system_ss.add(when: 'CONFIG_APM', if_true: files('apm.c'))
system_ss.add(when: 'CONFIG_FDC37M81X', if_true: files('fdc37m81x-superio.c'))
system_ss.add(when: 'CONFIG_I82378', if_true: files('i82378.c'))
system_ss.add(when: 'CONFIG_ISA_BUS', if_true: files('isa-bus.c'))
system_ss.add(when: 'CONFIG_ISA_SUPERIO', if_true: files('isa-superio.c'))
system_ss.add(when: 'CONFIG_PC87312', if_true: files('pc87312.c'))
system_ss.add(when: 'CONFIG_PIIX', if_true: files('piix.c'))
system_ss.add(when: 'CONFIG_SMC37C669', if_true: files('smc37c669-superio.c'))
system_ss.add(when: 'CONFIG_VT82C686', if_true: files('vt82c686.c'))

specific_ss.add(when: 'CONFIG_LPC_ICH9', if_true: files('lpc_ich9.c'))