Re: [preprocessor] Dropping support for compilers that do not implement variadic macros

From: Edward Diener (eldiener_at_[hidden])
Date: 2020-09-18 01:07:38

On 9/17/2020 7:08 PM, Gavin Lambert via Boost wrote:
> On 18/09/2020 10:10, Joaquín M López Muñoz wrote:
>>> I did discover that if gcc or clang is compiled at the C++03 level 
>>> with -pedantic there will be a ton of warnings, and if with 
>>> -pedantic-errros there will be a ton of errors for those warnings.
>>
>> Don’t warning disabling pragmas *around preprocessor definitions* 
>> solve the issue?
> 
> Depends on the specific warnings.  Often the disables are needed at the 
> call site instead or in addition.
> 
> I've also seen some warnings raised by template code that are 
> essentially impossible to pragma away (without disabling for the entire 
> translation unit) as they get attributed to the instantiation "line" 
> outside of all user code.  Those are especially annoying.

As you presciently guessed it is impossible to change a "-Wpedantic" to 
either a "warning" if -pedantic-errors is specified or to an "ignore" if 
either -pedantic or -pedantic-errors is specified. I tried:

#pragma GCC diagnostic ignore "-Wpedantic"

or

#pragma GCC diagnostic warning "-Wpedantic"

and neither does anything.