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Re: [PATCH roland/ehdr_start] Use __ehdr_start, when available, for rtld to get its own headers.
- From: "Carlos O'Donell" <carlos at redhat dot com>
- To: Roland McGrath <roland at hack dot frob dot com>, Siddhesh Poyarekar <siddhesh dot poyarekar at gmail dot com>
- Cc: "GNU C. Library" <libc-alpha at sourceware dot org>
- Date: Mon, 17 Mar 2014 18:29:30 -0400
- Subject: Re: [PATCH roland/ehdr_start] Use __ehdr_start, when available, for rtld to get its own headers.
- Authentication-results: sourceware.org; auth=none
- References: <20140311222933 dot CC24274474 at topped-with-meat dot com> <CAAHN_R13tXB1XyUOTEpLAABpvP7FCnbqa-7-c5kx7XHY8--rGA at mail dot gmail dot com> <20140317200749 dot A65E874461 at topped-with-meat dot com>
On 03/17/2014 04:07 PM, Roland McGrath wrote:
>> This causes a failure in check-abi-ld.
>
> I have no problems on x86_64-linux-gnu with trunk binutils.
>
>> It looks like the additional symbol entry:
>>
>> 0000000000000000 g D .note.gnu.build-id 0000000000000000 Base
>> .hidden __ehdr_start
>>
>> needs to either be accounted for in the abilist files or ignored in
>> the abilist script.
>
> That looks like a binutils bug. __ehdr_start should never make it to
> .dynsym. Give details about your libc configuration and your binutils
> version.
I see this on f19 build systems.
--- ../sysdeps/unix/sysv/linux/x86_64/64/nptl/ld.abilist 2014-03-14 13:44:46.788247781 -0400
+++ /home/carlos/build/glibc-wundef/elf/ld.symlist 2014-03-17 01:17:11.841818363 -0400
@@ -0,0 +1,2 @@
+Base
+__ehdr_start Base g ? D .hash 0000000000000000
...
Symbol table '.dynsym' contains 29 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND
1: 0000000000000ab0 0 SECTION LOCAL DEFAULT 10
2: 0000000000000000 0 NOTYPE GLOBAL HIDDEN 1 __ehdr_start
...
GNU assembler version 2.23.52.0.1 (x86_64-redhat-linux) \
using BFD version version 2.23.52.0.1-9.fc19 20130226
../../src/glibc/configure --prefix=/usr \
--with-headers=/home/carlos/install-linux/include \
--without-selinux --enable-add-ons=nptl
Cheers,
Carlos.