Use shell's builtin pwd.

Insisting on /bin/pwd is unnecessary nowadays.  Autoconf-generated
scripts have been using the shell's built-in "pwd" for a long time.`

ChangeLog

@@ -1,3 +1,10 @@
+2015-12-02  Ludovic Courtès  <ludo@gnu.org>
+
+	* configure.ac: Use 'pwd -P' instead of '/bin/pwd'.
+	* configure: Regenerate.
+	* io/ftwtest-sh: Use 'pwd -P' instead of '/bin/pwd'.
+	* scripts/rellns-sh: Likewise.  Remove 'pwd' variable.
+
 2015-12-02  Carlos O'Donell  <carlos@redhat.com>
 
 	* iconvdata/ibm930.c: Add comment explaining encoding uses.

configure

@@ -3228,7 +3228,7 @@ if test $libc_cv_cxx_link_ok != yes; then :
   CXX=
 fi
 
-if test "`cd $srcdir; /bin/pwd`" = "`/bin/pwd`"; then
+if test "`cd $srcdir; pwd -P`" = "`pwd -P`"; then
   as_fn_error $? "you must configure in a separate build directory" "$LINENO" 5
 fi
 

configure.ac

@@ -80,7 +80,7 @@ LDFLAGS="$old_LDFLAGS"
 AC_LANG_POP([C++])])
 AS_IF([test $libc_cv_cxx_link_ok != yes], [CXX=])
 
-if test "`cd $srcdir; /bin/pwd`" = "`/bin/pwd`"; then
+if test "`cd $srcdir; pwd -P`" = "`pwd -P`"; then
   AC_MSG_ERROR([you must configure in a separate build directory])
 fi
 

io/ftwtest-sh

@@ -135,7 +135,7 @@ $testprogram --chdir $tmpdir |
     sort > $testout
 
 # perhaps $tmp involves some symlinks...
-tmpreal=`cd $tmp; /bin/pwd 2>/dev/null || /usr/bin/pwd`
+tmpreal=`cd $tmp; pwd -P 2>/dev/null`
 
 cat <<EOF | cmp $testout - || exit 1
 base = "$tmp/", file = "ftwtest.d", flag = FTW_D, cwd = $tmpreal, level = 0
@@ -153,7 +153,7 @@ base = "$tmp/ftwtest.d/foo/lvl1/lvl2/lvl3/", file = "file@3", flag = FTW_F, cwd
 EOF
 rm $testout
 
-curwd=`/bin/pwd 2>/dev/null || /usr/bin/pwd`
+curwd=`pwd -P 2>/dev/null`
 cd "$tmp"
 $testprogram --chdir ftwtest.d |
     sort > $testout
@@ -175,7 +175,7 @@ base = "ftwtest.d/foo/lvl1/lvl2/lvl3/", file = "file@3", flag = FTW_F, cwd = $tm
 EOF
 rm $testout
 
-curwd=`/bin/pwd 2>/dev/null || /usr/bin/pwd`
+curwd=`pwd -P`
 cd "$tmp"
 $testprogram --chdir ftwtest.d/. |
     sort > $testout
@@ -197,7 +197,7 @@ base = "ftwtest.d/./foo/lvl1/lvl2/lvl3/", file = "file@3", flag = FTW_F, cwd = $
 EOF
 rm $testout
 
-curwd=`/bin/pwd 2>/dev/null || /usr/bin/pwd`
+curwd=`pwd -P 2>/dev/null`
 cd "$tmp"
 $testprogram --chdir ftwtest.d/foo/lvl1/link@1 |
     sort > $testout

scripts/rellns-sh

@@ -30,23 +30,15 @@ if test $# -ne 2; then
   exit 1
 fi
 
-if test -x /bin/pwd; then
-  pwd=/bin/pwd
-elif test -x /usr/bin/pwd; then
-  pwd=/usr/bin/pwd
-else
-  pwd='pwd'
-fi
-
 # Make both paths absolute.
 if test -d $1; then
-  to=`cd $1 && $pwd`
+  to=`cd $1 && pwd -P`
 else
   temp=`echo $1 | sed 's%/*[^/]*$%%'`
   if test -z "$temp"; then
-    to=`$pwd`
+    to=`pwd -P`
   else
-    to=`cd $temp && $pwd`
+    to=`cd $temp && pwd -P`
   fi
   to="$to/`echo $1 | sed 's%.*/\([^/][^/]*\)$%\1%'`"
 fi
@@ -59,9 +51,9 @@ else
 fi
 
 if test -z "$from"; then
-  from=`$pwd | sed 's%^/%%'`
+  from=`pwd -P | sed 's%^/%%'`
 else
-  from=`cd $from && $pwd | sed 's%^/%%'`
+  from=`cd $from && pwd -P | sed 's%^/%%'`
 fi
 
 while test -n "$to" && test -n "$from"; do