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From: Thomas Monjalon <thomas.monjalon@6wind.com>
To: Sergio Gonzalez Monroy <sergio.gonzalez.monroy@intel.com>
Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH] mk: fix acl library static linking
Date: Thu, 30 Jun 2016 17:28:27 +0200	[thread overview]
Message-ID: <1797205.YMNToqyLHv@xps13> (raw)
In-Reply-To: <2994f200-70c4-3fe2-5976-fc1799271430@intel.com>

2016-06-30 15:02, Sergio Gonzalez Monroy:
> On 30/06/2016 13:44, Thomas Monjalon wrote:
> > 2016-06-30 13:04, Sergio Gonzalez Monroy:
> >> On 30/06/2016 12:38, Thomas Monjalon wrote:
> >>> Does it need to be commented in rte.app.mk?
> >>> The other libs are in whole-archive to support dlopen of drivers.
> >>> But the problem here is not because of a driver use.
> >> There seem to be a bunch of libraries under --whole-archive scope that
> >> are not
> >> PMDs, ie. cfgfile, cmdline...
> >>
> >> What is the criteria?
> > The criteria is a bit vague. We must try to include only libs which can
> > be used by a driver.
> > cmdline should probably not be there.
> > Does it make sense to use cfgfile in a driver? maybe yes.
> 
> So as it is, ACL autotest is broken when building static libs 
> (non-combined).

I think the --whole-archive option must be set specifically for ACL
with a comment explaining it is required because of weak functions:

# librte_acl needs --whole-archive because of weak functions
_LDLIBS-$(CONFIG_RTE_LIBRTE_ACL) += --whole-archive -lrte_acl --no-whole-archive

> For combined libs we usually wrap libdpdk.a with --whole-archive, thus it is
> not an issue.
> 
> Just thinking a bit more about the 'dlopen of drivers' case you 
> mentioned before,
> shouldn't the driver have proper dependencies and therefore need shared 
> DPDK libraries?

It is possible to build a .so, without any DT_NEEDED entries, which will
find the required symbols in the static linked binary.

> What does happen if binary/app and driver are built against different 
> library versions?

Bad things :)

> Where does it say that we do support this use case?

It is maybe not written. But I know it is used by people wanting to load
some PMD.so on demand while having the rest statically compiled.
I agree it needs to be documented and probably better managed and tested.

  parent reply	other threads:[~2016-06-30 15:36 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-30 11:10 Sergio Gonzalez Monroy
2016-06-30 11:38 ` Thomas Monjalon
2016-06-30 12:04   ` Sergio Gonzalez Monroy
2016-06-30 12:44     ` Thomas Monjalon
2016-06-30 14:02       ` Sergio Gonzalez Monroy
2016-06-30 15:24         ` Ananyev, Konstantin
2016-06-30 15:47           ` Thomas Monjalon
2016-06-30 15:28         ` Thomas Monjalon [this message]
2016-06-30 15:58           ` Sergio Gonzalez Monroy
2016-06-30 12:14 ` Ananyev, Konstantin
2016-06-30 16:01 ` [dpdk-dev] [PATCH v2] " Sergio Gonzalez Monroy
2016-06-30 16:10   ` Thomas Monjalon
2016-06-30 16:14     ` Sergio Gonzalez Monroy
2016-06-30 16:22       ` Thomas Monjalon
2016-07-01  8:05         ` Sergio Gonzalez Monroy
2016-07-01 10:05           ` Thomas Monjalon
2016-07-01 10:27             ` Sergio Gonzalez Monroy
2016-07-01 10:39               ` Thomas Monjalon
2016-06-30 16:11   ` [dpdk-dev] [PATCH v3] " Sergio Gonzalez Monroy
2016-07-01 14:38     ` [dpdk-dev] [PATCH v4 1/2] mk: allow duplicate linker flags in libraries list Sergio Gonzalez Monroy
2016-07-01 14:38       ` [dpdk-dev] [PATCH v4 2/2] mk: fix acl library static linking Sergio Gonzalez Monroy
2016-07-01 14:45         ` Thomas Monjalon

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