gcc treat specific warning as error Vickery Ohio

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gcc treat specific warning as error Vickery, Ohio

Therefore -Wtraditional warns about directives that traditional C understands but ignores because the ‘#’ does not appear as the first character on the line. On such a machine, doing computations using double values is much more expensive because of the overhead required for software emulation. c++ c warnings compiler-construction share|improve this question edited Dec 30 '08 at 9:39 asked Dec 30 '08 at 9:22 Juan 1 #warning is non-standard; I think #error is pretty universal, int a[2][2] = { 0, 1, 2, 3 }; int b[2][2] = { { 0, 1 }, { 2, 3 } }; This warning is enabled by -Wall. -Wmissing-include-dirs (C, C++,

For C, this warning also warns about incrementing or decrementing a boolean, which rarely makes sense. (In C++, decrementing a boolean is always invalid. Furthermore, the prior value shall be read only to determine the value to be stored.”. Conversions by prototypes between fixed/floating-point values and vice versa. This warning is for cases not covered by -Wno-pointer-sign, which warns for pointer argument passing or assignment with different signedness. -Wno-int-conversion (C and Objective-C only)Do not warn about incompatible integer to

This warning is enabled by -Wall. Very few programs actually rely on exact IEEE arithmetic. For further language-specific options also refer to C++ Dialect Options and Objective-C and Objective-C++ Dialect Options. However, only system header files should use these escape routes; application programs should avoid them.

up vote 38 down vote favorite 44 What compiler warning level do you recommend for different C/C++ compilers? For C++, a function without return type always produces a diagnostic message, even when -Wno-return-type is specified. share|improve this answer answered Sep 30 '08 at 19:44 Evan Teran 54.9k17141202 3 just a note -ansi overrides -std=c99 –Sard Sep 30 '08 at 19:45 1 Isn't -ansi equivalent if (flagA) foo (0); #if SOME_CONDITION_THAT_DOES_NOT_HOLD if (flagB) #endif foo (1); The warning is not issued after a #line directive, since this typically indicates autogenerated code, and no assumptions can be

In addition, any space allocated via alloca, variable-length arrays, or related constructs is not included by the compiler when determining whether or not to issue a warning. -Wno-free-nonheap-objectDo not warn when https://github.com/ggreer/the_silver_searcher2. To the degree it doesn't work best that way, it's usually a problem to be fixed, not a fundamental issue that COLE has discovered. tenfingers 951 days ago "-Winit-self" actually That's why I try to treat warnings as errors: most of the time, the compiler is right warning me, and if he isn't, I document it in the code and prepend

This was an example shown in some LLVM documentation as to why you should use signed loop variables. In what atmospheric densities or pressures have aerobrakings been performed? 5008 out of the box Appease Your Google Overlords: Draw the "G" Logo What kind of distribution is this? May still have many false positives (not as many as level 1 though), and few false negatives (but possibly more than level 1). To inhibit the warning messages, use -Wno-long-long. -Wvariadic-macrosWarn if variadic macros are used in pedantic ISO C90 mode, or the GNU alternate syntax when in pedantic ISO C99 mode.

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 Note the hyphen instead of equals sign -- it works for that specific case only and no others. How much is "a ladleful"? For disabling warning in code i use: #if defined(Q_CC_INTEL) #pragma warning( push ) #pragma warning( disable: 2021 ) #endif // some code #if defined(Q_CC_INTEL) #pragma warning( pop ) #endif share|improve this

The attributes currently supported are listed below. -Wsuggest-attribute=pure-Wsuggest-attribute=const-Wsuggest-attribute=noreturn Warn about functions that might be candidates for attributes pure, const or noreturn. You can switch the warning off for all characters by writing -Wnormalized=none. cov(x,y)=0 but corr(x,y)=1 In Harry Potter book 7, why didn't the Order flee Britain after Harry turned seventeen? Not the answer you're looking for?

I don't think it has any impact on performances however (especially as the debug information is put in a separate ELF section, either in a separate file, or mapped but "cold" 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 The compiler sees only the calls to setjmp. This construct, known from C++, was introduced with ISO C99 and is by default allowed in GCC.

However, in the case of scanf formats, this option suppresses the warning if the unused arguments are all pointers, since the Single Unix Specification says that such unused arguments are allowed. It doesn't run inside the aliasing machinery; it's just a cheap heuristic inside the C parser. 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 Pedantic warnings are also disabled in the expression that follows __extension__.

These warnings as well are possible only in optimizing compilation. Other than as expressed by the sequence point rules, the order of evaluation of subexpressions of an expression is not specified. However, if the -Wno- form is used, the behavior is slightly different: no diagnostic is produced for -Wno-unknown-warning unless other diagnostics are being produced. Currently equivalent to -Wformat -Wformat-nonliteral -Wformat-security -Wformat-y2k. -Wformat-nonliteralIf -Wformat is specified, also warn if the format string is not a string literal and so cannot be checked, unless the format function

The absence of these prototypes when compiling with traditional C causes serious problems. I.e. 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 GCC informs you when the offset of such a field has changed in GCC 4.4.

If a program breaks these rules, the results on any particular implementation are entirely unpredictable. To suppress this warning use the unused attribute (see Variable Attributes). Where are sudo's insults stored? Here is one example of how this can happen: { int x; switch (y) { case 1: x = 1; break; case 2: x = 4; break; case 3: x =

An alternative to increasing the size of the destination buffer is to constrain the range of formatted values. Some more complicated cases are not diagnosed by this option, and it may give an occasional false positive result, but in general it has been found fairly effective at detecting this Higher levels correspond to higher accuracy (fewer false positives). This warning is also enabled by -Wextra; to get the other warnings of -Wextra without this warning, use -Wextra -Wno-sign-compare. -Wsign-conversionWarn for implicit conversions that may change the sign of an

I'm not sure if -O3 imply -O2 or allow more warnings to be generated. –Offirmo Aug 21 '12 at 12:55 3 Skip -m64 if you are not in a 64-bit