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Predefined Macros

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The C++ compiler predefines certain global identifiers, known as manifest constants. Most global identifiers begin and end with two underscores (__).

Note: For readability, underscores are often separated by a single blank space. In your source code, you should never insert whitespace between underscores.

For macros whose value takes the form of 0x0nnn, the version number (nnn) is determined by the version number of the associated C++ compiler executable. Beginning with the XE release, you can verify the version number using the --version option to BCC32.EXE.


Macro Value Description

__ANDROID__

Defined only in compilers that support cross compiling with an Android product as the target platform:

__APPLE__

Defined only in compilers that support cross compiling with an Apple product as the target platform:

__arm__

Defined only in compilers that support cross compiling for the ARM compiler architecture:

__BCOPT__

1

Defined only in compilers that support optimization, therefore always defined.

__BCPLUSPLUS__

Values are listed in C++ Compiler Versions in this topic.

Defined if you've selected C++ compilation; will increase in later releases.

__BOOL__

1

Indicates that the bool keyword is accepted.

__BORLANDC__

Values are listed in C++ Compiler Versions in this topic.

Version number.

__CDECL__

1

Defined if Calling Convention is set to cdecl; otherwise undefined.

_CHAR_UNSIGNED

1

Undefined by default. Using the -K switch to make the default character unsigned causes this macro to be defined. Ultimately, the -K option controls how a char is extended when converted to an int. By default, the compiler sign-extends, but if you enable _CHAR_UNSIGNED_, then the compiler zero-extends characters when converting to int.

__clang__

1

Defined if a Clang-based C++ compiler is in use.

See Clang Builtin Macros.

__CODEGEARC__

Values are listed in C++ Compiler Versions and in this topic.

Version number.

__CODEGEARC_VERSION__

  • Major version number is bits 31..24
  • Minor version number is bits 23..16
  • Internal version number is bits 15..0

This internal macro expands to an integer that encodes the compiler's major version, minor version, and an internal number. See Example of __CODEGEARC_VERSION__ Macro.

__CODEGUARD__

Defined whenever one of the CodeGuard compiler options is used; otherwise it is undefined.

__CONSOLE__

1

When defined, the macro indicates that the program is a console application.

_CPPUNWIND

1

Enable stack unwinding. This is true by default; use -xd-!ALink(OSCGExceptions1) to disable.

__cplusplus

1

Defined if in C++ mode; otherwise, undefined.

__DATE__

String literal

Date when processing began on the current file.

__DLL__

1

Defined whenever the -WD compiler option is used; otherwise it is undefined.

__FILE__

String literal

Name of the current file being processed.

__FLAT__

1

Defined when compiling in 32-bit flat memory model.

__FUNC__ or __FUNCTION__

String literal

Name of the current function being processed. More details.

__LINE__

Decimal constant

Number of the current source file line being processed.

__MACH__

Defined only in compilers that support cross compiling with a target of MAC OSX.

_M_IX86

0x12c

Always defined. The default value is 300. You can change the value to 400 or 500 by using the /4 or /5 compiler options.

__MT__

1

Defined only if the -tWM option is used. It specifies that the multithread library is to be linked.

__PASCAL__

1

Defined if Calling Convention is set to Pascal; otherwise undefined.

_PUSHPOP_SUPPORTED

1

Always defined; allows Microsoft standard headers to use push and pop to verify whether a feature is supported.

_STDCALL_SUPPORTED

1

Always defined; defines the Microsoft stdcall calling convention.

__STDC__

1

Defined if you compile with the -A compiler option; otherwise, it is undefined.

__TCPLUSPLUS__

Values are listed in C++ Compiler Versions in this topic.

Version number.

__TEMPLATES__

1

Defined as 1 for C++ files (meaning that templates are supported); otherwise, it is undefined.

__TIME__

String literal

Time when processing began on the current file.

__TLS__

1

Thread Local Storage. Always true.

__TURBOC__

Values are listed in C++ Compiler Versions and in this topic.

Will increase in later releases.

_UNICODE and UNICODE

Defined for C++ programs that use the VCL.

_WCHAR_T

Defined only for C++ programs to indicate that wchar_t is an intrinsically defined data type.

_WCHAR_T_DEFINED

Defined only for C++ programs to indicate that wchar_t is an intrinsically defined data type.

_Windows

1

Defined when compiling on the Windows platform.

__WIN32__

1

Defined for console and GUI applications on the 32-bit Windows platform.

_WIN64

1

Defined for console and GUI applications on the 64-bit Windows platform.

Note: The predefined macros __DATE__, __FILE__ , __FUNC__, __LINE__, __STDC__, and __TIME__ cannot be redefined or undefined.

C++ Compiler Versions in Predefined Macros

The macros defined for the C++ compiler (such as __CODEGEARC__) have the following version numbers:

  • 0x0570 for BDS 2006.
  • 0x0590 for C++Builder 2007.
  • 0x0591 for update 1 to C++Builder 2007.
  • 0x0592 for RAD Studio 2007.
  • 0x0593 for the December update to RAD Studio 2007.
  • 0x0610 for C++Builder 2009 and for C++Builder 2009 Update 1.
  • 0x0620 for C++Builder 2010 and for C++Builder 2010 Update 1.
  • 0x0621 for C++Builder 2010 Update 2.
  • 0x0630 for C++Builder XE.
  • 0x0631 for C++Builder XE Update 1.
  • 0x0640 for C++Builder XE2.
  • 0x0650 for C++Builder XE3 and XE3 Update 1.
  • 0x0651 for January 2013 update (BCC32 and BCCOSX); BCC64 remained at 0x0650.
  • 0x0660 for C++Builder XE4 (BCC32 and BCCOSX); BCC64 remained at 0x0650.
  • 0x0670 for C++Builder XE5 (BCC32, BCC64, BCCOSX, and BCCIOSARM).
  • 0x0680 for C++Builder XE6 (BCC32, BCC64, BCCOSX, BCCIOSARM, and BCCAARM).
  • 0x0690 for C++Builder XE7 (BCC32, BCC64, BCCOSX, BCCIOSARM, and BCCAARM).

See also Compiler Versions.

Macros Defined Elsewhere

The following macros are defined for backwards-compatibility when you #include System.hpp:

Macro Value Description

ANSISTRING_AS_TEMPLATE

AnsiString type is defined as a template class, AnsiString<T>.

_STRINGCHECKS_OFF
(no longer supported)

In past releases, C++ programs expected the Delphi compiler to not set the STRINGCHECKS directive. The Delphi compiler no longer supports the STRINGCHECKS directive, so the related _STRINGCHECKS_OFF C++ macro is unnecessary and is no longer set. Therefore if you are migrating pre-2009 code to the current version, you need to update the event-handler signature (because a pre-2009 event handler expects AnsiString, while the run time now sends UnicodeString). See Unicode in RAD Studio.

See Also

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