Documentation: kbuild: Improve if_changed documentation
- These days if_changed is used with many more commands than ld,
objcopy, and gzip, hence add an ellipsis,
- Any target that utilises if_changed must be listed in $(targets),
so it needs an assignment to "targets", not "target".
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Michal Marek <mmarek@suse.cz>
diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt
index a445e1c..520b2c7 100644
--- a/Documentation/kbuild/makefiles.txt
+++ b/Documentation/kbuild/makefiles.txt
@@ -1092,7 +1092,7 @@
Usage:
target: source(s) FORCE
- $(call if_changed,ld/objcopy/gzip)
+ $(call if_changed,ld/objcopy/gzip/...)
When the rule is evaluated, it is checked to see if any files
need an update, or the command line has changed since the last
@@ -1110,7 +1110,7 @@
significant; for instance, the below will fail (note the extra space
after the comma):
target: source(s) FORCE
- #WRONG!# $(call if_changed, ld/objcopy/gzip)
+ #WRONG!# $(call if_changed, ld/objcopy/gzip/...)
ld
Link target. Often, LDFLAGS_$@ is used to set specific options to ld.
@@ -1142,7 +1142,7 @@
The ": %: %.o" part of the prerequisite is a shorthand that
free us from listing the setup.o and bootsect.o files.
- Note: It is a common mistake to forget the "target :=" assignment,
+ Note: It is a common mistake to forget the "targets :=" assignment,
resulting in the target file being recompiled for no
obvious reason.