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gcc compiler error list Verdunville, West Virginia

Last edited by Dave_Sinkula; 10-03-2007 at 02:00 PM. I was just hoping there was a good resource like the MSDN for gcc, just in case I get a tougher error later... 10-04-2007 #12 Prelude View Profile View Forum Posts The problem encountered is that the character `\z' is not a known escape sequence. Error: invalid use of undefined type ‘struct Foo’ Error message: invalid use of undefined type ‘struct Foo’.

current community chat Stack Overflow Meta Stack Overflow your communities Sign up or log in to customize your list. Apparently, there is a std::count function that confuses the compiler to produce this rather cryptic error message. This also keeps me from having to type the word, which could result in my correctly spelling the variable name. Linker Errors Once you've finally cleaned up all those frustrating syntax errors, taken a nap, had a meal or two, and mentally prepared yourself for the program to build correctly, you

Unfortunately, this can be very hard to see since the mind typically reads what it expects rather than what is actually there. If the program is multi-function and/or multi-file, then each different function/file containing errors will be listed separately. Warning: cannot pass objects of non-POD type ‘struct std::string' through ‘…' Warning message: cannot pass objects of non-POD type 'struct std::string' through '...'; call will abort at runtime. Reply Bill says: April 27, 2015 at 17:36 Hi, I received "error: expected unqualified-id before ‘->' token".

All the warnings I've gotten so far were pretty easy to understand and fix. For example, prog.c:3: warning: unknown escape sequence `\z' indicates that a problem was encountered at line 3 of the program file prog.c. warning: passing arg of ... The ASCII code for newline can be found using char c = '\n'; Similar errors can occur with misuse of the macro NULL, #include int main (void) { int i

Is there a role with more responsibility? You may have issues with how you set up your compiler. For example, prog.c: In function `main': indicates that the error was encountered in the program file prog.c, and specifically in function main. Yeah, I usually get pretty good answers too; I just didn't want to waste people's time asking a question if there was a good site available where I could find the

You might also have a semi-colon (;) missing at the end of the previous statement. Many warnings are issued only if you ask for them, with one of the -W options (for instance, -Wall requests a variety of useful warnings). You might also try tweaking command-line options, particularly ones related to optimization. Fortunately, it's pretty clear that the function definition for foo was OK; this tells us that the error must have been caused somewhere else in the program.

You are, for instance, trying to print a C++ std::string directly to printf. Why would the end of the file be "unexpected"? This can make it very hard to debug. 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

The warning/error lines following the function/program file identification line is a record of the program file containing the error; the line number in the source file at which the error occurred; Check to make sure that you did not forget to send a format string to printf or scanf. Please don't PM me for help - and no, I don't do help over instant messengers. 10-03-2007 #6 Prelude View Profile View Forum Posts Visit Homepage Code Goddess Join Date Sep As you are using a forward declared type, GCC cannot tell if FooClass inherits the class implementing foo.

Often times, you can actually point out exactly where the variable was declared! Would you like to answer one of these unanswered questions instead? Is there any way to know when NOT to use my Oyster card? Error: undefined reference to ‘FooClass::foo()' Error message: undefined reference to 'FooClass::foo()'.

Are there any rules or guidelines about designing a flag? In it, you'll get: The week's top questions and answers Important community announcements Questions that need answers see an example newsletter By subscribing, you agree to the privacy policy and terms If you're faced with a list of fifty or sixty error and warning messages, it can be daunting to even try to figure out where to start. More cryptic was another error message from the same compilation attempt: "extraneous 'int' ignored".

Example: #include int main (void) { printf ("Hello World!\n); /* no closing quote */ return 0; } The opening quote for the string in this program does not have a This error will cause you no end of trouble. I think that the best way to learn about GCC's warnings is to do what the previous posters in this thread suggested. The signals keyword is really just a define of protected.

character constant too long In C and C++ character codes are written using single quotes, e.g. 'a' gives the ASCII code for the letter a (67), and '\n' gives the ASCII Anyone Understand how the chain rule was applied here? Now compile the code by providing opt_file along with option @. $ gcc main.c @opt_file main.c: In function ‘main’: main.c:6:11: warning: ‘i’ is used uninitialized in this function [-Wuninitialized] $ ls Errors are conditions that prevent the compiler from completing the compilation of your files.

Interpret char as unsigned char using -funsigned-char option Through this option, the char type is treated as unsigned type. Warnings may indicate danger points where you should check to make sure that your program really does what you intend; or the use of obsolete features; or the use of nonstandard This is not the case for linker or compiler errors. Ignoring this warning can give you random values in a variable, causing the potential bug to appear sometimes, but not always.

quaere et invenies. "Simplicity does not precede complexity, but follows it." -- Alan Perlis "Testing can only prove the presence of bugs, not their absence." -- Edsger Dijkstra "The only real Sometimes GCC emits something that can be described as Haiku poems - and you have no clue as to what it really is complaining about. You have called the function XXXXX. For instance if you have char name[20]; make sure that you do not do something like name[25] = 'n'; When we learn about pointers you will understand segmentation faults much better.

This message can appear if you have forgotten a SIGNAL() or SLOT() macro when calling QObject::connect or a similar function. A sometimes subtle error is when the linker complains about there being more than one definition for a class, function, or variable. To understand the complete compilation process of a GCC compiler, read our article Journey of a C Program to Linux Executable in 4 Stages. 2. They didn't look that hard: http://gcc.gnu.org/onlinedocs/gcc-4.2.1/gcc.pdf page 40 or so starts listing the options for what warnings you can enable/disable with -Wsomething.

I'm using GMail as e8johan. If you get one of these errors check to make sure that you have written the function and that you have spelled the function name correctly. Valid escape sequences are: \n newline \t tab \b backspace \r carriage return \f form feed \v vertical tab \a alert (bell) The combinations \\, \', \" and \? Error: invalid operands of types `const char[31]' and `const char[7]' to binary `operator+' Error message: invalid operands of types `const char[31]' and `const char[7]' to binary `operator+'.

The operator '=' both assigns and returns the value of its right-hand side, causing the variable i to be modified and the unexpected branch taken. Note that because this is only a warning the compiler will generate an a.out file. Example: #include int main (void) { printf ('Hello World!\n'); /* wrong quotes */ return 0; } The program above confuses single-quotes and double-quotes. For instance, the statement "for(;)" isn't correct syntax because a for loop always needs to have three parts.

The problem is often that the variable is simply misspelled. This issue can come up in one of several ways: first, there might actually be two definitions of an object--for instance, two global variables both declared as external variables to be Here is an example : #include int main(void) { char c = -10; // Print the string printf("\n The Geek Stuff [%d]\n", c); return 0; } When the above code is