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Re: [libvirt] [PATCH v6 1/6] add a configure option --with-fuse to prepare introduction of fuse support for libvirt lxc



于 2012年11月05日 20:14, Richard W.M. Jones 写道:
> On Mon, Nov 05, 2012 at 08:10:26PM +0800, Gao feng wrote:
>> 于 2012年11月05日 18:30, Daniel P. Berrange 写道:
>>> On Mon, Nov 05, 2012 at 10:11:17AM +0000, Richard W.M. Jones wrote:
>>>> On Mon, Nov 05, 2012 at 01:23:51PM +0800, Gao feng wrote:
>>>>> +dnl libfuse
>>>>> +AC_ARG_WITH([fuse],
>>>>> +  AC_HELP_STRING([--with-fuse], [use libfuse to proivde fuse filesystem support for libvirt lxc]),
>>>>> +  [],
>>>>> +  [with_fuse=check])
>>>>> +dnl
>>>>> +dnl This check looks for 'fuse'
>>>>> +dnl
>>>>> +FUSE_CFLAGS=
>>>>> +FUSE_LIBS=
>>>>> +if test "x$with_fuse" != "xno"; then
>>>>> +  PKG_CHECK_MODULES([FUSE], [fuse >= $FUSE_REQUIRED],
>>>>> +    [with_fuse=yes], [
>>>>> +    if test "x$with_fuse" = "xcheck" ; then
>>>>> +        with_fuse=no
>>>>> +    else
>>>>> +        AC_MSG_ERROR(
>>>>> +          [You must install fuse Library to compile libvirt])
>>>>> +    fi
>>>>> +  ])
>>>>> +  if test "x$with_fuse" = "xyes" ; then
>>>>> +    FUSE_LIBS="-lfuse"
>>>>> +    FUSE_CFLAGS="-D_FILE_OFFSET_BITS=64"
>>>
>>> As per Rich's comments, these 2 lines are bogus. The PKG_CHECK_MODULES
>>> macro should already be setting FUSE_LIBS and FUSE_CFLAGS to the
>>> correct values defined in the pkg-config file for FUSE.
>>>
>>>>> +    AC_DEFINE_UNQUOTED([HAVE_FUSE], 1, [whether fuse is available for libvirt lxc])
>>>>> +  fi
>>>>> +fi
>>>>> +AM_CONDITIONAL([HAVE_FUSE], [test "x$with_fuse" = "xyes"])
>>>>> +AC_SUBST([FUSE_CFLAGS])
>>>>> +AC_SUBST([FUSE_LIBS])
>>>>> +
>>>>
>>>> For comparison, here is how we test for fuse in libguestfs:
>>>>
>>>> dnl FUSE is optional to build the FUSE module.
>>>> AC_ARG_ENABLE([fuse],
>>>>         AS_HELP_STRING([--disable-fuse], [disable FUSE (guestmount) support]),
>>>>         [],
>>>>         [enable_fuse=yes])
>>>> AS_IF([test "x$enable_fuse" != "xno"],
>>>>         [PKG_CHECK_MODULES([FUSE],[fuse],
>>>>             [AC_SUBST([FUSE_CFLAGS])
>>>>              AC_SUBST([FUSE_LIBS])
>>>>              AC_DEFINE([HAVE_FUSE],[1],[Define to 1 if you have FUSE.])
>>>>              old_LIBS="$LIBS"
>>>>              LIBS="$FUSE_LIBS $LIBS"
>>>>              AC_CHECK_FUNCS([fuse_opt_add_opt_escaped])
>>>>              LIBS="$old_LIBS"
>>>>             ],
>>>>             [enable_fuse=no
>>>>              AC_MSG_WARN([FUSE library and headers are missing, so optional FUSE module won't be built])
>>>>             ])
>>>>         ])
>>>> AM_CONDITIONAL([HAVE_FUSE],[test "x$enable_fuse" != "xno"])
>>>>
>>>> [ https://github.com/libguestfs/libguestfs/blob/master/configure.ac#L744 ]
>>>>
>>>> Is there any reason not to use PKG_CHECK_MODULES?
>>>
>>
>> Is this ok? I'm not familiar with this :(
>>
>> dnl libfuse
>> AC_ARG_WITH([fuse],
>>   AC_HELP_STRING([--with-fuse], [use libfuse to proivde fuse filesystem support for libvirt lxc]),
>>   [],
>>   [with_fuse=check])
>> dnl
>> dnl This check looks for 'fuse'
>> dnl
>> AS_IF([test "x$with_fuse" != "xno"],
>>         [PKG_CHECK_MODULES([FUSE], [fuse >= $FUSE_REQUIRED],
>>           [with_fuse=yes
>>            AC_SUBST([FUSE_CFLAGS])
>>            AC_SUBST([FUSE_LIBS])
>>            AC_DEFINE([HAVE_FUSE], [1], [whether fuse is available for libvirt lxc])
>>           ],
>>           [with_fuse=no
>>            AC_MSG_ERROR([You must install fuse Library to compile libvirt])
>>           ])
>>         ])
>> AM_CONDITIONAL([HAVE_FUSE], [test "x$with_fuse" = "xyes"])
> 
> It looks OK, but you need to try all four combinations: with and
> without fuse-devel installed, and --with-fuse and --without-fuse.
> 
> As written, --with-fuse=check and --with-fuse=yes both do the same
> thing (check for FUSE), which is probably OK but may not be what you
> meant to write.
> 

Get it,will test and fix this small problem.
Thanks again :)



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