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Re: PATCH: Support DF_1_GLOBAL
On Wed, Nov 21, 2012 at 1:00 PM, Carlos O'Donell
<carlos@systemhalted.org> wrote:
> On Wed, Nov 21, 2012 at 3:54 PM, H.J. Lu <hongjiu.lu@intel.com> wrote:
>> Hi,
>>
>> This patch adds DF_1_GLOBAL support. Tested on x86-64, using linkers
>> with and without -z global support. OK to install?
>>
>> Thanks.
>>
>>
>> H.J.
>> ---
>> 2012-11-21 H.J. Lu <hongjiu.lu@intel.com>
>>
>> * config.make.in (have-z-global): New variable.
>> * configure.in: Check if linker supports -z global.
>> * configure: Regenerated.
>> * elf/Makefile (tests): Add reldep10 if linker supports -z global.
>> (modules-names): Add reldepmod7.
>> (LDFLAGS-reldepmod7.so): New macro.
>> ($(objpfx)reldep10): New target.
>> ($(objpfx)reldep10.out): Likewise.
>> * elf/dl-open.c (dl_open_worker): Support DF_1_GLOBAL.
>> * elf/reldep10.c: New file.
>> * elf/reldepmod7.c: Likewise.
>> * include/elf.h (DT_1_SUPPORTED_MASK): Add DF_1_GLOBAL.
>
> The Solaris documention I've seen from Oracle says the value
> of DF_1_GLOBAL is unused.
>
> What documentation defines the purpose of DF_1_GLOBAL?
>
> If DF_1_GLOBAL is documented somewhere, and we are following established
> and compatible practice through the use of RTLD_GLOBAL, then I'm happy
> to support the flag.
>
It is documented in elf/elf.h:
#define DF_1_GLOBAL 0x00000002 /* Set RTLD_GLOBAL for this object. */
I don't have access to other OSes.
--
H.J.