compiler
	# TEMP is required for at least mingw
 # LD_LIBRARY_PATH & co is required on some system for the compiler
	vars = {}
	for name in ('PATH', 'TEMP', 'TMP', 'LD_LIBRARY_PATH', 'LIBRARY_PATH'):
		if name in os.environ:
			vars[name] = os.environ[name]
	return vars
	

env = Environment( ENV = make_environ_vars(),
 toolpath = ['scons-tools'],
 tools=[] ) #, tools=['default'] )

if platform == 'suncc':
 env.Tool( 'sunc++' )
 env.Tool( 'sunlink' )
 env.Tool( 'sunar' )
 env.Append( CCFLAGS = ['-mt'] )
elif platform == 'vacpp':
 env.Tool( 'default' )
 env.Tool( 'aixcc' )
 env['CXX'] = 'xlC_r' #scons does not pick-up the correct one !
 # using xlC_r ensure multi-threading is enabled:
 # http://publib.boulder.ibm.com/infocenter/pseries/index.jsp?topic=/com.ibm.vacpp7a.doc/compiler/ref/cuselect.htm
 env.Append( CCFLAGS = '-qrtti=all',
 LINKFLAGS='-bh:5' ) # -bh:5 remove duplicate symbol warning
elif platform == 'msvc6':
 env['MSVS_VERSION']='6.0'
 for tool in ['msvc', 'msvs', 'mslink', 'masm', 'mslib']:
 env.Tool( tool )
 env['CXXFLAGS']='-GR -GX /nologo /MT'
elif platform == 'msvc70':
 env['MSVS_VERSION']='7.0'
 for tool in ['msvc', 'msvs', 'mslink', 'masm', 'mslib']:
 env.Tool( tool )
 env['CXXFLAGS']='-GR -GX /nologo /MT'
elif platform == 'msvc71':
 env['MSVS_VERSION']='7.1'
 for tool in ['msvc', 'msvs', 'mslink', 'masm', 'mslib']:
 env.Tool( tool )
 env['CXXFLAGS']='-GR -GX /nologo /MT'
elif platform == 'msvc80':
 env['MSVS_VERSION']='8.0'
 for tool in ['msvc', 'msvs', 'mslink', 'masm', 'mslib']:
 env.Tool( tool )
 env['CXXFLAGS']='-GR -EHsc /nologo /MT'
elif platform == 'msvc90':
 env['MSVS_VERSION']='9.0'
 # Scons 1.2 fails to detect the correct location of the platform SDK.
 # So we propagate those from the environment. This requires that the
 # user run vcvars32.bat before compiling.
 if 'INCLUDE' in os.environ:
 env['ENV']['INCLUDE'] = os.environ['INCLUDE']
 if 'LIB' in os.environ:
 env['ENV']['LIB'] = os.environ['LIB']
 for tool in ['msvc', 'msvs', 'mslink', 'masm', 'mslib']:
 env.Tool( tool )
 env['CXXFLAGS']='-GR -EHsc /nologo /MT'
elif platform == 'mingw':
 env.Tool( 'mingw' )
 env.Append( CPPDEFINES=[ "WIN32", "NDEBUG", "_MT" ] )
elif platform.startswith('linux-gcc'):
 env.Tool( 'default' )
 env.Append( LIBS = ['pthread'], CCFLAGS = os.environ.get("CXXFLAGS", "-Wall"), LINKFLAGS=os.environ.get("LDFLAGS", "") )
 env['SHARED_LIB_ENABLED'] = True
else:
 print "UNSUPPORTED PLATFORM."
 env.Exit(1)

env.Tool('targz')
env.Tool('srcdist')
env.Tool('globtool')

