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From: Stefan Puiu <stefan.puiu@gmail.com>
To: Neil Horman <nhorman@tuxdriver.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH v2 1/4] mk: Remove combined library and related options
Date: Fri, 13 Mar 2015 16:12:35 +0200	[thread overview]
Message-ID: <CACKs7VAOZ-e6=jC_kUJC0eO5wfj5r3uaPOR3QGyHpzxC_vLttA@mail.gmail.com> (raw)
In-Reply-To: <20150313131719.GA28191@hmsreliant.think-freely.org>

Hi,

2 cents from a DPDK library user - I make 2 changes to the default
linux+gcc configuration: combine libraries and build shared libraries
(since I want 2 instances of the app, it didn't make sense to me to
link statically). I tried working with the individual libs, but adding
all of them with --start-group/-end-group just seemed so much more
painful than simply linking against one lib. I know there are some
Makefile variables to help with this, but I use scons for building my
app, so that doesn't help much.

Of course, if that can be achieved easily after building all the
libraries, that's fine. But I think combining the libs makes a lot of
sense in many cases.

Thanks,
Stefan.

On Fri, Mar 13, 2015 at 3:17 PM, Neil Horman <nhorman@tuxdriver.com> wrote:
> On Fri, Mar 13, 2015 at 11:48:59AM +0000, Gonzalez Monroy, Sergio wrote:
>> On 13/03/2015 11:34, Kavanagh, Mark B wrote:
>> >>On 13/03/2015 10:49, Kavanagh, Mark B wrote:
>> >>>>---
>> >>>>config/common_bsdapp                        |   6 --
>> >>>>config/common_linuxapp                      |   6 --
>> >>>>config/defconfig_ppc_64-power8-linuxapp-gcc |   2 -
>> >>>>lib/Makefile                                |   1 -
>> >>>>mk/rte.app.mk                               |  12 ----
>> >>>>mk/rte.lib.mk                               |  35 ----------
>> >>>>mk/rte.sdkbuild.mk                          |   3 -
>> >>>>mk/rte.sharelib.mk                          | 101 ----------------------------
>> >>>>mk/rte.vars.mk                              |   9 ---
>> >>>>9 files changed, 175 deletions(-)
>> >>>>delete mode 100644 mk/rte.sharelib.mk
>> >>>>
>> >>>>diff --git a/config/common_bsdapp b/config/common_bsdapp
>> >>>>index 8ff4dc2..7ee5ecf 100644
>> >>>>--- a/config/common_bsdapp
>> >>>>+++ b/config/common_bsdapp
>> >>>>@@ -79,12 +79,6 @@ CONFIG_RTE_FORCE_INTRINSICS=n
>> >>>>CONFIG_RTE_BUILD_SHARED_LIB=n
>> >>>>
>> >>>>#
>> >>>>-# Combine to one single library
>> >>>>-#
>> >>>>-CONFIG_RTE_BUILD_COMBINE_LIBS=n
>> >>>>-CONFIG_RTE_LIBNAME=intel_dpdk
>> >>>Hi Sergio,
>> >>>
>> >>>Removing these options breaks compatibility with OVS. While it may be feasible to link
>> >>to individual static libraries, in our experience, a single combined library provides a
>> >>much more convenient way of linking.
>> >>>Thanks,
>> >>>Mark
>> >>>
>> >>>>-
>> >
>> >(snip)
>> >
>> >
>> >>>>-endif
>> >>>>-
>> >>>>-RTE_LIBNAME := $(CONFIG_RTE_LIBNAME:"%"=%)
>> >>>>-ifeq ($(RTE_LIBNAME),)
>> >>>>-RTE_LIBNAME := intel_dpdk
>> >>>>endif
>> >>>>
>> >>>># RTE_TARGET is deducted from config when we are building the SDK.
>> >>>>--
>> >>>>1.9.3
>> >>Hi Mark,
>> >>
>> >>How does this patch break compatibility with OVS?
>> >>
>> >>Thanks,
>> >>Sergio
>> >Hey Sergio,
>> >
>> >We use the CONFIG_RTE_BUILD_COMBINE_LIBS and CONFIG_RTE_LINBNAME flags to build a single static DPDK library, named 'libintel_dpdk.a', which OVS links against. Removing the combined library option breaks compatibility with any application that links against the combined DPDK library.
>> >
>> >Is there a strong technical motivation for removing these options?
>> >
>> >Thanks,
>> >Mark
>> From a shared library point of view, it just does not make sense to have
>> applications linked against a 'combined' library that may have different
>> features built in it.
>>
>> Removing these options, aside from the obvious 'less build config option',
>> it simplifies maintenance of makefiles as we currently have a separated
>> makefile with specific rules just for combined library.
>>
>> It is pretty straight forward to build a single combined archive out of
>> multiple archives, would it be acceptable to have a script to do this?
>>
>> Thanks,
>> Sergio
>>
> +1
>
> For the static case, its easy to do a post build combination of archives.  For
> the shared library case, its equally easy to simply create a linker scripts call
> <CONFIG_RTE_LIBNAME>.so that pulls in all the individual libraries.
>
> Neil
>

  reply	other threads:[~2015-03-13 14:12 UTC|newest]

