Re: Checking Installed library

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On Sat, Jul 18, 2009 at 1:45 PM, Rishi Agrawal<rishi.b.agrawal@xxxxxxxxx> wrote:
>
>
> On Sat, Jul 18, 2009 at 1:05 PM, Manish Katiyar <mkatiyar@xxxxxxxxx> wrote:
>>
>> On Sat, Jul 18, 2009 at 9:48 AM, Rishi Agrawal<rishi.b.agrawal@xxxxxxxxx>
>> wrote:
>> >
>> >
>> > On Fri, Jul 17, 2009 at 7:22 PM, Manish Katiyar <mkatiyar@xxxxxxxxx>
>> > wrote:
>> >>
>> >> On Fri, Jul 17, 2009 at 10:34 PM, Rishi
>> >> Agrawal<rishi.b.agrawal@xxxxxxxxx> wrote:
>> >> >
>> >> >
>> >> > On Fri, Jul 17, 2009 at 12:40 PM, Rishi Agrawal
>> >> > <rishi.b.agrawal@xxxxxxxxx>
>> >> > wrote:
>> >> >>
>> >> >>
>> >> >> On Fri, Jul 17, 2009 at 12:27 PM, Mulyadi Santosa
>> >> >> <mulyadi.santosa@xxxxxxxxx> wrote:
>> >> >>>
>> >> >>> On 7/17/09, Rishi Agrawal <rishi.b.agrawal@xxxxxxxxx> wrote:
>> >> >>> > Is autoconfigure the only way to find this out.??
>> >> >>> >
>> >> >>> > On Wed, Jul 15, 2009 at 6:52 AM, Pei Lin <telent997@xxxxxxxxx>
>> >> >>> > wrote:
>> >> >>>
>> >> >>> Please don't do top posting...
>> >> >>>
>> >> >>> Although it's OOT, I can help a bit. IMO, you can directly check
>> >> >>> /usr/lib or parse /etc/ld.so.conf and so on to find the related DSO
>> >> >>> and header files. However, doing that will require more time and
>> >> >>> probably not portable across system, in fact it's kinda reinventing
>> >> >>> the wheel.
>> >> >>>
>> >> >>> So, I personally suggest to adopt autoconfigure.
>> >> >>>
>> >> >>> --
>> >> >>> regards,
>> >> >>>
>> >> >>> Mulyadi Santosa
>> >> >>> Freelance Linux trainer
>> >> >>> blog: the-hydra.blogspot.com
>> >> >>
>> >> >>
>> >> >> I will have a detailed look at the autoconfigure utility and see.
>> >> >>
>> >> >> Thanks for all the help.
>> >> >>
>> >> >> --
>> >> >> Regards,
>> >> >> Rishi B. Agrawal
>> >> >> http://www.linkedin.com/in/rishibagrawal
>> >> >> http://code.google.com/p/fscops/
>> >> >
>> >> >
>> >> > I have used it and it is working very good.
>> >> >
>> >> > I wanted to know that
>> >> >
>> >> > How to check the presence of libxml2 library using autoconfigure ?
>> >>
>> >> First link in google.
>> >>
>> >>
>> >>
>> >> http://www.kdevelop.org/index.html?filename=3.0/doc/tutorial_autoconf.html
>> >>
>> >> Thanks -
>> >> Manish
>> >>
>> >> >
>> >> >
>> >> > --
>> >> > Regards,
>> >> > Rishi B. Agrawal
>> >> > http://www.linkedin.com/in/rishibagrawal
>> >> > http://code.google.com/p/fscops/
>> >> >
>> >>
>> >>
>> >>
>> >> --
>> >> Thanks -
>> >> Manish
>> >
>> > Actually I tried using that information earlier but somehow it did not
>> > work.
>>
>> Can you please tell us a little more why it didn't work ? Any errors
>> or anything else ??
>>
>> >
>> > Currently I am using a macro which checks wether a function is present
>> > in
>> > the mentioned library.
>>
>> I didn't understand this ? are you using something like nm ??
>>
>> >
>> > like printf can be checked in libc
>> >
>> > I used a function "xmlParsefile" and "libxml2" library and this works
>> > fine.
>> > The logic behind this is that when the function is present in the
>> > library
>> > then the library is also present on the system (is it correct ??)
>>
>> Should be... but by any chance are you relying the library to be
>> present in a particular path ?? If that's the case it is not going to
>> work anywhere ?
>>
>> Thanks -
>> Manish
>>
>> >
>> >
>> >
>> >
>> >
>> >
>> > --
>> > Regards,
>> > Rishi B. Agrawal
>> > http://www.linkedin.com/in/rishibagrawal
>> > http://code.google.com/p/fscops/
>> >
>>
>>
>>
>> --
>> Thanks -
>> Manish
>
> I am using this particular line:
>
> AC_CHECK_LIB(xml2,xmlParseFile,,AC_MSG_ERROR(oops! no function xmlParseFile
> function in xml?!?),) in my configure.in for autoconf

You can try something like below too ... it doesn't depend on any
particular function.

/tmp/test> ./configure
checking for gcc... gcc
checking for C compiler default output file name... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables...
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking for -pkg-config... no
checking for pkg-config... /usr/bin/pkg-config
checking for libxml2... yes
configure: creating ./config.status


/tmp/test> cat configure.ac
#                                               -*- Autoconf -*-
# Process this file with autoconf to produce a configure script.

AC_PREREQ([2.63])
AC_INIT(["Sample test package"], ["1.1.0"], ["mkatiyar@xxxxxxxxx"])
AC_CONFIG_SRCDIR([a.c])

AC_PROG_CC

AC_PATH_PROGS([PACKAGE_CONFIG], [$host_alias-pkg-config pkg-config], [none])
if test "x$PACKAGE_CONFIG" = "xnone"; then
  AC_MSG_ERROR([*** pkg-config, needed to check for libxml2 existence
has not been found.])
fi

AC_MSG_CHECKING(for libxml2)

if $PACKAGE_CONFIG libxml-2.0 --libs > /dev/null 2>&1; then
  AC_MSG_RESULT(yes)
else
  AC_MSG_RESULT(no)
fi

AC_OUTPUT

=====================================

Thanks -
Manish

>
> The use of macro is
>
> AC_CHECK_LIB : Checks whether a function exists in the given library
> (library names without the leading lib, e.g., for libxml, use just xml here)
>
> It seems that it is not path dependant.
> --
> Regards,
> Rishi B. Agrawal
> http://www.linkedin.com/in/rishibagrawal
> http://code.google.com/p/fscops/
>



-- 
Thanks -
Manish

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