Date: Mon, 28 May 2012 23:03:09 -0700 From: Isaac Dunham <idunham@...abit.com> To: musl@...ts.openwall.com Subject: Re: SIGILL when dynamic linking without -Wl,-Bsymbolic-functions On Mon, 28 May 2012 09:10:19 -0400 Rich Felker <dalias@...ifal.cx> wrote: > 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.). Won't build with -fvisibility=protected: /opt/musl/bin/ld: src/ldso/dynlink.lo: relocation R_386_GOTOFF against protected function `_dl_debug_state' can not be used when making a shared object /opt/musl/bin/ld: final link failed: Bad value collect2:ld returned 1 exit status make: *** [lib/libc.so] Error 1 Due to some sort of memory lapse, I also tried -fvisibility=hidden. As might be expected, this did not work (segfault). -fPIE does not work (Illegal instruction) I guess I have to see if I can coerce autoconf into working properly. I have makeinfo installed, but the check in binutils-2.17.50-x doesn't recognize it... > I thought Rob said he was going to patch -Bsymbolic-functions into his > binutils, but I guess he never did... He said it was on his todo list (in the 50's)...which AFAIK means "maybe in a year or two, if that soon".
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