[Dune] [#946] 'double free' error when local and installed versions of dune exist

[Dune]

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FS#946 - 'double free' error when local and installed versions of dune exist
User who did this - Elias Pipping (pipping)

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Well... that again is not quite surprising. The expansion is now done properly but the variable

  DUNE_LOCALFUNCTIONS_LIBDIR

is set to "". That's because the true-branch is taken in

  ifelse(_dune_symbol,,
        [_DUNE_MODULE[]_LIBDIR=""
         _dune_cm_LIBS=""],
        [_DUNE_MODULE[]_LIBDIR=`$PKG_CONFIG --variable=libdir _dune_name 2>/dev/null`
         _dune_cm_LIBS="-L$_DUNE_MODULE[]_LIBDIR -l[]_dune_lib"])

for dune-solvers but not other packages: dune.m4 sets _dune_symbol as follows:

    m4_pushdef([_dune_symbol], [$3])

or in other words to the third argument of the function call. dune-solvers (unlike other modules) comes with the following:

  AC_DEFUN([DUNE_SOLVERS_CHECK_MODULE],[
  DUNE_CHECK_MODULES([dune-solvers], [solvers/solvers/solver.hh])
])

leaving the third argument unset. I haven't dug into the logic of dune.m4 further to find out why the LIBDIR is only set if a third argument is passed.
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More information can be found at the following URL:
http://www.dune-project.org/flyspray/index.php?do=details&task_id=946#comment3526

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