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authorMasahiro Yamada <masahiroy@kernel.org>2022-06-08 10:11:00 +0900
committerMasahiro Yamada <masahiroy@kernel.org>2022-06-10 03:47:13 +0900
commitda4288b95baa1c7c9aa8a476f58b37eb238745b0 (patch)
tree4730da2d97ddcfaae4224786c2ecb88c7c337d43 /Documentation
parent49c3ca34f7dbe5227c0163cba4deb5d29e145fae (diff)
scripts/check-local-export: avoid 'wait $!' for process substitution
Bash 4.4, released in 2016, supports 'wait $!' to check the exit status of a process substitution, but it seems too new. Some people using older bash versions (on CentOS 7, Ubuntu 16.04, etc.) reported an error like this: ./scripts/check-local-export: line 54: wait: pid 17328 is not a child of this shell I used the process substitution to avoid a pipeline, which executes each command in a subshell. If the while-loop is executed in the subshell context, variable changes within are lost after the subshell terminates. Fortunately, Bash 4.2, released in 2011, supports the 'lastpipe' option, which makes the last element of a pipeline run in the current shell process. Switch to the pipeline with 'lastpipe' solution, and also set 'pipefail' to catch errors from ${NM}. Add the bash requirement to Documentation/process/changes.rst. Fixes: 31cb50b5590f ("kbuild: check static EXPORT_SYMBOL* by script instead of modpost") Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Reported-by: Michael Ellerman <mpe@ellerman.id.au> Reported-by: Wang Yugui <wangyugui@e16-tech.com> Tested-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Tested-by: Jon Hunter <jonathanh@nvidia.com> Acked-by: Nick Desaulniers <ndesaulniers@google.com> Tested-by: Sedat Dilek <sedat.dilek@gmail.com> # LLVM-14 (x86-64) Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/process/changes.rst12
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/process/changes.rst b/Documentation/process/changes.rst
index 34415ae1af1b..19c286c23786 100644
--- a/Documentation/process/changes.rst
+++ b/Documentation/process/changes.rst
@@ -32,6 +32,7 @@ you probably needn't concern yourself with pcmciautils.
GNU C 5.1 gcc --version
Clang/LLVM (optional) 11.0.0 clang --version
GNU make 3.81 make --version
+bash 4.2 bash --version
binutils 2.23 ld -v
flex 2.5.35 flex --version
bison 2.0 bison --version
@@ -84,6 +85,12 @@ Make
You will need GNU make 3.81 or later to build the kernel.
+Bash
+----
+
+Some bash scripts are used for the kernel build.
+Bash 4.2 or newer is needed.
+
Binutils
--------
@@ -362,6 +369,11 @@ Make
- <ftp://ftp.gnu.org/gnu/make/>
+Bash
+----
+
+- <ftp://ftp.gnu.org/gnu/bash/>
+
Binutils
--------