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BCCIOSARM64 is the RAD Studio C++ compiler for 64-bit iOS.

BCCIOSARM64 is based on Clang 3.3.1. See Clang-enhanced C++ Compilers for information that the BCCIOSARM64 compiler has in common with other Clang-enhanced C++ compilers.

  • BCCIOSARM64 does not support the iOS Simulator. The iOS Simulator runs a special, non-ARM version of iOS. RAD Studio does not provide any C++ compiler for the iOS Simulator.
  • For 32-bit iOS, use BCCIOSARM instead.

General Information

Field Value
Calling Conventions


Name Mangling Itanium (with small differences)
Standard Library LLVM libc++

Output Files

File Type File Extension File Format
Executable Mach-O
Shared Library N/A¹
Static Library .a ar
Compiled Object .o Mach-O
Note: iOS does not support applications containing shared libraries.

Writing C++ Code for BCCIOSARM64

To write C++ code specifically for BCCIOSARM64, use:

#if defined(__APPLE__) && defined(__arm64__)
    // Your code.
Note: This is compiler-specific code, and it is not the recommended way to write iOS-specific code. See Creating an iOS App, Writing Code for iOS Only.

For more information, see Clang-enhanced C++ Compilers, Predefined Macros.

Implementation of Some Data Types in BCCIOSARM64

The 64-bit runtime environment on iOS changes the sizes of many built-in data types. This section explains how to use the following Delphi data in C++ codes for 64-bit iOS devices:


On iOS64 platform, the Delphi type NativeInt is implemented via the long type. This might affect the codes that involve constants. To avoid ambiguity, the code must use the L-suffix as shown in the following code snippet:

NativeInt ni;
#if defined(_PLAT_IOS64)
  if (ni == 99L)
  if (ni == 99)

Note: In the code snippet above, the code that does not use the L-suffix would be ambiguous for iOS64 platform.


In Delphi codes, the TypeInfo function returns a pointer to the RTTI (Run-time Type Information) block that describes a given type. However, this function is not available in C++Builder. In C++ codes you should use the __delphirtti keyword instead.

On iOS64, for a long type, the TypeInfo function returns a typeinfo of the System::tkInt64 kind. At the same time, on other platforms, it returns a typeinfo of the System::tkInteger kind. To clarify, consider the following code snippet:

System::Typinfo::PTypeInfo ti;
    ti = __delphirtti(long);
#if defined(_PLAT_IOS64)
    assert(ti->Kind == System::tkInt64);
    assert(pData->MinInt64Value == -9223372036854775808L);
    assert(pData->MaxInt64Value == 9223372036854775807L);
    assert(ti->Kind == System::tkInteger);
    assert(pData->OrdType == System::Typinfo::otSLong);
    assert(pData->MinValue == -2147483648);
    assert(pData->MaxValue == 2147483647);

The Typeinfo differences mentioned above can cause an incompatibility between iOS64 client code interacting with a Server. For example, when you send a long via SOAP, the iOS64 platform will serialize it as an xml long while other platforms will serialize it as a xml int.

For example, the following table shows the XML produced when a long is sent from a Win32 and an iOS64 client:

iOS64   WIN32  
<V xsi:type="xsd:long">-1000</V> <V xsi:type="xsd:int">-1000</V>

Most runtime environments will transparently convert the XML back to the appropriate type upon deserialization. However, due to the differences in the range of an xml:long vs an xml:int, an iOS64 client could send a value that is truncated by a WIN32 receiver.

See Also

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