cmake error

[15658150157]

Describe the bug
I newly install ubuntu 18.04 on my pc, and follow the start guide, below is the error i meet.

cmake -DBOARD=qemu_x86 ..
Zephyr version: 1.14.0
-- Found PythonInterp: /usr/bin/python3 (found suitable version "3.6.7", minimum required is "3.4")
-- Selected BOARD qemu_x86
-- Loading /home/yhx/zephyrproject/zephyr/boards/x86/qemu_x86/qemu_x86.dts as base
-- Overlaying /home/yhx/zephyrproject/zephyr/dts/common/common.dts
/home/yhx/zephyrproject/zephyr/scripts/dts/extract_dts_includes.py:370: YAMLLoadWarning: calling yaml.load() without Loader=... is deprecated, as the default Loader is unsafe. Please read https://msg.pyyaml.org/load for full details.
binding = merge_included_bindings(file, yaml.load(yf))
Traceback (most recent call last):
File "/home/yhx/zephyrproject/zephyr/scripts/dts/extract_dts_includes.py", line 520, in
main()
File "/home/yhx/zephyrproject/zephyr/scripts/dts/extract_dts_includes.py", line 503, in main
load_bindings(root, args.yaml)
File "/home/yhx/zephyrproject/zephyr/scripts/dts/extract_dts_includes.py", line 370, in load_bindings
binding = merge_included_bindings(file, yaml.load(yf))
File "/home/yhx/.local/lib/python3.6/site-packages/yaml/init.py", line 114, in load
return loader.get_single_data()
File "/home/yhx/.local/lib/python3.6/site-packages/yaml/constructor.py", line 43, in get_single_data
return self.construct_document(node)
File "/home/yhx/.local/lib/python3.6/site-packages/yaml/constructor.py", line 52, in construct_document
for dummy in generator:
File "/home/yhx/.local/lib/python3.6/site-packages/yaml/constructor.py", line 404, in construct_yaml_map
value = self.construct_mapping(node)
File "/home/yhx/.local/lib/python3.6/site-packages/yaml/constructor.py", line 210, in construct_mapping
return super().construct_mapping(node, deep=deep)
File "/home/yhx/.local/lib/python3.6/site-packages/yaml/constructor.py", line 135, in construct_mapping
value = self.construct_object(value_node, deep=deep)
File "/home/yhx/.local/lib/python3.6/site-packages/yaml/constructor.py", line 92, in construct_object
data = constructor(self, node)
File "/home/yhx/.local/lib/python3.6/site-packages/yaml/constructor.py", line 420, in construct_undefined
node.start_mark)
yaml.constructor.ConstructorError: could not determine a constructor for the tag '!include'
in "/home/yhx/zephyrproject/zephyr/dts/bindings/serial/ns16550.yaml", line 9, column 5
CMake Error at /home/yhx/zephyrproject/zephyr/cmake/dts.cmake:145 (message):
command failed with return code: 1
Call Stack (most recent call first):
/home/yhx/zephyrproject/zephyr/cmake/app/boilerplate.cmake:396 (include)
CMakeLists.txt:4 (include)

-- Configuring incomplete, errors occurred!

below is env:
env | grep ZE

ZEPHYR_TOOLCHAIN_VARIANT=zephyr
ZEPHYR_BASE=/home/yhx/zephyrproject/zephyr
ZEPHYR_SDK_INSTALL_DIR=/home/yhx/zephyr

To Reproduce
Steps to reproduce the behavior:

1. mkdir build; cd build
2. cmake -DBOARD=qemu_x86 ..
3. make
4. See error

Expected behavior
A clear and concise description of what you expected to happen.

Impact
What impact does this issue have on your progress (e.g., annoyance, showstopper)

[aescolar]

@ulfalizer : Could you take a look?

[carlescufi]

@15658150157 this is a known issue that was fixed already here: #14497. Please take the latest master

[ulfalizer]

@15658150157
I think this is fixed by commit 4278bf5 ("scripts/dts: Fix for PyYAML 5.1 Loader changes"), which you don't seem to have.

If you don't want to use the latest master, this workaround might work (which downgrades pyyaml):

$ pip install --user pyyaml==3.13

CC @mike-scott

[15658150157]

ok. solve it. very thanks.