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From: Thomas Monjalon <thomas.monjalon@6wind.com>
To: Ferruh Yigit <ferruh.yigit@intel.com>
Cc: dev@dpdk.org, Panu Matilainen <pmatilai@redhat.com>,
	Christian Ehrhardt <christian.ehrhardt@canonical.com>
Subject: Re: [dpdk-dev] [PATCH 1/2] mk: prevent overlinking in applications
Date: Thu, 09 Jun 2016 12:10:18 +0200	[thread overview]
Message-ID: <7354386.zBuGXxEf9j@xps13> (raw)
In-Reply-To: <1464367686-3475-1-git-send-email-ferruh.yigit@intel.com>

Hi Ferruh,

2016-05-27 17:48, Ferruh Yigit:
> Replace --no-as-needed linker flag with --as-needed flag, which will
> only link libraries directly called by application. This requires inter
> library dependencies resolved correctly.
> 
> Not linking all libraries cause a compile error for lpcap and possible
> to have other similar compiler errors, so increasing the scope of
> --start-group argument.

What is the error?

> cmdline_test application causes compile error because of cyclic
> dependency between librte_eal <-> librte_mempool. A workaround added to
> cmdline_test for compile error.
> 
> Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>

> --- a/app/cmdline_test/Makefile
> +++ b/app/cmdline_test/Makefile
> @@ -46,6 +46,7 @@ SRCS-y += commands.c
>  
>  CFLAGS += -O3
>  CFLAGS += $(WERROR_FLAGS)

A comment is required here to explain the workaround.

> +LDFLAGS += -no-as-needed

The option should be --no-as-needed.

> --- a/mk/exec-env/linuxapp/rte.vars.mk
> +++ b/mk/exec-env/linuxapp/rte.vars.mk
> @@ -46,7 +46,7 @@ EXECENV_CFLAGS  = -pthread
>  endif
>  
>  # Workaround lack of DT_NEEDED entry

This comment is obsolete now.

> -EXECENV_LDFLAGS = --no-as-needed
> +EXECENV_LDFLAGS = --as-needed

Why put this option for Linux only?
Shouldn't we restrict this option to app.mk only?

> --- a/mk/rte.app.mk
> +++ b/mk/rte.app.mk
> @@ -58,6 +58,7 @@ _LDLIBS-y += -L$(RTE_SDK_BIN)/lib
>  #
>  
>  _LDLIBS-y += --whole-archive
> +_LDLIBS-y += --start-group

--start-group must be used only to solve circular dependencies.
Ideally we should not use it. I think it's needed only because
of EAL logs using mempool (must be removed).
Why extending it?
I'm afraid we are masking some issues.

>  _LDLIBS-$(CONFIG_RTE_LIBRTE_DISTRIBUTOR)    += -lrte_distributor
>  _LDLIBS-$(CONFIG_RTE_LIBRTE_REORDER)        += -lrte_reorder
> @@ -111,8 +112,6 @@ _LDLIBS-y                                   += -lcrypto
>  endif
>  endif # !CONFIG_RTE_BUILD_SHARED_LIBS
>  
> -_LDLIBS-y += --start-group
> -
>  _LDLIBS-$(CONFIG_RTE_LIBRTE_KVARGS)         += -lrte_kvargs
>  _LDLIBS-$(CONFIG_RTE_LIBRTE_MBUF)           += -lrte_mbuf
>  _LDLIBS-$(CONFIG_RTE_LIBRTE_IP_FRAG)        += -lrte_ip_frag

  parent reply	other threads:[~2016-06-09 10:10 UTC|newest]

