# Copyright (C) 2003, 2004, 2005  Free Software Foundation, Inc.

#

# This file is free software; the Free Software Foundation

# gives unlimited permission to copy and/or distribute it,

# with or without modifications, as long as this notice is preserved.

# AM_PROG_MKDIR_P

# ---------------

# Check whether `mkdir -p' is supported, fallback to mkinstalldirs otherwise.

#

# Automake 1.8 used `mkdir -m 0755 -p --' to ensure that directories

# created by `make install' are always world readable, even if the

# installer happens to have an overly restrictive umask (e.g. 077).

# This was a mistake.  There are at least two reasons why we must not

# use `-m 0755':

#   - it causes special bits like SGID to be ignored,

#   - it may be too restrictive (some setups expect 775 directories).

#

# Do not use -m 0755 and let people choose whatever they expect by

# setting umask.

#

# We cannot accept any implementation of `mkdir' that recognizes `-p'.

# Some implementations (such as Solaris 8's) are not thread-safe: if a

# parallel make tries to run `mkdir -p a/b' and `mkdir -p a/c'

# concurrently, both version can detect that a/ is missing, but only

# one can create it and the other will error out.  Consequently we

# restrict ourselves to GNU make (using the --version option ensures

# this.)

AC_DEFUN([AM_PROG_MKDIR_P],

[if mkdir -p --version . >/dev/null 2>&1 && test ! -d ./--version; then

  # We used to keeping the `.' as first argument, in order to

  # allow $(mkdir_p) to be used without argument.  As in

  #   $(mkdir_p) $(somedir)

  # where $(somedir) is conditionally defined.  However this is wrong

  # for two reasons:

  #  1. if the package is installed by a user who cannot write `.'

  #     make install will fail,

  #  2. the above comment should most certainly read

  #     $(mkdir_p) $(DESTDIR)$(somedir)

  #     so it does not work when $(somedir) is undefined and

  #     $(DESTDIR) is not.

  #  To support the latter case, we have to write

  #     test -z "$(somedir)" || $(mkdir_p) $(DESTDIR)$(somedir),

  #  so the `.' trick is pointless.

  mkdir_p='mkdir -p --'

else

  # On NextStep and OpenStep, the `mkdir' command does not

  # recognize any option.  It will interpret all options as

  # directories to create, and then abort because `.' already

  # exists.

  for d in ./-p ./--version;

  do

    test -d $d && rmdir $d

  done

  # $(mkinstalldirs) is defined by Automake if mkinstalldirs exists.

  if test -f "$ac_aux_dir/mkinstalldirs"; then

    mkdir_p='$(mkinstalldirs)'

  else

    mkdir_p='$(install_sh) -d'

  fi

fi

AC_SUBST([mkdir_p])])