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

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16-Bit C Compiler User’s Guide union defined inside parms A union is defined inside a function parameter list. union has no members The union is empty, it has no members. unknown conversion type character ‘character’ in format When checking the argument list of a call to printf, scanf, etc., the compiler found that one of the conversion characters in the format string was invalid (unrecognized). unknown conversion type character 0xnumber in format When checking the argument list of a call to printf, scanf, etc., the compiler found that one of the conversion characters in the format string was invalid (unrecognized). unknown escape sequence ‘sequence’ ‘sequence’ is not a valid escape code. An escape code must start with a ‘\’ and use one of the following characters: n, t, b, r, f, b, \, ', ", a, or ?, or it must be a numeric sequence in octal or hex. In octal, the numeric sequence must be less than 400 octal. In hex, the numeric sequence must start with an ‘x’ and be less than 100 hex. unnamed struct/union that defines no instances struct/union is empty and has no name. unreachable code at beginning of identifier There is unreachable code at beginning of the specified function. unrecognized gcc debugging option: char The ‘char’ is not a valid letter for the -dletters debugging option. unused parameter ‘identifier’ The specified function parameter is not used in the function. unused variable ‘name’ The specified variable was declared but not used. use of ‘*’ and ‘flag’ together in format When checking the argument list of a call to printf, scanf, etc., the compiler found that both the flags ‘*’ and ‘flag’ appear in the format string. use of C99 long long integer constants Integer constants are not allowed to be declared long long in ISO C89. use of ‘length’ length modifier with ‘type’ type character When checking the argument list of a call to printf, scanf, etc., the compiler found that the specified length was incorrectly used with the specified type. ‘name’ used but never defined The specified function was used but never defined. ‘name’ used with ‘spec’ ‘function’ format ‘name’ is not valid with the conversion specification ‘spec’ in the format of the specified function. useless keyword or type name in empty declaration An empty declaration contains a useless keyword or type name. DS51284H-page 200 © 2008 Microchip Technology Inc.
V Diagnostics __VA_ARGS__ can only appear in the expansion of a C99 variadic macro The predefined macro __VA_ARGS should be used in the substitution part of a macro definition using ellipses. value computed is not used A value computed is not used. variable ‘name’ declared ‘inline’ The keyword ‘inline’ should be used with functions only. variable ‘%s’ might be clobbered by ‘longjmp’ or ‘vfork’ A non-volatile automatic variable might be changed by a call to longjmp. These warnings are possible only in optimizing compilation. volatile register variables don’t work as you might wish Passing a variable as an argument could transfer the variable to a different register (w0-w7) than the one specified (if not w0-w7) for argument transmission. Or the compiler may issue an instruction that is not suitable for the specified register and may need to temporarily move the value to another place. These are only issues if the specified register is modified asynchronously (i.e., though an ISR). W -Wformat-extra-args ignored without -Wformat -Wformat must be specified to use -Wformat-extra-args. -Wformat-nonliteral ignored without -Wformat -Wformat must be specified to use -Wformat-nonliteral. -Wformat-security ignored without -Wformat -Wformat must be specified to use -Wformat-security. -Wformat-y2k ignored without -Wformat -Wformat must be specified to use. -Wid-clash-LEN is no longer supported The option -Wid-clash-LEN is no longer supported. -Wmissing-format-attribute ignored without -Wformat -Wformat must be specified to use -Wmissing-format-attribute. -Wuninitialized is not supported without -O Optimization must be on to use the -Wuninitialized option. ‘identifier’ was declared ‘extern’ and later ‘static’ The specified identifier was previously declared ‘extern’ and is now being declared as static. ‘identifier’ was declared implicitly ‘extern’ and later ‘static’ The specified identifier was previously declared implicitly ‘extern’ and is now being declared as static. ‘identifier’ was previously implicitly declared to return ‘int’ There is a mismatch against the previous implicit declaration. © 2008 Microchip Technology Inc. DS51284H-page 201
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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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A.24 GETENV A.25 SYSTEM A.26 STRERR
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B.1 INTRODUCTION MPLAB ® C COMPILE
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__builtin_btg Built-in Functions De
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__builtin_clr_prefetch Argument: xp
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__builtin_dmaoffset Built-in Functi
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Page 157 and 158: __builtin_modsd Argument: dividend
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Page 161 and 162: __builtin_mulss Built-in Functions
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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
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Page 189 and 190: Diagnostics anonymous union declare
Page 191 and 192: Diagnostics comparison between sign
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Page 199 and 200: Diagnostics library function ‘ide
Page 201 and 202: P Diagnostics parameter has incompl
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Page 205: Diagnostics too many arguments for
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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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