On Wed, Jan 10, 2024 at 03:01:03PM +0000, Bruce Richardson wrote: > The default behaviour of "ld.lld" has changed, so it now prints out > warnings about entries in the version.map file which don't exist in > the current build. Since we use our version.map file simply to filter > out the functions we don't want made public, we include in it all > functions across all OS's and builds that we want public if present. > This causes these ld warnings to be emitted, e.g. on BSD, which is > missing functionality found on Linux. For example: > > * hpet functions in EAL > * regexdev enqueue and dequeue burst > * eventdev event_timer functions > > Easiest solution, without major rework of how we use our version.map > files, and without dynamically generating them per-build, is to pass > the --undefined-version flag to the linker, to restore the old > behaviour. > > Signed-off-by: Bruce Richardson <bruce.richard...@intel.com> > ---
Acked-by: Tyler Retzlaff <roret...@linux.microsoft.com> i don't know if has ever been discussed but a way to achieve a similar outcome would be to introduce a visibility macro allowing the data and function symbols to be explicitly made visible while making the build default hidden. https://gcc.gnu.org/wiki/Visibility on windows symbols are hidden by default (opposite of gnu toolchain) and allowing the symbols that are intended to be public be annotated in code with a macro instead of a separate map/def file would arguably appear more consistent. additionally, the current process of converting a map file to a def file for windows has limitations with respect to things like marking the type of symbol being exported. ty
