Developer Guide and Reference

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Use Predefined Macros for Intel® Compilers

This topic describes macros that affect the various Intel® Compilers.
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
The Intel® DPC++ Compiler and Intel® C++ Compiler documentation is combined into a single Developer Guide and Reference, which can be found on the Intel Developer Zone.

Different Compilers and Drivers

The table below provides the different compiler front-end and driver information.
Compiler
Notes
Linux* Driver
Windows* Driver
Intel® DPC++ Compiler
A C++ and Khronos SYCL* compiler with a Clang front-end
dpcpp
dpcpp.exe
Intel® C++ Compiler
A C++ compiler with a Clang front-end, supporting OpenMP* offload
icx
for C
icpx
for C++
icx.exe
Intel® C++ Compiler Classic
A C++ compiler with EDG front-end, supporting OpenMP* but not OpenMP offload
icc
for C
icpc
for C++
icl.exe

Predefined Macros for Each Compiler

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.
Intel® C++ Compiler Classic
  • __INTEL_COMPILER
  • __INTEL_COMPILER_BUILD_DATE
__INTEL_COMPILER
is used to select the compiler.
__INTEL_COMPILER_BUILD_DATE
is used to select the compiler build.

Predefined Macros for Intel® DPC++ Compiler

See the example below using
#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

See the example below using
#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

Predefined Macros for Intel® C++ Compiler Classic

See the example below using
#if defined(__INTEL_COMPILER)
to define a code block specific to the Intel® C++ Compiler Classic:
// icc/icpc classic only #if defined(__INTEL_COMPILER) // code specific for Intel C++ Compiler Classic below // ... ... // example only std::cout << "__INTEL_COMPILER_BUILD_DATE: " << __INTEL_COMPILER_BUILD_DATE << std::endl; std::cout << "__INTEL_COMPILER: " << __INTEL_COMPILER << std::endl; std::cout << "__VERSION__: " << __VERSION__ << std::endl; #endif
Example output using the Intel® oneAPI Toolkit Gold release with an Intel C++ Compiler Classic patch release of 2021.1.2:
Windows
Linux
__INTEL_COMPILER_BUILD_DATE: 20201208 __INTEL_COMPILER: 202110
__INTEL_COMPILER_BUILD_DATE: 20201208 __INTEL_COMPILER: 2021 __VERSION__: Intel(R) C++ g++ 7.5 mode

Product and Performance Information

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