AC_PATH_GENERIC(LIBRARY [, MINIMUM-VERSION [, ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
, 

2001-03-16

Angus Lees <gusl@cse.unsw.edu.au>

GPLWithACException
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation. As a special exception, the respective Autoconf Macro's copyright owner gives unlimited permission to copy, distribute and modify the configure scripts that are the output of Autoconf when processing the Macro. You need not follow the terms of the GNU General Public License when using or distributing such scripts

cryp.to ac-archive's Miscellaneous (released)

Runs a LIBRARY-config script and defines LIBRARY_CFLAGS and LIBRARY_LIBS

The script must support `--cflags' and `--libs' args. If MINIMUM-VERSION is specified, the script must also support the `--version' arg. If the `--with-library-[exec-]prefix' arguments to ./configure are given, it must also support `--prefix' and `--exec-prefix'. (In other words, it must be like gtk-config.)

For example:

  AC_PATH_GENERIC(Foo, 1.0.0)

would run `foo-config --version' and check that it is at least 1.0.0

If so, the following would then be defined:

  FOO_CFLAGS to `foo-config --cflags`
  FOO_LIBS   to `foo-config --libs`

At present there is no support for additional "MODULES" (see AM_PATH_GTK) (shamelessly stolen from gtk.m4 and then hacked around a fair amount)

AC_DEFUN([AC_PATH_GENERIC],
[dnl
dnl we're going to need uppercase, lowercase and user-friendly versions of the
dnl string `LIBRARY'
pushdef([UP], translit([$1], [a-z], [A-Z]))dnl
pushdef([DOWN], translit([$1], [A-Z], [a-z]))dnl

dnl
dnl Get the cflags and libraries from the LIBRARY-config script
dnl
AC_ARG_WITH(DOWN-prefix,[  --with-]DOWN[-prefix=PFX       Prefix where $1 is installed (optional)],
        DOWN[]_config_prefix="$withval", DOWN[]_config_prefix="")
AC_ARG_WITH(DOWN-exec-prefix,[  --with-]DOWN[-exec-prefix=PFX Exec prefix where $1 is installed (optional)],
        DOWN[]_config_exec_prefix="$withval", DOWN[]_config_exec_prefix="")

  if test x$DOWN[]_config_exec_prefix != x ; then
     DOWN[]_config_args="$DOWN[]_config_args --exec-prefix=$DOWN[]_config_exec_prefix"
     if test x${UP[]_CONFIG+set} != xset ; then
       UP[]_CONFIG=$DOWN[]_config_exec_prefix/bin/DOWN-config
     fi
  fi
  if test x$DOWN[]_config_prefix != x ; then
     DOWN[]_config_args="$DOWN[]_config_args --prefix=$DOWN[]_config_prefix"
     if test x${UP[]_CONFIG+set} != xset ; then
       UP[]_CONFIG=$DOWN[]_config_prefix/bin/DOWN-config
     fi
  fi

  AC_PATH_PROG(UP[]_CONFIG, DOWN-config, no)
  ifelse([$2], ,
     AC_MSG_CHECKING(for $1),
     AC_MSG_CHECKING(for $1 - version >= $2)
  )
  no_[]DOWN=""
  if test "$UP[]_CONFIG" = "no" ; then
     no_[]DOWN=yes
  else
     UP[]_CFLAGS="`$UP[]_CONFIG $DOWN[]_config_args --cflags`"
     UP[]_LIBS="`$UP[]_CONFIG $DOWN[]_config_args --libs`"
     ifelse([$2], , ,[
        DOWN[]_config_major_version=`$UP[]_CONFIG $DOWN[]_config_args \
         --version | sed 's/[[^0-9]]*\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
        DOWN[]_config_minor_version=`$UP[]_CONFIG $DOWN[]_config_args \
         --version | sed 's/[[^0-9]]*\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`
        DOWN[]_config_micro_version=`$UP[]_CONFIG $DOWN[]_config_args \
         --version | sed 's/[[^0-9]]*\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`
        DOWN[]_wanted_major_version="regexp($2, [\<\([0-9]*\)], [\1])"
        DOWN[]_wanted_minor_version="regexp($2, [\<\([0-9]*\)\.\([0-9]*\)], [\2])"
        DOWN[]_wanted_micro_version="regexp($2, [\<\([0-9]*\).\([0-9]*\).\([0-9]*\)], [\3])"

        # Compare wanted version to what config script returned.
        # If I knew what library was being run, i'd probably also compile
        # a test program at this point (which also extracted and tested
        # the version in some library-specific way)
        if test "$DOWN[]_config_major_version" -lt \
                        "$DOWN[]_wanted_major_version" \
          -o \( "$DOWN[]_config_major_version" -eq \
                        "$DOWN[]_wanted_major_version" \
            -a "$DOWN[]_config_minor_version" -lt \
                        "$DOWN[]_wanted_minor_version" \) \
          -o \( "$DOWN[]_config_major_version" -eq \
                        "$DOWN[]_wanted_major_version" \
            -a "$DOWN[]_config_minor_version" -eq \
                        "$DOWN[]_wanted_minor_version" \
            -a "$DOWN[]_config_micro_version" -lt \
                        "$DOWN[]_wanted_micro_version" \) ; then
          # older version found
          no_[]DOWN=yes
          echo -n "*** An old version of $1 "
          echo -n "($DOWN[]_config_major_version"
          echo -n ".$DOWN[]_config_minor_version"
          echo    ".$DOWN[]_config_micro_version) was found."
          echo -n "*** You need a version of $1 newer than "
          echo -n "$DOWN[]_wanted_major_version"
          echo -n ".$DOWN[]_wanted_minor_version"
          echo    ".$DOWN[]_wanted_micro_version."
          echo "***"
          echo "*** If you have already installed a sufficiently new version, this error"
          echo "*** probably means that the wrong copy of the DOWN-config shell script is"
          echo "*** being found. The easiest way to fix this is to remove the old version"
          echo "*** of $1, but you can also set the UP[]_CONFIG environment to point to the"
          echo "*** correct copy of DOWN-config. (In this case, you will have to"
          echo "*** modify your LD_LIBRARY_PATH environment variable, or edit /etc/ld.so.conf"
          echo "*** so that the correct libraries are found at run-time)"
        fi
     ])
  fi
  if test "x$no_[]DOWN" = x ; then
     AC_MSG_RESULT(yes)
     ifelse([$3], , :, [$3])
  else
     AC_MSG_RESULT(no)
     if test "$UP[]_CONFIG" = "no" ; then
       echo "*** The DOWN-config script installed by $1 could not be found"
       echo "*** If $1 was installed in PREFIX, make sure PREFIX/bin is in"
       echo "*** your path, or set the UP[]_CONFIG environment variable to the"
       echo "*** full path to DOWN-config."
     fi
     UP[]_CFLAGS=""
     UP[]_LIBS=""
     ifelse([$4], , :, [$4])
  fi
  AC_SUBST(UP[]_CFLAGS)
  AC_SUBST(UP[]_LIBS)

  popdef([UP])
  popdef([DOWN])
])