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

[Shriram Rajagopalan <rshriram@xxxxxxxxx>]

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 ?

>>  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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