From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thomas Monjalon <thomas.monjalon@6wind.com>
Subject: Re: how to compile kernel drivers only
Date: Thu, 30 Jul 2015 15:41:05 +0200
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To: "Montorsi, Francesco" <fmontorsi@empirix.com>
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Francesco, please reply below (easier to follow the thread).

2015-07-30 12:48, Montorsi, Francesco:
> From: Thomas Monjalon [mailto:thomas.monjalon@6wind.com] 
> > 2015-07-30 12:17, Montorsi, Francesco:
> > > How can I avoid building any app like dump_cfg?
> > 
> > In app/Makefile, you'll find the options to disable:
> > 	DIRS-$(CONFIG_RTE_APP_TEST) += test
> > 	DIRS-$(CONFIG_RTE_LIBRTE_ACL) += test-acl
> > 	DIRS-$(CONFIG_RTE_LIBRTE_PIPELINE) += test-pipeline
> > 	DIRS-$(CONFIG_RTE_TEST_PMD) += test-pmd
> > 	DIRS-$(CONFIG_RTE_LIBRTE_CMDLINE) += cmdline_test
> > 	DIRS-$(CONFIG_RTE_LIBRTE_EAL_LINUXAPP) += proc_info
> 
> My problem is that I have in app/Makefile:
> 
> DIRS-$(CONFIG_RTE_LIBRTE_EAL_LINUXAPP) += dump_cfg
> 
> So that I should put 
> 
> CONFIG_RTE_LIBRTE_EAL_LINUXAPP=n
> 
> To disable dump_cfg application build. However, If I do so, the kernel drivers are not built at all and make just says:
> 
> make T=x86_64-native-linuxapp-gcc O=x86_64-native-linuxapp-gcc EXTRA_LDFLAGS="" --directory=dpdk-2.0.0 all
> make[1]: Entering directory `/home/hammer/share/CSA-Hamachi-Sprint/HW-Accel/drivers/dpdk/dpdk-2.0.0'
> == Build lib
> == Build lib/librte_compat
>   SYMLINK-FILE include/rte_compat.h
> == Build lib/librte_eal
> == Build app
> Build complete
> 
> So that 
> CONFIG_RTE_LIBRTE_EAL_LINUXAPP=y
> Seems to be a pre-requisite of kernel drivers... or am I missing something?

You're right. You cannot build only kernel drivers.
You are welcome to add a new config option to enable/disable apps.