Add commit hash tracking

Author: fyshhh

Makefile.in

@@ -58,16 +58,34 @@ MANPAGES=dmtcp.1.gz dmtcp_coordinator.1.gz dmtcp_command.1.gz \
 include Makefile.versions
 
 VERSION_HEADER := include/version.h
+GITID_FILE     := .gitid
+GITID          := $(shell if [ -d ".git" ]; then git describe --always; fi)
 
-$(VERSION_HEADER): Makefile.versions
+# Git repository wasn't inited in MANA folder
+ifeq ($(GITID),)
+        GITID := 0
+else
+        GITID_FILE_VALUE := $(shell if [ -f '$(GITID_FILE)' ]; then if [ `cat '$(GITID_FILE)'` = $(GITID) ]; then echo y; fi; fi)
+        ifneq ($(GITID_FILE_VALUE),y)
+                .PHONY: $(GITID_FILE)
+        endif
+endif
+
+$(GITID_FILE):
+	echo "$(GITID)" > $(GITID_FILE)
+
+$(VERSION_HEADER): Makefile.versions $(GITID_FILE) .FORCE
 	echo "/* Autogenerated, do not edit */"                    > $@
 	echo "#ifndef __MANA_VERSION_H__"                         >> $@
 	echo "# define __MANA_VERSION_H__"                        >> $@
 	echo "# define MANA_VERSION " $(MANA_VERSION)             >> $@
 	echo "# define MANA_VERSION_MAJOR " $(MANA_VERSION_MAJOR) >> $@
 	echo "# define MANA_VERSION_MINOR " $(MANA_VERSION_MINOR) >> $@
+	echo "# define MANA_VERSION_GITID " $(GITID)              >> $@
 	echo "#endif /* __MANA_VERSION_H__ */"                    >> $@
 
+.FORCE: 
+
 # Macros TEST and XTERM_E used on command line by check1, check2, ...:
 #   make TEST=readline XTERM_E="xterm -e" check-readline