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Re: [RFC] PowerPC select_section / unique_section
On Thu, Aug 29, 2002 at 06:01:18PM -0700, Richard Henderson wrote:
> On Thu, Aug 22, 2002 at 11:29:31AM +0930, Alan Modra wrote:
> > Ouch. Forget my suggestion re decl_readonly_section. Hmm, would
> > you accept a patch that cleans up flag_pic in rs6000.c? ie. has
> > flag_pic always set for ABI_AIX?
>
> That will pessimize ppc64-elf name binding. (I.e. binds_local_p.)
Uh, oh. If I understand binds_local_p and mark_constant_function
correctly, setting flag_pic is actually a bug-fix when compiling
powerpc64-linux shared libs. We have the standard ELF binding of
global syms. That is, global functions may be overridden by functions
in another shared library or by the main application.
So powerpc64-linux-gcc should allow -fpic/PIC to twiddle flag_pic for
binds_local_p, and users should set -fPIC when compiling shared libs
as is common on other ELF targets. We could use another flag, because
like that annoying rs6000.c warning says "all code is position
independent" on ppc64, but that would make powerpc64-linux just that
more odd. Lots of packages set -fPIC to mean "compile me code for a
shared library".
--
Alan Modra
IBM OzLabs - Linux Technology Centre