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gcc consider warning as error Walkerton, Virginia

With this option, they are rejected. -Wpedantic does not cause warning messages for use of the alternate keywords whose names begin and end with ‘__’. See Options to Request or Suppress Warnings, for more detail on these and related command-line options. Also warn about ISO C constructs that have no traditional C equivalent, and/or problematic constructs that should be avoided. In traditional C macro replacement takes place within string literals, but in ISO C it does not.

A function-like macro that appears without arguments. These warnings occur for individual uninitialized or clobbered elements of structure, union or array variables as well as for variables that are uninitialized or clobbered as a whole. Browse other questions tagged c gcc compiler-warnings or ask your own question. This warning is more effective with link time optimization, where the information about the class hierarchy graph is more complete.

Do so even if the definition itself provides a prototype. This risk is even higher in a corporate environment, where you'll have to convince your boss to leave you some time to fix the warnings. –JesperE Apr 26 '10 at 6:44 This warning is enabled by -Wextra in C99 and C++11 modes (and newer). -Wshift-overflow-Wshift-overflow=nWarn about left shift overflows. The actual requirements may be somewhat greater than len even if you do not get a warning.

This warning is only issued if the base of the constant is ten. Use of ISO C style function definitions. It is easy to accidentally do computations with double because floating-point literals are implicitly of type double. A feature to report any failure to conform to ISO C might be useful in some instances, but would require considerable additional work and would be quite different from -Wpedantic.

Meaning of "oh freak" In the United States is racial, ethnic, or national preference an acceptable hiring practice for departments or companies in some situations? And I still have no idea if this list is comprehensive. Does chilli get milder with cooking? This is a common cause of error, as programmers often forget that this type is signed on some machines.

This warning is also enabled by -Wall. -Wimplicit (C and Objective-C only)Same as -Wimplicit-int and -Wimplicit-function-declaration. Where the standard specified with -std represents a GNU extended dialect of C, such as `gnu89' or `gnu99', there is a corresponding base standard, the version of ISO C on which Some of them warn about constructions that users generally do not consider questionable, but which occasionally you might wish to check for; others warn about constructions that are necessary or hard Anyone who just turns on everything is probably either doing so because they're clueless because or a pointy-haired boss said "no warnings." Some warnings are important, and some aren't.

One proposal: -Werror makes all warnings into errors, preventing compilation (see also -Wfatal-errors). I mean, if I knew all the exact warnings then I would've just turned them on manually, no need to pose the question. Any specific warning can be disabled with the -Wno-$foo syntax, which makes it easy to excuse the specifics. 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

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 Such a type qualifier has no effect, since the value returned by a function is not an lvalue. According to the C Standard, this usage is obsolescent. Compute the kangaroo sequence more hot questions question feed lang-c about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life /

A function returns normally if it doesn't contain an infinite loop or return abnormally by throwing, calling abort or trapping. more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed In what atmospheric densities or pressures have aerobrakings been performed? This warning intentionally is not issued for prototype declarations or variadic functions because these ISO C features will appear in your code when using libiberty's traditional C compatibility macros, PARAMS and

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. asked 4 years ago viewed 57921 times active 1 month ago Linked 0 bunch of errors and warnings while compiling in gcc linux Related 103How to disable GCC warnings for a If you don't specify -O, you simply won't get these warnings. These occur after the evaluation of a full expression (one which is not part of a larger expression), after the evaluation of the first operand of a &&, ||, ? :

etc. struct S { int n, a[1]; }; S *s = (S *)malloc (sizeof *s + 31 * sizeof s->a[0]); new (s->a)int [32](); -Wplacement-new=2At this level, in addition to diagnosing all the A switch statement has an operand of type long. It probably is, but the only list that is 100% comprehensive is the actual source for the compiler.

I've had a few people write code that works just fine on Windows but crashes immediately on Linux. –Dennis Meng Jul 19 '12 at 16:39 Thanks everyone for their This warning is enabled by -Wall. -Wunused-labelWarn whenever a label is declared but not used. If Dumbledore is the most powerful wizard (allegedly), why would he work at a glorified boarding school? Does chilli get milder with cooking?

This is why we did not make -Wall request these warnings. In the United States is racial, ethnic, or national preference an acceptable hiring practice for departments or companies in some situations? The ISO type of an integer constant has a different width or signedness from its traditional type. Here is an example of such a case: { if (a) if (b) foo (); else bar (); } In C, every else branch belongs to the innermost possible if statement,

Only the warning for an assignment used as a truth value is supported when compiling C++; the other warnings are only supported when compiling C. This will not stop errors for incorrect use of supported attributes. -Wstrict-prototypes (C only)Warn if a function is declared or defined without specifying the argument types. (An old-style function definition is 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 The older name is still supported, but the newer name is more descriptive.) Print extra warning messages for these events: A function can return either with or without a value. (Falling

At present, this warns about calls to printf and scanf functions where the format string is not a string literal and there are no format arguments, as in printf (foo);. Why not K&R compatible too? –anon Apr 4 '10 at 20:54 2 Also concider building in 64 bit mode (-m64 for gcc) - that might show some more warnings :) 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 Why microcontroller takes many clock cycles to start up with PLL clock source?

If your goal is to make the most portable, most standards-compliant code, then yes, I'd highly recommend always using -Werror and -pedantic-error (along with -Wall and -Wextra), especially when starting new more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed Join them; it only takes a minute: Sign up How to compile without warnings being treated as errors?