what is the difference between the two command?
horserivers at gmail.com
Sun Jan 20 20:01:03 EST 2013
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.
Using built-in specs.
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?
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