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From: "Kinsella, Ray" <mdr@ashroe.eu>
To: Thomas Monjalon <thomas@monjalon.net>, Fady Bader <fady@mellanox.com>
Cc: dev@dpdk.org, Tasnim Bashar <tbashar@mellanox.com>,
	Tal Shnaiderman <talshn@mellanox.com>,
	Yohad Tor <yohadt@mellanox.com>,
	"dmitry.kozliuk@gmail.com" <dmitry.kozliuk@gmail.com>,
	"harini.ramakrishnan@microsoft.com"
	<harini.ramakrishnan@microsoft.com>,
	"ocardona@microsoft.com" <ocardona@microsoft.com>,
	"pallavi.kadam@intel.com" <pallavi.kadam@intel.com>,
	"ranjit.menon@intel.com" <ranjit.menon@intel.com>,
	"olivier.matz@6wind.com" <olivier.matz@6wind.com>,
	"arybchenko@solarflare.com" <arybchenko@solarflare.com>,
	"nhorman@tuxdriver.com" <nhorman@tuxdriver.com>
Subject: Re: [dpdk-dev] [PATCH v3 1/4] eal: disable function versioning on Windows
Date: Tue, 7 Jul 2020 08:57:00 +0100
Message-ID: <76729a53-a8e1-17c5-f58b-6eab796ca58a@ashroe.eu> (raw)
In-Reply-To: <1842931.9hOUdKzN8j@thomas>



On 05/07/2020 21:00, Thomas Monjalon wrote:
> 05/07/2020 11:00, Thomas Monjalon:
>> 05/07/2020 10:51, Fady Bader:
>>> From: Thomas Monjalon <thomas@monjalon.net>
>>>> 05/07/2020 09:00, Fady Bader:
>>>>>> On 30/06/2020 11:49, Kinsella, Ray wrote:
>>>>>>> On 22/06/2020 12:55, Fady Bader wrote:
>>>>>>>> --- a/lib/librte_eal/include/rte_function_versioning.h
>>>>>>>> +++ b/lib/librte_eal/include/rte_function_versioning.h
>>>>>>>> @@ -11,6 +11,10 @@
>>>>>>>>  #error Use of function versioning disabled, is
>>>> "use_function_versioning=true"
>>>>>> in meson.build?
>>>>>>> Do we need a meson error/rule that catches if people explicitly
>>>>>>> try to enable
>>>>>> function_versioning.
>>>>>>> We don't want to just silently fail under such circumstances?
>>>>>>>
>>>>>>> Would something in lib/meson.build would work better?
>>>>>>>
>>>>>>> if use_function_versioning and target_machine.system == "Windows"
>>>>>>> 	// complain loudly ...
>>>>>>> endif
>>>>>>>
>>>>>
>>>>> I think this would be a better approach.
>>>>> But instead of checking if the use of function versioning is enabled
>>>>> under Windows and then complain, I think we should simply disable it
>>>>> from Windows in the meson.build file. Something like this:
>>>>>
>>>>> if target_machine.system == "Windows"
>>>>> 	use_function_versioning = false
>>>>> endif
>>>>
>>>> Did you try?
>>>>
>>>> If you disable function versioning, compilation will fail with the #error message
>>>> above, right?
>>>>
>>>
>>> Yes, the compilation fails, we can also change the rte_function_versioning.h
>>> code in order not to fail under Windows.
>>> What do you think ?
>>
>> Function versioning CANNOT be supported currently on Windows.
>> Function versioning macros are MANDATORY in some libraries.
>> That's why I think the only path is to have a specific
>> implementation of the function versioning macros for Windows.
> 
> After a closer look with Fady, the empty macros already exist
> for the static case.
> If disabling function versioning in shared case, the DLL is built
> with the object files compiled for the static library.
> Conclusion: disabling function versioning on Windows works
> (after disabling the error message).
> 

perfect, good work.
 

  reply	other threads:[~2020-07-07  7:57 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <'20200531124151.16848-2-fady@mellanox.com'>
2020-06-22 11:55 ` [dpdk-dev] [PATCH v3 0/4] build mempool " Fady Bader
2020-06-22 11:55   ` [dpdk-dev] [PATCH v3 1/4] eal: disable function versioning " Fady Bader
2020-06-29 23:26     ` Thomas Monjalon
2020-07-02 10:25       ` Fady Bader
2020-06-30 10:49     ` Kinsella, Ray
2020-07-02 14:56       ` Kinsella, Ray
2020-07-05  7:00         ` Fady Bader
2020-07-05  8:37           ` Thomas Monjalon
2020-07-05  8:51             ` Fady Bader
2020-07-05  9:00               ` Thomas Monjalon
2020-07-05 20:00                 ` Thomas Monjalon
2020-07-07  7:57                   ` Kinsella, Ray [this message]
2020-06-22 11:55   ` [dpdk-dev] [PATCH v3 2/4] mempool: use generic memory management Fady Bader
2020-06-22 11:55   ` [dpdk-dev] [PATCH v3 3/4] eal: export needed functions for mempool Fady Bader
2020-06-29 23:28     ` Thomas Monjalon
2020-07-02 10:24       ` Fady Bader
2020-06-22 11:55   ` [dpdk-dev] [PATCH v3 4/4] mempool: mempool build on Windows Fady Bader

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