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| author | Masahiro Yamada <masahiroy@kernel.org> | 2019-12-06 16:03:02 +0300 |
|---|---|---|
| committer | Masahiro Yamada <masahiroy@kernel.org> | 2019-12-14 09:53:04 +0300 |
| commit | c8f3dea90e38194dae542c5d56e05d30447e58cb (patch) | |
| tree | 4d5b81e9741caf4f54e7e05bd37a9196c5e35dd1 /scripts | |
| parent | e8193650bf38bf531f19de36ae3afdee32627191 (diff) | |
| download | linux-c8f3dea90e38194dae542c5d56e05d30447e58cb.tar.xz | |
mkcompile_h: use printf for LINUX_COMPILE_BY
Commit 858805b336be ("kbuild: add $(BASH) to run scripts with
bash-extension") shed light on portability issues. Here is another one.
Since commit f07726048d59 ("Fix handling of backlash character in
LINUX_COMPILE_BY name"), we must escape a backslash contained in
LINUX_COMPILE_BY. This is not working on such distros as Ubuntu.
As the POSIX spec [1] says, if any of the operands contain a backslash
( '\' ) character, the results are implementation-defined.
The actual shell of /bin/sh could be bash, dash, etc. depending on
distros, and the behavior of builtin echo command is different among
them.
The bash builtin echo, unless -e is given, copies the arguments to
stdout without expanding escape sequences (BSD-like behavior).
The dash builtin echo, in contrast, adopts System V behavior, which
does expand escape sequences without any option given.
Even non-builtin /bin/echo behaves differently depending on the system.
Due to these variations, echo is considered as a non-portable command.
Using printf is the common solution to avoid the portability issue.
[1] https://pubs.opengroup.org/onlinepubs/009695399/utilities/echo.html
Fixes: 858805b336be ("kbuild: add $(BASH) to run scripts with bash-extension")
Reported-by: XXing Wei <xxing.wei@unisoc.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Diffstat (limited to 'scripts')
| -rwxr-xr-x | scripts/mkcompile_h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/scripts/mkcompile_h b/scripts/mkcompile_h index 3097fec1756a..3a5a4b210c86 100755 --- a/scripts/mkcompile_h +++ b/scripts/mkcompile_h @@ -69,7 +69,7 @@ UTS_VERSION="$(echo $UTS_VERSION $CONFIG_FLAGS $TIMESTAMP | cut -b -$UTS_LEN)" echo \#define UTS_VERSION \"$UTS_VERSION\" - echo \#define LINUX_COMPILE_BY \"$LINUX_COMPILE_BY\" + printf '#define LINUX_COMPILE_BY "%s"\n' "$LINUX_COMPILE_BY" echo \#define LINUX_COMPILE_HOST \"$LINUX_COMPILE_HOST\" echo \#define LINUX_COMPILER \"`$CC -v 2>&1 | grep ' version ' | sed 's/[[:space:]]*$//'`\" |