The file system shell example failed to build

[jasonedn]

Describe the bug
Failed to build the file system shell example on native_posix,

To Reproduce
Steps to reproduce the behavior:

1. export PKG_CONFIG_PATH=/usr/lib/i386-linux-gnu/pkgconfig
2. west build -b native_posix samples/subsys/shell/fs

Expected behavior
Pass the building

Impact

Screenshots or console output
...
ephyr && cmake -E rename zephyr_prebuilt.map zephyr.map && /usr/bin/objdump -S zephyr.elf > zephyr.lst && /usr/bin/readelf -e zephyr.elf > zephyr.stat && /usr/bin/cmake -E copy zephyr.elf zephyr.exe
/usr/bin/ld: skipping incompatible //usr/lib/x86_64-linux-gnu/libfuse.so when searching for -lfuse
/usr/bin/ld: skipping incompatible //usr/lib/x86_64-linux-gnu/libfuse.a when searching for -lfuse
/usr/bin/ld: cannot find -lfuse
collect2: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.
FATAL ERROR: command exited with status 1: /usr/bin/cmake --build
...

Environment (please complete the following information):

• OS: 64-bit Ubuntu 18.04
• Toolchain: Zephyr SDK
• Commit SHA : 2b29d3

Additional context
This issue is related to libfuse. The libfuse-dev was installed from https://ubuntu.pkgs.org/18.04/ubuntu-main-i386/libfuse-dev_2.9.7-1ubuntu1_i386.deb.html.
However the folder "/usr/lib/i386-linux-gnu/pkgconfig" couldn't be found anywhere.

[pabigot]

Seems likely the README is out of date.

If you do:

west build -b native_posix_64 samples/subsys/shell/fs/

does it work?

[jasonedn]

Seems likely the README is out of date.

If you do:

west build -b native_posix_64 samples/subsys/shell/fs/

does it work?

No, it doesn't work. According to the online document, it seems that native-posix supports 32-bit only:
"Before starting a build, make sure that the i386 pkgconfig directory is in your search path and that a 32-bit version of libfuse is installed. For more background information on this requirement see Native POSIX execution (native_posix)."

I spent hours to try to install 32-bit libfuse library, but it failed. Later I found 64-bit support could be configured in menuconfig as below:

[pabigot]

Yes, native_posix is 32-bit, but native_posix_64 is 64-bit. Which should have worked immediately, assuming you had 64-bit fuse available.

[overheat]

@pabigot I have tried this:

sudo apt install libfuse-dev
mkdir flash
west build -b native_posix_64 samples/subsys/shell/fs/
west build -t run

I did't export PKG_CONFIG_PATH in this case.
I can see this,

Mounting flash at flash/
UART_0 connected to pseudotty: /dev/pts/2
*** Booting Zephyr OS build zephyr-v2.2.0-1666-gf3b4d8a86f78  ***

but after screen /dev/pts/2, no shell, nothing display on the screen, just stuck there.

[pabigot]

@overheat I can confirm that behavior, but have no idea what the problem is. Please open a question issue.

[overheat]

Sure. Thanks! Best regards, Aaron