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Re: [PATCH 1/5] Use -fPIC instead of -fpic when generating PIC code.
- From: Jose E. Marchesi <jose dot marchesi at oracle dot com>
- To: elfutils-devel at lists dot fedorahosted dot org
- Date: Mon, 05 Oct 2015 23:57:50 +0200
- Subject: Re: [PATCH 1/5] Use -fPIC instead of -fpic when generating PIC code.
> This avoids relocation overflows in sparc/sparc64 targets while
> linking, where the reachable data using -fpic is only 4kb.
I think this is OK. -fpic/-fPIC only changes things on m68k, PowerPC
and SPARC. So the only other arch we currently support that this
might impact is powerpc. Is there any disadvantage on that platform
of using -fPIC instead of -fpic?
I am not sure of the details in powerpc, but in RISC architectures with
fixed-width 32-bit instructions using -fPIC usually translates into
larger text sections, as it requires using more instructions to handle
the GOT table offsets when compared with -fpic.
For example, in SPARC -fPIC uses three instructions for each GOT
reference, while -fpic uses just one instruction.