New in version 3.10.
This is a CMake Environment Variable. Its initial value is taken from the calling process environment.
Preferred executable for compiling a specific dialect of assembly language files. ASM<DIALECT> can be ASM, ASM_NASM (Netwide Assembler), ASM_MASM (Microsoft Assembler) or ASM-ATT (Assembler AT&T). Will only be used by CMake on the first configuration to determine ASM<DIALECT> compiler, after which the value for ASM<DIALECT> is stored in the cache as CMAKE_ASM<DIALECT>_COMPILER. For subsequent configuration runs, the environment variable will be ignored in favor of CMAKE_ASM<DIALECT>_COMPILER.
Note
Options that are required to make the compiler work correctly can be included; they can not be changed.
$ export ASM="custom-compiler --arg1 --arg2"
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https://cmake.org/cmake/help/v3.19/envvar/ASM_DIALECT.html