Developer Guide and Reference

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Precompiled Header Support

There are some differences in how precompiled header (PCH) files are supported between the Intel® C++ Compiler and the Microsoft* Visual C++* compiler. These differences include the following:
  • The PCH information generated by the Intel® C++ Compiler is not compatible with the PCH information generated by the Microsoft* Visual Studio* compiler.
  • The Intel® C++ Compiler does not support PCH generation and use in the same translation unit.
  • The Intel® C++ Compiler does not generate PCH information beyond a point where a declaration is seen in the primary translation unit. When the
    /Yu
    option is specified, the Microsoft* Visual C++* compiler ignores all text, including declarations preceding the
    #include
    statement of the specified file.
  • The Microsoft* Visual C++* Compiler will not emit an error if a function or variable definition occurs in a PCH file which is included in two different source files and is not referenced. The Intel® C++ Compiler will always give a multiple definition link error under these circumstances.

Product and Performance Information

1

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804