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This option also warns when a non-volatile automatic variable might be changed by a call to longjmp. To find them all you're better off looking at the Options Summary Turning on everything would include -Wdouble-promotion which is only relevant on CPUs with a 32-bit single-precision floating-point unit which Some users try to use -pedantic to check programs for strict ISO C conformance. Note these are only possible candidates, not absolute ones.

Other library implementations may not support all these features; GCC does not support warning about features that go beyond a particular library's limitations. For instance, warn about use of anonymous structures and unions, _Atomic type qualifier, _Thread_local storage-class specifier, _Alignas specifier, Alignof operator, _Generic keyword, and so on. See Alternate Keywords. And I still have no idea if this list is comprehensive.

Runs in the front end only. This also enables some language-specific warnings described in C++ Dialect Options and Objective-C Dialect Options. The following -W... Do you really care about compatibility with 30 year old compilers? 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

asked 1 year ago viewed 3215 times active 1 year ago Related 103How to disable GCC warnings for a few lines of code37How to disable compiler optimizations in gcc?1644Why doesn't GCC Does not warn about incomplete types. -Wstrict-overflow-Wstrict-overflow=nThis option is only active when -fstrict-overflow is active. Also warn about any `return' statement with no return-value in a function whose return-type is not `void'. `-Wswitch' Warn whenever a `switch' statement has an index of enumeral type and lacks but I want to make the following warning into an error: "Class xxx has virtual functions but non-virtual destructor" The only way I know you can get this error is by

Do not warn for explicit casts like abs ((int) x) and ui = (unsigned) -1, or if the value is not changed by the conversion like in abs (2.0). Level 2: Aggressive, quick, not too precise. Join them; it only takes a minute: Sign up Make a specific gcc warning into an error up vote 3 down vote favorite So I know I can turn warnings into Links to discussions of the problem, including proposed formal definitions, may be found on the GCC readings page, at http://gcc.gnu.org/readings.html. -Wreturn-typeWarn whenever a function is defined with a return-type that defaults

This has been fixed in GCC 4.4 but the change can lead to differences in the structure layout. For example there is no longer a 4-bit padding between field a and b in this structure: struct foo { char a:4; char b:8; } __attribute__ ((packed)); This warning is enabled Therefore, they do not occur for a variable that is declared `volatile', or whose address is taken, or whose size is other than 1, 2, 4 or 8 bytes. You will not get a warning for main in hosted C environments. -Wmissing-format-attributeIf -Wformat is enabled, also warn about functions which might be candidates for format attributes.

This manual lists only one of the two forms, whichever is not the default. Some traditional implementations would not recognize `#elif', so it suggests avoiding it altogether. If you are doing this, then you need to compute (by analyzing the code, or in some other way) the maximum or likely maximum error that the computation introduces, and allow Traditional C lacks a separate namespace for labels.

Does a survey require an ethical approval? This allows the use of new -Wno- options with old compilers, but if something goes wrong, the compiler warns that an unrecognized option is present. -Wpedantic-pedanticIssue all the warnings demanded by Such uses typically indicate a programmer error: the address of a function always evaluates to true, so their use in a conditional usually indicate that the programmer forgot the parentheses in 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

Also warn about ISO C constructs that have no traditional C equivalent, and/or problematic constructs which should be avoided. For example, warn about the assignment `x = -1' if `x' is unsigned. GCC informs you when the offset of such a field has changed in GCC 4.4. For C++, this is possible (the -Wtraditional flag doesn't exist), and very simple programs can be compiled.

Often, the problem is that your code is too big or too complex; GCC will refuse to optimize programs when the optimization itself is likely to take inordinate amounts of time. For example, the following code would cause such a warning, because x.h would be implicitly initialized to zero: struct s { int f, g, h; }; struct s x = { The message is in keeping with the output of -fstack-usage. They do not occur for variables or elements declared volatile.

In 4.1.2, only -Werror-implicit-function-declaration works. Gcc has shown me warnings from std lib. –Valentin Heinitz Sep 5 at 8:27 add a comment| up vote 6 down vote It's simply impossible to program with all warnings enabled if (change_y) y = save_y; } This has no bug because save_y is used only if it is set. 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

For example: abs (x) >= 0. To suppress this warning use the unused attribute (see Variable Attributes). -Wunused-const-variable=1This is the warning level that is enabled by -Wunused-variable for C. At level 2, unknown numeric arguments are assumed to have the minimum representable value for signed types with a precision greater than 1, and the maximum representable value otherwise. This is not the case if the warnings were only enabled by the -Wall command line option. -Wno-pragmasDo not warn about misuses of pragmas, such as incorrect parameters, invalid syntax, or

The C and C++ standards define the order in which expressions in a C/C++ program are evaluated in terms of sequence points, which represent a partial ordering between the execution of To eliminate the warning, add explicit braces around the innermost if statement so there is no way the else could belong to the enclosing if. For C++, the warning is only emitted for scalar types or void. 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

Warnings about conversions between signed and unsigned integers are disabled by default in C++ unless -Wsign-conversion is explicitly enabled. -Wempty-bodyWarn if an empty body occurs in an `if', `else' or `do 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 also enabled by -Wextra. -Wconditionally-supported (C++ and Objective-C++ only)Warn for conditionally-supported (C++11 [intro.defs]) constructs. -WconversionWarn for implicit conversions that may alter a value. For example, an expression such as x[i,j] causes a warning, while x[(void)i,j] does not.

To inhibit the warning messages, use -Wno-variadic-macros. -WvlaWarn if variable length array is used in the code. -Wno-vla will prevent the -pedantic warning of the variable length array. -Wvolatile-register-varWarn if a 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. However many times as I do quick compile tests I need to ignore the -Wunused suit of errors. How should I interpret "English is poor" review when I used a language check service before submission?

Other than as expressed by the sequence point rules, the order of evaluation of subexpressions of an expression is not specified. When compiling C++, warn about the deprecated conversion from string literals to char *. For unused variables and parameters, use the `unused' attribute (see Variable Attributes.). `-Wuninitialized' An automatic variable is used without first being initialized. GCC will guess that function pointers with format attributes that are used in assignment, initialization, parameter passing or return statements should have a corresponding format attribute in the resulting type.

This suppresses warnings for redefinition of __TIMESTAMP__, __TIME__, __DATE__, __FILE__, and __BASE_FILE__. -Wstrict-prototypes (C and Objective-C only)Warn if a function is declared or defined without specifying the argument types. (An old-style If you are doing this, then you need to compute (by analyzing the code, or in some other way) the maximum or likely maximum error that the computation introduces, and allow As a result, you may get a warning even when there is in fact no problem because longjmp cannot in fact be called at the place which would cause a problem. int a[2][2] = { 0, 1, 2, 3 }; int b[2][2] = { { 0, 1 }, { 2, 3 } }; -WparenthesesWarn if parentheses are omitted in certain contexts, such

Does a survey require an ethical approval? Note that it does not warn about all cases where the code might overflow: it only warns about cases where the compiler implements some optimization. This option is only active when -fdelete-null-pointer-checks is active, which is enabled by optimizations in most targets.