Microsoft KB Archive/37233

= INFO: Why System Include Files Prototype Functions as _cdecl =

Article ID: 37233

Article Last Modified on 7/5/2005

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APPLIES TO


 * Microsoft C Professional Development System 6.0a
 * Microsoft Visual C++ 1.0 Professional Edition
 * Microsoft Visual C++ 1.5 Professional Edition
 * Microsoft Visual C++ 1.51
 * Microsoft Visual C++ 1.52 Professional Edition
 * Microsoft Visual C++ 2.0 Professional Edition
 * Microsoft Visual C++ 2.1
 * Microsoft Visual C++ 4.0 Standard Edition
 * Microsoft Visual C++ 5.0 Enterprise Edition
 * Microsoft Visual C++ 6.0 Enterprise Edition
 * Microsoft Visual C++ 5.0 Professional Edition
 * Microsoft Visual C++ 6.0 Professional Edition
 * Microsoft Visual C++ 6.0 Standard Edition

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This article was previously published under Q37233





SUMMARY
The system include files declare functions that use the C calling and naming conventions with the attribute &quot;cdecl&quot;.

The compiler uses the C calling and naming conventions by default unless the compiler command line specifies the /Gc or /Gz option switches. The /Gc switch instructs the compiler to use the Pascal (FORTRAN) calling convention by default. The 32-bit compilers do not support the /Gc option switch; they use the /Gz option switch that instructs the compiler to use the __stdcall calling and naming convention by default.

The &quot;cdecl&quot; attribute instructs the compiler to generate run-time library calls using the C calling and naming conventions even when the command line specifies the /Gc or /Gz option.

Keywords: kbinfo kblangc KB37233

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