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gcc warning error Waunakee, Wisconsin

Is there any way I can compile successfully in spite of the warnings? This warning does not generally indicate that there is anything wrong with your code; it merely indicates that GCC's optimizers were unable to handle the code effectively. 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. Developing web applications for long lifespan (20+ years) What would be the atomic no.

hexadecimal or octal values, which typically represent bit patterns, are not warned about. If a source file is changed between compiling with -fprofile-gen and with -fprofile-use, the files with the profile feedback can fail to match the source file and GCC cannot use the We don't have plans to support such a feature in the near future. To suppress this warning use the unused attribute (see Variable Attributes).

Macro parameters that appear within string literals in the macro body. Each of these specific warning options also has a negative form beginning `-Wno-' to turn off warnings; for example, -Wno-implicit. GCC reports errors with the source file name and line number where the problem is apparent. I.e.

Not the answer you're looking for? For example, the call to sprintf below is diagnosed because even with both a and b equal to zero, the terminating NUL character ('\0') appended by the function to the destination the left-hand side of the assignment or initialization, the type of the parameter variable, or the return type of the containing function respectively should also have a format attribute to avoid It is not specified when between sequence points modifications to the values of objects take effect.

Most are for C++ though. This allows GCC to more aggressively devirtualize the polymorphic calls. See Function Attributes. -Wunknown-pragmasWarn when a #pragma directive is encountered which is not understood by GCC. How to use the binomial theorem to calculate binomials with a negative exponent Why must the speed of light be the universal speed limit for all the fundamental forces of nature?

share|improve this answer edited Dec 6 '15 at 7:44 Jonathan Leffler 439k62511823 answered Jun 1 '09 at 16:47 lothar 14.8k43055 Doesn't answer the question: how can one disable a How to handle a senior developer diva who seems unaware that his skills are obsolete? It probably is, but the only list that is 100% comprehensive is the actual source for the compiler. This option is enabled by -Wall.

And: -Wextra Which enables some options that are nice to have as well. Warnings from system headers are normally suppressed, on the assumption that they usually do not indicate real problems and would only make the compiler output harder to read. This switch takes a negative form, to be used to negate -Werror for specific warnings; for example -Wno-error=switch makes -Wswitch warnings not be errors, even when -Werror is in effect. How do I tell GCC to enable (no if's, and's, or but's!) all the warnings it has?

GCC also warns about function definitions that might be candidates for format attributes. I am looking at the 4.1.2 manual, and it isn't supported in that. –mjs Nov 20 '14 at 12:06 add a comment| up vote 2 down vote accepted I used the A non-static function declaration follows a static one. This is one of the more serious common warnings and it's definitely handy to make it into an error.

In a long sum, how can we find how many terms are preceded by the plus (or minus) sign Make all the statements true Karger's Algorithm question Why microcontroller takes many What would be the atomic no. when there is a return statement or a call to function declared with the noreturn attribute. -Wimplicit-fallthrough also takes into account control flow statements, such as ifs, and only warns when In C this warning is enabled by -Wall. -Wjump-misses-init (C, Objective-C only)Warn if a goto statement or a switch statement jumps forward across the initialization of a Next:Debugging Options, Previous:Language

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 Typically, the compiler warns if a const int (*)[] variable is passed to a function that takes a int (*)[] parameter. However, you can find such lists here, along with the tools used to generate them. –Kyle Strand Feb 28 at 18:50 add a comment| up vote 5 down vote I also It is not specified when between sequence points modifications to the values of objects take effect.

I found the shadowing one helpful, so it's not like they're useless just because they're turned off). –Mehrdad Jul 30 '12 at 3:35 add a comment| up vote 3 down vote The combined effect of positive and negative forms is that more specific options have priority over less specific ones, independently of their position in the command-line. Also note that some warnings are for the pre-processor, some for the actual compiler and some for the linker (which is a completely separate program, and found in the binutils package) To suppress this warning cast the expression to `void'. -WunusedAll the above -Wunused options combined.

A pointer is compared against integer zero with `<', `<=', `>', or `>='. This warning is also enabled by -Wextra. -Wignored-attributes (C and C++ only)Warn when an attribute is ignored. share|improve this answer answered Sep 30 '08 at 19:49 Nils Pipenbrinck 54.5k18120195 4 -Wextra seems to be the new name for -W (Which is also still supported) –Sard Sep 30 Not the answer you're looking for?

This is not equivalent to -Werror=pedantic, since there are errors enabled by this option and not enabled by the latter and vice versa. -WallThis enables all the warnings about constructions that Identifier conflicts with labels. It also suggests you hide directives like #pragma not understood by traditional C by indenting them. This warning is enabled by default. -Wshift-negative-valueWarn if left shifting a negative value.