[PATCH 00/15] use GCC/MSVC compatible __VA_ARGS__

[Thomas Monjalon]

12/02/2024 22:49, Tyler Retzlaff:
> MSVC does not support GCC args... forwarding of args replace
> with ... and __VA_ARGS__ when forwarding.  Both forms of
> forwarding are a compiler extension but the latter is supported
> by both MSVC and GCC.

You use the non-standard ", ## __VA_ARGS__"
which would not compile in pedantic modes,
and possibly with other compilers.

I remember a private chat where I recommended you to use this:

lib/eal/include/rte_common.h
/**
 * ISO C helpers to modify format strings using variadic macros.
 * This is a replacement for the ", ## __VA_ARGS__" GNU extension.
 * An empty %s argument is appended to avoid a dangling comma.
 */
#define RTE_FMT(fmt, ...) fmt "%.0s", __VA_ARGS__ ""
#define RTE_FMT_HEAD(fmt, ...) fmt
#define RTE_FMT_TAIL(fmt, ...) __VA_ARGS__

Why not using it?