[PATCH] kbuild: describe Kbuild pitfall
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>
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Documentation/kbuild
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@ -872,7 +872,13 @@ When kbuild executes the following steps are followed (roughly):
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Assignments to $(targets) are without $(obj)/ prefix.
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if_changed may be used in conjunction with custom commands as
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defined in 6.7 "Custom kbuild commands".
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Note: It is a typical mistake to forget the FORCE prerequisite.
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Another common pitfall is that whitespace is sometimes
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significant; for instance, the below will fail (note the extra space
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after the comma):
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target: source(s) FORCE
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#WRONG!# $(call if_changed, ld/objcopy/gzip)
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ld
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Link target. Often LDFLAGS_$@ is used to set specific options to ld.
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