[Bug gprof/28962] libcollector: Error: invalid attempt to declare external version name as default in symbol `posix_spawn@@GLIBC_2.15

[joseph at codesourcery dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=28962

--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot 
com> ---
Code defining versioned symbols should use the symver attribute to define 
those symbols when available (when compiling with GCC 10 and later), 
instead of inline asm, to be compatible with LTO (it probably can't work 
very reliably with LTO when built with older compilers).  (Note: I haven't 
tested whether using the attribute actually helps here, but I expect it to 
be necessary.)

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