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commit45be2ad007upstream. Recently, ld.lld moved from '--undefined-version' to '--no-undefined-version' as the default, which breaks building the vDSO when CONFIG_X86_SGX is not set: ld.lld: error: version script assignment of 'LINUX_2.6' to symbol '__vdso_sgx_enter_enclave' failed: symbol not defined __vdso_sgx_enter_enclave is only included in the vDSO when CONFIG_X86_SGX is set. Only export it if it will be present in the final object, which clears up the error. Fixes:8466436952("x86/vdso: Implement a vDSO for Intel SGX enclave call") Signed-off-by: Nathan Chancellor <nathan@kernel.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> Link: https://github.com/ClangBuiltLinux/linux/issues/1756 Link: https://lore.kernel.org/r/20221109000306.1407357-1-nathan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>