configure: use move-if-change from gcc to create config.status. Some

makefiles depend on config.status to tell if a directory has been
reconfigured for a different host.  This change prevents those
directories from remaking everything in the case where the reconfig
was only intended to rebuild a Makefile.

diff --git a/ChangeLog b/ChangeLog
index 482c71e..e2d6120 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,11 @@
 Tue Apr 21 12:31:33 1992  K. Richard Pixley  (rich@cygnus.com)
 
+       * configure: use move-if-change from gcc to create config.status.
+         Some makefiles depend on config.status to tell if a directory
+         has been reconfigured for a different host.  This change
+         prevents those directories from remaking everything in the case
+         where the reconfig was only intended to rebuild a Makefile.
+
        * configure: test for config.sub with "config.sub sun4" rather
          than "config.sub ${host_alias}".  Otherwise we can't tell a bad
          host alias from a missing config.sub.

diff --git a/configure b/configure
index 97cf431..6446f47 100755 (executable)
--- a/configure
+++ b/configure
@@ -60,6 +60,7 @@ next_prefix=
 next_site=
 next_srcdir=
 next_target=
+moveifchange=
 next_tmpdir=
 norecursion=
 removing=
@@ -323,6 +324,7 @@ if [ -n "${fatal}" -o "${host_alias}" = "help" ] ; then
 fi
 
 configsub=`echo ${progname} | sed 's/configure$/config.sub/'`
+moveifchange=`echo ${progname} | sed 's/configure$/move-if-change/'`
 
 # this is a hack.  sun4 must always be a valid host alias or this will fail.
 if ${configsub} sun4 >/dev/null 2>&1 ; then
@@ -332,6 +334,15 @@ else
        exit 1
 fi
 
+touch config.junk
+if ${moveifchange} config.junk config.trash ; then
+       true
+else
+       echo '***' cannot find move-if-change.  1>&2
+       exit 1
+fi
+rm -f config.junk config.trash
+
 case "${srcdir}" in
 "")
        if [ -r configure.in ] ; then
@@ -495,6 +506,7 @@ for subdir in . ${subdirs} ; do
 
        # Make the links.
        configlinks="${links}"
+       mv -f config.status config.back
        while [ -n "${files}" ] ; do
                # set file to car of files, files to cdr of files
                set ${files}; file=$1; shift; files=$*
@@ -507,7 +519,6 @@ for subdir in . ${subdirs} ; do
                fi
 
                ${remove} -f ${link}
-               rm -f config.status
                # Make a symlink if possible, otherwise try a hard link
                ${symbolic_link} ${srcdir}/${file} ${link} 2>/dev/null || ${hard_link} ${srcdir}/${file} ${link}
 
@@ -697,16 +708,18 @@ EOF
 # ${NO_EDIT}
 # ${PWD} was configured as follows:
 ${progname}" ${arguments}  "
-# ${using}" > ${subdir}/config.status
+# ${using}" > ${subdir}/config.new
        else
            echo "#!/bin/sh
 # ${NO_EDIT}
 # ${PWD}/${subdir} was configured as follows:
 cd ${invsubdir}
 ${progname}" ${arguments}  "
-# ${using}" > ${subdir}/config.status
+# ${using}" > ${subdir}/config.new
        fi
-       chmod a+x ${subdir}/config.status
+       chmod a+x ${subdir}/config.new
+       mv -f config.back config.status
+       ${moveifchange} config.new config.back
        ;;
 
     *) rm -f ${Makefile} ${subdir}/config.status ${links} ;;