On 8/17/23 12:03, Ilya Maximets wrote:
> On 8/17/23 09:31, Dumitru Ceara wrote:
>> On 8/17/23 00:26, Ilya Maximets wrote:
>>> This fixes the obsolescence warning for AC_TRY_RUN with autoconf 2.70+:
>>>
>>>   $ ./boot.sh
>>>   configure.ac:141: warning: The macro `AC_TRY_RUN' is obsolete.
>>>   configure.ac:141: You should run autoupdate.
>>>   ./lib/autoconf/general.m4:2997: AC_TRY_RUN is expanded from...
>>>   lib/m4sugar/m4sh.m4:692: _AS_IF_ELSE is expanded from...
>>>   lib/m4sugar/m4sh.m4:699: AS_IF is expanded from...
>>>   ./lib/autoconf/general.m4:2249: AC_CACHE_VAL is expanded from...
>>>   ./lib/autoconf/general.m4:2270: AC_CACHE_CHECK is expanded from...
>>>   m4/ax_func_posix_memalign.m4:27: AX_FUNC_POSIX_MEMALIGN is expanded 
>>> from...
>>>   configure.ac:141: the top level
>>>
>>> Signed-off-by: Ilya Maximets <i.maxim...@ovn.org>
>>> ---
>>>  m4/ax_func_posix_memalign.m4 | 8 ++++----
>>>  1 file changed, 4 insertions(+), 4 deletions(-)
>>>
>>> diff --git a/m4/ax_func_posix_memalign.m4 b/m4/ax_func_posix_memalign.m4
>>> index bd60adcbc..2442ceca7 100644
>>> --- a/m4/ax_func_posix_memalign.m4
>>> +++ b/m4/ax_func_posix_memalign.m4
>>> @@ -1,5 +1,5 @@
>>>  # 
>>> ===========================================================================
>>> -#  http://www.gnu.org/software/autoconf-archive/ax_func_posix_memalign.html
>>> +#  
>>> https://www.gnu.org/software/autoconf-archive/ax_func_posix_memalign.html
>>>  # 
>>> ===========================================================================
>>>  #
>>>  # SYNOPSIS
>>> @@ -22,12 +22,12 @@
>>>  #   and this notice are preserved. This file is offered as-is, without any
>>>  #   warranty.
>>>  
>>> -#serial 7
>>> +#serial 9
>>>  
>>>  AC_DEFUN([AX_FUNC_POSIX_MEMALIGN],
>>>  [AC_CACHE_CHECK([for working posix_memalign],
>>>    [ax_cv_func_posix_memalign_works],
>>> -  [AC_TRY_RUN([
>>> +  [AC_RUN_IFELSE([AC_LANG_SOURCE([[
>>>  #include <stdlib.h>
>>>  
>>>  int
>>> @@ -39,7 +39,7 @@ main ()
>>>     * the size word. */
>>>    exit (posix_memalign (&buffer, sizeof(void *), 123) != 0);
>>>  }
>>> -    ],
>>> +    ]])],
>>>      [ax_cv_func_posix_memalign_works=yes],
>>>      [ax_cv_func_posix_memalign_works=no],
>>>      [ax_cv_func_posix_memalign_works=no])])
>>
>> Hi Ilya,
>>
>> This looks correct but I we don't use HAVE_POSIX_MEMALIGN anywhere.
>> OVS libs do but OVN doesn't do that directly.
>>
>> Shouldn't we just remove this all together instead?  What do you think?
> 
> You're probably right and we could remove the macro, but I didn't
> test that.  Was just fixing a problem at hands.
> 

It was easy to remove but..

> The issue however might arise in the future if the check will
> ever creep out from OVS'es .c files to its internal (non-public)
> headers that OVN use.  In this case, if OVN will not check, it
> will silently start using a slow allocation method.
> 

.. indeed OVN uses internal OVS stuff so it's probably safer to keep the
check.  I pushed it as is.

Thanks!

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