Re: [patches] Make --disable-versioning work in EGLIBC

[Maxim Kuvyrkov <maxim@xxxxxxxxxxxxxxxx>]

Maxim Kuvyrkov wrote:

...

> The remaining differences in API are the following ('Missing' means that 
> the default configuration provides the symbol, but --disable-versioning 
> configuration does not):

I forgot to mention an issue which occured only on powerpc; 
unfortunately, I didn't solve this problem completely:

7. Certain symbols, which are defined in sysdeps/ieee754/ with 
default_symbol_version have different binding when EGLIBC is built 
without symbol versioning.  These symbols use global binding instead of 
weak binding.

This problem is due to the fact that .symver copies weakness from 
original symbol to versioned alias, but there is no way in GNU binutils 
to otherwise create an alias to a symbol preserving weak binding.  Lack 
of such functionality does not allow to automatically set correct 
binding on symbol aliases when not using symbol versioning.

Current patch somewhat fixes this by adding __attribute__((weak)) to 
several identified occurrences of the problem.  This workaround cannot 
guarantee, though, that all instances are fixed.

A proper way would be to add necessary functionality to copy symbol 
weakness to binutils GAS.  E.g., .ifweak directive would be enough to 
handle this issue.

--
Maxim