MPLAB C Compiler for PIC24 MCUs and dsPIC DSCs ... - Microchip

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16-Bit C Compiler User’s Guide increment of read-only member ‘name’ The member ‘name’ was declared as const and cannot be modified by incrementing. increment of read-only variable ‘name’ ‘name’ was declared as const and cannot be modified by incrementing. initialization of a flexible array member A flexible array member is intended to be dynamically allocated not statically. ‘identifier’ initialized and declared ‘extern’ Externs should not be initialized. initializer element is not constant Initializer elements should be constant. inline function ‘name’ given attribute noinline The function ‘name’ has been declared as inline, but the noinline attribute prevents the function from being considered for inlining. inlining failed in call to ‘identifier’ called from here The compiler was unable to inline the call to the specified function. integer constant is so large that it is unsigned An integer constant value appears in the source code without an explicit unsigned modifier, yet the number cannot be represented as a signed int; therefore, the compiler automatically treats it as an unsigned int. integer constant is too large for ‘type’ type An integer constant should not exceed 2^32 - 1 for an unsigned long int, 2^63 - 1 for a long long int or 2^64 - 1 for an unsigned long long int. integer overflow in expression When folding an integer constant expression, the compiler found that the expression overflowed; that is, it could not be represented as an int. invalid application of ‘sizeof’ to a function type It is not recommended to apply the sizeof operator to a function type. invalid application of ‘sizeof’ to a void type The sizeof operator should not be applied to a void type. invalid digit ‘digit’ in octal constant All digits must be within the radix being used. For instance, only the digits 0 thru 7 may be used for the octal radix. invalid second arg to __builtin_prefetch; using zero Second argument must be 0 or 1. invalid storage class for function ‘name’ ‘auto’ storage class should not be used on a function defined at the top level. ‘static’ storage class should not be used if the function is not defined at the top level. invalid third arg to __builtin_prefetch; using zero Third argument must be 0, 1, 2, or 3. ‘identifier’ is an unrecognized format function type The specified identifier, used with the format attribute, is not one of the recognized format function types printf, scanf, or strftime. DS51284H-page 190 © 2008 Microchip Technology Inc.
Diagnostics ‘identifier’ is narrower than values of its type A bit-field member of a structure has for its type an enumeration, but the width of the field is insufficient to represent all enumeration values. ‘storage class’ is not at beginning of declaration The specified storage class is not at the beginning of the declaration. Storage classes are required to come first in declarations. ISO C does not allow extra ‘;’ outside of a function An extra ‘;’ was found outside a function. This is not allowed by ISO C. ISO C does not support ‘++’ and ‘--’ on complex types The increment operator and the decrement operator are not supported on complex types in ISO C. ISO C does not support ‘~’ for complex conjugation The bitwise negation operator cannot be use for complex conjugation in ISO C. ISO C does not support complex integer types Complex integer types, such as __complex__ short int, are not supported in ISO C. ISO C does not support plain ‘complex’ meaning ‘double complex’ Using __complex__ without another modifier is equivalent to ‘complex double’ which is not supported in ISO C. ISO C does not support the ‘char’ ‘kind of format’ format ISO C does not support the specification character ‘char’ for the specified ‘kind of format’. ISO C doesn’t support unnamed structs/unions All structures and/or unions must be named in ISO C. ISO C forbids an empty source file The file contains no functions or data. This is not allowed in ISO C. ISO C forbids empty initializer braces ISO C expects initializer values inside the braces. ISO C forbids nested functions A function has been defined inside another function. ISO C forbids omitting the middle term of a ?: expression The conditional expression requires the middle term or expression between the ‘?’ and the ‘:’. ISO C forbids qualified void function return type A qualifier may not be used with a void function return type. ISO C forbids range expressions in switch statements Specifying a range of consecutive values in a single case label is not allowed in ISO C. ISO C forbids subscripting ‘register’ array Subscripting a ‘register’ array is not allowed in ISO C. ISO C forbids taking the address of a label Taking the address of a label is not allowed in ISO C. ISO C forbids zero-size array ‘name’ The array size of ‘name’ must be larger than zero. © 2008 Microchip Technology Inc. DS51284H-page 191
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MPLAB ® C COMPILER FOR PIC24 MCUs
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Table of Contents A.5 Identifiers .
