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gcc make warning error Voorheesville, New York

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 Luc Danton provided a great example of useless warnings from -Waggregate-return that almost certainly never makes sense for C++ code. In traditional C macro replacement takes place within string literals, but in ISO C it does not. 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.

I have more warnings from the Ada compiler, but I'll tread along now! –Dr. Specifically, a warning is issued for if, else, while, and for clauses with a guarded statement that does not use braces, followed by an unguarded statement with the same indentation. You'd think -Wextra might do the trick, but nope! Do you really want a warning for writing int inc(int i) { return i+1; } ?

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. This also enables some language-specific warnings described in C++ Dialect Options and Objective-C and Objective-C++ Dialect Options. -Wall turns on the following warning flags: -Waddress -Warray-bounds=1 (only with -O2) -Wbool-compare -Wbool-operation Not the answer you're looking for? If n is 0 (the default), there is no limit on the number of error messages produced.

Can a GM prohibit a player from referencing spells in the handbook during combat? Browse other questions tagged c gcc compiler-warnings or ask your own question. Macro parameters that appear within string literals in the macro body. These warnings are possible only in optimizing compilation, because they require data flow information that is computed only when optimizing.

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 A non-static function declaration follows a static one. not live in memory as the runtime does not touch it]) bjerun 951 days ago -Wl,-O1 Did you know that you also have an optimization flag for the linker ? Traditional C lacks a separate namespace for labels.

It is included in -Wall. -WallAll of the above `-W' options combined. These warnings will help you find at compile time code that can try to write into a string constant, but only if you have been very careful about using const in Note that there may be no warning about a variable that is used only to compute a value that itself is never used, because such computations may be deleted by data GCC guesses that format attributes might be appropriate for any function that calls a function like vprintf or vscanf, but this might not always be the case, and some functions for

Make all the statements true Meaning of "oh freak" Can cats leave scratch marks on cars? Win-win. DannyBee 951 days ago 2. 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 Does not warn about incomplete types. -Wstrict-overflow-Wstrict-overflow=nThis option is only active when -fstrict-overflow is active.

If this command-line option is used, warnings are even issued for unknown pragmas in system header files. n+1 will overflow. detrino 949 days ago Right, but the same is true of signed as well. DannyBee 949 days ago The issue i raised is that you replaced Now it's a warning without a double parenthesis, because it's also common the typo of using = instead of ==.The list goes on and on. Flags -Wlong-long and -Wno-long-long are taken into account only when -pedantic flag is used. -Wdisabled-optimizationWarn if a requested optimization pass is disabled.

I'm a big fan of how the functional languages I've gone further than dabbling in are very pushy about covering all cases for pattern matches (basically switch on steroids), even if This is reported only at the highest warning level because this simplification applies to many comparisons, so this warning level gives a very large number of false positives. -Wsuggest-attribute=[pure|const|noreturn|format]Warn for cases This includes conversions between real and integer, like abs (x) when x is double; conversions between signed and unsigned, like unsigned ui = -1; and conversions to smaller types, like sqrtf instead of -Wunused you can use -Wunused-but-set-variable -Wunused-but-set-parameter to only get some of the -Wunused warnings.) What exactly are you complaining that they don't bother to do? –Jonathan Wakely Jul 30

Note these are only possible candidates, not absolute ones. Then compare those with the lists under -Wall and -Wextra. Uh, no. Personal Open source Business Explore Sign up Sign in Pricing Blog Support Search GitHub This repository Watch 175 Star 1,377 Fork 399 openscad/openscad Code Issues 393 Pull requests 55 Projects

However, the standards committee have ruled that function calls do not overlap. However, it has many false positives. A variable might be changed by `longjmp' or `vfork'. This is often not what the programmer expected, as illustrated in the above example by indentation the programmer chose.

Start by looking for that. After looking around, there seems to be a wealth of flags to control warnings while compiling Ada code. It's as simple as that. –Mehrdad Jul 30 '12 at 5:00 6 @JoachimPileborg: "What is it you want the compiler to warn about?" Potential errors and/or bad style? 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

Why isn't this an error? GCC will guess that format attributes might be appropriate for any function that calls a function like vprintf or vscanf, but this might not always be the case, and some functions The C++17 standard will define the order of evaluation of operands in more cases: in particular it requires that the right-hand side of an assignment be evaluated before the left-hand side, This warning is enabled by -Wall. -Warray-bounds=1This is the warning level of -Warray-bounds and is enabled by -Wall; higher levels are not, and must be explicitly requested. -Warray-bounds=2This warning level also

You signed in with another tab or window. Either they fix it or they accept the blame for not doing so, but it's not up to me to fix it for them, OSS be damned. –DevSolar Jul 30 '12 On x86 I additionally use: -mregparm=3 since it saves a lot of space and helps benchmarks. astrange 951 days ago For any benefit you'd get from -mregparm, you'd get a wflags.gcc.base := -Wall -Wextra wflags.gcc.4.7 := -Wzero-as-null-pointer-constant wflags.gcc.4.8 := $(wflags.gcc.4.7) wflags.clang.base := -Wall -Wextra wflags.clang.3.2 := -Weverything CFLAGS += $(wflags.$(compiler_name).base) $(wflags.$(compiler_name).$(compiler_version)) share|improve this answer edited Sep 22 '15 at 12:15 answered

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, 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 Interesting to see their rationale. Maybe you can look for CFLAGS options in Makefile and remove the -Werror flag.

As a result, you may get a warning even when there is in fact no problem because longjmp cannot in fact be called at the place which would cause a problem. For instance, -gnatwF will Suppress warnings on unreferenced formals according to this guide. Are the words "expression" and "term" interchangeable in programming language theory? For C++, a function without return type always produces a diagnostic message, even when -Wno-return-type is specified.

of the atom whose 1s electron moves nearly at the speed of light? main should be a function with external linkage, returning int, taking either zero arguments, two, or three arguments of appropriate types.