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List:       autoconf
Subject:    Re: library version number
From:       Philip Herron <herron.philip () googlemail ! com>
Date:       2009-04-15 17:05:13
Message-ID: 49E613C9.7030109 () googlemail ! com
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Bob Friesenhahn wrote:
> On Wed, 15 Apr 2009, Philip Herron wrote:
>> # Checks for libraries.
>> AC_CHECK_LIB([xml2],[xmlTextReaderGetAttribute])
>> if test "$xml2" = "no"
>> then
>>     AC_MSG_ERROR(["libxml2 is needed to be installed for ovf xml
>> reading.. Debian: apt-get intstall libxml2-dev, or SUSE:yast -i
>> libxml2-devel"])
>> else
>>     CFLAGS="$CFLAGS -I/usr/include/libxml2"
>> fi
>>
>> It seems to work ok i dont think i am doing it properly because the
>> libxml2 headers are like:
>>
>> /usr/include/libxml2/libxml/*.h
> 
> You are confusing different issues.  The libxml2 library and headers may
> be somewhere else rather than under /usr. In fact, several libxml2
> installs can exist at once.  That is why libxml2 provides a utility to
> find the location of the library and headers.
> 
> Any -I options should be put in CPPFLAGS and any -L options should be
> put in LDFLAGS.
> 
> Bob
> -- 
> Bob Friesenhahn
> bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
> GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/

Hey

Yeah i think your right i didnt really think about that. I now changed
it to:

C_PATH_PROGS([TOOL_XML2_CONFIG], [xml2-config])
    AS_IF([test -n "$TOOL_XML2_CONFIG"],
          [XML2_CFLAGS=`$TOOL_XML2_CONFIG --cflags`
           XML2_LIBS=`$TOOL_XML2_CONFIG --libs`],
          [AC_MSG_ERROR([missing program 'xml2-config'; is 'libxml2' or
'libxml2-devel' installed?])])
    AC_SUBST([XML2_CFLAGS])
    AC_SUBST([XML2_LIBS])

Just what luke@mewburn.net posted earlier! It works pretty well, i just
add to change it a little:

AC_PATH_PROGS([TOOL_XML2_CONFIG], [xml2-config])
    AS_IF([test -n "$TOOL_XML2_CONFIG"],
          [XML2_CFLAGS=`$TOOL_XML2_CONFIG --cflags`
           XML2_LIBS=`$TOOL_XML2_CONFIG --libs`
	   LIBXML_VERSION=`$TOOL_XML2_CONFIG --version`],
          [AC_MSG_ERROR([missing program 'xml2-config'; is 'libxml2' or
'libxml2-devel' installed?])])
    AC_SUBST([XML2_CFLAGS])
    AC_SUBST([XML2_LIBS])
AC_CHECK_LIB([xml2],[xmlTextReaderGetAttribute])
CFLAGS="$CFLAGS $XML2_CFLAGS"

Thanks very much guys

- -Phil

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