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authorMichael Forney <forney@google.com>2018-02-07 09:41:17 +0300
committerMasahiro Yamada <yamada.masahiro@socionext.com>2018-03-25 20:01:18 +0300
commit1fe7d2bb24d7db6175e0b0a31d8fe03dc6ffb16e (patch)
tree1d1acfa6039c3f4a51ea7032656d09f58bf14654 /scripts/Makefile.build
parentae0c553c24c009596c3a3e903433824fe050c547 (diff)
downloadlinux-1fe7d2bb24d7db6175e0b0a31d8fe03dc6ffb16e.tar.xz
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.build2
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