CONFIG_BUILD_ELF64 is not available for thedefaultarchitecture x86.
Result is shown for architecture 64BIT or mips
default or selected kernelversion does not have config value CONFIG_BUILD_ELF64.
Result is shown for kernelversion 5.4.123
Use 64-bit ELF format for building
configname: CONFIG_BUILD_ELF64
Linux/MIPS Kernel Configuration
└─>Executable file formats
└─>Use 64-bit ELF format for building
In linux kernel since version 2.6.12
A 64-bit kernel is usually built using the 64-bit ELF binary object
format as it's one that allows arbitrary 64-bit constructs. For
kernels that are loaded within the KSEG compatibility segments the
32-bit ELF format can optionally be used resulting in a somewhat
smaller binary, but this option is not explicitly supported by the
toolchain and since binutils 2.14 it does not even work at all.
Say Y to use the 64-bit format or N to use the 32-bit one.
If unsure say Y.
format as it's one that allows arbitrary 64-bit constructs. For
kernels that are loaded within the KSEG compatibility segments the
32-bit ELF format can optionally be used resulting in a somewhat
smaller binary, but this option is not explicitly supported by the
toolchain and since binutils 2.14 it does not even work at all.
Say Y to use the 64-bit format or N to use the 32-bit one.
If unsure say Y.