Makefile: fix generation of defaultenv.h from empty initial file

When CONFIG_USE_DEFAULT_ENV_FILE=y and the file
CONFIG_DEFAULT_ENV_FILE is empty (or at least doesn't contain any
non-comment, non-empty lines), we end up feeding nothing into xxd,
which in turn then outputs nothing. Then blindly appending ", 0x00"
means that we end up trying to compile (roughly)

const char defaultenv[] = { , 0x00 }

which is of course broken.

To fix that, change the frobbing of the text file so that we always
end up printing an extra empty line (which gets turned into that extra
nul byte we need) - that corresponds better to the binary format
consisting of a series of key=val nul terminated strings, terminated
by an empty string.

Reported-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Reviewed-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
This commit is contained in:
Rasmus Villemoes 2021-04-22 09:44:18 +02:00 committed by Stefan Roese
parent 6b4880e63f
commit c6ecb2f81e

View File

@ -1854,11 +1854,10 @@ define filechk_timestamp.h
endef
define filechk_defaultenv.h
(grep -v '^#' | \
grep -v '^$$' | \
( { grep -v '^#' | grep -v '^$$' || true ; echo '' ; } | \
tr '\n' '\0' | \
sed -e 's/\\\x0\s*//g' | \
xxd -i ; echo ", 0x00" ; )
xxd -i ; )
endef
define filechk_dt.h