build: reconfigure automatically if configure.ac changes

This provides a reduced but still useful sibling of the Automake's
"automatic Makefile rebuild" feature.  It's important to note that
we take care to enable the new rules only if the tree that has already
be configured with './configure', so that users relying on manual
configuration won't be negatively impacted.

Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Makefile

@@ -2158,6 +2158,18 @@ configure: configure.ac GIT-VERSION-FILE
 	autoconf -o $@ $<+ && \
 	$(RM) $<+
 
+ifdef AUTOCONFIGURED
+config.status: configure
+	$(QUIET_GEN)if test -f config.status; then \
+	  ./config.status --recheck; \
+	else \
+	  ./configure; \
+	fi
+reconfigure config.mak.autogen: config.status
+	$(QUIET_GEN)./config.status
+.PHONY: reconfigure # This is a convenience target.
+endif
+
 XDIFF_OBJS += xdiff/xdiffi.o
 XDIFF_OBJS += xdiff/xprepare.o
 XDIFF_OBJS += xdiff/xutils.o

configure.ac

@@ -148,6 +148,8 @@ AC_CONFIG_SRCDIR([git.c])
 config_file=config.mak.autogen
 config_in=config.mak.in
 
+GIT_CONF_SUBST([AUTOCONFIGURED], [YesPlease])
+
 # Directories holding "saner" versions of common or POSIX binaries.
 AC_ARG_WITH([sane-tool-path],
   [AS_HELP_STRING(