On 24-06-2011 12:38, Andrew Haley wrote:
On 06/24/2011 11:19 AM, Agner Fog wrote:
On 24-06-2011 10:23, Andrew Haley wrote:
Why does it make 32 bit absolute addresses when I specify
-mcmodel=medium?
Small symbols are placed in the lower 2G.
So I would have to replace all variables with very big arrays in order
to prevent 32 bit addresses in 64 bit mode :-(
What problem are you trying to solve? I don't get it. Why would you
want to avoid 32-bit absolute addresses?
Because the linker complains whenever there is a 32 bit absolute
reference in a 64 bit shared object. I guess the .so can be loaded above
the 2G address limit.
Apparently, the only way to avoid 32 bit addresses is compiling with
-fpic, which has the undesired effect of using GOT and PLT entries which
makes shared objects slower than static libraries. The seldom used
feature to override a symbol comes at a high price.
