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| author | Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> | 2005-07-28 17:56:17 +0200 |
|---|---|---|
| committer | Sam Ravnborg <sam@mars.(none)> | 2005-07-28 22:58:21 +0200 |
| commit | 49490571bcfe24d279a66ba24198e8ba299fe58f (patch) | |
| tree | 785dbe57e3c066761cea42b97cedb4504e08ce7b /Documentation/kbuild | |
| parent | 61d9cdf2a9ccb9e4770d7723db8b18b8952778ce (diff) | |
| download | lwn-49490571bcfe24d279a66ba24198e8ba299fe58f.tar.gz lwn-49490571bcfe24d279a66ba24198e8ba299fe58f.zip | |
[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>
Diffstat (limited to 'Documentation/kbuild')
| -rw-r--r-- | Documentation/kbuild/makefiles.txt | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt index 2616a58a5a4b..9a1586590d82 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. |