From da85ed425dc828ef4b8817f64d448101a88507b5 Mon Sep 17 00:00:00 2001
From: "Richard W.M. Jones" <rjones@redhat.com>
Date: Thu, 2 Jul 2009 11:29:00 +0100
Subject: [PATCH] Generator now runs automatically when it has changed.

---
 .gitignore       |  1 +
 HACKING          |  4 ----
 src/Makefile.am  | 19 ++++++++++++++++---
 src/generator.ml |  7 +++++++
 4 files changed, 24 insertions(+), 7 deletions(-)

diff --git a/.gitignore b/.gitignore
index 6c58e6f..fbb723f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -111,4 +111,5 @@ python/guestfs.pyc
 ruby/Rakefile
 ruby/ext/guestfs/extconf.h
 ruby/ext/guestfs/mkmf.log
+src/stamp-generator
 stamp-h1
diff --git a/HACKING b/HACKING
index fc9ed38..b42a807 100644
--- a/HACKING
+++ b/HACKING
@@ -14,10 +14,6 @@ etc. to the big list called 'functions' at the top of this file.
 'do_action' function.  Take a look at one of the numerous examples
 there.
 
-You will need to run src/generator.ml (from the top directory) which
-regenerates all the auto-generated files, and then continue with the
-ordinary build process.
-
 Formatting
 ----------------------------------------------------------------------
 
diff --git a/src/Makefile.am b/src/Makefile.am
index 06d4522..eb8723a 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -15,12 +15,25 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 
-EXTRA_DIST = guestfs_protocol.x \
+EXTRA_DIST = \
+	guestfs_protocol.x \
 	guestfs_protocol.c \
 	guestfs_protocol.h \
-	MAX_PROC_NR
+	MAX_PROC_NR \
+	stamp-generator \
+	generator.ml
 
-EXTRA_DIST += generator.ml
+# Rerun the generator if it has changed.
+# Git removes empty directories, so in cases where the
+# generator is creating the sole file in a directory, we
+# have to create the directory first.
+noinst_DATA = stamp-generator
+
+stamp-generator: generator.ml
+	mkdir -p $(top_srcdir)/perl/lib/Sys
+	cd .. && ocaml -warn-error A $(srcdir)/src/$<
+
+guestfs_protocol.x: stamp-generator
 
 include_HEADERS = guestfs.h guestfs-actions.h guestfs-structs.h
 
diff --git a/src/generator.ml b/src/generator.ml
index df5ff7e..766650f 100755
--- a/src/generator.ml
+++ b/src/generator.ml
@@ -8712,3 +8712,10 @@ Run it from the top source directory using the command
   let close = output_to "src/MAX_PROC_NR" in
   generate_max_proc_nr ();
   close ();
+
+  (* Always generate this file last, and unconditionally.  It's used
+   * by the Makefile to know when we must re-run the generator.
+   *)
+  let chan = open_out "src/stamp-generator" in
+  fprintf chan "1\n";
+  close_out chan
-- 
1.8.3.1