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

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16-Bit C Compiler User’s Guide TABLE 3-6: WARNING/ERROR OPTIONS NOT IMPLIED BY -WALL -Wconversion Warn if a prototype causes a type conversion that is different from what would happen to the same argument in the absence of a prototype. This includes conversions of fixed point to floating and vice versa, and conversions changing the width or signedness of a fixed point argument, except when the same as the default promotion. Also, warn if a negative integer constant expression is implicitly converted to an unsigned type. For example, warn about the assignment x = -1 if x is unsigned. But do not warn about explicit casts like (unsigned) -1. -Werror Make all warnings into errors. -Winline Warn if a function can not be inlined, and either it was declared as inline, or else the -finline-functions option was given. -Wlarger-than-len Warn whenever an object of larger than len bytes is defined. -Wlong-long -Wno-long-long Warn if long long type is used. This is default. To inhibit the warning messages, use -Wno-long-long. Flags -Wlong-long and -Wno-long-long are taken into account only when -pedantic flag is used. -Wmissing-declarations Warn if a global function is defined without a previous declaration. Do so even if the definition itself provides a prototype. -Wmissingformat-attribute If -Wformat is enabled, also warn about functions that might be candidates for format attributes. Note these are only possible candidates, not absolute ones. This option has no effect unless -Wformat is enabled. -Wmissing-noreturn Warn about functions that might be candidates for attribute noreturn. These are only possible candidates, not absolute ones. Care should be taken to manually verify functions. Actually, do not ever return before adding the noreturn attribute; otherwise subtle code generation bugs could be introduced. -Wmissing-prototypes Warn if a global function is defined without a previous prototype declaration. This warning is issued even if the definition itself provides a prototype. (This option can be used to detect global functions that are not declared in header files.) -Wnested-externs Warn if an extern declaration is encountered within a function. -Wno-deprecateddeclarations Option Definition Do not warn about uses of functions, variables and types marked as deprecated by using the deprecated attribute. -Wpadded Warn if padding is included in a structure, either to align an element of the structure or to align the whole structure. -Wpointer-arith Warn about anything that depends on the size of a function type or of void. The compiler assigns these types a size of 1, for convenience in calculations with void * pointers and pointers to functions. -Wredundant-decls Warn if anything is declared more than once in the same scope, even in cases where multiple declaration is valid and changes nothing. -Wshadow Warn whenever a local variable shadows another local variable. DS51284H-page 44 © 2008 Microchip Technology Inc.
Using the Compiler on the Command Line TABLE 3-6: WARNING/ERROR OPTIONS NOT IMPLIED BY -WALL Option Definition -Wsign-compare -Wno-sign-compare Warn when a comparison between signed and unsigned values could produce an incorrect result when the signed value is converted to unsigned. This warning is also enabled by -W; to get the other warnings of -W without this warning, use -W -Wno-sign-compare. -Wstrict-prototypes Warn if a function is declared or defined without specifying the argument types. (An old-style function definition is permitted without a warning if preceded by a declaration which specifies the argument types.) -Wtraditional Warn about certain constructs that behave differently in traditional and ANSI C. • Macro arguments occurring within string constants in the macro body. These would substitute the argument in traditional C, but are part of the constant in ANSI C. • A function declared external in one block and then used after the end of the block. • A switch statement has an operand of type long. • A nonstatic function declaration follows a static one. This construct is not accepted by some traditional C compilers. -Wundef Warn if an undefined identifier is evaluated in an #if directive. -Wunreachable-code Warn if the compiler detects that code will never be executed. It is possible for this option to produce a warning even though there are circumstances under which part of the affected line can be executed, so care should be taken when removing apparently-unreachable code. For instance, when a function is inlined, a warning may mean that the line is unreachable in only one inlined copy of the function. -Wwrite-strings Give string constants the type const char[length] so that copying the address of one into a non-const char * pointer will get a warning. These warnings will help you find at compile time code that you can try to write into a string constant, but only if you have been very careful about using const in declarations and prototypes. Otherwise, it will just be a nuisance, which is why -Wall does not request these warnings. © 2008 Microchip Technology Inc. DS51284H-page 45
Page 1 and 2: MPLAB ® C COMPILER FOR PIC24 MCUs
Page 5 and 6: Table of Contents A.5 Identifiers .
