On 9/6/19 12:59 AM, Yonghong Song wrote:
>
>
> On 9/5/19 10:59 AM, Andrii Nakryiko wrote:
>> ${@:2} is BASH-specific extension, which makes link-vmlinux.sh rely on
>> BASH. Use shift and ${@} instead to fix this issue.
>>
>> Reported-by: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
>> Fixes: 341dfcf8d78e ("btf: expose BTF info through sysfs")
>> Cc: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
>> Cc: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
>> Signed-off-by: Andrii Nakryiko <andriin@xxxxxx>
>
> Tested with bash/sh/csh, all works.
Thanks for testing, Yonghong! In my system sh is an alias to bash, so it
still behaved like bash and didn't fail even with existing code. I
didn't have an opportunity to install csh at that time and try it, so
thanks a lot for confirming. I basically relied on documentation to
verify shift and $@ is not BASH'ism.
> Acked-by: Yonghong Song <yhs@xxxxxx>
>
>> ---
>> scripts/link-vmlinux.sh | 16 +++++++++++-----
>> 1 file changed, 11 insertions(+), 5 deletions(-)
>>
>> diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
>> index 0d8f41db8cd6..8c59970a09dc 100755
>> --- a/scripts/link-vmlinux.sh
>> +++ b/scripts/link-vmlinux.sh
>> @@ -57,12 +57,16 @@ modpost_link()
>>
>> # Link of vmlinux
>> # ${1} - output file
>> -# ${@:2} - optional extra .o files
>> +# ${2}, ${3}, ... - optional extra .o files
>> vmlinux_link()
>> {
>> local lds="${objtree}/${KBUILD_LDS}"
>> + local output=${1}
>> local objects
>>
>> + # skip output file argument
>> + shift
>> +
>> if [ "${SRCARCH}" != "um" ]; then
>> objects="--whole-archive \
>> ${KBUILD_VMLINUX_OBJS} \
>> @@ -70,9 +74,10 @@ vmlinux_link()
>> --start-group \
>> ${KBUILD_VMLINUX_LIBS} \
>> --end-group \
>> - ${@:2}"
>> + ${@}"
>>
>> - ${LD} ${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux} -o ${1} \
>> + ${LD} ${KBUILD_LDFLAGS} ${LDFLAGS_vmlinux} \
>> + -o ${output} \
>> -T ${lds} ${objects}
>> else
>> objects="-Wl,--whole-archive \
>> @@ -81,9 +86,10 @@ vmlinux_link()
>> -Wl,--start-group \
>> ${KBUILD_VMLINUX_LIBS} \
>> -Wl,--end-group \
>> - ${@:2}"
>> + ${@}"
>>
>> - ${CC} ${CFLAGS_vmlinux} -o ${1} \
>> + ${CC} ${CFLAGS_vmlinux} \
>> + -o ${output} \
>> -Wl,-T,${lds} \
>> ${objects} \
>> -lutil -lrt -lpthread
>>
