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kbuild: add comment about why cmd_shipped uses 'cat'

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cmd_shipped uses 'cat' instead of 'cp' for copying a file. The reason
is explained in the commit [1], but it was in the pre-git era.

  $ touch a
  $ chmod -w a
  $ cp a b
  $ cp a b
  cp: cannot create regular file 'b': Permission denied

Add comments so that you can see the reason without looking into
the history.

[1]: https://git.kernel.org/pub/scm/linux/kernel/git/history/history.git/commit/?id=a70dba8086160449cc94c5bdaff78419b6b8e3c8

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Masahiro Yamada 2021-04-24 20:55:53 +09:00
parent c5849b7c20
commit 3787b7da5d
1 changed files with 3 additions and 0 deletions
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3
scripts/Makefile.lib
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@ -252,6 +252,9 @@ quiet_cmd_copy = COPY $@
# Shipped files
# ===========================================================================
# 'cp' preserves permissions. If you use it to copy a file in read-only srctree,
# the copy would be read-only as well, leading to an error when executing the
# rule next time. Use 'cat' instead in order to generate a writable file.
quiet_cmd_shipped = SHIPPED $@
cmd_shipped = cat $< > $@