Determining the Memory Model for Conditional Compilation |
Q44386
6.00 6.00a 6.00ax 7.00 | 6.00 6.00a | 1.00 1.50 MS-DOS | OS/2 | WINDOWS kbtool ---------------------------------------------------------------------- The information in this article applies to: The Microsoft C/C++ Compiler (CL.EXE) included with: - Microsoft C for MS-DOS, versions 6.0, 6.0a, and 6.0ax - Microsoft C for OS/2, versions 6.0, and 6.0a - Microsoft C/C++ for MS-DOS, versions 7.0 - Microsoft Visual C++ for Windows, versions 1.0 and 1.5 ---------------------------------------------------------------------- SUMMARY ======= There is a predefined identifier that can be used to allow the preprocessor to determine which memory model has been chosen for the current compilation. The identifier is M_I86?M, where "?" is an identifier for one of the following five memory models: S = Small M = Medium L = Large C = Compact H = Huge This identifier can be used with a preprocessor command to produce conditional compilation dependent upon the memory model. An example of its use is shown below. Sample Code ----------- /* Compile options needed: none */ /* * * This example demonstrates how to use the C compiler M_I86?M values. * It also shows other various preprocessor components. The memory * model is displayed using the message() pragma. If the memory model * is not recognized by the program, the compilation terminates using * the #error preprocessor directive. The identifier _MEMORY_MODEL_ * has been chosen arbitrarily, and has no special value to the C * compiler. * */ #include #if defined (M_I86CM) #define _MEMORY_MODEL_ "compact" #elif defined (M_I86SM) #define _MEMORY_MODEL_ "small" #elif defined (M_I86MM) #define _MEMORY_MODEL_ "medium" #elif defined (M_I86HM) #define _MEMORY_MODEL_ "huge" #elif defined (M_I86LM) #define _MEMORY_MODEL_ "large" #else #error "ERROR: unknown memory model!!" #define _MEMORY_MODEL_ "**UNKNOWN**" #endif #pragma message ("Using the " _MEMORY_MODEL_ " memory model...") void main(void); void main(void) { printf("hello, world\n"); } Additional reference words: kbinf 1.00 1.50 6.00 6.00a 6.00ax 7.00 8.00 8.00c KBCategory: kbtool KBSubcategory: CLIss
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Technology : kbVCsearch kbAudDeveloper kbCVCComp
Last Reviewed: May 5, 2001 |
