./samples/microbit/central_eatt builds failed at v2.5.0 release

[kaiser-ren]

Describe the bug
I'm trying to use ./samples/microbit/central_eatt sample code for eatt, but when I tried to build this project, there is a fatal error.

To Reproduce
Steps to reproduce the behavior:

1. west build -p auto -b bbc_microbit ./

Expected behavior
Build successfully.

Impact
I can't use this sample.

Logs and console output
-- west build: making build dir /Users/renkai/zephyrproject/zephyr/samples/microbit/central_eatt/build pristine
-- west build: generating a build system
Including boilerplate (Zephyr base): /Users/renkai/zephyrproject/zephyr/cmake/app/boilerplate.cmake
-- Application: /Users/renkai/zephyrproject/zephyr/samples/microbit/central_eatt
-- Zephyr version: 2.5.0 (/Users/renkai/zephyrproject/zephyr)
-- Found Python3: /usr/local/bin/python3.9 (found suitable exact version "3.9.1") found components: Interpreter
-- Found west (found suitable version "0.9.0", minimum required is "0.7.1")
-- Board: bbc_microbit
-- Cache files will be written to: /Users/renkai/Library/Caches/zephyr
-- Found dtc: /usr/local/bin/dtc (found suitable version "1.6.0", minimum required is "1.4.6")
-- Found toolchain: gnuarmemb (/Users/renkai/gcc-arm-none-eabi-9-2019-q4-major)
-- Found BOARD.dts: /Users/renkai/zephyrproject/zephyr/boards/arm/bbc_microbit/bbc_microbit.dts
-- Generated zephyr.dts: /Users/renkai/zephyrproject/zephyr/samples/microbit/central_eatt/build/zephyr/zephyr.dts
-- Generated devicetree_unfixed.h: /Users/renkai/zephyrproject/zephyr/samples/microbit/central_eatt/build/zephyr/include/generated/devicetree_unfixed.h
-- Generated device_extern.h: /Users/renkai/zephyrproject/zephyr/samples/microbit/central_eatt/build/zephyr/include/generated/device_extern.h

warning: BT_EATT (defined at subsys/bluetooth/host/Kconfig.gatt:27) was assigned the value 'y' but
got the value 'n'. Check these unsatisfied dependencies: BT_L2CAP_ECRED (=n). See
http://docs.zephyrproject.org/latest/reference/kconfig/CONFIG_BT_EATT.html and/or look up BT_EATT in
the menuconfig/guiconfig interface. The Application Development Primer, Setting Configuration
Values, and Kconfig - Tips and Best Practices sections of the manual might be helpful too.

Parsing /Users/renkai/zephyrproject/zephyr/Kconfig
Loaded configuration '/Users/renkai/zephyrproject/zephyr/boards/arm/bbc_microbit/bbc_microbit_defconfig'
Merged configuration '/Users/renkai/zephyrproject/zephyr/samples/microbit/central_eatt/prj.conf'
Configuration saved to '/Users/renkai/zephyrproject/zephyr/samples/microbit/central_eatt/build/zephyr/.config'
Kconfig header saved to '/Users/renkai/zephyrproject/zephyr/samples/microbit/central_eatt/build/zephyr/include/generated/autoconf.h'
-- The C compiler identification is GNU 9.2.1
-- The CXX compiler identification is GNU 9.2.1
-- The ASM compiler identification is GNU
-- Found assembler: /Users/renkai/gcc-arm-none-eabi-9-2019-q4-major/bin/arm-none-eabi-gcc
CMake Deprecation Warning at /Users/renkai/zephyrproject/modules/lib/civetweb/CMakeLists.txt:2 (cmake_minimum_required):
Compatibility with CMake < 2.8.12 will be removed from a future version of
CMake.

Update the VERSION argument value or use a ... suffix to tell
CMake that the project does not need compatibility with older versions.

-- Configuring done
-- Generating done
-- Build files have been written to: /Users/renkai/zephyrproject/zephyr/samples/microbit/central_eatt/build
-- west build: building application
[1/200] Preparing syscall dependency handling

