Using [[deprecated]] attribute when warnings are errors (-Werror)

user_6672815 0
Viewed 7647

I'm migrating to C++14 and keen to adopt its [[deprecated]] functionality, e.g. 

#include <string>
#include <iostream>

[[deprecated]]
int f() { return 42; }

int main()
{
  std::cout << f() << std::endl;
}

compiled with 

g++ example.cpp -std=c++14 -Werror

and the problem is the deprecated warning is promoted (demoted?) to an error and the build fails.

Obviously using a #pragma to silence the warning completely defeats the point. Is there any way to tell g++ to emit warnings yet exclude specific ones from being treated as errors?

c++14 compiler-errors g++ compiler-warnings c++
2 Answers

You need to add

-Wno-error=deprecated-declarations

to tell gcc to keep deprecated-declarations as a warning instead of making it an error.

You can add additional

-Wno-error=name_of_warning

if you have additional warnings that you would like to not be treated as errors as well.

user_43424980

With GCC (And also Clang) you can disable errors for specific warnings.

Using -Wno-error= followed by the name of the warning (displayed together with the warning or error) will disable the error for that specific item.

For your case with [[deprecated]], use the option -Wno-error=deprecated-declaration, and those will become warnings again instead of errors.

user_4405580
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