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Please tell me where I can find the documents for Apple Clang ARM assembler? After I compiled my C source code to ARM assembly code using Apple Clang, it of course generated a lot of ARM assembly code (GNU syntax), but for some of them I can't find related documents, for example the .build_version directive. The generated ARM assembly code is here: .section __TEXT,__text,regular,pure_instructions .build_version macos, 13, 0 sdk_version 13, 3 .globl _main ; -- Begin function main .p2align 2 _main: ; @main .cfi_startproc ; %bb.0: sub sp, sp, #64 str w8, [sp, #16] ; 4-byte Folded Spill stur wzr, [x29, #-4] ; implicit-def: $x8 ... add sp, sp, #64 ret .cfi_endproc ; -- End function .section __TEXT,__cstring,cstring_literals l_.str: ; @.str .asciz "a + b = %d\r\n" .subsections_via_symbols