Makefile: regenerate assembler listings when asked

'make var.s' fails to regenerate an assembler listing if var.c
has not changed but a header it includes has:

$ make var.s
CC var.s
$ touch cache.h
$ make var.s
$

The corresponding problem for 'make var.o' does not occur because
the Makefile lists dependencies for each .o target explicitly;
analogous dependency rules for the .s targets are not present.
Rather than add some, it seems better to force 'make' to always
regenerate assembler listings, since the assembler listing
targets are only invoked when specifically requested on the make
command line.

Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Makefile b/Makefile
index 015bfabb9cb2b47ffb5306691fefc73fbd2eb09f..36e6f812b37412f80cfa858cc08ae85195aa9d3f 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -1633,7 +1633,7 @@ git.o git.spec \
 
 %.o: %.c GIT-CFLAGS
        $(QUIET_CC)$(CC) -o $*.o -c $(ALL_CFLAGS) $<
-%.s: %.c GIT-CFLAGS
+%.s: %.c GIT-CFLAGS .FORCE-LISTING
        $(QUIET_CC)$(CC) -S $(ALL_CFLAGS) $<
 %.o: %.S GIT-CFLAGS
        $(QUIET_CC)$(CC) -o $*.o -c $(ALL_CFLAGS) $<
@@ -1978,7 +1978,7 @@ endif
 .PHONY: all install clean strip
 .PHONY: shell_compatibility_test please_set_SHELL_PATH_to_a_more_modern_shell
 .PHONY: .FORCE-GIT-VERSION-FILE TAGS tags cscope .FORCE-GIT-CFLAGS
-.PHONY: .FORCE-GIT-BUILD-OPTIONS
+.PHONY: .FORCE-GIT-BUILD-OPTIONS .FORCE-LISTING
 
 ### Check documentation
 #