On 31 May 2010, at 14:23, Matthias Klumpp wrote:
A quick check which eu-findtextrels found a lot of those in the lib.
Exactly the same code compiled for 64bit does not contain any text
relocation.
How can this happen?
It's because we don't generate PIC (position-independent code) by
default on Linux-i386, because
a) PIC is fairly inefficient on i386 (it requires an extra register,
and the i386 is already register-starved as it is -- on average, it
results in a 10% performance degradation)
b) very few people use SELinux, and on non-SELinux systems dynamic
libraries without PIC work fine (with a small memory usage penalty,
because the code cannot be shared amongst multiple processes)
On x86-64, there is almost no penalty for PIC vs no PIC.
You have to recompile the entire RTL and your own code with the -Cg
compiler option to get shared libraries that only contain PIC.
Jonas
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