The #pragma once directive, once present in a file. The triangle and the square are included too in the main.cpp, therefore the Vertex.h file would be included. Warning: #pragma once in main file We're running our headers through clang to get a partial AST. Is it possible to disable that warning? Trou Program Bewoording here.

When I open any header with `#pragma once` - the code analyzer (or some other stuff) shows me the warning: '#pragma once in main file'. In the C and C++ programming languages, #pragma once is a non-standard but widely supported preprocessor directive designed to cause the current source file to be.

I am using #pragma once in my.cpps and.hpps and because of that I get a warning for each file that uses it. I have not found any option to disable this kind of warning, only the thing of #ifndef MY_FILE_H #define MY_FILE_H /*.*/ #endif. So would you recommend me to replace each #pragma once with ifndefs? In header: #define MYFILE_H // all the header and in the other files: #ifndef MYFILE_H #include 'myfile.hpp' #endif // the rest of the file What do you think, is it better to use it like this? Or there is an option to disable the #pragma once warnings in GCC, that I do not know? Zip Code For Frankfurt Am Main. There were old versions of GCC that complained about pragmas that it didn't know about. The C99 and C11 standards require (ISO/IEC 9899:2011 §6.10.6 Pragma directive): Any such pragma that is not recognized by the implementation is ignored.

Since pragmas cause problems for you, especially if the compiler doesn't recognize it and you include the header more than once, but the header guards work everywhere, use the header guards. Compilers are normally clever enough to spot the header guards. – Apr 17 '14 at 14:22 •.