[LEDE-DEV] dropbear & gcc 7.1.0

[Syrone Wong]

Forgot to mention, it needs additional CFLAGS to include
tommath_class.h correctly, this hasn't been included into my repo.


TARGET_CFLAGS +=  -Ilibtommath/


Best Regards,
Syrone Wong


On Thu, Jun 1, 2017 at 2:10 PM, Syrone Wong <wong.syrone at gmail.com> wrote:
> Confirmed that with the latest libtom*, dropbear works well on MIPS & GCC 7.
>
> This repo is based on dropbear 2017.75.
>
> https://github.com/wongsyrone/dropbear-test
> Best Regards,
> Syrone Wong
>
>
> On Thu, Jun 1, 2017 at 5:48 AM, Syrone Wong <wong.syrone at gmail.com> wrote:
>> I checked the bundled libtom* in dropbear:
>>
>> bundled: libtomcrypt is 1.16, libtommath is 0.40
>> latest: libtomcrypt is 1.17, libtommath is 1.0
>>
>> There are various fixes since the bundled version:
>> https://github.com/libtom/libtommath/releases
>>
>> I will try the latest version from libtom.
>>
>>
>> Best Regards,
>> Syrone Wong
>>
>>
>> On Thu, Jun 1, 2017 at 3:17 AM, e9hack <e9hack at gmail.com> wrote:
>>> Am 30.05.2017 um 08:25 schrieb Syrone Wong:
>>>> Can this related to endianness? Based on current reports, it only
>>>> occurs on big-endian platforms.
>>>>
>>>> I found:
>>>>
>>>> * Note: in order to use the optimized macros your platform must
>>>> support unaligned 32 and 64 bit read/writes.
>>>> * The x86 platforms allow this but some others [ARM for instance] do
>>>> not. On those platforms you **MUST**
>>>> * use the portable [slower] macros.
>>>>
>>>> in https://github.com/mkj/dropbear/blob/master/libtomcrypt/src/headers/tomcrypt_cfg.h
>>>>
>>>> A quick way to verify this might be define LTC_NO_ASM.
>>>
>>> Defining LTC_NO_ASM doesn't help. It seems, the problem is somewhere in libtommath. Patching of Makefile.in in
>>> libtommath solves the problem for me:
>>>
>>> #################
>>> --- a/libtommath/Makefile.in    2017-05-18 16:47:02.000000000 +0200
>>> +++ b/libtommath/Makefile.in    2017-05-31 18:21:24.318437603 +0200
>>> @@ -11,6 +11,8 @@
>>>  # So that libtommath can include Dropbear headers for options and m_burn()
>>>  CFLAGS += -I. -I$(srcdir) -I../libtomcrypt/src/headers/ -I$(srcdir)/../libtomcrypt/src/headers/ -I../ -I$(srcdir)/../
>>>
>>> +CFLAGS += -O2
>>> +
>>>  ifndef IGNORE_SPEED
>>>
>>>  #for speed
>>> #################
>>>
>>> Regards,
>>> Hartmut
>>>
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