Im folgenden werden die möglichen Einstellungen für die Compiler-Warnungen des Projekt-Optionen Dialogs, Seite 3, erläutert. Die Erklärungen selbst sind der man-page des GCC, egcs Version 1.1.1 entnommen. Die Warnungen selbst sind diagnostische Meldungen, die anzeigen, das die entsprechenden Programmanweisungen möglicherweise Fehler verursachen.
Standard-Warnungen kombiniert
Compiliere mit -W. Diese Einstellung fügt Warnungen hinzu, die nicht in -Wall enthalten sind. Bitte lesen Sie die GCC-Info für weitere Informationen.
Warnungen über bestimmte Konstruktionen ausgeben, die sich unter traditionellem und ANSI C verschieden verhalten.
Warnung anzeigen, falls ein undefinierter Bezeichner in einer '#if' Direktive verwendet wird
Warnung anzeigen, falls eine lokale Variable eine andere lokale Variable überdeckt.
Warnung anzeigen, falls zwei verschieden Bezeichner in den ersten LEN Buchstaben übereinstimmen. Dies kann bei der Übersetzung eines Programms mit einigen nicht mehr zu verwendenden Compilern helfen.
Warnung anzeigen, falls ein Objekt mit einer Größe über LEN Bytes definiert wird.
Warn about anything that depends on the «size of» a function type or of void. GNU C assigns these types a size of 1, for convenience in calculations with void * pointers and pointers to functions.
Warn whenever a function call is cast to a non-matching type. Forexample, warn if int malloc() is cast to anything *.
Warn whenever a pointer is cast so as to remove a type qualifier from the target type. For example, warn if a const char * is cast to an ordinary char *.
Warn whenever a pointer is cast such that the required alignment of the target is increased. For example, warn if a char * is cast to an int * on machines where integers can only be accessed at two- or four-byte boundaries.
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 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; this is why we did not make `-Wall' request these warnings.
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.
Warn when a comparison between signed and unsigned values could produce an incorrect result when the signed value is converted to unsigned.
Warn if any functions that return structures or unions are defined or called. (In languages where you can return an array, this also elicits a warning.)
Warn if a global function is defined without a previous prototype declaration. This warning is issued even if the definition itself provides a prototype. The aim is to detect global functions that fail to be declared in header files.
Warn if a global function is defined without a previous declaration. Do so even if the definition itself provides a prototype. Use this option to detect global functions that are not declared in header files. -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.
Warn if anything is declared more than once in the same scope even in cases where multiple declaration is valid and changes nothing.
Warn if an extern declaration is encountered within an function.
Warn if a function can not be inlined, and either it was declared as inline, or else the -fin*line-functions option was given.
Warn if an old-style (C-style) cast is used within a program
(C++ only.) In a derived class, the definitions of virtual functions must match the type signature of a virtual function declared in the base class. Use this option to request warnings when a derived class declares a function that may be an erroneous attempt to define a virtual function: that is, warn when a function with the same name as a virtual function in the base class, but with a type signature that doesn't match any virtual functions from the base class.
Warn when g++'s synthesis behavoir does not match that of cfront.
(-Werror) Treat warnings as errors; abort compilation after any warning.
For a release of your project, it is recommended to enable -Wall.