Page 7 and 8: INTRODUCTION MPLAB ® C COMPILER FO
Page 9 and 10: CONVENTIONS USED IN THIS GUIDE The
Page 11 and 12: THE MICROCHIP WEB SITE Preface C Re
Page 13 and 14: 1.1 INTRODUCTION 1.2 HIGHLIGHTS MPL
Page 15 and 16: 1.5 COMPILER FEATURE SET Compiler O
Page 19 and 20: Differences Between 16-Bit Device C
Page 41 and 42: Using the Compiler on the Command L
Page 49: Using the Compiler on the Command L
Page 65 and 66: 3.6 ENVIRONMENT VARIABLES Using the
Page 69 and 70: 4.1 INTRODUCTION 4.2 HIGHLIGHTS 4.3
Page 71 and 72: 4.5 MEMORY SPACES Run Time Environm
Page 73 and 74: Run Time Environment 1. It is possi
Page 75 and 76: 4.8 SOFTWARE STACK Run Time Environ
Page 77 and 78: FIGURE 4-2: CALL OR RCALL Stack gro
Page 79 and 80: 4.11 FUNCTION CALL CONVENTIONS Run
Page 81 and 82: Run Time Environment The compiler a
Page 83 and 84: 4.14.2 String Literals as Arguments
Page 87 and 88: 6.1 INTRODUCTION MPLAB ® C COMPILE
Page 89 and 90: 6.3 PMP POINTERS Additional C Point
Page 91 and 92: 6.4 EXTERNAL POINTERS 6.3.3 Define
Page 93 and 94: ead_external16 Additional C Pointer
Page 95 and 96: Additional C Pointer Types } else {
Page 99 and 100: 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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8.1 INTRODUCTION 8.2 HIGHLIGHTS MPL
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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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MPLAB ® C COMPILER FOR PIC24 MCUs
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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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__builtin_fbcl Built-in Functions A
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__builtin_modsd Argument: dividend
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__builtin_mpy Error Messages An err
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__builtin_mulss Built-in Functions
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__builtin_psvoffset Built-in Functi
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__builtin_subab Built-in Functions
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__builtin_tblwth Built-in Functions
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C.1 INTRODUCTION C.2 ERRORS MPLAB
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Diagnostics ambiguous abbreviation
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Diagnostics cast specifies function
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F Diagnostics ‘identifier’ fail
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Diagnostics initializer for static
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Diagnostics invalid use of undefine
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N Diagnostics negative width in bit
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R Diagnostics redeclaration of ‘i
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Diagnostics symbol ‘symbol’ not
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Diagnostics void expression between
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Diagnostics anonymous union declare
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Diagnostics comparison between sign
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duplicate ‘const’ The ‘const
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Diagnostics function might be possi
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Diagnostics ‘identifier’ is nar
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Diagnostics library function ‘ide
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P Diagnostics parameter has incompl
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Diagnostics shift count >= width of
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Diagnostics too many arguments for
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V Diagnostics __VA_ARGS__ can only
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MPLAB C Compiler for PIC18 MCUs vs.
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E.1 INTRODUCTION E.2 HIGHLIGHTS MPL
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G.1 PREAMBLE MPLAB ® C COMPILER FO
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G.3 VERBATIM COPYING G.4 COPYING IN
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GNU Free Documentation License incl
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Glossary File Registers On-chip dat
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Glossary Machine Language A set of
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Glossary Stack, Software Memory use
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Symbols __builtin_add..............
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-fpack-struct .....................
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-idirafter.........................
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Peephole Optimization..............
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-Wsequence-point...................
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MPLAB C Compiler for PIC24 MCUs and dsPIC DSCs ... - Microchip

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