Add support for --(no-)undefined-version
#18486
Merged
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Closes #16855 (main issue)
Closes #17326 (abandoned PR)
Closes #18255 (forked PR)
Adds support for the
--(no-)undefined-version
option, which permits/forbids references to undefined symbols in version scripts. The default is--no-undefined-version
.I squashed the commit history and added linker tests (with
use_lld = true
for now), as was requested by #17326 (comment)