[24/200] Building C object CMakeFiles/app.dir/src/main.c.obj
FAILED: CMakeFiles/app.dir/src/main.c.obj
ccache /Users/renkai/gcc-arm-none-eabi-9-2019-q4-major/bin/arm-none-eabi-gcc -DBUILD_VERSION=zephyr-v2.5.0 -DKERNEL -DNRF51 -D_FORTIFY_SOURCE=2 -D__PROGRAM_START -D__ZEPHYR__=1 -I/Users/renkai/zephyrproject/zephyr/samples/bluetooth -I/Users/renkai/zephyrproject/zephyr/include -Izephyr/include/generated -I/Users/renkai/zephyrproject/zephyr/soc/arm/nordic_nrf/nrf51 -I/Users/renkai/zephyrproject/zephyr/subsys/bluetooth -I/Users/renkai/zephyrproject/modules/hal/cmsis/CMSIS/Core/Include -I/Users/renkai/zephyrproject/modules/hal/nordic/nrfx -I/Users/renkai/zephyrproject/modules/hal/nordic/nrfx/drivers/include -I/Users/renkai/zephyrproject/modules/hal/nordic/nrfx/mdk -I/Users/renkai/zephyrproject/zephyr/modules/hal_nordic/nrfx/. -I/Users/renkai/zephyrproject/modules/crypto/tinycrypt/lib/include -isystem /Users/renkai/zephyrproject/zephyr/lib/libc/minimal/include -isystem /Users/renkai/gcc-arm-none-eabi-9-2019-q4-major/bin/../lib/gcc/arm-none-eabi/9.2.1/include -isystem /Users/renkai/gcc-arm-none-eabi-9-2019-q4-major/bin/../lib/gcc/arm-none-eabi/9.2.1/include-fixed -Os -imacros /Users/renkai/zephyrproject/zephyr/samples/microbit/central_eatt/build/zephyr/include/generated/autoconf.h -ffreestanding -fno-common -g -mcpu=cortex-m0 -mthumb -mabi=aapcs -imacros /Users/renkai/zephyrproject/zephyr/include/toolchain/zephyr_stdint.h -Wall -Wformat -Wformat-security -Wno-format-zero-length -Wno-main -Wno-pointer-sign -Wpointer-arith -Wno-address-of-packed-member -Wno-unused-but-set-variable -Werror=implicit-int -fno-asynchronous-unwind-tables -fno-pie -fno-pic -fno-strict-overflow -fno-reorder-functions -fno-defer-pop -fmacro-prefix-map=/Users/renkai/zephyrproject/zephyr/samples/microbit/central_eatt=CMAKE_SOURCE_DIR -fmacro-prefix-map=/Users/renkai/zephyrproject/zephyr=ZEPHYR_BASE -fmacro-prefix-map=/Users/renkai/zephyrproject=WEST_TOPDIR -ffunction-sections -fdata-sections -std=c99 -nostdinc -MD -MT CMakeFiles/app.dir/src/main.c.obj -MF CMakeFiles/app.dir/src/main.c.obj.d -o CMakeFiles/app.dir/src/main.c.obj -c ../src/main.c
../src/main.c:33:8: error: unknown type name 'u8_t'
33 | static u8_t notify_func(struct bt_conn *conn,
| ^~~~
../src/main.c:35:25: error: unknown type name 'u16_t'
35 | const void *data, u16_t length)
| ^~~~~
../src/main.c:48:8: error: unknown type name 'u8_t'
48 | static u8_t discover_func(struct bt_conn *conn,
| ^~~~
../src/main.c: In function 'discover_func':
../src/main.c:85:29: error: 'notify_func' undeclared (first use in this function)
85 | subscribe_params.notify = notify_func;
| ^~~~~~~~~~~
../src/main.c:85:29: note: each undeclared identifier is reported only once for each function it appears in
../src/main.c: In function 'eir_found':
../src/main.c:112:31: error: 'u16_t' undeclared (first use in this function)
112 | if (data->data_len % sizeof(u16_t) != 0U) {
| ^~~~~
../src/main.c:120:9: error: expected ';' before 'u16'
120 | u16_t u16;
| ^~~~
| ;
../src/main.c:123:12: error: 'u16' undeclared (first use in this function)
123 | memcpy(&u16, &data->data[i], sizeof(u16));
| ^~~
../src/main.c: At top level:
../src/main.c:149:52: error: unknown type name 's8_t'
149 | static void device_found(const bt_addr_le_t *addr, s8_t rssi, u8_t type,
| ^~~~
../src/main.c:149:63: error: unknown type name 'u8_t'
149 | static void device_found(const bt_addr_le_t *addr, s8_t rssi, u8_t type,
| ^~~~
../src/main.c: In function 'start_scan':
../src/main.c:178:38: error: 'device_found' undeclared (first use in this function); did you mean 'eir_found'?
178 | err = bt_le_scan_start(&scan_param, device_found);
| ^~~~~~~~~~~~
| eir_found
../src/main.c: At top level:
../src/main.c:187:45: error: unknown type name 'u8_t'
187 | static void connected(struct bt_conn *conn, u8_t conn_err)
| ^~~~
../src/main.c:227:48: error: unknown type name 'u8_t'
227 | static void disconnected(struct bt_conn *conn, u8_t reason)
| ^~~~
../src/main.c:246:15: error: 'connected' undeclared here (not in a function)
246 | .connected = connected,
| ^~~~~~~~~
../src/main.c:247:18: error: 'disconnected' undeclared here (not in a function)
247 | .disconnected = disconnected,
| ^~~~~~~~~~~~
../src/main.c:102:13: warning: 'eir_found' defined but not used [-Wunused-function]
102 | static bool eir_found(struct bt_data *data, void *user_data)
| ^~~~~~~~~
../src/main.c:48:13: warning: 'discover_func' defined but not used [-Wunused-function]
48 | static u8_t discover_func(struct bt_conn *conn,
| ^~~~~~~~~~~~~
[29/200] Building C object zephyr/CMakeFiles/zephyr.dir/lib/os/heap.c.obj
ninja: build stopped: subcommand failed.
FATAL ERROR: command exited with status 1: /usr/local/bin/cmake --build /Users/renkai/zephyrproject/zephyr/samples/microbit/central_eatt/build

Environment (please complete the following information):

• OS: macOS
• Toolchain GNU Arm
• Commit, fe7c2ef

Additional context
Add any other context about the problem here.

[kaiser-ren]

Sorry, reported by mistake, closed.