what is the difference between the two command?

[Ian Lance Taylor]

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.

Ian