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Re: [PATCH] - objcopy --extract-symbol clears e_flags ELF header field

On Thu, 15 Oct 2015, Alan Modra wrote:

> On Wed, Oct 14, 2015 at 09:44:39PM +0200, Ronald Hoogenboom wrote:
> > Or move the 2 lines to after the bfd_copy_private_bfd_data. So BFD needs to
> > be adapted for all kinds of targets I never even heard about. There the test
> > in the testsuite will be indispensable. Can you give me some pointers on how
> > to get that done?
> My advice about moving the tests to binutils/testsuite/ probably
> wasn't so good.  On looking at objcopy.exp in detail, I see many of
> the tests require a C compiler.  That means you need a whole lot more
> infrastructure in order to test cross-binutils well.  So perhaps the
> test is best left in ld/testsuite, but moved out of ld-elf.
> Like this.  The new testcase shows that objcopy --extract-symbol
> isn't working on PE, mips, mmix and some aout targets.

Regarding mmix, you get an inconsistency error:
x/ld/../binutils/objcopy: tmpdir/extract:
Bad symbol definition: `Main' set to 0000000000000000 rather than the start address 0000000000000000

That's because objcopy --extract-symbol hacks in a start-address
0 instead of letting it be or consulting the target (new
framework may be needed).  Why does it change the start-address?
The symbols are left, so why zero the start-adress; why is that
more logical than keeping it when removing all contents?
If the answer is ELF-related, I think it'd be up to ELF bits to
handle the start-address-zeroing.

brgds, H-P

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