[dpdk-dev] [RFC] meter: fix ABI break due to experimental tag removal

[Bruce Richardson]

On Wed, Jan 29, 2020 at 12:29:53PM +0000, Ferruh Yigit wrote:
> Duplicated the existing symbol and versioned one as experimental and
> other as stable.
> 
> Created VERSION_SYMBOL_EXPERIMENTAL helper macro.
> 
> Updated the 'check-experimental-syms.sh' buildtool, which was
> complaining that the symbol is in EXPERIMENTAL tag in .map file but it
> is not in the .experimental section (__rte_experimental tag is missing).
> Updated tool in a way it won't complain if the symbol in the
> EXPERIMENTAL tag duplicated in some other block in .map file (versioned)
> 
> Updated meson build system to allow the versioning,
> 'use_function_versioning = true', not sure why it was disabled by
> default.
> 

Because when enabled everything in the library must be built twice - once
for static lib and differently for a dynamic lib. Therefore unless a
library actually needs versioned symbols, we only build everything once to
save on build time.

/Bruce