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

From: Peter Dimov (pdimov_at_[hidden])
Date: 2020-09-18 01:46:50

Edward Diener 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. 
> The main culprits, for C++03 at the pedantic level, are that variadic 
> macros are not supported and that empty macro arguments are undefined.

Note that empty arguments for __VA_ARGS__ aren't allowed by C99, so 
clang -pedantic warns about them even in C++20 mode (even though C++20 has 
__VA_OPT__.)

<source>:3:4: warning: must specify at least one argument for '...' 
parameter of variadic macro [-Wgnu-zero-variadic-macro-arguments]

clang -pedantic is way too pedantic, if you ask me.