From 7f1b69763272f9d07e612309f53190da0c97ca70 Mon Sep 17 00:00:00 2001 From: Jeff King Date: Thu, 21 Feb 2013 01:26:14 -0500 Subject: [PATCH] Makefile: avoid infinite loop on configure.ac change If you are using autoconf and change the configure.ac, the Makefile will notice that config.status is older than configure.ac, and will attempt to rebuild and re-run the configure script to pick up your changes. The first step in doing so is to run "make configure". Unfortunately, this tries to include config.mak.autogen, which depends on config.status, which depends on configure.ac; so we must rebuild config.status. Which leads to us running "make configure", and so on. It's easy to demonstrate with: make configure ./configure touch configure.ac make We can break this cycle by not re-invoking make to build "configure", and instead just putting its rules inline into our config.status rebuild procedure. We can avoid a copy by factoring the rules into a make variable. Signed-off-by: Jeff King Signed-off-by: Junio C Hamano --- Makefile | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/Makefile b/Makefile index 8dc2dbc2ee..b51b564162 100644 --- a/Makefile +++ b/Makefile @@ -2159,12 +2159,14 @@ $(patsubst %.py,%,$(SCRIPT_PYTHON)): % : unimplemented.sh mv $@+ $@ endif # NO_PYTHON +CONFIGURE_RECIPE = $(RM) configure configure.ac+ && \ + sed -e 's/@@GIT_VERSION@@/$(GIT_VERSION)/g' \ + configure.ac >configure.ac+ && \ + autoconf -o configure configure.ac+ && \ + $(RM) configure.ac+ + configure: configure.ac GIT-VERSION-FILE - $(QUIET_GEN)$(RM) $@ $<+ && \ - sed -e 's/@@GIT_VERSION@@/$(GIT_VERSION)/g' \ - $< > $<+ && \ - autoconf -o $@ $<+ && \ - $(RM) $<+ + $(QUIET_GEN)$(CONFIGURE_RECIPE) ifdef AUTOCONFIGURED # We avoid depending on 'configure' here, because it gets rebuilt @@ -2173,7 +2175,7 @@ ifdef AUTOCONFIGURED # do want to recheck when the platform/environment detection logic # changes, hence this depends on configure.ac. config.status: configure.ac - $(QUIET_GEN)$(MAKE) configure && \ + $(QUIET_GEN)$(CONFIGURE_RECIPE) && \ if test -f config.status; then \ ./config.status --recheck; \ else \