[Bug target/41644] -minimal-toc not helping for toc section exceeding 64k

["jakub at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #9 from jakub at gcc dot gnu dot org  2009-10-12 10:12 -------
The documentation is correct.  With -mminimal-toc you get just one entry in the
.toc per TU.  That TU's .toc entry then points into the middle of .toc1 section
chunk with TOC stuff for that TU.  And your problem is not .toc section
overflow, but that the displacements within .toc1 section for that TU are too
large (can be only signed 16 bit immediate, so for 8 byte addresses 8192
pointers).  If you have many string literals, even when you split into multiple
TUs, you'll need -mminimal-toc (otherwise .toc would overflow).  If you have
too many in one translation unit, there is at least currently no GCC option
that will allow it to be compiled on ppc64.  With the ppc64 ISA gcc in theory
could do something similar to what SPARC does with -fPIC (unlike -fpic), where
each toc load/store would instead of ld reg,something@toc(2) be lis
tempreg,something@toc@hi; addis tempreg,tempreg,2; ld
reg,something@toc@l(tempreg).  But that would be something completely different
from -mminimal-toc.


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jakub at gcc dot gnu dot org changed:

           What    |Removed                     |Added
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                 CC|                            |amodra at gcc dot gnu dot
                   |                            |org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41644