[dpdk-dev] [PATCH v2] ABI: Add abi checking utility

[Thomas Monjalon]

2015-03-04 09:39, Neil Horman:
> On Wed, Mar 04, 2015 at 01:54:49PM +0100, Thomas Monjalon wrote:
> > Hi Neil,
> > 
> > I remove parts that I agree and reply to those which deserve more discussion.
> > 
> > 2015-03-04 06:49, Neil Horman:
> > > On Tue, Mar 03, 2015 at 11:18:47PM +0100, Thomas Monjalon wrote:
> > > > 2015-02-02 13:18, Neil Horman:
> > > > > +# Validate that we have all the arguments we need
> > > > > +if [ ! -d ./.git ]
> > > > > +then
> > > > > +	log "WARN" "You must be in the root of the dpdk git tree"
> > > > > +	log "WARN" "You are in $PWD"
> > > > > +	cleanup_and_exit 1
> > > > > +fi
> > > > 
> > > > Why not cd $(dirname $0)/.. instead of returning an error?
> > > 
> > > Why would that help in finding the base of the git tree.  Theres no guarantee
> > > that you are in a subdirectory of a git tree.  I suppose we can try it
> > > recursively until we hit /, but it seems just as easy and clear to tell the user
> > > whats needed.
> > 
> > No I'm saying that you could avoid this check by going into the right
> > directory from the beginning.
> > We know that the root dir is $(dirname $0)/.. because this script is in
> > scripts/ directory.
> > 
> That only helps if you start from the right directory.  If you run this command
> from some other location, your solution just breaks.

Why it would break? $(dirname $0) is always reachable because you launched $0.
The only exception is for the case the PATH variable is used to find the DPDK
scripts/ directory (should not happen).

> > > > > +# Make sure we configure SHARED libraries
> > > > > +# Also turn off IGB and KNI as those require kernel headers to build
> > > > > +sed -i -e"$ a\CONFIG_RTE_BUILD_SHARED_LIB=y" config/defconfig_$TARGET
> > > > > +sed -i -e"$ a\CONFIG_RTE_EAL_IGB_UIO=n" config/defconfig_$TARGET
> > > > > +sed -i -e"$ a\CONFIG_RTE_LIBRTE_KNI=n" config/defconfig_$TARGET
> > > > 
> > > > Why not tuning configuration after make config in .config file?
> > > > 
> > > Because this way we save a reconfig (from a developer viewpoint), you should run
> > > make config again after changing configs, and so this way you save doing that.
> > 
> > No, you run make config once and update .config file. That's the recommended
> > way to configure DPDK.
> > defconfig files are default configurations and should stay read-only.
> 
> They get overwritten when we do the git resets.  Its silly to modify your config
> file after you run make config, in the event the make target has to re-read any
> modified options and adjust dependent config files accordingly.  I understand
> that doesn't happen now, but its common practice for every open source project
> in existance.

I'm not sure to understand. Maybe an example would help.
By the way, your method works.