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-05-19 15:38 [dpdk-dev] Underlinked libs and overlinked applications - an issue? Christian Ehrhardt
2016-05-19 18:17 ` Thomas Monjalon
2016-05-20 11:01   ` Panu Matilainen
2016-05-20 12:41     ` Christian Ehrhardt
2016-05-20 16:43       ` Christian Ehrhardt
2016-05-20 16:50         ` [dpdk-dev] [PATCH] mk: fix underlinking issues of most librte libraries Christian Ehrhardt
2016-05-20 17:08           ` Thomas Monjalon
2016-05-24  9:56             ` Panu Matilainen
2016-05-24 10:11               ` Christian Ehrhardt
2016-05-26 13:13                 ` Ferruh Yigit
2016-05-27  5:59                   ` Panu Matilainen
2016-05-27 16:15                     ` Ferruh Yigit
2016-05-27 16:48                       ` [dpdk-dev] [PATCH 1/2] mk: prevent overlinking in applications Ferruh Yigit
2016-05-27 16:48                         ` [dpdk-dev] [PATCH 2/2] mk: reduce scope of whole-archive to pmd libraries Ferruh Yigit
2016-06-10  9:03                           ` Thomas Monjalon
2016-06-10  9:57                             ` Ferruh Yigit
2016-06-10 10:18                               ` Thomas Monjalon
2016-06-10 11:06                                 ` Ferruh Yigit
2016-06-10 12:21                                   ` Thomas Monjalon
2016-06-10 13:35                                     ` Ferruh Yigit
2016-06-09 10:10                         ` Thomas Monjalon [this message]
2016-06-09 13:05                           ` [dpdk-dev] [PATCH 1/2] mk: prevent overlinking in applications Ferruh Yigit
2016-06-10 13:19                         ` [dpdk-dev] [PATCH v2 0/6] reduce " Thomas Monjalon
2016-06-10 13:19                           ` [dpdk-dev] [PATCH v2 1/6] mk: sort drivers in static application link list Thomas Monjalon
2016-06-10 13:19                           ` [dpdk-dev] [PATCH v2 2/6] mk: fix driver dependencies order for static application Thomas Monjalon
2016-06-10 14:49                             ` Ferruh Yigit
2016-06-10 14:54                               ` Thomas Monjalon
2016-06-10 13:19                           ` [dpdk-dev] [PATCH v2 3/6] mk: remove library grouping during application linking Thomas Monjalon
2016-06-10 14:54                             ` Ferruh Yigit
2016-06-10 15:14                               ` Thomas Monjalon
2016-06-10 13:19                           ` [dpdk-dev] [PATCH v2 4/6] mk: prevent overlinking in applications Thomas Monjalon
2016-06-10 14:56                             ` Ferruh Yigit
2016-06-10 15:15                               ` Thomas Monjalon
2016-06-10 13:19                           ` [dpdk-dev] [PATCH v2 5/6] mk: sort libraries in level order when linking Thomas Monjalon
2016-06-10 13:19                           ` [dpdk-dev] [PATCH v2 6/6] mk: reduce scope of whole-archive static linking Thomas Monjalon
2016-06-10 15:03                             ` Ferruh Yigit
2016-06-10 15:18                               ` Thomas Monjalon
2016-06-10 18:32                           ` [dpdk-dev] [PATCH v3 0/6] reduce overlinking in applications Ferruh Yigit
2016-06-10 18:32                             ` [dpdk-dev] [PATCH v3 1/6] mk: sort drivers in static application link list Ferruh Yigit
2016-06-10 19:38                               ` Wiles, Keith
2016-06-10 18:32                             ` [dpdk-dev] [PATCH v3 2/6] mk: fix driver dependencies order for static application Ferruh Yigit
2016-06-10 18:32                             ` [dpdk-dev] [PATCH v3 3/6] mk: sort libraries when linking, move pmd libs to higher level Ferruh Yigit
2016-06-13  9:29                               ` Thomas Monjalon
2016-06-13 10:04                                 ` Ferruh Yigit
2016-06-13 10:21                                   ` Thomas Monjalon
2016-06-13 10:29                                     ` Ferruh Yigit
2016-06-10 18:32                             ` [dpdk-dev] [PATCH v3 4/6] mk: sort libraries when linking, move external libs to lower level Ferruh Yigit
2016-06-10 18:32                             ` [dpdk-dev] [PATCH v3 5/6] mk: remove library grouping during application linking Ferruh Yigit
2016-06-10 18:32                             ` [dpdk-dev] [PATCH v3 6/6] mk: prevent overlinking in applications Ferruh Yigit
2016-06-11  6:34                               ` Thomas Monjalon
2016-06-13  9:05                                 ` Ferruh Yigit
2016-06-13  9:24                                   ` Christian Ehrhardt
2016-06-13  9:48                                     ` [dpdk-dev] [PATCH] mk: fix missing DEPDIRS to avoid libarary underlinking Christian Ehrhardt
2016-06-13 10:08                                       ` Thomas Monjalon
2016-06-13 10:20                                         ` Christian Ehrhardt
2016-06-13 11:06                                           ` [dpdk-dev] [PATCH v2 0/2] mk: fix more library underlinking Christian Ehrhardt
2016-06-13 11:06                                             ` [dpdk-dev] [PATCH v2 1/2] mk: fix missing vhost dependency to pthread to avoid libarary underlinking Christian Ehrhardt
2016-06-13 11:06                                             ` [dpdk-dev] [PATCH v2 2/2] mk: fix missing DEPDIRS " Christian Ehrhardt
2016-06-13 14:16                                             ` [dpdk-dev] [PATCH v2 0/2] mk: fix more library underlinking Thomas Monjalon
2016-06-13 14:14                           ` [dpdk-dev] [PATCH v2 0/6] reduce overlinking in applications Thomas Monjalon
2016-06-07  8:23               ` [dpdk-dev] [PATCH] mk: fix underlinking issues of most librte libraries Thomas Monjalon
2016-06-07  9:25                 ` Panu Matilainen

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