代码块-混合C和C ++文件

Question

So far I've been working with g++ (on Windows), but for some reasons I want to use Code:Blocks to use sfml library (quite easy configuration, contrary to clean g++).

I use bison to create file.tab.c and file.tab.h (from file.y), I use flex for lex.yy.c (from file.l) and i have my own files containing functions needed for my project (file.cpp and file.h). So with g++ I compile it like that:

g++ lex.yy.c file.tab.c file.cpp -o file.exe

and it works fine. Now i want to compile these files with Code:Blocks and i get a strange error:

file.l:4:18: fatal error: cstdio: No such file or directory

Why on earth does it signal an error in file.l when this file isn't even included to my project (it just served to create lex.yy.c which i attached to project)? And I'm not sure about that but... main() is in file.tab.c so this is an entry point - can I specifically ask Code:Blocks to compile everything with g++ like I did in command line and there would be a chance for it to work? I have the latest version of Code:Blocks. Thanks in advance

//Edit: I can also add that i get the same error when i compile it from command line like that: gcc lex.yy.c.

Answer 1

To make all the source files in a C::B project be compiled as C++, regardless of file extension and regardless of whether gcc or g++ is invoked, add the option -x c++ in YourProject -> Build options... -> Compiler settings -> Other options .

That forces C++ compilation and should solve your problem, but just in case it is not clear to you, the error:

fatal error: cstdio: No such file or directory

is occurring because the C++ header <cstdio> is being #include -ed in a compilation that is being compiled as C, and that header is not in the C compiler's include-search paths.

The C compiler is being chosen based on the file extension ( .c ) of the file being compiled when the error occurs. The -x c++ option overrides this, but you might look for a better solution by investigating how it happens that a C++ header is getting included in a C source file, and correcting that if you can.

The C header equivalent to <cstdio> is <stdio.h> . Can you fix the problem simply by changing <cstdio> to <stdio.h> somewhere? If you use the -x c++ solution then it stops you from ever adding a source file to the project that should be compiled as C.

Answer 2

Check whether all the standard library files are all included in your project; For help on linking files, refer this .

It could be more better if you include more details.