CONFIG_HAVE_KMSAN_COMPILER (not configurable)

configname: CONFIG_HAVE_KMSAN_COMPILER

Linux Kernel Configuration
└─>Kernel hacking
└─>Memory Debugging
└─>HAVE_KMSAN_COMPILER
In linux kernel since version 4.14.326 (release Date: 2023-09-23)  
depends
CONFIG_CC_IS_CLANG
CONFIG_CLANG_VERSIONCONFIG_140000

is selected by
CONFIG_KMSAN