https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92572
Alexander Monakov <amonakov at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |amonakov at gcc dot gnu.org
--- Comment #2 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Please show output of 'cc -v' and attach assembly for main.cc.
Providing vague linkage semantics with dynamic linking is a tricky area,
especially when dlopen is in play, moreso with RTLD_LOCAL as in this example.
For example, if you wanted vague-linkage objects to be unified across multiple
dlopen'ed libraries (each with RTLD_LOCAL), you'd need special support from the
toolchain and the dynamic linker. At some point GNU toolchain invented a new
special ELF symbol binding type, STB_GNU_UNIQUE, but it turned out to cause
other issues. It can be disabled in the compiler with
--disable-gnu-unique-object, in which case the outcome you show here is
expected.
I think on non-GNU systems you'll likely get "1" rather than "2".