Thread overview: 63+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-29 15:20 [dpdk-dev] [PATCH 0/8] Improve build process Sergio Gonzalez Monroy
2015-01-29 15:20 ` [dpdk-dev] [PATCH 1/8] mk: remove combined library and related options Sergio Gonzalez Monroy
2015-01-29 15:20 ` [dpdk-dev] [PATCH 2/8] core: create new librte_core Sergio Gonzalez Monroy
2015-01-29 15:20 ` [dpdk-dev] [PATCH 3/8] mk: new corelib makefile Sergio Gonzalez Monroy
2015-01-29 15:20 ` [dpdk-dev] [PATCH 4/8] lib: update DEPDIRS variable Sergio Gonzalez Monroy
2015-01-29 15:20 ` [dpdk-dev] [PATCH 5/8] lib: set LDLIBS for each library Sergio Gonzalez Monroy
2015-01-29 15:20 ` [dpdk-dev] [PATCH 6/8] mk: use LDLIBS when linking shared libraries Sergio Gonzalez Monroy
2015-01-29 15:20 ` [dpdk-dev] [PATCH 7/8] mk: update LDLIBS for app building Sergio Gonzalez Monroy
2015-01-29 15:20 ` [dpdk-dev] [PATCH 8/8] mk: add -lpthread to linuxapp EXECENV_LDLIBS Sergio Gonzalez Monroy
2015-01-29 16:38 ` [dpdk-dev] [PATCH 0/8] Improve build process Neil Horman
2015-01-29 17:02   ` Thomas Monjalon
2015-01-29 17:04   ` Gonzalez Monroy, Sergio
2015-01-29 19:45     ` Neil Horman
2015-01-30 13:39       ` Gonzalez Monroy, Sergio
2015-01-30 14:05         ` Neil Horman
2015-01-30 17:38           ` Gonzalez Monroy, Sergio
2015-01-30 18:12             ` Neil Horman
2015-02-11 11:11               ` Gonzalez Monroy, Sergio
2015-02-12  5:41                 ` Neil Horman
2015-02-12  9:17                   ` Gonzalez Monroy, Sergio
2015-02-12 12:16                     ` Neil Horman
2015-02-12  9:22                 ` Panu Matilainen
2015-02-12 10:03                   ` Gonzalez Monroy, Sergio
2015-02-12 12:23                     ` Neil Horman
2015-02-12 14:07                       ` Panu Matilainen
2015-02-12 15:52                         ` Neil Horman
2015-02-13 10:14                           ` Panu Matilainen
2015-02-13 11:08                             ` Gonzalez Monroy, Sergio
2015-02-13 12:51                               ` Neil Horman
2015-02-20 14:31                                 ` Gonzalez Monroy, Sergio
2015-02-22 23:37                                   ` Neil Horman
2015-02-23 10:25                                     ` Gonzalez Monroy, Sergio
2015-02-23 13:52                                       ` Neil Horman
2015-02-23 14:58                                         ` Gonzalez Monroy, Sergio
2015-02-23 18:23                                           ` Neil Horman
2015-02-24 13:24                                             ` Gonzalez Monroy, Sergio
2015-03-12 16:27 ` [dpdk-dev] [PATCH v2 0/4] " Sergio Gonzalez Monroy
2015-03-12 16:27   ` [dpdk-dev] [PATCH v2 1/4] mk: Remove combined library and related options Sergio Gonzalez Monroy
2015-03-13 10:49     ` Kavanagh, Mark B
2015-03-13 11:19       ` Gonzalez Monroy, Sergio
2015-03-13 11:34         ` Kavanagh, Mark B
2015-03-13 11:48           ` Gonzalez Monroy, Sergio
2015-03-13 13:16             ` Kavanagh, Mark B
2015-03-13 14:11               ` Gonzalez Monroy, Sergio
2015-03-13 13:17             ` Neil Horman
2015-03-13 14:12               ` Stefan Puiu [this message]
2015-03-13 15:18                 ` Neil Horman
2015-03-13 15:28                   ` Gonzalez Monroy, Sergio
2015-03-13 16:16                     ` Neil Horman
2015-03-13 16:07     ` Stephen Hemminger
2015-03-13 16:32       ` Neil Horman
2015-03-13 16:38       ` Gonzalez Monroy, Sergio
2015-03-18 12:11     ` Gonzalez Monroy, Sergio
2015-03-18 12:59       ` Thomas Monjalon
2015-03-18 15:30         ` Stefan Puiu
2015-03-18 15:52           ` Gonzalez Monroy, Sergio
2015-03-18 16:48           ` Neil Horman
2015-03-26  8:52         ` Gonzalez Monroy, Sergio
2015-03-26 10:30           ` Neil Horman
2015-03-18 16:41       ` Neil Horman
2015-03-12 16:27   ` [dpdk-dev] [PATCH v2 2/4] lib: Set LDLIBS for each library Sergio Gonzalez Monroy
2015-03-12 16:28   ` [dpdk-dev] [PATCH v2 3/4] mk: Use LDLIBS when linking shared libraries Sergio Gonzalez Monroy
2015-03-12 16:28   ` [dpdk-dev] [PATCH v2 4/4] mk: update LDLIBS for app building Sergio Gonzalez Monroy

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