Re: pic+64bit+sun assembler+unwind-tables => illegal cross section subtraction

[Andrew Pinski <pinskia at gmail dot com>]

Sent from my iPhone

On May 9, 2010, at 5:42 PM, Jay K <jay.krell@cornell.edu> wrote:

> I haven't tried 4.5.0 yet.
>
>
> -bash-4.1$ /opt/csw/gcc4/bin/g++ -v
> Using built-in specs.
> Target: i386-pc-solaris2.10
> Configured with: ../gcc-4.3.3/configure --prefix=/opt/csw/gcc4 -- 
> exec-prefix=/op
> t/csw/gcc4



> --with-gnu-as


You configured gcc to build with the gnu as but then run with it so  
what do you expect.


> --with-as=/opt/csw/bin/gas --without-gnu-ld --with-ld=/
> usr/ccs/bin/ld --enable-nls --with-included-gettext --with-libiconv- 
> prefix=/opt/
> csw --with-x --with-mpfr=/opt/csw --with-gmp=/opt/csw --enable-java- 
> awt=xlib --e
> nable-libada --enable-libssp --enable-objc-gc --enable-threads=posix  
> --enable-st
> age1-languages=c --enable-languages=ada,c,c++,fortran,java,objc
> Thread model: posix
> gcc version 4.3.3 (GCC)
>
>
> /opt/csw/gcc4/bin/g++ 1.cpp -fPIC -S -m64
>        "1.s", line 117 : Warning: Illegal subtraction - symbols from  
> different sections: ".LFB2", ".DOT-2"
>        "1.s", line 120 : Warning: Illegal subtraction - symbols from  
> different sections: ".LLSDA2", ".DOT-3"
> void F1();
> void F2()
> {
>  try { F1(); } catch(...) {F2(); }
> }
>
>
> /usr/ccs/bin/as -xarch=amd64 1.s
>
>
>
> or similar:
> -bash-4.1$ cat 2.c
> void F1() { }
>
>
>   /opt/csw/gcc4/bin/gcc -fPIC -S -funwind-tables -m64 2.c
>   /usr/ccs/bin/as -xarch=amd64 2.s
> Assembler: 2.c
>        "2.s", line 38 : Warning: Illegal subtraction - symbols from  
> different sections: ".LFB2", ".DOT-1"
>
>
> I'm aware of this thread:
> http://gcc.gnu.org/ml/gcc-patches/2006-07/msg00908.html
>
>
>
> I think I'll switch to GNU as, or omit -funwind-tables for now.
>  Or see if 4.5.0 fixes it.
> Sparc32, sparc64, x86 work.
>
>
> -gstabs+ also generated .stabd that Sun assembler didn't like.
> I switched to -gstabs.
> Maybe I messed up something though, as it looks like gcc is aware  
> not to output .stabd to non-gas.
>  More reason to use GNU assembler, understood.
>
>
> http://gcc.gnu.org/install/specific.html#ix86-x-solaris210
> could be a bit more precise:
> > > Recent versions of the Sun assembler in /usr/ccs/bin/as work  
> > > almost as well, though.
>
>
> "almost as well"?
> Maybe that should say more, like, use -g or -gstabs instead of - 
> gstabs+, don't use 64bit+pic+unwind-tables or 64bit+pic+exceptions
>
>
> I switched to Sun assembler because I'm seeing GNU as installed in  
> different places on different machines.
>  Some people don't install /usr/sfw and the install elsewhere.
>
>
> - Jay