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For future reference, I did try clang++ and was most pleasantly surprised by the much cleaner compiler output :) thanks! –slezica Feb 15 '12 at 20:48 You're welcome :). SebastianKrysmanski • Articles, Software Development • C++, C++ annoyances No comments yet Leave a Reply Cancel reply Your email address will not be published. A class name is unknown. The quality of error messages has been the subject of jokes for decades.

up vote 14 down vote favorite 4 C++ templates are notorious for generating long, unreadable error messages. Error message: cannot convert `Foo' to `Foo*' in initialization. up vote 34 down vote GCC as of 4.9 has colourized output ☺ Append the following to your bashrc/zshrc/whatever. As far as the "output" of gcc (g++) I am guessing you're not complaining about the compiled binaries :) share|improve this answer answered Apr 20 '11 at 15:12 Edwin Buck 45.3k25191

You cannot write "foo" + "bar", instead write "foo" "bar" (the split could be across a line-break). Range information is very useful for cases involving precedence issues and many other cases. $ gcc-4.9 -fsyntax-only t.c t.c: In function 'int f(int, int)': t.c:7:39: error: invalid operands to binary + What do I do when two squares are equally valid? Book of zen kōans Animal Shelter in Java more hot questions question feed default about us tour help blog chat data legal privacy policy work here advertising info mobile contact us

gcc is a tad better by virtue of printing the second error message which at least hints of the real problem, but neither compiler tell us what the problem is: "missing This is my blog and you'll find most of my articles here. It's high time that vendors concentrated on doing that job a bit better -- though I'll openly admit that when I've written compilers, I had a strong tendency toward treating it In the example above, we tell you what the inferred types are for the left and right hand sides, and we don't repeat what is obvious from the point (e.g., that

Function overloading can provide lots of candidates for what a particular function call might refer to, and some compilers (e.g., gcc) dutifully list them all when there's an ambiguity. share|improve this answer edited Jan 22 '14 at 17:25 answered Jan 20 '14 at 2:01 Gilson 466411 add a comment| Your Answer draft saved draft discarded Sign up or log Ignoring this warning can give you random values in a variable, causing the potential bug to appear sometimes, but not always. What actually are virtual particles?

You can create symlinks to it named gcc, g++, etc so that it always gets used whenever you run a compiler command (provided you setup the paths in the colorgcc script This is not as colorful as ColorGCC, just the words error, warning and note are colored and the location of the error in the source line is indicated in color. The following simple example shows how Clang helps you out by automatically printing instantiation information and nested range information for diagnostics as they are instantiated through macros and also shows how Also, checking at runtime means that the program will stop on the first error it encounters, only displaying a single message.

Why do some C++ template error messages literally cause my console window to scroll for over 5 seconds? Exploded Suffixes What would be the atomic no. Warning: Control reaches the end of a non-void function Warning message: Control reaches the end of a non-void function. What sense of "hack" is involved in "five hacks for using coffee filters"?

I'm using GMail as e8johan. The following example shows where it is important to preserve a typedef in C. $ clang -fsyntax-only t.c t.c:15:11: error: can't convert between vector values of different size ('__m128' and 'int Easily giving you a long cascade of error messages when it's in some Template that is used by the Template.All of the sudden you have to look at implementation details of However, sometimes very simple typedefs can wrap trivial types and it is important to strip off the typedef to understand what is going on.

Posted on 2014-01-27Author mortenwCategories General Post navigation Previous Previous post: Spreadsheets and the Command LineNext Next post: Writing Tests is Humbling Proudly powered by WordPress current community chat Stack Overflow Meta Right now you have two options Perl script or GilCC and if you work with Ruby you will like GilCC. You might be able to work around the compiler bug by re-working your code, but it's not at all obvious how. They both stink.

In the following somewhat nonsensical example you can see that you don't even need to see the original source code to understand what is wrong based on the Clang error. And then you start looking where you missed a ;. Also received "error: expected unqualified-id before ‘.' token. C++ templates are the worst thing ever for debuggability.

run touch foo.pro from the command line. 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+'. As a bonus, clang colorizes it's output by default (assuming you set the CXX=clang in your makefile). Syntax error?

Also, Clang's diagnostic is colored by default, making it easier to distinguish from nearby text. Thanks to Diederik. Bishop 3,6682022 4 and compile with -fdiagnostics-color or -fdiagnostics-color=ALWAYS if you're running through a piped build system. –Qix Jul 7 '14 at 4:19 add a comment| up vote 11 down You need to include the header file containing the declaration of FooClass.

Send to Email Address Your Name Your Email Address Cancel Post was not sent - check your email addresses! export GCC_COLORS='error=01;31:warning=01;35:note=01;36:caret=01;32:locus=01:quote=01' share|improve this answer edited Jul 5 '14 at 6:48 answered Oct 27 '13 at 9:42 David C. Also, see the relevant GCC documentation. This page is a collection of such gems, their meaning in English and how to solve the problem.

Related 23How to make G++ preprocessor output a newline in a macro?3Compiler chooses the wrong operator<<-1cannot get the right output of a recursive function1033Image Processing: Algorithm Improvement for 'Coca-Cola Can' Recognition21Why share|improve this answer answered Apr 21 '11 at 4:26 Jerry Coffin 33.6k456130 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google 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. You might also try tweaking command-line options, particularly ones related to optimization.

To show the template structure more clearly, the templated type can also be printed as an indented text tree. If you cannot find an actual problem, and touch does not work, try running make distclean && qmake && make to do a clean rebuild. Try our newsletter Sign up for our newsletter and get our top new questions delivered to your inbox (see an example).