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Animal Shelter in Java In what atmospheric densities or pressures have aerobrakings been performed? Comment 17 Lukas Slebodnik 2015-01-09 15:17:44 EST I'm able to reproduce bug even with gcc in fedora 21. Do you still think it is a problem in ccache? Each of these specific warning options also has a negative form beginning ‘-Wno-’ to turn off warnings; for example, -Wno-implicit.

However, I'm compiling with the ansi and pedantic flags--does this somehow exclude the strdup() from being #include'd when I include string.h? The precision of the warnings depends on the optimization options used. -Winit-self (C, C++, Objective-C and Objective-C++ only)Warn about uninitialized variables that are initialized with themselves. Ubuntu Logo, Ubuntu and Canonical Canonical Ltd. Why is water evaporated from the ocean not salty?

However, in the case of scanf formats, this option will suppress the warning if the unused arguments are all pointers, since the Single Unix Specification says that such unused arguments are GNU C assigns these types a size of 1, for convenience in calculations with void * pointers and pointers to functions. 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 actual requirements may be somewhat greater than len even if you do not get a warning.

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 I added my own answer by the way. –amn Oct 16 '11 at 11:45 add a comment| up vote 4 down vote From the gcc docs on warnings: -Wimplicit-function-declaration (C and Developing web applications for long lifespan (20+ years) How to show hidden files in Nautilus 3.20.3 Ubuntu 16.10? more hot questions question feed lang-c about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation

Guess you can strace it to see with what command line options it invokes gcc to preprocess the source, I bet it has some wrong -isystem somewhere, otherwise it wouldn't end 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, 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 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.

current community chat Unix & Linux Unix & Linux Meta your communities Sign up or log in to customize your list. If you would still like to see this bug fixed and are able to reproduce it against a later version of Fedora, you are encouraged change the 'version' to a later Approximately 4 (four) weeks from now Fedora will stop maintaining and issuing updates for Fedora 21. I've seen environments where strdup() was declared in stdlib.h instead of string.h where it was supposed to be.

A comparison like `x<=y<=z' appears; this is equivalent to `(x<=y ? 1 : 0) <= z', which is a different interpretation from that of ordinary mathematical notation. Comment 4 Lukas Slebodnik 2013-08-28 09:46:42 EDT I am not sure where problem is, because file can be compiled without problems on fedora 18 (with default version of ccache and backported 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 more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed

Adv Reply June 25th, 2012 #4 steeldriver View Profile View Forum Posts Private Message Staff Emeritus Join Date Apr 2012 Beans 6,826 Re: -Werror=implicit-function-declaration while compiling well then I don't This warning is more effective with link time optimization, where the information about the class hierarchy graph is more complete. -Wsuggest-final-methodsWarn about virtual methods where code quality would be improved if However, the standards committee have ruled that function calls do not overlap. GNU C assigns these types a size of 1, for convenience in calculations with void * pointers and pointers to functions. -Wbad-function-cast (C only)Warn whenever a function call is cast to

An optimization that assumes that signed overflow does not occur is perfectly safe if the values of the variables involved are such that overflow never does, in fact, occur. This enables all the warnings about constructions that some users consider questionable, and that are easy to avoid (or modify to prevent the warning), even in conjunction with macros. The restrictions on `offsetof' may be relaxed in a future version of the C++ standard. -Winvalid-pchWarn if a precompiled header (see Precompiled Headers) is found in the search path but can't Since input files now are combined in one compilation run, one ends up with a single object file, which has some implications of its own.

share|improve this answer edited Sep 21 '15 at 23:14 answered Sep 21 '15 at 20:27 Mark Plotnick 12.3k12345 add a comment| Your Answer draft saved draft discarded Sign up or How much interest should I pay on a loan from a friend? 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. A switch statement has an operand of type long.

This option implies -Wunused-const-variable=1 for C, but not for C++. This warning is also enabled by -Wall. -Wimplicit (C and Objective-C only)Same as -Wimplicit-int and -Wimplicit-function-declaration. This includes an expression-statement or the left-hand side of a comma expression that contains no side effects. This either is a gaping hole with C or I need to be corrected on exactly what am I doing/expecting wrong.

Use of ISO C style function definitions. Some of them warn about constructions that users generally do not consider questionable, but which occasionally you might wish to check for; others warn about constructions that are necessary or hard Since -Wformat also checks for null format arguments for several functions, -Wformat also implies -Wnonnull. c gcc share|improve this question edited Oct 11 '11 at 11:54 asked Oct 11 '11 at 10:17 amn 2,79332042 Doesn't answer the question, but using a C++ compiler (implicit

This warning is enabled by -Wall. -Wshift-count-negativeWarn if shift count is negative. This warning is also bypassed for nested functions because that feature is already a GCC extension and thus not relevant to traditional C compatibility. -Wtraditional-conversion (C and Objective-C only)Warn if a 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 Therefore, they do not occur for a variable that is declared volatile, or whose address is taken, or whose size is other than 1, 2, 4 or 8 bytes.

Comment 10 Lukas Slebodnik 2013-10-16 13:13:22 EDT According do previous comment 986923#c9, it doesn't seem to me that it is a problem in ccache. Anyways thanks for the implementation of strdup...I was afraid that I'd have to waste brain cells writing my own strdup 11-06-2007 #4 brewbuck View Profile View Forum Posts Officially An Architect This is often not what the programmer expected, as illustrated in the above example by indentation the programmer chose. When it sees you using the function before you've told the compiler that it exists, then you get this error/warning.

I generated preprocessed file: gcc -E -c -o ldap_id_postproc.c ldap_id.c If I try to compile ldap_id_postproc.c, then warnings are also ignored on virtual machine. Therefore -Wtraditional warns about directives that traditional C understands but ignores because the ‘#’ does not appear as the first character on the line. For example: switch (cond) { case 1: a = 1; break; case 2: a = 2; case 3: a = 3; break; } This warning does not warn when the last Is that not enough to convince you that non-standard features are, in fact, non-standard?

You can simply say void my_func(int); at the top of your code, and then the compiler will know what you mean when you call my_func later in your code, even if