diff options
| author | Michael Forney <forney@google.com> | 2018-02-06 22:41:17 -0800 |
|---|---|---|
| committer | Masahiro Yamada <yamada.masahiro@socionext.com> | 2018-03-26 02:01:18 +0900 |
| commit | 1fe7d2bb24d7db6175e0b0a31d8fe03dc6ffb16e (patch) | |
| tree | 1d1acfa6039c3f4a51ea7032656d09f58bf14654 /scripts/Makefile.build | |
| parent | ae0c553c24c009596c3a3e903433824fe050c547 (diff) | |
kbuild: Improve portability of some sed invocations
* Use BREs where EREs aren't necessary.
* Pass -E instead of -r to use EREs. This will be standardized in the
next POSIX revision[0]. GNU sed supports this since 4.2 (May 2009),
and busybox since 1.22.0 (Jan 2014).
* Use the [:space:] character class instead of ` \t` in bracket
expressions. In bracket expressions, POSIX says that <backslash> loses
its special meaning, so a conforming implementation cannot expand \t
to <tab>[1].
* In BREs, use interval expressions (\{n,m\}) instead of non-standard
features like \+ and \?.
* Use a loop instead of -s flag.
There are still plenty of other cases of non-standard sed invocations
(use of ERE features in BREs, in-place editing), but this fixes some
core ones.
[0] http://austingroupbugs.net/view.php?id=528
[1] http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html#tag_09_03_05
Signed-off-by: Michael Forney <forney@google.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Diffstat (limited to 'scripts/Makefile.build')
| -rw-r--r-- | scripts/Makefile.build | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/scripts/Makefile.build b/scripts/Makefile.build index 4f2b25d43ec9..fff770983960 100644 --- a/scripts/Makefile.build +++ b/scripts/Makefile.build @@ -314,7 +314,7 @@ endef # List module undefined symbols (or empty line if not enabled) ifdef CONFIG_TRIM_UNUSED_KSYMS -cmd_undef_syms = $(NM) $@ | sed -n 's/^ \+U //p' | xargs echo +cmd_undef_syms = $(NM) $@ | sed -n 's/^ *U //p' | xargs echo else cmd_undef_syms = echo endif |