gcc-warning

How to disable all warnings on a few lines of code. Specific warnings can be disabled using GCC diagnostic feature, but is there a flag for all warnings. I tried this way but it doesn't work #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-wall" // some code #pragma GCC diagnostic pop From here: http://dbp-consulting.com/tutorials/SuppressingGCCWarnings.html For version 4.6 or later, you can save the state of the user's diagnostic flags. You can insert this around the line that causes the spurious warning: #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wdeprecated

This question is about C++20's [[likely]] / [[unlikely]] feature, not compiler-defined macros. This documents ( cppreference ) only gave an example on applying them to a switch-case statement. This switch-case example compiles perfectly with my compiler (g++-7.2) so I assume the compiler has implemented this feature, though it's not yet officially introduced in current C++ standards. But when I use them like this: if (condition) [[likely]] { ... } else { ... } , I got a warning: "warning: attributes at the beginning of statement are ignored [-Wattributes]". So how should I use these attributes

I am getting: warning: assuming signed overflow does not occur when assuming that (X + c) < X is always false [-Wstrict-overflow] on this line: if ( this->m_PositionIndex[in] < this->m_EndIndex[in] ) m_PositionIndex and m_EndIndex of type itk::Index ( http://www.itk.org/Doxygen/html/classitk_1_1Index.html ), and their operator[] returns a signed long . (it is line 37 here: https://github.com/Kitware/ITK/blob/master/Modules/Core/Common/include/itkImageRegionConstIteratorWithIndex.hxx for context) Can anyone explain what would cause that warning here? I don't see the pattern (x+c) < x anywhere -

I am new to cmake and gcc. The first assignment in my new role in the company was to clean the errors from our linux compilation I did most of it, and now the only warning I see is cc1: warning: command line option ‘-std=c++11’ is valid for C++/ObjC++ but not for C [enabled by default] I want wither to suppress the warning or to solve the issue in the cmake file. Unfortunately, I still haven't found the correct -Wno-xxx statement that fits here. Thanks! Code issue warnings can be silenced with -Wno-xxx options because sometimes you don't have control over the source code. But a warning telling

I have a header file suppose abc.h, where i have function declaration as: static int function1(); I have included this header file in abc.c and has defined the function and used it. static int function1() { < function definition> } After compiling I am getting warning: warning: function1 declared static but never defined How can I remove warning, without removing static. Thanks. A static function can be declared in a header file, but this would cause each source file that included the header file to have its own private copy of the function, which is probably not what was intended. Are u sure