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@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? 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,ob jc,obj-c++ --prefix=/usr --program-suffix=-4.4 --enable-shared --enable-multiarch --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib --without-includ ed-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 gcc version 4.4.5 (Debian 4.4.5-8)
Ian