[sr #110573] AR_CONFIG_AUX_DIR(S) does not recognize shell vars nor absolute paths

URL:
  <https://savannah.gnu.org/support/?110573>

                 Summary: AR_CONFIG_AUX_DIR(S) does not recognize shell vars
nor absolute paths
                 Project: Autoconf
            Submitted by: domson
            Submitted on: Tue 30 Nov 2021 05:31:46 PM CET
                Category: None
                Priority: 5 - Normal
                Severity: 3 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
        Operating System: GNU/Linux

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Details:

AR_CONFIG_AUX_DIR macro in general.m4 does seem to have insufficient regex,
and does therefore not correspond to its description which is

_# AC_CONFIG_AUX_DIR(DIR)
# ----------------------
# Find auxiliary scripts (e.g. install-sh, config.sub, config.guess)
# in DIR.  If DIR is a literal shell word and not an absolute path,
# it is interpreted relative to $srcdir; otherwise it is assumed to be
# usable as-is._

I experimented with a custom macro:


AC_DEFUN([MY_CONFIG_AUX_DIR],
  [m4_append_uniq([_AC_AUX_DIR_CANDIDATES],
    AS_LITERAL_WORD_IF([$1],
      [m4_bmatch([$1],
                 [^/.*],       [$1],      # added '.*' suffix
                 [^[a-z]:/], [$1],        # is that to match shell vars?
                            [${srcdir}/$1])],
      [$1]),
    [${PATH_SEPARATOR}])])







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