Re: [Qemu-devel] [PATCH] Add --disable-bridge-helper configure flag

From: "Andreas Färber" <afaerber@suse.de>
To: Fabien Chouteau <chouteau@adacore.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>,
	Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>,
	Stefan Weil <sw@weilnetz.de>,
	coreyb@linux.vnet.ibm.com, qemu-devel@nongnu.org,
	Luiz Capitulino <lcapitulino@redhat.com>,
	Blue Swirl <blauwirbel@gmail.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Michael Roth <mdroth@linux.vnet.ibm.com>
Subject: Re: [Qemu-devel] [PATCH] Add --disable-bridge-helper configure flag
Date: Tue, 10 Jul 2012 19:29:17 +0200	[thread overview]
Message-ID: <4FFC666D.2080703@suse.de> (raw)
In-Reply-To: <1341917019-23224-1-git-send-email-chouteau@adacore.com>

Am 10.07.2012 12:43, schrieb Fabien Chouteau:
> Bridge helper uses ioctl's not available on old Linux versions, we add
> this flag to disable the build.
> 
> Signed-off-by: Fabien Chouteau <chouteau@adacore.com>
> ---
>  Makefile  |    2 +-
>  configure |    8 ++++++++
>  2 files changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/Makefile b/Makefile
> index 34d6a9e..b46c6b0 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -37,7 +37,7 @@ $(call set-vpath, $(SRC_PATH))
>  
>  LIBS+=-lz $(LIBS_TOOLS)
>  
> -HELPERS-$(CONFIG_LINUX) = qemu-bridge-helper$(EXESUF)
> +HELPERS-$(CONFIG_HELPERS) = qemu-bridge-helper$(EXESUF)
>  
>  ifdef BUILD_DOCS
>  DOCS=qemu-doc.html qemu-tech.html qemu.1 qemu-img.1 qemu-nbd.8 QMP/qmp-commands.txt

Three quick comments:

We should also disable build of all helpers when compiling with --static.

I don't like the bridge helper being disabled based on CONFIG_HELPERS,
suggest specific CONFIG_BRIDGE_HELPER or so.

All --disable-* options should probably have an --enable-* counterpart.

Andreas

> diff --git a/configure b/configure
> index 500fe24..5566752 100755
> --- a/configure
> +++ b/configure
> @@ -195,6 +195,7 @@ zlib="yes"
>  guest_agent="yes"
>  libiscsi=""
>  coroutine=""
> +bridge_helper="yes"
>  
>  # parse CC options first
>  for opt do
> @@ -824,6 +825,8 @@ for opt do
>    ;;
>    --disable-guest-agent) guest_agent="no"
>    ;;
> +  --disable-bridge-helper) bridge_helper="no"
> +  ;;
>    *) echo "ERROR: unknown option $opt"; show_help="yes"
>    ;;
>    esac
> @@ -1110,6 +1113,7 @@ echo "  --disable-guest-agent    disable building of the QEMU Guest Agent"
>  echo "  --enable-guest-agent     enable building of the QEMU Guest Agent"
>  echo "  --with-coroutine=BACKEND coroutine backend. Supported options:"
>  echo "                           gthread, ucontext, sigaltstack, windows"
> +echo "  --disable-bridge-helper  disable building of the qemu-bridge-helper"
>  echo ""
>  echo "NOTE: The object files are built at the place where configure is launched"
>  exit 1
> @@ -3896,6 +3900,10 @@ if test "$tcg_interpreter" = "yes" ; then
>    echo "CONFIG_TCI_DIS=y"  >> $libdis_config_mak
>  fi
>  
> +if test "$bridge_helper" = "yes" && test "$linux" = "yes" ; then
> +    echo "CONFIG_HELPERS=y" >> $config_host_mak
> +fi
> +
>  case "$ARCH" in
>  alpha)
>    # Ensure there's only a single GP
> 

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