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To suppress this warning use the unused attribute (see Variable Attributes). See http://www.adacore.com/2007/11/19/ada-gem-18/. Slightly slower than levels 1 or 2 when optimization is enabled. Typically, the compiler warns if a const char * variable is passed to a function that takes a char * parameter.

This warning is enabled by -Wall. -Wunused-but-set-parameterWarn whenever a function parameter is assigned to, but otherwise unused (aside from its declaration). Unfortunately, in this case there is no specific option that covers that warning. GCC also warns about function definitions that might be candidates for format attributes. Warns for all pointer conversions between possibly incompatible types, even if never dereferenced.

For example, warn if a const char * is cast to an ordinary char *. Often programmers expect it to be a value computed inside the conditional expression instead. To suppress this warning use the unused attribute (see Variable Attributes). One proposal: -Werror makes all warnings into errors, preventing compilation (see also -Wfatal-errors).

This warning is also enabled by -Wunused together with -Wextra. -Wunused-but-set-variableWarn whenever a local variable is assigned to, but otherwise unused (aside from its declaration). 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). Some users try to use -pedantic to check programs for conformance. For example, the following new expression is not diagnosed at this level even though it has undefined behavior according to the C++ standard because it writes past the end of the

Does a survey require an ethical approval? share|improve this answer edited Mar 10 '10 at 15:08 answered Mar 10 '10 at 3:22 ezpz 7,14312732 Yeah, nothing in what he pasted would have resulted in -Werror being I had meant that I've made sure that my code is warning free (I've not disabled all the warnings) –Saurabh Verma Jul 20 '12 at 14:26 add a comment| up vote See Alternate Keywords.

Can Communism become a stable economic strategy? In particular, instead of testing for equality, you should check to see whether the two values have ranges that overlap; and this is done with the relational operators, so equality comparisons Richard. switch (cond) { case 1: bar (0); /* FALLTHRU */ default: ... } This warning is enabled by -Wextra. -Wignored-qualifiers (C and C++ only)Warn if the return type of a function

However, -Wno-error=foo does not imply anything. -Wfatal-errorsThis option causes the compiler to abort compilation on the first error occurred rather than trying to keep going and printing further error messages. 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 Some spurious warnings can be avoided if you declare all the functions you use that never return as noreturn. options are not implied by -Wall.

Typically, the compiler warns if a const int (*)[] variable is passed to a function that takes a int (*)[] parameter. To suppress this warning use the unused attribute (see Variable Attributes). -Wunused-local-typedefs (C, Objective-C, C++ and Objective-C++ only)Warn when a typedef locally defined in a function is not used. Possibly useful when higher levels do not warn but -fstrict-aliasing still breaks the code, as it has very few false negatives. Some of them are enabled by -Wextra but many of them must be enabled individually. -WextraThis enables some extra warning flags that are not enabled by -Wall. (This option used to

Though it's advisable to seek out a proper patch first. Some traditional implementations do not recognize #elif, so this option suggests avoiding it altogether. This warning is enabled by -Wextra in C99 and C++11 modes (and newer). -Wshift-overflow-Wshift-overflow=nWarn about left shift overflows. It had to be prior to the excerpt. –Tim Post♦ Mar 10 '10 at 3:49 I know its not a good idea, and I tried building an older version

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 ISO C such a type qualifier has no effect, since the value returned by a function is not an lvalue. Ensign wrote: > > > I'd like to tell gcc to quit when a warning is encountered > > > (or even if a specific warning is encountered). A function returns normally if it doesn't contain an infinite loop or return abnormally by throwing, calling abort or trapping.

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 The C standard defines the order in which expressions in a C program are evaluated in terms of sequence points, which represent a partial ordering between the execution of parts of Numeric arguments that are known to be bounded to a subrange of their type, or string arguments whose output is bounded either by their directive's precision or by a finite set At this level, numeric arguments to format directives with unknown values are assumed to have the value of one, and strings of unknown length to be empty.

If n is 0 (the default), there is no limit on the number of error messages produced. While enabling optimization will in most cases improve the accuracy of the warning, it may also result in false positives. -Wformat-length-Wformat-length=1Level 1 of -Wformat-length enabled by -Wformat employs a conservative approach In the United States is racial, ethnic, or national preference an acceptable hiring practice for departments or companies in some situations? Instead of the these attributes, it is also possible to add a "falls through" comment to silence the warning.

Does not warn about incomplete types. -Wstrict-overflow-Wstrict-overflow=nThis option is only active when -fstrict-overflow is active. It warns about code which might break the strict aliasing rules that the compiler is using for optimization. share|improve this answer answered Jan 24 '09 at 3:17 Stephen Doyle 2,9351215 Amen, your code should be warning-free with at least -Wall (although some of the stuff that -Wextra Putting pin(s) back into chain How to handle a senior developer diva who seems unaware that his skills are obsolete?

share|improve this answer answered May 9 '13 at 16:49 Bob Blogge 1317 add a comment| up vote 0 down vote How about putting "pragma warnings(off, "...")" into the offending parts of At this level the warning is not issued for some strictly undefined constructs that GCC allows as extensions for compatibility with legacy code. For instance, warn for the following code: if (p->q != NULL) { ... } else if (p->q != NULL) { ... } -Wframe-addressWarn when the ‘__builtin_frame_address’ or ‘__builtin_return_address’ is called with Also warn when making a cast that introduces a type qualifier in an unsafe way.