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gcc change warning to error Vass, North Carolina

ISO C prohibits qualified void return types on function definitions, so such return types always receive a warning even without this option. That will 'continue' rather than stop. Watson Mar 10 '10 at 14:01 Well, I remember dealing with Ada for a brief time and, for me, the approach would have to be augmenting the build. 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.

gcc share|improve this question edited Jan 26 '09 at 7:10 Greg Hewgill 511k1088801044 asked Jan 26 '09 at 7:07 acidzombie24 42.9k137454817 add a comment| 2 Answers 2 active oldest votes up It can be disabled with the -Wno-nonnull option. -Winit-self (C, C++, Objective-C and Objective-C++ only)Warn about uninitialized variables that are initialized with themselves. asked 6 years ago viewed 27838 times active 3 years ago Get the weekly newsletter! I'll try some of the options you listed as well as others in this thread when I get home today, but I'm learning towards just using the Windows version since I

Traditional C lacks a separate namespace for labels. The formats are checked against the format features supported by GNU libc version 2.2. Such a type qualifier has no effect, since the value returned by a function is not an lvalue. (But don't warn about the GNU extension of volatile void return types. Apart from that, older versions of GCC only seem to provide the -Werror sledgehammer of making every last warning an error.

According to http://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html, -Wno-invalid-offsetof looks like the flag to hide it, but it doesn't gcc gcc-warning share|improve this question edited Aug 26 '10 at 12:18 skaffman 277k63618656 asked Jan 24 '09 Not the answer you're looking for? However, it has many false positives. Only warns when the converted pointer is dereferenced.

share|improve this answer answered Jun 26 '09 at 1:56 J Barlow add a comment| up vote 6 down vote Sounds like there are a bunch of other warnings that you don't up vote 20 down vote favorite 5 I get this warning from GCC: warning: cannot pass objects of non-POD type 'class Something' through '...'; call will abort at runtime It's pretty hexadecimal or octal values, which typically represent bit patterns, are not warned about. This warning is enabled by -Wall. -Wunused-but-set-parameterWarn whenever a function parameter is assigned to, but otherwise unused (aside from its declaration).

This analysis requires option -fipa-pure-const, which is enabled by default at -O and higher. The actual requirements may be somewhat greater than len even if you do not get a warning. Why must the speed of light be the universal speed limit for all the fundamental forces of nature? This construct is not accepted by some traditional C compilers.

This warning turns on -Wnarrowing and is enabled by -Wall. -Wc++14-compat (C++ and Objective-C++ only)Warn about C++ constructs whose meaning differs between ISO C++ 2011 and ISO C++ 2014. This includes an expression-statement or the left-hand side of a comma expression that contains no side effects. Level 3 (default for -Wstrict-aliasing): Should have very few false positives and few false negatives. This includes using logical operators in contexts where a bit-wise operator is likely to be expected. -Waggregate-returnWarn if any functions that return structures or unions are defined or called. (In languages

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. 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 Is not -ansi approximately the same thing as c89? Of course -Wall and -Wextra turn on the other options. -Wall -Wextra -Werror all always present as my options. –bolov Feb 2 '15 at 14:09 @bolov , i've fixed

This is one of the more serious common warnings and it's definitely handy to make it into an error. Initialization of automatic aggregates. Higher levels correspond to higher accuracy (fewer false positives). Adding '-Wextra' can spot some other problems too. –Jonathan Leffler Jul 6 '10 at 14:00 1 Also, it is a good idea to add -O3 or something similar; there are

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. If they're just warnings a developer may decide to leave one in because he's sure it's invalid. A non-static function declaration follows a static one. Hot Network Questions When to use "bon appetit"?

In traditional C, some preprocessor directives did not exist. 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 This warning is only issued if the base of the constant is ten. For example: (x * 10) / 5 is simplified to x * 2. -Wstrict-overflow=5Also warn about cases where the compiler reduces the magnitude of a constant involved in a comparison.

Warns about incomplete types. See Deprecated Features. -Wno-deprecated-declarationsDo not warn about uses of functions (see Function Attributes), variables (see Variable Attributes), and types (see Type Attributes) marked as deprecated by using the deprecated attribute. -Wno-overflowDo This is done under the assumption that the zero initializer in user code appears conditioned on e.g. __STDC__ to avoid missing initializer warnings and relies on default initialization to zero in If the initializer is zero, the warning is omitted.

Any space allocated via alloca, variable-length arrays, or related constructs is included by the compiler when determining whether or not to issue a warning. But, for most targets, it is made up of code and thus requires the stack to be made executable in order for the program to work properly. -Wfloat-equalWarn if floating-point values This option is independent of the standards mode. This option is not made part of -Wall because in a debugging version of a program there is often substantial code which checks correct functioning of the program and is, hopefully,

For example, an expression such as `x[i,j]' will cause a warning, but `x[(void)i,j]' will not. Usage of ISO string concatenation is detected. This warning is enabled by -Wall. -WunusedAll the above -Wunused options combined. This warning detects various mistakes such as: int i = 1; ...

When casting a cube spell on a hex grid do you pick a honeycomb for origin or an intersection for origin? In a long sum, how can we find how many terms are preceded by the plus (or minus) sign Appease Your Google Overlords: Draw the "G" Logo Word for someone who share|improve this answer edited Dec 16 '09 at 14:05 answered Dec 16 '09 at 13:51 Jonathan 762 add a comment| Your Answer draft saved draft discarded Sign up or log share|improve this answer answered Mar 10 '10 at 5:51 Jack 511 add a comment| up vote 3 down vote It seems -Werror flag is set in Makefile.

This is the warning level of -Wunused-const-variable and must be explicitly requested since in C++ this isn't an error and in C it might be harder to clean up all headers Is there any job that can't be automated? This option is also enabled by -Wconversion. -Wsizeof-pointer-memaccessWarn for suspicious length parameters to certain string and memory built-in functions if the argument uses sizeof. Not the answer you're looking for?

See Function Attributes. Therefore, seemingly insignificant changes in the source program can cause the warnings produced by -Winline to appear or disappear. -Wno-invalid-offsetof (C++ only)Suppress warnings from applying the `offsetof' macro to a non-POD If you want to entirely disable all warnings, use -w (not recommended). For ISO C, follows the version of the ISO C standard specified by any -std option used.