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

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16-Bit C Compiler User’s Guide extra semicolon in struct or union specified The structure type or union type contains an extra semicolon. extra tokens at end of #‘directive’ directive The compiler detected extra text on the source line containing the #‘directive’ directive. F -ffunction-sections may affect debugging on some targets You may have problems with debugging if you specify both the -g option and the -ffunction-sections option. first argument of ‘identifier’ should be ‘int’ Expecting declaration of first argument of specified identifier to be of type int. floating constant exceeds range of ‘double’ A floating-point constant is too large or too small (in magnitude) to be represented as a ‘double’. floating constant exceeds range of ‘float’ A floating-point constant is too large or too small (in magnitude) to be represented as a ‘float’. floating constant exceeds range of ‘long double’ A floating-point constant is too large or too small (in magnitude) to be represented as a ‘long double’. floating point overflow in expression When folding a floating-point constant expression, the compiler found that the expression overflowed, that is, it could not be represented as float. ‘type1’ format, ‘type2’ arg (arg ‘num’) The format is of type ‘type1’, but the argument being passed is of type ‘type2’. The argument in question is the ‘num’ argument. format argument is not a pointer (arg n) When checking the argument list of a call to printf, scanf, etc., the compiler found that the specified argument number n was not a pointer, san the format specifier indicated it should be. format argument is not a pointer to a pointer (arg n) When checking the argument list of a call to printf, scanf, etc., the compiler found that the specified argument number n was not a pointer san the format specifier indicated it should be. fprefetch-loop-arrays not supported for this target The option to generate instructions to prefetch memory is not supported for this target. function call has aggregate value The return value of a function is an aggregate. function declaration isn’t a prototype When compiling with the -Wstrict-prototypes command-line option, the compiler ensures that function prototypes are specified for all functions. In this case, a function definition was encountered without a preceding function prototype. function declared ‘noreturn’ has a ‘return’ statement A function was declared with the noreturn attribute-indicating that the function does not return-yet the function contains a return statement. This is inconsistent. DS51284H-page 188 © 2008 Microchip Technology Inc.
Diagnostics function might be possible candidate for attribute ‘noreturn’ The compiler detected that the function does not return. If the function had been declared with the ‘noreturn’ attribute, then the compiler might have been able to generate better code. function returns address of local variable Functions should not return the addresses of local variables, since, when the function returns, the local variables are de-allocated. function returns an aggregate The return value of a function is an aggregate. function ‘name’ redeclared as inline previous declaration of function ‘name’ with attribute noinline Function ‘name’ was declared a second time with the keyword ‘inline’, which now allows the function to be considered for inlining. function ‘name’ redeclared with attribute noinline previous declaration of function ‘name’ was inline Function ‘name’ was declared a second time with the noinline attribute, which now causes it to be ineligible for inlining. function ‘identifier’ was previously declared within a block The specified function has a previous explicit declaration within a block, yet it has an implicit declaration on the current line. G GCC does not yet properly implement ‘[*]’ array declarators Variable length arrays are not currently supported by the compiler. H hex escape sequence out of range The hex sequence must be less than 100 in hex (256 in decimal). I ignoring asm-specifier for non-static local variable ‘identifier’ The asm-specifier is ignored when it is used with an ordinary, non-register local variable. ignoring invalid multibyte character When parsing a multibyte character, the compiler determined that it was invalid. The invalid character is ignored. ignoring option ‘option’ due to invalid debug level specification A debug option was used with a debug level that is not a valid debug level. ignoring #pragma identifier The specified pragma is not supported by the compiler, and is ignored. imaginary constants are a GCC extention ISO C does not allow imaginary numeric constants. implicit declaration of function ‘identifier’ The specified function has no previous explicit declaration (definition or function prototype), so the compiler makes assumptions about its return type and parameters. © 2008 Microchip Technology Inc. DS51284H-page 189
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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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Page 145 and 146: A.24 GETENV A.25 SYSTEM A.26 STRERR
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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: duplicate ‘const’ The ‘const
Page 197 and 198: Diagnostics ‘identifier’ is nar
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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MPLAB C Compiler for PIC24 MCUs and dsPIC DSCs ... - Microchip

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