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binutils 2.31 is going to change how shared libraries are linked, such that they always provide their own local definitions of the _end, _edata and _bss_start symbols. This would all be fine, except for shared libraries that export all symbols be default. (Rather than just exporting those symbols that form part of their API). According to binutils developers, we should only export the symbols we explicitly want to be used. We don't use this principle for all our libraries and deliberately don't want to have ABI versioning control for all of them, so the change I introduce here is to explicitly mark those symbols that will always be added by default linker configuration with binutils 2.31 as local. Right now these are '_end', '_edata', and '__bss_start' symbols. Fixes: https://bugzilla.samba.org/show_bug.cgi?id=13579 Cherry-picked from commit 4e123c46820e737968fa3d1c594aa016cca39637 Signed-off-by: Alexander Bokovoy <ab@samba.org> Reviewed-by: Andrew Bartlett <abartlet@samba.org>