Add NO_VERSION to avoid rebuilding ceph_ver.h and relinking

Signed-off-by: Dan Mick <dan.mick@inktank.com>

src/Makefile.am

@@ -276,8 +276,19 @@ base: core-daemons admin-tools \
 FORCE:
 .git_version: FORCE
 	$(srcdir)/check_version $(srcdir)/.git_version
+
+# if NO_VERSION is set, only generate a new ceph_ver.h if there currently 
+# is none, and call "make_version -n" to fill it with a fixed string.
+# Otherwise, set it from the contents of .git_version.
+
 ceph_ver.h: .git_version
-	$(srcdir)/make_version $(srcdir)/.git_version ./ceph_ver.h
+	if [ -n "$$NO_VERSION" ] ; then \
+	    if [ ! -f ./ceph_ver.h ] ; then \
+	        $(srcdir)/make_version -n ./ceph_ver.h ; \
+	    fi; \
+        else \
+	    $(srcdir)/make_version $(srcdir)/.git_version ./ceph_ver.h ; \
+	fi
 
 ceph_ver.c: ./ceph_ver.h
 common/version.cc: ./ceph_ver.h

src/make_version

@@ -1,7 +1,14 @@
 #!/bin/sh
 
-cur=`head -1 $1`
-v=`tail -1 $1 | cut -c 2-`
+echo '$1: '$1
+
+if [ "$1" =  "-n" ] ; then
+   cur="no_version"
+   v="Development"
+else
+   cur=`head -1 $1`
+   v=`tail -1 $1 | cut -c 2-`
+fi
 
 print_all() {
 	echo "#ifndef CEPH_VERSION_H"