Microsoft KB Archive/26588

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PRB: C2106 Using FP_SEG and FP_OFF, Header File Missing

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Q26588

5.00 5.10 6.00 6.00a 6.00ax 7.00 | 5.00 5.10 6.00 6.00a | 1.00 1.50 MS-DOS | OS/2 | WINDOWS kbtool kbprb -- The information in this article applies to: - Microsoft C for MS-DOS, versions 5.0, 5.1, 6.0, 6.0a, and 6.0ax - Microsoft C for OS/2, versions 5.0, 5.1, 6.0, and 6.0a - Microsoft C/C++ for MS-DOS, version 7.0 - Microsoft Visual C++ for Windows, versions 1.0 and 1.5 -- SYMPTOMS ======== An attempt to use the FP_SEG or FP_OFF macros fails and the compiler generates: error C2106: ' = ' : left operand must be l-value CAUSE ===== The application uses _FP_SEG or _FP_OFF as an l-value, but does not #include the DOS.H header file. When the source code does not include the DOS.H header file, the compiler treats FP_SEG and FP_OFF as function calls instead of macro definitions. The C2106 error occurs because a function is not an lvalue. RESOLUTION ========== Modify the source code to #include the DOS.H header file Additional reference words: 1.00 1.50 6.00 6.00a 6.00ax 7.00 8.00 8.00c KBCategory: kbtool kbprb KBSubcategory: CLIss

Keywords : kb16bitonly

Issue type :

Technology : kbVCsearch kbAudDeveloper kbPTProdChange kbvc150 kbvc100 kbCCompSearch kbZNotKeyword3 kbCComp510DOS kbCComp600DOS kbCComp600aDOS kbCComp600axDOS kbCComp510OS2 kbCComp600OS2 kbCComp600aOS2 kbCVC700DOS