[RFC/PATCH] ldso: drop -Wl,-e,_start linking option

Mike Frysinger vapier at gentoo.org
Tue Mar 27 15:30:15 UTC 2012

On Tuesday 27 March 2012 10:35:42 Khem Raj wrote:
> On Mon, Mar 26, 2012 at 9:10 PM, Mike Frysinger wrote:
> > On Sunday 25 March 2012 23:00:59 Mike Frysinger wrote:
> >> it should be easy to add aliases via .set for both mips and blackfin
> >> (and prob h8300, although that doesn't have a ldso port) so _start ==
> >> __start. i don't think there would be runtime penalties for this as
> >> long as the symbol has hidden visibility.
> > 
> > ok, by keeping the -Wl,-e,_start and adding an alias to the Blackfin
> > code, everyone should be happy.  symbol aliases are free since we throw
> > away this symbol from the public ABI.  thanks guys!
> I use _start to stop gdb when debugging ld.so

yes, by hiding the symbol, the stripped version will no longer have it, and so 
you can't break on "_start" without loading debug/split symbols.  you still at 
least have via the address and the ELF's ehdr.  i think this is something we 
should be shipping with as every symbol that is exported from the ldso incurs 
additional runtime penalties.  and i think we all agree that the ldso should 
not be exporting a "_start" symbol.
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