[dpdk-dev] [PATCH] pci: fix missing pci bus with shared library build

[Thomas Monjalon]

22/07/2019 18:43, Stephen Hemminger:
> On Mon, 22 Jul 2019 10:06:11 +0100
> Bruce Richardson <bruce.richardson at intel.com> wrote:
> > On Mon, Jul 22, 2019 at 09:38:27AM +0200, Thomas Monjalon wrote:
> > > 19/07/2019 22:55, Stephen Hemminger:  
> > > > The root cause is that recent gcc won't run constructor on unused libraries.
> > > > Testing a patch to take --as-needed off of PCI library.
> > > > 
> > > > See: https://stackoverflow.com/questions/11631161/force-to-link-against-unused-shared-library  
> > > 
> > > The constructor is run when calling dlopen, right?
> > > 
> > > Note: dlopen with -d is a feature.
> > > The original idea was to be able to specify which driver we want to use.
> > > If we want an automatic dlopen, like modprobe, then we need more scripts.
> > > But I understand you are against the whole dlopen idea.
> > 
> > This issue is more of a problem for development systems where we EAL path
> > is not really usable for finding the drivers. For a properly deployed
> > system where we use DPDK installed to /usr/local or /usr, the EAL PMD path
> > will be correctly configured and properly probe all drivers.
> 
> The problem is that bus drivers register themselves in constructors and
> these construtors are not run with as-needed.

Are the constructors run on dlopen of the bus driver?