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Compile variables are accessible by importing the "builtin" package, which the compiler makes available to every Zig source file. It contains compile-time constants such as the current target, endianness, and release mode.
const builtin = @import("builtin");const separator = if (builtin.os == builtin.Os.windows) '\\' else '/';
Example of what is imported with @import("builtin"):
pub const StackTrace = struct {index: usize,instruction_addresses: []usize,};pub const PanicFn = fn([]const u8, ?*StackTrace) noreturn;pub const Os = enum {freestanding,ananas,cloudabi,dragonfly,freebsd,fuchsia,ios,kfreebsd,linux,lv2,macosx,netbsd,openbsd,solaris,windows,haiku,minix,rtems,nacl,cnk,aix,cuda,nvcl,amdhsa,ps4,elfiamcu,tvos,watchos,mesa3d,contiki,amdpal,hermit,hurd,wasi,emscripten,zen,uefi,};pub const Arch = union(enum) {arm: Arm32,armeb: Arm32,aarch64: Arm64,aarch64_be: Arm64,aarch64_32: Arm64,arc,avr,bpfel,bpfeb,hexagon,mips,mipsel,mips64,mips64el,msp430,powerpc,powerpc64,powerpc64le,r600,amdgcn,riscv32,riscv64,sparc,sparcv9,sparcel,s390x,tce,tcele,thumb: Arm32,thumbeb: Arm32,i386,x86_64,xcore,nvptx,nvptx64,le32,le64,amdil,amdil64,hsail,hsail64,spir,spir64,kalimba: Kalimba,shave,lanai,wasm32,wasm64,renderscript32,renderscript64,pub const Arm32 = enum {v8_5a,v8_4a,v8_3a,v8_2a,v8_1a,v8,v8r,v8m_baseline,v8m_mainline,v8_1m_mainline,v7,v7em,v7m,v7s,v7k,v7ve,v6,v6m,v6k,v6t2,v5,v5te,v4t,};pub const Arm64 = enum {v8_5a,v8_4a,v8_3a,v8_2a,v8_1a,v8,v8r,v8m_baseline,v8m_mainline,};pub const Kalimba = enum {v5,v4,v3,};pub const Mips = enum {r6,};};pub const Abi = enum {none,gnu,gnuabin32,gnuabi64,gnueabi,gnueabihf,gnux32,code16,eabi,eabihf,elfv1,elfv2,android,musl,musleabi,musleabihf,msvc,itanium,cygnus,coreclr,simulator,macabi,};pub const ObjectFormat = enum {unknown,coff,elf,macho,wasm,};pub const GlobalLinkage = enum {Internal,Strong,Weak,LinkOnce,};pub const AtomicOrder = enum {Unordered,Monotonic,Acquire,Release,AcqRel,SeqCst,};pub const AtomicRmwOp = enum {Xchg,Add,Sub,And,Nand,Or,Xor,Max,Min,};pub const Mode = enum {Debug,ReleaseSafe,ReleaseFast,ReleaseSmall,};pub const TypeId = enum {Type,Void,Bool,NoReturn,Int,Float,Pointer,Array,Struct,ComptimeFloat,ComptimeInt,Undefined,Null,Optional,ErrorUnion,ErrorSet,Enum,Union,Fn,BoundFn,ArgTuple,Opaque,Frame,AnyFrame,Vector,EnumLiteral,};pub const TypeInfo = union(TypeId) {Type: void,Void: void,Bool: void,NoReturn: void,Int: Int,Float: Float,Pointer: Pointer,Array: Array,Struct: Struct,ComptimeFloat: void,ComptimeInt: void,Undefined: void,Null: void,Optional: Optional,ErrorUnion: ErrorUnion,ErrorSet: ErrorSet,Enum: Enum,Union: Union,Fn: Fn,BoundFn: Fn,ArgTuple: void,Opaque: void,Frame: void,AnyFrame: AnyFrame,Vector: Vector,EnumLiteral: void,pub const Int = struct {is_signed: bool,bits: comptime_int,};pub const Float = struct {bits: comptime_int,};pub const Pointer = struct {size: Size,is_const: bool,is_volatile: bool,alignment: comptime_int,child: type,is_allowzero: bool,pub const Size = enum {One,Many,Slice,C,};};pub const Array = struct {len: comptime_int,child: type,};pub const ContainerLayout = enum {Auto,Extern,Packed,};pub const StructField = struct {name: []const u8,offset: ?comptime_int,field_type: type,};pub const Struct = struct {layout: ContainerLayout,fields: []StructField,decls: []Declaration,};pub const Optional = struct {child: type,};pub const ErrorUnion = struct {error_set: type,payload: type,};pub const Error = struct {name: []const u8,value: comptime_int,};pub const ErrorSet = ?[]Error;pub const EnumField = struct {name: []const u8,value: comptime_int,};pub const Enum = struct {layout: ContainerLayout,tag_type: type,fields: []EnumField,decls: []Declaration,};pub const UnionField = struct {name: []const u8,enum_field: ?EnumField,field_type: type,};pub const Union = struct {layout: ContainerLayout,tag_type: ?type,fields: []UnionField,decls: []Declaration,};pub const CallingConvention = enum {Unspecified,C,Cold,Naked,Stdcall,Async,};pub const FnArg = struct {is_generic: bool,is_noalias: bool,arg_type: ?type,};pub const Fn = struct {calling_convention: CallingConvention,is_generic: bool,is_var_args: bool,return_type: ?type,args: []FnArg,};pub const AnyFrame = struct {child: ?type,};pub const Vector = struct {len: comptime_int,child: type,};pub const Declaration = struct {name: []const u8,is_pub: bool,data: Data,pub const Data = union(enum) {Type: type,Var: type,Fn: FnDecl,pub const FnDecl = struct {fn_type: type,inline_type: Inline,calling_convention: CallingConvention,is_var_args: bool,is_extern: bool,is_export: bool,lib_name: ?[]const u8,return_type: type,arg_names: [][] const u8,pub const Inline = enum {Auto,Always,Never,};};};};};pub const FloatMode = enum {Strict,Optimized,};pub const Endian = enum {Big,Little,};pub const Version = struct {major: u32,minor: u32,patch: u32,};pub const SubSystem = enum {Console,Windows,Posix,Native,EfiApplication,EfiBootServiceDriver,EfiRom,EfiRuntimeDriver,};pub const endian = Endian.Little;pub const is_test = false;pub const single_threaded = false;pub const os = Os.linux;pub const arch = Arch.x86_64;pub const abi = Abi.gnu;pub const glibc_version: ?Version = null;pub const object_format = ObjectFormat.elf;pub const mode = Mode.Debug;pub const link_libc = false;pub const have_error_return_tracing = true;pub const valgrind_support = true;pub const position_independent_code = false;pub const strip_debug_info = false;
See also:
