User and Reference Guide for the Intel® C++ Compiler 14.0
The following topic applies to Xcode*.
GCC* is the default Xcode* compiler for C, C++, and Objective-C.
To select the Intel® C++ Compiler for C or C++:
Select the target you want to change and click Build Rules.
Add a new rule by clicking Add Build Rule in the lower-right corner of the project editor.
Under Process, choose C source files or C++ source files , depending on the source files.
Under Using, select Intel® C++ Compiler XE 14.0.
If you select a tool that does not support the source file type, that source file type will be processed by a later rule that specifies that type. For example, even though Objective-C/C++ sources are derived from C sources, they will actually be built by GCC instead of the Intel® C++ Compiler.