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This warning is enabled by -Wall. -Wsequence-pointWarn about code that may have undefined semantics because of violations of sequence point rules in the C and C++ standards. This warning is enabled by -Wall for C and C++. -Wno-return-local-addrDo not warn about returning a pointer (or in C++, a reference) to a variable that goes out of scope after This warning is enabled by -Wall. -WcommentWarn whenever a comment-start sequence ‘/*’ appears in a ‘/*’ comment, or whenever a Backslash-Newline appears in a ‘//’ comment. This includes standard functions, and others specified by format attributes (see Function Attributes), in the printf, scanf, strftime and strfmon (an X/Open extension, not in the C standard) families (or other

A non-static function declaration follows a static one. Unproven vs. In order to get a warning about an unused function parameter, you must either specify -Wextra -Wunused (note that -Wall implies -Wunused), or separately specify -Wunused-parameter. -WuninitializedWarn if an automatic variable NFC is the recommended form for most uses.

A function declared external in one block and then used after the end of the block. Specifically, it warns if the same actual argument is associated with a dummy argument with INTENT(IN) and a dummy argument with INTENT(OUT) in a call with an explicit interface. Each of these specific warning options also has a negative form beginning -Wno- to turn off warnings; for example, -Wno-implicit. For instance, warn about use of variable length arrays, long long type, bool type, compound literals, designated initializers, and so on.

This is a common cause of error, as programmers often forget that this type is signed on some machines. Note, -Wtabs is active for -pedantic, -std=f95, -std=f2003, -std=f2008, -std=f2008ts and -Wall. -Wundefined-do-loopWarn if a DO loop with step either 1 or -1 yields an underflow or an overflow during iteration It can be disabled with the -Wno-jump-misses-init option. -Wsign-compareWarn when a comparison between signed and unsigned values could produce an incorrect result when the signed value is converted to unsigned. Sometimes when this happens it is possible to rearrange the fields of the structure to reduce the padding and so make the structure smaller. -Wredundant-declsWarn if anything is declared more than

However, in the case of scanf formats, this option will suppress the warning if the unused arguments are all pointers, since the Single Unix Specification says that such unused arguments are See also -frealloc-lhs. -Wrealloc-lhs-allWarn when the compiler inserts code to for allocation or reallocation of an allocatable variable; this includes scalars and derived types. -Wcompare-realsWarn when comparing real or complex types At this level the warning is not issued for some strictly undefined constructs that GCC allows as extensions for compatibility with legacy code. Here is another common case: { int save_y; if (change_y) save_y = y, y = new_y; ...

This option implies -Wunused-const-variable=1 for C, but not for C++. Unfortunately, in this case there is no specific option that covers that warning. For C++, the warning is only emitted for scalar types or void. In order to get a warning about an unused function parameter, you must either specify `-Wextra -Wunused' (note that `-Wall' implies `-Wunused'), or separately specify -Wunused-parameter. -WuninitializedWarn if an automatic variable

Such calls may return indeterminate values or crash the program. This warning is enabled by default in C++ and is enabled by either -Wall or -Wpedantic. -Wmissing-bracesWarn if an aggregate or union initializer is not fully bracketed. These functions changed semantics in GCC 4.4. -WtrigraphsWarn if any trigraphs are encountered that might change the meaning of the program (trigraphs within comments are not warned about). This warning is enabled by -Wall.

Where the standard specified with -std represents a GNU extended dialect of C, such as ‘gnu90’ or ‘gnu99’, there is a corresponding base standard, the version of ISO C on which It warns about functions that are not protected against stack smashing. -Woverlength-stringsWarn about string constants that are longer than the “minimum maximum” length specified in the C standard. This warning is more effective with link time optimization, where the information about the class hierarchy graph is more complete. Level 2: Aggressive, quick, not too precise.

If this command line option is used, warnings will even be issued for unknown pragmas in system header files. In C++, warn if a non-static reference or non-static ‘const’ member appears in a class without constructors. There are viable alternatives. These warnings occur for individual uninitialized or clobbered elements of structure, union or array variables as well as for variables which are uninitialized or clobbered as a whole.

For example, GCC will warn about i being uninitialized in the following snippet only when -Winit-self has been specified: int f() { int i = i; return i; } -Wimplicit-intWarn when Why was the identity of the Half-Blood Prince important to the story? To eliminate the warning, add explicit braces around the innermost if statement so there is no way the else can belong to the enclosing if. This warning is enabled by -Wall. -Wimplicit-function-declaration (C and Objective-C only)Give a warning whenever a function is used before being declared.

asked 7 years ago viewed 8693 times active 6 years ago Linked 25 Implicit function declarations in C 0 gcc, change some warnings into errors 3 Make a specific gcc warning To suppress this warning use the ‘unused’ attribute (see Variable Attributes). With -funsafe-loop-optimizations warn if the compiler makes such assumptions. -Wno-pedantic-ms-format (MinGW targets only)When used in combination with -Wformat and -pedantic without GNU extensions, this option disables the warnings about non-ISO printf If the stack usage is fully static but exceeds the specified amount, it's: warning: stack usage is 1120 bytes If the stack usage is (partly) dynamic but bounded, it's: warning: stack

gcc compiler-warnings compiler-options share|improve this question asked Feb 2 '15 at 13:07 bolov 13.3k22869 add a comment| 1 Answer 1 active oldest votes up vote 1 down vote No there is Browse other questions tagged gcc warnings or ask your own question. A switch statement has an operand of type long. asked 7 years ago viewed 19938 times active 10 months ago Linked 29 disable specific warnings in gcc 13 Disable warning/error for default warnings 0 Purposely hidden overloaded function warning avoidance

The aim is to detect global functions that fail to be declared in header files. -Wmissing-declarations (C only)Warn if a global function is defined without a previous declaration. For example, warn if int malloc() is cast to anything *. -Wcast-qualWarn whenever a pointer is cast so as to remove a type qualifier from the target type. Currently equivalent to -Wformat -Wformat-nonliteral -Wformat-security -Wformat-y2k. -Wformat-nonliteralIf -Wformat is specified, also warn if the format string is not a string literal and so cannot be checked, unless the format function Even with this option, the compiler will not warn about failures to inline functions declared in system headers.

For ISO C, follows the version of the ISO C standard specified by any -std option used.