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µVision3 User's Guide

µVision3 Overview User Interface Creating Applications Utilities Debugging Debug Commands Debug Functions Simulation Flash Programming Dialogs File Device Database License Management Single-User License Floating-User License Floating License Administrator Edit Find in Files Configuration Editor Colors & Fonts User Keywords Shortcut Keys Templates View Symbol Window Project Components, Enviornment, and Books Project Components Folders/Extensions Books Multi-Project Select Device Options Device Properties Target Target (Keil ARM) Target (Keil C51) Target (Keil C166) Target (Keil C251) Target (GNU ARM) Target (RealView ARM) Output Output (Keil) Output (GNU ARM) Output (RealView ARM) Listing Listing (Keil) Listing (GNU ARM) Listing (RealView ARM) User Keil EC++ Compiler Compiler Keil CA ARM Compiler Keil Cx51 Compiler Keil C166 Compiler Keil C251 Compiler GNU ARM C Compiler RealView ARM C Compiler Assembler Keil AA ARM Assembler Keil Ax51 Assembler Keil A166 Assembler Keil A251 Assembler GNU ARM Assembler RealView ARM Assembler Linker Keil LA Locate Keil LA Misc Keil BL51 Locate Keil BL51 Misc Keil Lx51 Locate Keil Lx51 Misc Keil L166 Locate Keil L166 Misc GNU ARM Linker RealView ARM Linker Debug Utilities Batch Build Debug Breakpoints Debug Settings Logic Analyzer Memory Map Performance Analyzer Function Editor Tools Setup PC-Lint Customize Tools Menu SVCS Configure Version Control Example Programs Command Line Appendix

Compiler

Preprocessor Symbols

Define
Sets preprocessor symbols which may be checked with #if, #ifdef and #ifndef. The defined names are copied exactly as they are entered (case-sensitive). Each name may get optionally a value. Define: Check, NoExtRam, X1=1+5 is identical to the following C preprocessor #define statements:
#define Check
#define NoExtRam
   #define X1 1+5
Undefine
Clears previous Define assignments that are entered in the options dialog of a higher Target or Group level.

Code Optimization

Level
Set the optimization level the Compiler uses when generating object code.
Emphasis
Specify whether the Compiler should optimize for code size or execution speed.
Alias Checking on Pointer Accesses
Select this check box to force the compiler to reload registers holding variables that have aliases (usually through pointers). When this check box is clear, the compiler reuses register contents even though a pointer or a other alias may have changed the variable.

Other Controls

Use Thumb Mode
Generate Thumb instructions for the C code in this module.
Warnings
Lets you suppress compiler warnings.
Treat plain 'char' as 'unsigned char'
Instructs the Compiler to treat all variables declared with plain char as unsigned char variables.
Include Paths
Allows you to supply one or more (separated by semi-colon) paths to search for header files. For #include "filename.h" the Compiler searches first the current folder and then folder of the source file. When this fails or when #include <filename.h> is used, the paths specified in the include paths box are searched. When this still fails, the paths specified in for the INC folder under Project — Components, Environment, Books ... are used.
Misc Controls
Specify any directive for which there is no individual dialog control.
Compiler Control String
Displays the current directives at the Compiler command line.
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