CONFIG_TOOLCHAIN_HAS_V is not available for the selected architecture x86.
Result is shown for architecture riscv

CONFIG_TOOLCHAIN_HAS_V (not configurable)

configname: CONFIG_TOOLCHAIN_HAS_V

Linux Kernel Configuration
└─>Platform type
└─>TOOLCHAIN_HAS_V
In linux kernel since version 4.14.326 (release Date: 2023-09-23)
depends
CONFIG_AS_HAS_OPTION_ARCH
CONFIG_LD_VERSION=CONFIG_23800 or CONFIG_LLD_VERSION=CONFIG_140000
CONFIG_cc-option or NOT CONFIG_32BIT
CONFIG_cc-option or NOT CONFIG_64BIT

is selected by
CONFIG_RISCV_ISA_V