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[PATCH] kbuild: describe Kbuild pitfall

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Whitespace is significant for make, and I just fought against this... so
please apply this patch.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
This commit is contained in:
Paolo 'Blaisorblade' Giarrusso 2005-07-28 17:56:17 +02:00 committed by Sam Ravnborg
parent 61d9cdf2a9
commit 49490571bc
1 changed files with 6 additions and 0 deletions
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6
Documentation/kbuild/makefiles.txt
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@ -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.