env.Append( CPPPATH = ['#include'],
 LIBPATH = lib_dir )
short_platform = platform
if short_platform.startswith('msvc'):
 short_platform = short_platform[2:]
# Notes: on Windows you need to rebuild the source for each variant
# Build script does not support that yet so we only build static libraries.
# This also fails on AIX because both dynamic and static library ends with
# extension .a.
env['SHARED_LIB_ENABLED'] = env.get('SHARED_LIB_ENABLED', False)
env['LIB_PLATFORM'] = short_platform
env['LIB_LINK_TYPE'] = 'lib' # static
env['LIB_CRUNTIME'] = 'mt'
env['LIB_NAME_SUFFIX'] = '${LIB_PLATFORM}_${LIB_LINK_TYPE}${LIB_CRUNTIME}' # must match autolink naming convention
env['JSONCPP_VERSION'] = JSONCPP_VERSION
env['BUILD_DIR'] = env.Dir(build_dir)
env['ROOTBUILD_DIR'] = env.Dir(rootbuild_dir)
env['DIST_DIR'] = DIST_DIR
if 'TarGz' in env['BUILDERS']:
	class SrcDistAdder:
		def __init__( self, env ):
			self.env = env
		def __call__( self, *args, **kw ):
			apply( self.env.SrcDist, (self.env['SRCDIST_TARGET'],) + args, kw )
	env['SRCDIST_BUILDER'] = env.TarGz
else: # If tarfile module is missing
	class SrcDistAdder:
		def __init__( self, env ):
			pass
		def __call__( self, *args, **kw ):
			pass
env['SRCDIST_ADD'] = SrcDistAdder( env )
env['SRCDIST_TARGET'] = os.path.join( DIST_DIR, 'jsoncpp-src-%s.tar.gz' % env['JSONCPP_VERSION'] )
 
env_testing = env.Clone( )
env_testing.Append( LIBS = ['json_${LIB_NAME_SUFFIX}'] )

def buildJSONExample( env, target_sources, target_name ):
 env = env.Clone()
 env.Append( CPPPATH = ['#'] )
 exe = env.Program( target=target_name,
 source=target_sources )
 env['SRCDIST_ADD']( source=[target_sources] )
 global bin_dir
 return env.Install( bin_dir, exe )

def buildJSONTests( env, target_sources, target_name ):
 jsontests_node = buildJSONExample( env, target_sources, target_name )
 check_alias_target = env.Alias( 'check', jsontests_node, RunJSONTests( jsontests_node, jsontests_node ) )
 env.AlwaysBuild( check_alias_target )

def buildUnitTests( env, target_sources, target_name ):
 jsontests_node = buildJSONExample( env, target_sources, target_name )
 check_alias_target = env.Alias( 'check', jsontests_node, 
 RunUnitTests( jsontests_node, jsontests_node ) )
 env.AlwaysBuild( check_alias_target )

def buildLibrary( env, target_sources, target_name ):
 static_lib = env.StaticLibrary( target=target_name + '_${LIB_NAME_SUFFIX}',
 source=target_sources )
 global lib_dir
 env.Install( lib_dir, static_lib )
 if env['SHARED_LIB_ENABLED']:
 shared_lib = env.SharedLibrary( target=target_name + '_${LIB_NAME_SUFFIX}',
 source=target_sources )
 env.Install( lib_dir, shared_lib )
 env['SRCDIST_ADD']( source=[target_sources] )

Export( 'env env_testing buildJSONExample buildLibrary buildJSONTests buildUnitTests' )

def buildProjectInDirectory( target_directory ):
 global build_dir
 target_build_dir = os.path.join( build_dir, target_directory )
 target = os.path.join( target_directory, 'sconscript' )
 SConscript( target, build_dir=target_build_dir, duplicate=0 )
 env['SRCDIST_ADD']( source=[target] )


def runJSONTests_action( target, source = None, env = None ):
 # Add test scripts to python path
 jsontest_path = Dir( '#test' ).abspath
 sys.path.insert( 0, jsontest_path )
 data_path = os.path.join( jsontest_path, 'data' )
 import runjsontests
 return runjsontests.runAllTests( os.path.abspath(source[0].path), data_path )

def runJSONTests_string( target, source = None, env = None ):
 return 'RunJSONTests("%s")' % source[0]

import SCons.Action
ActionFactory = SCons.Action.ActionFactory
RunJSONTests = ActionFactory(runJSONTests_action, runJSONTests_string )

def runUnitTests_action( target, source = None, env = None ):
 # Add test scripts to python path
 jsontest_path = Dir( '#test' ).abspath
 sys.path.insert( 0, jsontest_path )
 import rununittests
 return rununittests.runAllTests( os.path.abspath(source[0].path) )

def runUnitTests_string( target, source = None, env = None ):
 return 'RunUnitTests("%s")' % source[0]

RunUnitTests = ActionFactory(runUnitTests_action, runUnitTests_string )

env.Alias( 'check' )

srcdist_cmd = env['SRCDIST_ADD']( source = """
 AUTHORS README.md SConstruct
 """.split() )
env.Alias( 'src-dist', srcdist_cmd )

buildProjectInDirectory( 'src/jsontestrunner' )
buildProjectInDirectory( 'src/lib_json' )
buildProjectInDirectory( 'src/test_lib_json' )
#print env.Dump()