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Re: [patch] allow suppression of fde encoding warning
On 01/19/2013 11:02 PM, Ian Lance Taylor wrote:
On Sat, Jan 19, 2013 at 12:14 PM, Sandra Loosemore
Google turned up a few references to this problem on other targets that
indicated that the "right" solution is for GCC to emit section-relative
references in the FDE data. But, not all architectures support such a thing
in the ABI (and, in particular, the Nios II ABI doesn't have an appropriate
relocation for this purpose). So, it seems like we should be able to turn
the warning off on architectures where the optimization cannot possibly
I think the correct solution is to avoid using the --eh-frame-hdr
option on architectures where it can not work. I think the linker is
correctly warning you that although you explicitly specified
--eh-frame-hdr, you aren't going to get an exception frame header.
Actually, I did not explicitly specify --eh-frame-hdr. GCC adds it to
the link spec by default if the linker supports it, and ld thinks that
all ELF targets support this option. So, where's the right place to
suppress that -- GCC or ld? Is --eh-frame-hdr never useful for anything
on this architecture, or is it only the combination with -fpie that is bad?