[v3] use -Wl,-z,relro if possible

[Benjamin Kosnik]

> On x86-linux, stock binutils 2.16.1, today I'm seeing a bunch of new
> failures in 21_string:

[snip]

> which I suspect could be related to the recent ld changes: sorry, I
> don't know at the moment which one. For instance, for char/6.cc:
> 
> /usr/bin/ld:
> testsuite_abi.o(.text._ZNSs12_S_constructIPcEES0_T_S1_RKSaIcESt20forward_iterator_tag[char*
> std::basic_string<char, std::char_traits<char>, std::allocator<char>
> >::_S_construct<char*>(char*, char*, std::allocator<char> const&,
> std::forward_iterator_tag)]+0x8b): unresolvable relocation against
> symbol `std::__throw_logic_error(char const*)@@GLIBCXX_3.4'
> /usr/bin/ld: final link failed: Nonrepresentable section on output
> collect2: ld returned 1 exit status
> compiler exited with status 1
> 
> Can you have a look?

Sure.

I tested with:

GNU ld version 2.15.92.0 20040927
GNU ld version 2.15.94.0.2.2 20041220
GNU ld version 060113 20060113
GNU ld version 2.16.1

Cannot reproduce... I don't see any new fails on gcc-testresults.

Can you double check? If there's something wrong, I'd like to do
something more sane then the following to disable...

best,
benjamin 
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