[PATCH] shlib: Create a default symbol version on Linux-like ELF

[Eric Christopher]

Seems pretty reasonable, would probably be better as it's own flag
with filter though?

-eric

On Thu, May 29, 2014 at 8:00 AM, Adam Jackson <ajax at redhat.com> wrote:
> When apps or other libraries link against a library with symbol
> versions, the version string is recorded in the import table, and used
> at runtime to resolve the symbol back to a library that provides that
> version (vaguely like how two-level namespaces work in Mach-O).  ld's
> --default-symver flag tags every exported symbol with a symbol version
> string equal to the library's soname.  Using --default-symver means
> multiple versions of libLLVM can coexist within the same process, at
> least to the extent that they don't try to pass data between each
> other's llvms.
>
> As an example, imagine a language like Rust using llvm for CPU codegen,
> binding to OpenGL, with Mesa as the OpenGL implementation using llvm for
> R600 codegen.  With --default-symver Rust and Mesa will resolve their
> llvm usage to the version each was linked against, which need not match.
>
> (Other ELF platforms like BSD and Solaris might have similar semantics,
> I've not checked.)
>
> - ajax
>
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