On Tue, Apr 3, 2012 at 12:45 PM, Richard Earnshaw <rearn...@arm.com> wrote:
> On 03/04/12 10:29, Andrew Haley wrote:
>> On 04/02/2012 10:06 PM, dann frazier wrote:
>>> On Fri, Mar 30, 2012 at 06:52:34PM +0100, Richard Earnshaw wrote:
>>>> On 29/03/12 20:34, dann frazier wrote:
>>>>> This is an updated version of a patch Debian and Ubuntu are using to
>>>>> use an alternate linker path for hardfloat binaries. The difference
>>>>> with this one is that it covers the case where no float flag
>>>>> was passed in, defaulting to the softfloat path.
>>>>>
>>>>> 2012-03-29 dann frazier <dann.fraz...@canonical.com>
>>>>>
>>>>> * config/arm/linux-elf.h: Use alternate linker path
>>>>> for hardfloat ABI
>>>>>
>>>>> Index: gcc/config/arm/linux-elf.h
>>>>> ===================================================================
>>>>> --- gcc/config/arm/linux-elf.h (revision 185708)
>>>>> +++ gcc/config/arm/linux-elf.h (working copy)
>>>>> @@ -59,14 +59,21 @@
>>>>>
>>>>> #define LIBGCC_SPEC "%{mfloat-abi=soft*:-lfloat} -lgcc"
>>>>>
>>>>> -#define GLIBC_DYNAMIC_LINKER "/lib/ld-linux.so.2"
>>>>> +#define LINUX_DYNAMIC_LINKER_SF "/lib/ld-linux.so.3"
>>>>> +#define LINUX_DYNAMIC_LINKER_HF "/lib/arm-linux-gnueabihf/ld-linux.so.3"
>>>>>
>>>>> #define LINUX_TARGET_LINK_SPEC "%{h*} \
>>>>> %{static:-Bstatic} \
>>>>> %{shared:-shared} \
>>>>> %{symbolic:-Bsymbolic} \
>>>>> %{rdynamic:-export-dynamic} \
>>>>> - -dynamic-linker " GNU_USER_DYNAMIC_LINKER " \
>>>>> + %{msoft-float:-dynamic-linker " LINUX_DYNAMIC_LINKER_SF "} \
>>>>> + %{mfloat-abi=soft*:-dynamic-linker " LINUX_DYNAMIC_LINKER_SF "} \
>>>>> + %{mhard-float:-dynamic-linker " LINUX_DYNAMIC_LINKER_HF "} \
>>>>> + %{mfloat-abi=hard:-dynamic-linker " LINUX_DYNAMIC_LINKER_HF "} \
>>>>> + %{!mfloat-abi: \
>>>>> + %{!msoft-float: \
>>>>> + %{!mhard-float:-dynamic-linker " LINUX_DYNAMIC_LINKER_SF "}}} \
>>>>> -X \
>>>>> %{mbig-endian:-EB} %{mlittle-endian:-EL}" \
>>>>> SUBTARGET_EXTRA_LINK_SPEC
>>>>>
>>>>
>>>> Looks to me as though this will break the old Linux ABI. While we've
>>>> marked that as deprecated, it hasn't been removed as yet. So I think
>>>> this patch either needs to wait until that removal has taken place, or
>>>> provide the relevant updates to maintain the old ABI support.
>>>
>>> Thanks for your review. You're right, this does appear to break the
>>> old ABI - that was a misunderstanding on my part. I think this fixes
>>> the problem:
>>
>> But what about those of us who are using hard-float but not the
>> Debian liker path? It'll break, surely. This looks to be like
>> it's Debian-specific.
>>
>
> Are you trying to tell me that some distros are using /lib/ld-linux.so.3
> directly for hard-float? Sigh, you distro guys need to start talking to
> each other, rather than just going of inventing things ...
>
> If, so then there's only one way to sort out this mess.
>
> /lib/arm-linux-gnueabi/ld-linux.so.3 Location of soft-float loader
> /lib/arm-linux-gnueabihf/ld-linux.so.3 Location of hard-float loader
> /lib/ld-linux.so.3 legacy symlink to one of the above.
>
> Or something of this nature.
>
> All this is outside of GCC's remit though and I'm not in a position to
> drive any of it through.
>
> :-( :-( :-(
Now, I wonder why the dynamic linker cannot figure out the ABI itself
by means of using ELF flags or so?
Richard.
> R.
>
>
