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authorMichael Forney <forney@google.com>2018-02-06 22:41:17 -0800
committerMasahiro Yamada <yamada.masahiro@socionext.com>2018-03-26 02:01:18 +0900
commit1fe7d2bb24d7db6175e0b0a31d8fe03dc6ffb16e (patch)
tree1d1acfa6039c3f4a51ea7032656d09f58bf14654 /arch/Kconfig
parentkbuild: add clang-version.sh (diff)
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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>
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