1tpm_ss = ss.source_set() 2 3tpm_ss.add(files('tpm_backend.c')) 4tpm_ss.add(files('tpm_util.c')) 5tpm_ss.add(when: 'CONFIG_TPM_PASSTHROUGH', if_true: files('tpm_passthrough.c')) 6tpm_ss.add(when: 'CONFIG_TPM_EMULATOR', if_true: files('tpm_emulator.c')) 7 8softmmu_ss.add_all(when: 'CONFIG_TPM', if_true: tpm_ss) 9