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The following standard conditional symbols are defined:

Category	Symbol	DCC32	DCC64 Since XE2	DCCOSX Since XE2	DCCIOSARM Since XE3	DCCIOS32 Since XE3	DCCAARM In XE5	DCCIOSARM64 Since XE8	Comments
Compiler	DCC	DEFINED	DEFINED	DEFINED	DEFINED	DEFINED	DEFINED	DEFINED
Compiler	VER300 For a list of compiler versions, see Compiler Versions.	DEFINED	DEFINED	DEFINED	DEFINED	DEFINED	DEFINED	DEFINED	For Delphi Seattle, compiler has `VER300` defined.
Platform	CONSOLE	DEFINED	DEFINED	DEFINED	DEFINED	DEFINED	DEFINED	DEFINED	Defined if an application is being compiled as a console application.
	IOS	not defined	not defined	not defined	DEFINED	DEFINED	not defined	DEFINED	Defined if the target platform is iOS. New in XE4/iOS
	IOS32	not defined	not defined	not defined	DEFINED	DEFINED	not defined	not defined	Defined if the target platform is iOS32. Since XE8/iOSarm64
	IOS64	not defined	not defined	not defined	not defined	not defined	not defined	DEFINED	Defined if the target platform is iOS64. Since XE8/iOSarm64
	NATIVECODE	DEFINED	DEFINED	DEFINED	DEFINED	DEFINED	DEFINED	DEFINED	Since Delphi.Net
	MSWINDOWS	DEFINED	DEFINED	not defined	not defined	not defined	not defined	not defined	Indicates that the operating environment is Windows. Use MSWINDOWS to test for any flavor of the Windows platform instead of WIN32.
	WIN32	DEFINED	not defined	not defined	not defined	not defined	not defined	not defined	Target platform is the native 32-bit Windows platform.
	WIN64	not defined	DEFINED	not defined	not defined	not defined	not defined	not defined	Target platform is 64-bit Windows. New in XE2/x64
	MACOS	not defined	not defined	DEFINED	DEFINED	DEFINED	not defined	DEFINED	Target platform is Mac OS X. New in XE2/OSX
	MACOS32	not defined	not defined	DEFINED	DEFINED	DEFINED	not defined	not defined	Target platform is 32-bit Mac OS X. New in XE2/OSX
	MACOS64	not defined	not defined	not defined	not defined	not defined	not defined	DEFINED	Target platform is 64-bit Mac OS X. New in XE8/OSX
	LINUX	not defined	not defined	not defined	not defined	not defined	not defined	not defined	Since Kylix
	LINUX32	not defined	not defined	not defined	not defined	not defined	not defined	not defined	Since Kylix
POSIX	not defined	not defined	DEFINED	DEFINED	DEFINED	DEFINED	DEFINED	Since Kylix
POSIX32	not defined	not defined	DEFINED	DEFINED	DEFINED	DEFINED	DEFINED	Since Kylix
ANDROID	not defined	not defined	not defined	not defined	not defined	DEFINED	not defined	Defined if the target platform is Android. *New in XE5
CPU	CPUARM	not defined	not defined	not defined	DEFINED	not defined	DEFINED	DEFINED	Defined if the CPU is based on the ARM architecture, such as the Delphi mobile compiler for the iOS device (DCCIOSARM.EXE). New in XE4/iOS
	CPU386	DEFINED	not defined	DEFINED	not defined	DEFINED	not defined	not defined	Indicates that the CPU is an Intel 386 or later.
	CPUX86	DEFINED	not defined	DEFINED	not defined	DEFINED	not defined	not defined	CPU is an Intel 386 or later on any platform. New in XE2/x64
	CPUX64	not defined	DEFINED	not defined	not defined	not defined	not defined	not defined	The CPU supports the x86-64 instruction set, and is in a 64-bit environment. New in XE2/x64
	CPU32BITS	DEFINED	not defined	DEFINED	DEFINED	DEFINED	DEFINED	not defined	The CPU is in a 32-bit environment, such as DCC32.EXE. New in XE8
	CPU64BITS	not defined	DEFINED	not defined	not defined	not defined	not defined	DEFINED	The CPU is in a 64-bit environment, such as DCC64.EXE. New in XE8
	CPUARM32	not defined	not defined	not defined	DEFINED	not defined	DEFINED	not defined	The CPU is in a 32-bit ARM environment, such as DCCIOSARM.EXE. New in XE8
	CPUARM64	not defined	not defined	not defined	not defined	not defined	not defined	DEFINED	The CPU is in a 64-bit ARM environment, such as DCCIOSARM64.EXE. New in XE8
Availability
