Do not overwrite config.status while executing it.

* Makefile.in (MAKEFILE_NAME): New macro.
($(MAKEFILE_NAME)): Rename rule from Makefile.
* configure.ac (epaths): Set MAKEFILE_NAME to a bogus value,
so that GNU 'make' isn't tempted to make the Makefile and then
regenerate config.status while config.status is running.

Fixes: debbugs:11214

ChangeLog

 2012-07-30  Paul Eggert  <eggert@cs.ucla.edu>
 
+	Do not overwrite config.status while executing it (Bug#11214).
+	* Makefile.in (MAKEFILE_NAME): New macro.
+	($(MAKEFILE_NAME)): Rename rule from Makefile.
+	* configure.ac (epaths): Set MAKEFILE_NAME to a bogus value,
+	so that GNU 'make' isn't tempted to make the Makefile and then
+	regenerate config.status while config.status is running.
+
 	Update .PHONY listings in makefiles.
 	* Makefile.in (.PHONY): Add all, ${SUBDIR}, blessmail, epath-force,
 	FRC, install-arch-dep, install-arch-indep, install-doc,

Makefile.in

@@ -350,7 +350,12 @@ blessmail: Makefile src FRC
 # We used to have one rule per */Makefile.in, but that leads to race
 # conditions with parallel makes, so let's assume that the time stamp on
 # ./Makefile is representative of the time stamp on all the other Makefiles.
-Makefile: config.status $(srcdir)/src/config.in \
+#
+# config.status overrides MAKEFILE_NAME with a bogus name when creating
+# src/epaths.h, so that 'make epaths-force' does not recursively invoke
+# config.status and overwrite config.status while executing it (Bug#11214).
+MAKEFILE_NAME = Makefile
+$(MAKEFILE_NAME): config.status $(srcdir)/src/config.in \
           $(srcdir)/Makefile.in $(SUBDIR_MAKEFILES_IN)
 	./config.status
 

configure.ac

@@ -4464,7 +4464,7 @@ dnl by configure.  This also explains the `move-if-change' test and
 dnl the use of force in the `epaths-force' rule in Makefile.in.
 AC_CONFIG_COMMANDS([epaths], [
 echo creating src/epaths.h
-${MAKE-make} epaths-force
+${MAKE-make} MAKEFILE_NAME=do-not-make-Makefile epaths-force
 ], [GCC="$GCC" CPPFLAGS="$CPPFLAGS"])
 
 AC_CONFIG_COMMANDS([gdbinit], [