Intel® oneAPI DPC++/C++ Compiler Developer Guide and Reference

Development Reference Guides

Contents

Use Predefined Macros to Specify Intel® Compilers

This topic shows how to use predefined macros to specify an Intel® compiler or version of an Intel compiler.

Predefined Macros to Specify Compiler and Version

When you install both the Intel® oneAPI Base Toolkit (Base Kit) and the Intel® oneAPI HPC Toolkit (HPC Kit), you will notice that there are three compilers installed:
  • Intel® DPC++ Compiler
  • Intel® C++ Compiler
  • Intel® C++ Compiler Classic
You can use the following predefined macros to invoke a specific compiler or version of a compiler:
Compiler
Predefined Macros to Differentiate from Other Compiler
Notes
Intel® DPC++ Compiler
  • SYCL_LANGUAGE_VERSION
  • __INTEL_LLVM_COMPILER
  • __VERSION
SYCL_LANGUAGE_VERSION
 is defined in SYCL* spec and should be defined by all SYCL compilers.
__INTEL_LLVM_COMPILER
 is used to select the compiler.
Intel® C++ Compiler
  • __INTEL_LLVM_COMPILER
  • __VERSION
__INTEL_LLVM_COMPILER
 is used to select the compiler.
__VERSION
 is used to select the compiler version.

Predefined Macros for Intel® DPC++ Compiler

The following example uses
#if defined(SYCL_LANGUAGE_VERSION) && defined (__INTEL_LLVM_COMPILER)
 to define a code block specific to the Intel® DPC++ Compiler: 
// dpcpp only
#if defined(SYCL_LANGUAGE_VERSION) && defined (__INTEL_LLVM_COMPILER)
   // code specific for DPC++ compiler below
   // ... ...

   // example only
   std::cout << "SYCL_LANGUAGE_VERSION: " << SYCL_LANGUAGE_VERSION << std::endl;
   std::cout << "__INTEL_LLVM_COMPILER: " << __INTEL_LLVM_COMPILER << std::endl;
   std::cout << "__VERSION__: " << __VERSION__ << std::endl;
#endif
Example output using the Intel® oneAPI Toolkit Gold release with an Intel DPC++ Compiler patch release of 2021.1.2:
Windows
Linux 
SYCL_LANGUAGE_VERSION: 202001

__INTEL_LLVM_COMPILER: 202110

__VERSION__: Intel(R) Clang Based C++, clang 12.0.0
SYCL_LANGUAGE_VERSION: 202001

__INTEL_LLVM_COMPILER: 202110

__VERSION__: Intel(R) Clang Based C++, gcc 4.2.1 mode

Predefined Macros for Intel® C++ Compiler

The following example uses
#if !defined(SYCL_LANGUAGE_VERSION) && defined (__INTEL_LLVM_COMPILER)
 to define a code block specific to the Intel® C++ Compiler: 
// icx only
#if !defined(SYCL_LANGUAGE_VERSION) && defined (__INTEL_LLVM_COMPILER)
   // code specific for Intel C++ Compiler below
   // ... ...

   // example only
   std::cout << "__INTEL_LLVM_COMPILER: " << __INTEL_LLVM_COMPILER << std::endl;
   std::cout << "__VERSION__: " << __VERSION__ << std::endl;
#endif
Example output using the Intel® oneAPI Toolkit Gold release with an Intel C++ Compiler patch release of 2021.1.2:
Windows
Linux 
__INTEL_LLVM_COMPILER: 202110

__VERSION__: Intel(R) Clang Based C++, clang 12.0.0
__INTEL_LLVM_COMPILER: 202110

__VERSION__: Intel(R) Clang Based C++, gcc 4.2.1 mode

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.