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From: Bruce Richardson <bruce.richardson@intel.com>
To: Panu Matilainen <pmatilai@redhat.com>
Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH] Make -Werror optional
Date: Thu, 12 Feb 2015 14:02:24 +0000	[thread overview]
Message-ID: <20150212140223.GA5012@bricha3-MOBL3> (raw)
In-Reply-To: <54DCB16F.7080104@redhat.com>

On Thu, Feb 12, 2015 at 03:58:07PM +0200, Panu Matilainen wrote:
> On 02/12/2015 02:08 PM, Bruce Richardson wrote:
> >On Thu, Feb 12, 2015 at 02:02:19PM +0200, Panu Matilainen wrote:
> >>On 02/12/2015 01:25 PM, Bruce Richardson wrote:
> >>>On Thu, Feb 12, 2015 at 01:13:22PM +0200, Panu Matilainen wrote:
> >>>>This adds new CONFIG_RTE_ERROR_ON_WARNING config option to enable
> >>>>fail-on-warning compile behavior, defaulting to off.
> >>>>
> >>>>Failing build on warnings is a useful developer tool but its bad
> >>>>for release tarballs which can and do get built with newer
> >>>>compilers than what was used/available during development. Compilers
> >>>>routinely add new warnings so code which built silently with cc X
> >>>>might no longer do so with X+1. This doesn't make the existing code
> >>>>any more buggier and failing the build in this case does not help
> >>>>not help improve code quality of an already released version either.
> >>>
> >>>This can already be achieve by passing EXTRA_CFLAGS='-Wno-error' into the
> >>>build command. I don't like changing the default option here. Better to
> >>>instead document how to disable the warning flags if necessary.
> >>
> >>Well, optimally it would only default to off in released versions, which is
> >>where the Werror behavior is just annoying without being useful.
> >
> >This I can agree with.
> 
> Ok, would something to this tune be more acceptable?
> 
> diff --git a/mk/rte.vars.mk b/mk/rte.vars.mk
> index d5b36be..2ad969b 100644
> --- a/mk/rte.vars.mk
> +++ b/mk/rte.vars.mk
> @@ -71,6 +71,10 @@ ifneq ($(BUILDING_RTE_SDK),)
>    ifeq ($(RTE_BUILD_COMBINE_LIBS),)
>      RTE_BUILD_COMBINE_LIBS := n
>    endif
> +  # see if we're building from git
> +  ifneq ($(wildcard $(RTE_SDK)/.git),)
> +    DEVEL_BUILD := y
> +  endif
>  endif
> 
>  RTE_LIBNAME := $(CONFIG_RTE_LIBNAME:"%"=%)
> diff --git a/mk/toolchain/gcc/rte.vars.mk b/mk/toolchain/gcc/rte.vars.mk
> index 88f235c..a14ae44 100644
> --- a/mk/toolchain/gcc/rte.vars.mk
> +++ b/mk/toolchain/gcc/rte.vars.mk
> @@ -71,12 +71,16 @@ ifeq (,$(findstring -O0,$(EXTRA_CFLAGS)))
>  endif
>  endif
> 
> -WERROR_FLAGS := -W -Wall -Werror -Wstrict-prototypes -Wmissing-prototypes
> +WERROR_FLAGS := -W -Wall -Wstrict-prototypes -Wmissing-prototypes
>  WERROR_FLAGS += -Wmissing-declarations -Wold-style-definition
> -Wpointer-arith
>  WERROR_FLAGS += -Wcast-align -Wnested-externs -Wcast-qual
>  WERROR_FLAGS += -Wformat-nonliteral -Wformat-security
>  WERROR_FLAGS += -Wundef -Wwrite-strings
> 
> +ifeq ($(DEVEL_BUILD),y)
> +WERROR_FLAGS += -Werror
> +endif
> +
>  # process cpu flags
>  include $(RTE_SDK)/mk/toolchain/$(RTE_TOOLCHAIN)/rte.toolchain-compat.mk
> 
> (non-gcc toolchains are missing and whitespace probably broken due to
> copy-paste, this is not a suggested patch but just an RFC for the approach)
> 
> 
> 	- Panu -
> 
Looks ok to me.
/Bruce

  reply	other threads:[~2015-02-12 14:02 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-02-12 11:13 Panu Matilainen
2015-02-12 11:25 ` Bruce Richardson
2015-02-12 12:02   ` Panu Matilainen
2015-02-12 12:08     ` Bruce Richardson
2015-02-12 13:58       ` Panu Matilainen
2015-02-12 14:02         ` Bruce Richardson [this message]
2015-02-12 14:05         ` Thomas Monjalon
2015-02-12 15:18         ` [dpdk-dev] [PATCH v2] mk: Only default to -Werror when building from git checkout Panu Matilainen
2015-02-20 12:15           ` Thomas Monjalon
2015-02-21  2:15             ` Stephen Hemminger
2015-02-21 10:48               ` Thomas Monjalon
2016-03-02 14:22             ` [dpdk-dev] [PATCH v3] mk: stop on warning only in developer build Thomas Monjalon
2016-03-02 22:04               ` Bruce Richardson
2016-03-03 10:36                 ` Thomas Monjalon
2016-03-03 10:53                   ` Panu Matilainen
2015-02-12 14:38 ` [dpdk-dev] [PATCH] Make -Werror optional Stephen Hemminger
2015-02-12 14:54   ` Panu Matilainen
2015-02-21  1:55     ` Stephen Hemminger
2015-02-21 19:33       ` Neil Horman
2015-02-23  8:19         ` Panu Matilainen
2015-02-23 13:55           ` Neil Horman
2015-02-23 14:20             ` Panu Matilainen

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