Re: [Xen-devel] [PATCH 4 of 4 RFC] xl/remus: Add libnl3 dependency to autoconf scripts and libxl/Makefile

[Wen Congyang <wency@xxxxxxxxxxxxxx>]

At 07/26/2013 09:56 PM, Shriram Rajagopalan Wrote:
> On Fri, Jul 26, 2013 at 5:56 AM, David Vrabel <david.vrabel@xxxxxxxxxx> wrote:
>> On 25/07/13 08:09, Shriram Rajagopalan wrote:
>>> Add dependency on libnl3 version 3.2.17 or higher to autoconf.
>>> Add include flags and link to relevant libraries in tools/libxl/Makefile.
>>>
>>> Signed-off-by: Shriram Rajagopalan <rshriram@xxxxxxxxx>
>>>
>>> diff -r bef729fc4336 -r c4c05e4e4e02 tools/configure.ac
>>> --- a/tools/configure.ac      Thu Jul 25 00:02:22 2013 -0700
>>> +++ b/tools/configure.ac      Thu Jul 25 00:02:33 2013 -0700
>>> @@ -171,4 +171,12 @@ AC_SUBST(libiconv)
>>>  # Checks for header files.
>>>  AC_CHECK_HEADERS([yajl/yajl_version.h sys/eventfd.h])
>>>
>>> +# Checks for libnl3 libraries and headers.
>>> +PKG_CHECK_MODULES(LIBNL3, libnl-3.0 >= 3.2.17 libnl-route-3.0 >= 3.2.17, 
>>> [have_libnl3=yes], [have_libnl3=no])
>>> +if (test "${have_libnl3}" = "yes"); then
>>> +        CFLAGS+="-I$LIBNL3_CFLAGS"
>>> +else
>>> +     AC_MSG_ERROR([Need libnl version 3.2.17 or higher])
>>> +fi
>>
>> Using pkg-config here...
>>
> 
> The pkg-config idea was based on the suggestion here
> http://www.carisma.slowglass.com/~tgr/libnl/doc/core.html#_linking_to_this_library
> 
> If I use AC_CHECK_LIB and AC_CHECK_HEADERS, would it automatically add the
> include path to CFLAGS, such that I wouldnt have to manually specify
> -I flags in libxl/Makefile ?

No. AC_CHECK_HEADERS can check if the header file is under the default 
directory.
If the header file is under the directory /usr/include, you can use it.
But why your header file is under the directory /usr/local/include?

Thanks
Wen Congyang
> 
>>>  AC_OUTPUT()
>>> diff -r bef729fc4336 -r c4c05e4e4e02 tools/libxl/Makefile
>>> --- a/tools/libxl/Makefile    Thu Jul 25 00:02:22 2013 -0700
>>> +++ b/tools/libxl/Makefile    Thu Jul 25 00:02:33 2013 -0700
>>> @@ -13,7 +13,7 @@ XLUMINOR = 0
>>>
>>>  CFLAGS += -Werror -Wno-format-zero-length -Wmissing-declarations \
>>>       -Wno-declaration-after-statement -Wformat-nonliteral
>>> -CFLAGS += -I. -fPIC
>>> +CFLAGS += -I. -fPIC -I /usr/local/include/libnl3/
>>
>> Means you should need to include the -I option here.
>>
>> David
>>
> 
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