	ALIGN_STACK	not defined	not defined	DEFINED	not defined	DEFINED	not defined	not defined	Defined in code that may be shared with the OS X compiler and another compiler on another platform such as Linux that does not have a rigid stack alignment requirement. For more information, see Eli Boling's blog at http://blogs.embarcadero.com/eboling/2009/05/20/5607 . New in XE2/OSX
	ASSEMBLER	DEFINED	DEFINED	DEFINED	not defined	DEFINED	not defined	not defined	Assembler syntax is accepted.
	AUTOREFCOUNT	not defined	not defined	not defined	DEFINED	DEFINED	DEFINED	DEFINED	Defined for compilers that use automatic reference counting, such as the Delphi mobile compilers. New in XE4/iOS
	EXTERNALLINKER	not defined	not defined	not defined	DEFINED	not defined	DEFINED	DEFINED	Defined for compilers that have an external linker and the LLVM code generator; the Delphi mobile compilers have the external ld linker and use LLVM as code generator. New in XE4/iOS
	UNICODE	DEFINED	DEFINED	DEFINED	DEFINED	DEFINED	DEFINED	DEFINED	UNICODE is defined as the default string type.
	CONDITIONALEXPRESSIONS	DEFINED	DEFINED	DEFINED	DEFINED	DEFINED	DEFINED	DEFINED	Tests for the use of the $IF directive.
	ELF	not defined	not defined	not defined	not defined	not defined	not defined	not defined	Defined when targeting Executable and Linkable Format (ELF) files.
	NEXTGEN	not defined	not defined	not defined	DEFINED	DEFINED	DEFINED	DEFINED	Defined for compilers (such as the Delphi mobile compilers) that use "next-generation" language features, such as 0-based strings. New in XE4/iOS
	PC_MAPPED_EXCEPTIONS	not defined	not defined	DEFINED	not defined	DEFINED	not defined	not defined	Defined when compiling on a platform or for a target platform that uses address maps instead of stack frames to unwind exceptions (such as OS X). New in XE2.
	PIC	never	never	DEFINED if -P is specified	never	DEFINED if -P is specified	always defined	never	Defined for platforms that require Position-Independent Code (PIC), such as OS X.
	UNDERSCOREIMPORTNAME	DEFINED	not defined	DEFINED	not defined	DEFINED	not defined	not defined	Defined for compilers that add a leading underscore (for example, in names of dynamic libraries imported from Mac OS). New in XE4/iOS
	WEAKREF	not defined	not defined	not defined	DEFINED	DEFINED	DEFINED	DEFINED	Defined for compilers that can use weak references (the `[weak]` attribute). New in XE4/iOS
	WEAKINSTREF	not defined	not defined	not defined	DEFINED	DEFINED	DEFINED	DEFINED	Defined when weak references are defined for instances. New in XE4/iOS
	WEAKINTFREF	not defined	not defined	not defined	DEFINED	DEFINED	DEFINED	DEFINED	Defined when weak references are defined for interfaces. New in XE4/iOS

In the table column heads:
DCC32 is the 32-bit Windows Delphi compiler.
DCC64 is the 64-bit Windows Delphi compiler.
DCCOSX is the Mac OS X Delphi compiler.
DCCIOSARM is the Delphi compiler for 32-bit iOS Devices.
DCCIOS32 is the Delphi compiler for iOS Simulators.
DCCAARM.EXE is the Delphi compiler for Android devices.
DCCIOSARM64 is the Delphi compiler for 64-bit iOS devices.

Using Conditional Defines for the Compiler Version

For example, to determine the version of the compiler and run-time library that were used to compile your code, you can use {$IF} with the CompilerVersion, RTLVersion and other constants:

 {$IFDEF CONDITIONALEXPRESSIONS}
    {$IF CompilerVersion >= 17.0}
      {$DEFINE HAS_INLINE}
    {$IFEND}
    {$IF RTLVersion >= 14.0}
      {$DEFINE HAS_ERROUTPUT}
    {$IFEND}
 {$ENDIF}

See the table of Compiler Versions for a list of version numbers associated with various released Delphi compilers.

출처 : http://docwiki.embarcadero.com/RADStudio/Seattle/en/Conditional_compilation_(Delphi)

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Using Conditional Defines for the Compiler Version

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