[fedora-java] Enhanced aot-compile script

[Andrew Haley]

Gary Benson writes:
 > Andrew Haley wrote:
 > > Gary Benson writes:
 > > > Andrew Haley wrote:
 > > > > The way this traditionally works in UNIX is by using `make'.
 > > > > 
 > > > > For example, to rebuild the mail database you simply go to
 > > > > /etc/mail and type
 > > > > 
 > > > >     make
 > > > > 
 > > > > which does whatever is necessary.
 > > > > 
 > > > > Why not do it this way with gcj's dependencies?  Just go into
 > > > > /var/lib/gcj<blah> and run make?  The makefile can then do
 > > > > everything that is necessary, using make's dependency analysis.
 > > > 
 > > > That's fine for sendmail, where everything in /etc/mail is owned by
 > > > sendmail.  GCJ can't know in advance what will be in /usr/lib/gcj, so
 > > > such a makefile would need to be edited or generated by something.
 > > 
 > > I don't think so.  All the makefile has to know is that the master
 > > db depends on *.db and *.so in some directory.
 > 
 > How would it cope with file deletions?

Use the directory as a dependency.  Any deletions will cause the
directory to be touched.

------------------------------------------------------------------------
bar: foo
	echo "update"
	touch bar
------------------------------------------------------------------------
 $ mkdir foo
 $ touch foo/baz
 $ make
echo "update"
update
touch bar
 $ make
make: `bar' is up to date.
 $ rm foo/baz
 $ make
echo "update"
update
touch bar

Andrew.