See comment 24 in the bug for details on what can go wrong without this
change. This change ensures system libraries are not going to pick
symbols from mozglue when running processes outside dalvik.
As a side effect, this makes things kind of closer to what happens when
dalvik is involved, exposing unit tests to possible allocator mismatches
that could happen like bug 1531887.
On the flip side, libraries that link against mozglue explicitly are
going to get a reference to the versioned symbols, so everything is fine
in that regard. The custom linker, however, will ignore the versions
altogether, and its symbols resolution just ends up unchanged. So we're
fine there too.
We use something that is close to what using a SYMBOLS_FILE would
generate as a version script, but we need to do so manually because
SYMBOLS_FILE doesn't support exporting all the symbols.
Differential Revision: https://phabricator.services.mozilla.com/D28030
--HG--
extra : moz-landing-system : lando
a58ba7930b