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Annotation of embedaddon/libiconv/srcm4/double-slash-root.m4, revision 1.1.1.2

1.1       misho       1: # double-slash-root.m4 serial 4   -*- Autoconf -*-
1.1.1.2 ! misho       2: dnl Copyright (C) 2006, 2008-2019 Free Software Foundation, Inc.
1.1       misho       3: dnl This file is free software; the Free Software Foundation
                      4: dnl gives unlimited permission to copy and/or distribute it,
                      5: dnl with or without modifications, as long as this notice is preserved.
                      6: 
                      7: AC_DEFUN([gl_DOUBLE_SLASH_ROOT],
                      8: [
                      9:   AC_REQUIRE([AC_CANONICAL_HOST])
                     10:   AC_CACHE_CHECK([whether // is distinct from /], [gl_cv_double_slash_root],
                     11:     [ if test x"$cross_compiling" = xyes ; then
                     12:         # When cross-compiling, there is no way to tell whether // is special
                     13:         # short of a list of hosts.  However, the only known hosts to date
                     14:         # that have a distinct // are Apollo DomainOS (too old to port to),
                     15:         # Cygwin, and z/OS.  If anyone knows of another system for which // has
                     16:         # special semantics and is distinct from /, please report it to
                     17:         # <bug-gnulib@gnu.org>.
                     18:         case $host in
                     19:           *-cygwin | i370-ibm-openedition)
                     20:             gl_cv_double_slash_root=yes ;;
                     21:           *)
                     22:             # Be optimistic and assume that / and // are the same when we
                     23:             # don't know.
                     24:             gl_cv_double_slash_root='unknown, assuming no' ;;
                     25:         esac
                     26:       else
                     27:         set x `ls -di / // 2>/dev/null`
                     28:         if test "$[2]" = "$[4]" && wc //dev/null >/dev/null 2>&1; then
                     29:           gl_cv_double_slash_root=no
                     30:         else
                     31:           gl_cv_double_slash_root=yes
                     32:         fi
                     33:       fi])
                     34:   if test "$gl_cv_double_slash_root" = yes; then
                     35:     AC_DEFINE([DOUBLE_SLASH_IS_DISTINCT_ROOT], [1],
                     36:       [Define to 1 if // is a file system root distinct from /.])
                     37:   fi
                     38: ])