m4 fixes

1 files changed, 35 insertions, 0 deletions

diff --git a/acinstall b/acinstall
new file mode 100755
index 000000000..e77fdf5a4
--- /dev/null
+++ b/acinstall
@@ -0,0 +1,35 @@
+#! /bin/sh
+
+# Install an aclocal-style M4 file.  A script is needed to do this
+# because we want to do serial-number checking; newer versions of
+# macro files should always be preferred.
+
+# Usage:
+#  acinstall file directory installprogram [install-args]...
+
+file="$1"
+dir="$2"
+shift
+shift
+
+localserial="`grep '^# serial' $file | sed -e 's/^# serial //g'`"
+if test -z "$localserial"; then
+   echo "acinstall: no serial number in $file" 1>&2
+   exit 1
+fi
+
+# Maybe if the installed file has no serial number we should just
+# assume it is ancient.
+instserial="`grep '^# serial' $dir/$file | sed -e 's/^# serial //g'`"
+if test -z "$instserial"; then
+   echo "acinstall: no serial number in $dir/$file" 1>&2
+   exit 1
+fi
+
+if test $localserial -lt $instserial; then
+   # Installed file is newer.
+   exit 0
+fi
+
+# Install the file.
+$* $file $dir/$file