def defineBuildEnvironment():
""" create a custom build environment,
define the basic compiler and linker flags,
define locations in source and target tree,
parse the commandline and pick up options
"""
EnsureSConsVersion(2,0)
EnsurePythonVersion(2,6)
Decider('MD5-timestamp') # detect changed files by timestamp, then do a MD5
buildVars = Variables([OPTCACHE, CUSTOPTFILE])
Options.defineCmdlineVariables(buildVars)
env = LumieraEnvironment(buildSetup, buildVars)
env.Replace( CPPPATH =["#src"] # used to find includes, "#" means always absolute to build-root
, CPPDEFINES=['LUMIERA_VERSION='+VERSION ] # note: it's a list to append further defines
, CCFLAGS='-Wall -Wextra -Wformat-security'
, CXXFLAGS='-std=gnu++14 -Wno-enum-compare -Wno-noexcept-type'
, CFLAGS='-std=gnu99'
)
env.Append(LINKFLAGS='-Wl,--no-undefined') # require every dependency is given on link, in the right order
env.Append(LINKFLAGS='-Wl,--as-needed') # by default only link against dependencies actually needed to resolve symbols
handleVerboseMessages(env)
handleNoBugSwitches(env)
env.Append(CPPDEFINES = '_GNU_SOURCE')
appendCppDefine(env,'DEBUG','DEBUG', 'NDEBUG')
# appendCppDefine(env,'OPENGL','USE_OPENGL')
appendVal(env,'ARCHFLAGS','CCFLAGS') # for both C and C++
appendVal(env,'OPTIMIZE', 'CCFLAGS', val=' -O3')
appendVal(env,'DEBUG', 'CCFLAGS', val=' -ggdb')
# setup search path for Lumiera plugins
appendCppDefine(env,'PKGLIBDIR','LUMIERA_PLUGIN_PATH=\\"$PKGLIBDIR/:ORIGIN/modules\\"'
,'LUMIERA_PLUGIN_PATH=\\"ORIGIN/modules\\"')
appendCppDefine(env,'PKGDATADIR','LUMIERA_CONFIG_PATH=\\"$PKGLIBDIR/:.\\"'
,'LUMIERA_CONFIG_PATH=\\"$DESTDIR/share/lumiera/:.\\"')
Options.prepareOptionsHelp(buildVars,env)
buildVars.Save(OPTCACHE, env)
return env
