[Buildroot] [Bug 11706] binman (U-boot tool) cannot find libfdt "binman: No module named _libfdt" if python3 selected

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=11706

--- Comment #2 from Thomas Petazzoni <thomas.petazzoni at free-electrons.com> ---
I can indeed reproduce the issue with the following defconfig:

BR2_arm=y
BR2_TOOLCHAIN_EXTERNAL=y
BR2_TOOLCHAIN_EXTERNAL_CUSTOM=y
BR2_TOOLCHAIN_EXTERNAL_DOWNLOAD=y
BR2_TOOLCHAIN_EXTERNAL_URL="http://autobuild.buildroot.org/toolchains/tarballs/br-arm-full-2019.05.1.tar.bz2"
BR2_TOOLCHAIN_EXTERNAL_GCC_4_9=y
BR2_TOOLCHAIN_EXTERNAL_HEADERS_4_14=y
BR2_TOOLCHAIN_EXTERNAL_LOCALE=y
# BR2_TOOLCHAIN_EXTERNAL_HAS_THREADS_DEBUG is not set
BR2_TOOLCHAIN_EXTERNAL_CXX=y
BR2_INIT_NONE=y
BR2_SYSTEM_BIN_SH_NONE=y
# BR2_PACKAGE_BUSYBOX is not set
BR2_PACKAGE_LIBVIPS=y
# BR2_TARGET_ROOTFS_TAR is not set

The problem is that binman has the following shebang:

#!/usr/bin/env python2

When python3 is selected for the target, we build host-python3, and we install
all host-Python modules for host-python3. So when binman uses python2, it uses
the system-provided python2, which does not have those additional Python
modules installed.

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