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Date: Mon, 28 May 2012 09:10:19 -0400
From: Rich Felker <dalias@...ifal.cx>
To: musl@...ts.openwall.com
Subject: Re: SIGILL when dynamic linking without
 -Wl,-Bsymbolic-functions

On Sun, May 27, 2012 at 09:52:56PM -0700, Isaac Dunham wrote:
> When -Wl,-Bsymbolic-functions is disabled in the makefile, musl
> cannot be used for dynamic linking.
> However, the -Bsymbolic-functions option was added in binutils 2.17.50
> (a CVS/git version, not a release); this was apparently just prior to
> the license switch.
> 
> As a result, it will be impossible to use Aboriginal Linux packages to
> generate a version capable of dynamic linking.
> 
> I'm pretty sure this used to work...but I don't remember when I tested
> it last. I think it was somewhere around 0.8.1-0.8.5.

It's always been this way. In principle -fvisibility=protected should
be able to do the same thing on earlier GCC's, but it doesn't work
right. You could also try -fPIE instead of -fPIC; that might work. As
a last resort, -Bsymbolic will work, but it will do too much and will
break any applications that access global vars in libc (like optarg,
environ, etc.).

I thought Rob said he was going to patch -Bsymbolic-functions into his
binutils, but I guess he never did...

Rich

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