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INTRODUCTION MPLAB ® C COMPILER FO
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CONVENTIONS USED IN THIS GUIDE The
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THE MICROCHIP WEB SITE Preface C Re
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1.1 INTRODUCTION 1.2 HIGHLIGHTS MPL
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1.5 COMPILER FEATURE SET Compiler O
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Differences Between 16-Bit Device C
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Using the Compiler on the Command L
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3.6 ENVIRONMENT VARIABLES Using the
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4.1 INTRODUCTION 4.2 HIGHLIGHTS 4.3
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4.5 MEMORY SPACES Run Time Environm
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Run Time Environment 1. It is possi
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4.8 SOFTWARE STACK Run Time Environ
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FIGURE 4-2: CALL OR RCALL Stack gro
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4.11 FUNCTION CALL CONVENTIONS Run
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Run Time Environment The compiler a
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4.14.2 String Literals as Arguments
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6.1 INTRODUCTION MPLAB ® C COMPILE
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6.3 PMP POINTERS Additional C Point
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6.4 EXTERNAL POINTERS 6.3.3 Define
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ead_external16 Additional C Pointer
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Additional C Pointer Types } else {
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7.5 USING SFRS Device Support Files
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7.6 USING MACROS Device Support Fil
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EXAMPLE 7-2: EEDATA ACCESS VIA PSV
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Interrupts When using the interrupt
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8.4.1 dsPIC30F DSCs (Non-SMPS) Inte
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8.4.3 PIC24F MCUs Interrupt Vectors
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Interrupts TABLE 8-3: INTERRUPT VEC
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Interrupts TABLE 8-4: INTERRUPT VEC
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85 _Interrupt85 _AltInterrupt85 Res
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8.8 ENABLING/DISABLING INTERRUPTS I
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Interrupts 2. Unsafe: read bar inte
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LATGbits.LATG2 = 0; /* No problem l
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Mixing Assembly Language and C Modu
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A.5 IDENTIFIERS A.6 CHARACTERS Impl
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Implementation-Defined Behavior The
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A.15 PREPROCESSING DIRECTIVES Imple
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A.17 SIGNALS A.18 STREAMS AND FILES
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Page 149 and 150: __builtin_btg Built-in Functions De
Page 151 and 152: __builtin_clr_prefetch Argument: xp
Page 153 and 154: __builtin_dmaoffset Built-in Functi
Page 155 and 156: __builtin_fbcl Built-in Functions A
Page 157 and 158: __builtin_modsd Argument: dividend
Page 159 and 160: __builtin_mpy Error Messages An err
Page 161 and 162: __builtin_mulss Built-in Functions
Page 163 and 164: __builtin_psvoffset Built-in Functi
Page 165 and 166: __builtin_subab Built-in Functions
Page 167 and 168: __builtin_tblwth Built-in Functions
Page 169 and 170: C.1 INTRODUCTION C.2 ERRORS MPLAB
Page 171 and 172: Diagnostics ambiguous abbreviation
Page 173 and 174: Diagnostics cast specifies function
Page 175 and 176: F Diagnostics ‘identifier’ fail
Page 177 and 178: Diagnostics initializer for static
Page 179 and 180: Diagnostics invalid use of undefine
Page 181 and 182: N Diagnostics negative width in bit
Page 183 and 184: R Diagnostics redeclaration of ‘i
Page 185 and 186: Diagnostics symbol ‘symbol’ not
Page 187 and 188: Diagnostics void expression between
Page 189 and 190: Diagnostics anonymous union declare
Page 191 and 192: Diagnostics comparison between sign
Page 193 and 194: duplicate ‘const’ The ‘const
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Page 199 and 200: Diagnostics library function ‘ide
Page 201 and 202: P Diagnostics parameter has incompl
Page 203 and 204: Diagnostics shift count >= width of
Page 205 and 206: Diagnostics too many arguments for
Page 207 and 208: V Diagnostics __VA_ARGS__ can only
Page 209 and 210: MPLAB ® C COMPILER FOR PIC24 MCUs
Page 211 and 212: MPLAB C Compiler for PIC18 MCUs vs.
Page 217 and 218: E.1 INTRODUCTION E.2 HIGHLIGHTS MPL
Page 221 and 222: G.1 PREAMBLE MPLAB ® C COMPILER FO
Page 223 and 224: G.3 VERBATIM COPYING G.4 COPYING IN
Page 225 and 226: GNU Free Documentation License incl
Page 229 and 230: Glossary File Registers On-chip dat
Page 231 and 232: Glossary Machine Language A set of
Page 233 and 234: Glossary Stack, Software Memory use
Page 235 and 236: Symbols __builtin_add..............
Page 237 and 238: -fpack-struct .....................
Page 239 and 240: -idirafter.........................
Page 241 and 242: Peephole Optimization..............
Page 243 and 244: -Wsequence-point...................
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