[Bug binutils/22136] Support marking "debug" info files with special ET_GNU_DEBUG_* values.

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=22136

--- Comment #16 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Mark Wielaard from comment #15)
> (In reply to H.J. Lu from comment #14)
> > Anything else besides "identical to the phdrs"?  Must .dynamic section have
> > the identical section contents in debug info file?
> 
> Allocated sections are NOBITS in a separate debug file.

I checked libfoo.so against the output of "objcopy --only-keep-debug".
Their program headers are different:

--- 2   2017-09-15 13:22:32.131099976 -0700
+++ 1   2017-09-15 13:22:28.642092002 -0700
@@ -5,11 +5,11 @@ There are 7 program headers, starting at

 Program Headers:
   Type           Offset   VirtAddr           PhysAddr           FileSiz 
MemSiz   Flg Align
-  LOAD           0x000000 0x0000000000000000 0x0000000000000000 0x0006a8
0x0006a8 R E 0x200000
-  LOAD           0x000df8 0x0000000000200df8 0x0000000000200df8 0x000228
0x000230 RW  0x200000
-  DYNAMIC        0x000e10 0x0000000000200e10 0x0000000000200e10 0x0001d0
0x0001d0 RW  0x8
+  LOAD           0x000000 0x0000000000000000 0x0000000000000000 0x0001ec
0x0006a8 R E 0x200000
+  LOAD           0x000df8 0x0000000000200df8 0x0000000000200df8 0x000000
0x000230 RW  0x200000
+  DYNAMIC        0x000df8 0x0000000000200e10 0x0000000000200e10 0x000000
0x0001d0 RW  0x8
   NOTE           0x0001c8 0x00000000000001c8 0x00000000000001c8 0x000024
0x000024 R   0x4
-  GNU_EH_FRAME   0x000614 0x0000000000000614 0x0000000000000614 0x000024
0x000024 R   0x4
+  GNU_EH_FRAME   0x0001ec 0x0000000000000614 0x0000000000000614 0x000000
0x000024 R   0x4
   GNU_STACK      0x000000 0x0000000000000000 0x0000000000000000 0x000000
0x000000 RW  0x10
   GNU_RELRO      0x000df8 0x0000000000200df8 0x0000000000200df8 0x000208
0x000208 R   0x1

Where does "identical" come from?  How is "identical" checked?

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