what is the difference between the two command?

[Anuz Pratap Singh Tomar]

On Mon, Jan 21, 2013 at 1:01 AM, horseriver <horserivers at gmail.com> wrote:

> On Sun, Jan 20, 2013 at 09:07:15AM -0800, Ian Lance Taylor wrote:
> > On Sat, Jan 19, 2013 at 1:30 PM, horseriver <horserivers at gmail.com>
> wrote:
> > > On Sat, Jan 19, 2013 at 09:47:53PM -0800, Ian Lance Taylor wrote:
> > >> On Fri, Jan 18, 2013 at 10:19 PM, horseriver <horserivers at gmail.com>
> wrote:
> > >> > hi:
> > >> >
> > >> >    Here are two command for producting one .so file :
> > >> >
> > >> >    1. gcc  -nostdlib -Wl,-T,vsyscall.lds vsyscall-int80.o -o
> vsyscall-int80.so
> > >> >
> > >> >    2. ld  -T vsyscall.lds vsyscall-int80.o -o vsyscall-int80.so
> > >>
> > >> There is no substantive difference between these commands.  There are
> > >> various minor differences that probably don't matter.  Use the -v
> > >> option when invoking gcc to see precisely how it invokes the linker.
> > >>
> > >> In particular, invoking the linker via the gcc driver will cause some
> > >> C++-specific operations to occur when needed, but since you aren't
> > >> using C++ in this case they won't happen.
> > >
> > > Thanks!
> > >
> > >    I have a weird problem here!
> > >
> > >    When I type the 1  to make vsyscall-int80.so ,ld report error: Not
> enough room for program headers, try linking with -N
> > >
> > >    But,When I type 2  to make vsyscall-int80.so,it works successfully.
> > >
> > >     What is the reason?
> >
> > I don't know.  Run the complete gcc command with the -v option and you
> > will see precisely how it invokes the linker.
>
>    gcc -v
> Using built-in specs.
> Target: i486-linux-gnu
> Configured with: ../src/configure -v --with-pkgversion='Debian 4.4.5-8'
> --with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs
> --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr
> --program-suffix=-4.4 --enable-shared --enable-multiarch
> --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib
> --without-included-gettext --enable-threads=posix
> --with-gxx-include-dir=/usr/include/c++/4.4 --libdir=/usr/lib --enable-nls
> --enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc
> --enable-targets=all --with-arch-32=i586 --with-tune=generic
> --enable-checking=release --build=i486-linux-gnu --host=i486-linux-gnu
> --target=i486-linux-gnu
> Thread model: posix
>
> which option make the two commands different?
>
I think that question is more suitable for gcc or ld mailing lists.


>
> Thanks!
>
> >
> > Ian
>
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-- 
Thank you
Warm Regards
Anuz
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