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-rw-r--r--Documentation/kbuild/makefiles.txt6
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt
index 2616a58..9a15865 100644
--- a/Documentation/kbuild/makefiles.txt
+++ b/Documentation/kbuild/makefiles.txt
@@ -872,7 +872,13 @@ When kbuild executes the following steps are followed (roughly):
Assignments to $(targets) are without $(obj)/ prefix.
if_changed may be used in conjunction with custom commands as
defined in 6.7 "Custom kbuild commands".
+
Note: It is a typical mistake to forget the FORCE prerequisite.
+ Another common pitfall is that whitespace is sometimes
+ significant; for instance, the below will fail (note the extra space
+ after the comma):
+ target: source(s) FORCE
+ #WRONG!# $(call if_changed, ld/objcopy/gzip)
ld
Link target. Often LDFLAGS_$@ is used to set specific options to ld.