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kbuild: Add a space after ! to prevent parsing as file pattern

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Some shells use !(pattern|...|pattern) to match file names not
containing the specified patterns. This may result in output like

  $ ./scripts/clang-version.sh gcc
  ./scripts/clang-version.sh[18]: COPYING: not found
  printf: %d __clang_major__: conversion error
  printf: %d __clang_minor__: conversion error
  printf: %d __clang_patchlevel__: conversion error
  00000
  $

and set CONFIG_CLANG_VERSION to the invalid value '00000'.

POSIX says[0]

  If the pipeline begins with the reserved word ! and command1 is a
  subshell command, the application shall ensure that the ( operator at
  the beginning of command1 is separated from the ! by one or more
  <blank> characters. The behavior of the reserved word ! immediately
  followed by the ( operator is unspecified.

So, just add a <blank> to prevent this.

[0] http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_09_02

Signed-off-by: Michael Forney <mforney@mforney.org>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Michael Forney 2018-08-15 17:13:50 -07:00 committed by Masahiro Yamada
parent 1f3aa9002d
commit b5f8cb9e90
1 changed files with 1 additions and 1 deletions
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2
scripts/clang-version.sh
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@ -12,7 +12,7 @@
compiler="$*"
if !( $compiler --version | grep -q clang) ; then
if ! ( $compiler --version | grep -q clang) ; then
echo 0
exit 1
fi