[BUG] sandbox_defconfig fails to build with origin/master dadc1e38306b1c3

[Heinrich Schuchardt]

Hello Tom, hello Simon,

make sandbox_defconfig
make V=1

yields:

make -f ./scripts/Makefile.build obj=test/log
  gcc -Wp,-MD,test/log/.syslog_test.o.d -nostdinc -isystem
/usr/lib/gcc/x86_64-linux-gnu/10/include -Iinclude
-I./arch/sandbox/include -include ./include/linux/kconfig.h -D__KERNEL__
-D__UBOOT__ -Wall -Wstrict-prototypes -Wno-format-security -fno-builtin
-ffreestanding -std=gnu11 -fshort-wchar -fno-strict-aliasing -fno-PIE
-Os -fno-stack-protector -fno-delete-null-pointer-checks
-Wno-stringop-truncation -Wno-maybe-uninitialized -fmacro-prefix-map=./=
-g -fstack-usage -Wno-format-nonliteral -Wno-address-of-packed-member
-Wno-unused-but-set-variable -Werror=date-time -Werror -D__SANDBOX__
-U_FORTIFY_SOURCE -DCONFIG_ARCH_MAP_SYSMEM -fPIC -I/usr/include/SDL2
-D_REENTRANT -pipe    -DKBUILD_BASENAME='"syslog_test"'
-DKBUILD_MODNAME='"syslog_test"' -c -o test/log/syslog_test.o
test/log/syslog_test.c
test/log/syslog_test.c:21:10: fatal error: syslog_test.h: No such file
or directory
   21 | #include <syslog_test.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.

git bisect:

52d3df7fefe30b05677db9055e68c666a071d89a is the first bad commit
commit 52d3df7fefe30b05677db9055e68c666a071d89a
Author: Simon Glass <sjg at chromium.org>
Date:   Sat Sep 12 11:13:34 2020 -0600

    log: Allow LOG_DEBUG to always enable log output

@Tom:
Why are such build failures not detected before merging?

Best regards

Heinrich