>>> wayland 1.18.0 Extracting
xzcat /tmp/instance-1/dl/wayland/wayland-1.18.0.tar.xz | /tmp/instance-1/output-1/host/bin/tar --strip-components=1 -C /tmp/instance-1/output-1/build/wayland-1.18.0   -xf -
>>> wayland 1.18.0 Patching

Applying 0001-build-add-option-to-disable-tests.patch using patch: 
patching file Makefile.am
patching file configure.ac
patching file meson.build
patching file meson_options.txt
>>> wayland 1.18.0 Configuring
rm -rf /tmp/instance-1/output-1/build/wayland-1.18.0//build
mkdir -p /tmp/instance-1/output-1/build/wayland-1.18.0//build
sed -e 's%@TARGET_CROSS@%/tmp/instance-1/output-1/host/bin/microblazeel-buildroot-linux-uclibc-%g' -e 's%@TARGET_ARCH@%microblazeel%g' -e 's%@TARGET_CPU@%%g' -e 's%@TARGET_ENDIAN@%little%g' -e 's%@TARGET_CFLAGS@%"-D_LARGEFILE_SOURCE", "-D_LARGEFILE64_SOURCE", "-D_FILE_OFFSET_BITS=64", "-Os"%g' -e 's%@TARGET_LDFLAGS@%%g' -e 's%@TARGET_CXXFLAGS@%"-D_LARGEFILE_SOURCE", "-D_LARGEFILE64_SOURCE", "-D_FILE_OFFSET_BITS=64", "-Os"%g' -e 's%@HOST_DIR@%/tmp/instance-1/output-1/host%g' -e 's%@STAGING_DIR@%/tmp/instance-1/output-1/host/microblazeel-buildroot-linux-uclibc/sysroot%g' -e 's%@STATIC@%false%g' -e "/^\[binaries\]$/s:$::" -e "/^\[properties\]$/s:$::" package/meson/cross-compilation.conf.in > /tmp/instance-1/output-1/build/wayland-1.18.0//build/cross-compilation.conf
PATH="/tmp/instance-1/output-1/host/bin:/tmp/instance-1/output-1/host/sbin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin"  PYTHONNOUSERSITE=y /tmp/instance-1/output-1/host/bin/meson --prefix=/usr --libdir=lib --default-library=shared --buildtype=release --cross-file=/tmp/instance-1/output-1/build/wayland-1.18.0//build/cross-compilation.conf -Dbuild.pkg_config_path=/tmp/instance-1/output-1/host/lib/pkgconfig -Dtests=false -Ddocumentation=false /tmp/instance-1/output-1/build/wayland-1.18.0/ /tmp/instance-1/output-1/build/wayland-1.18.0//build
WARNING: Unknown CPU family microblazeel, please report this at https://github.com/mesonbuild/meson/issues/new
The Meson build system
Version: 0.54.2
Source dir: /tmp/instance-1/output-1/build/wayland-1.18.0
Build dir: /tmp/instance-1/output-1/build/wayland-1.18.0/build
Build type: cross build
Project name: wayland
Project version: 1.18.0
C compiler for the build machine: ccache cc (gcc 9.3.0 "cc (Ubuntu 9.3.0-10ubuntu2) 9.3.0")
C linker for the build machine: cc ld.bfd 2.34
C++ compiler for the build machine: ccache c++ (gcc 9.3.0 "c++ (Ubuntu 9.3.0-10ubuntu2) 9.3.0")
C++ linker for the build machine: c++ ld.bfd 2.34
C compiler for the host machine: /tmp/instance-1/output-1/host/bin/microblazeel-buildroot-linux-uclibc-gcc (gcc 8.4.0 "microblazeel-buildroot-linux-uclibc-gcc.br_real (Buildroot 2020.08-git-00237-gedd4f4deb5) 8.4.0")
C linker for the host machine: /tmp/instance-1/output-1/host/bin/microblazeel-buildroot-linux-uclibc-gcc ld.bfd 2.32

../output-1/build/wayland-1.18.0/meson.build:1:0: ERROR: Unknown compiler(s): [['/tmp/instance-1/output-1/host/bin/microblazeel-buildroot-linux-uclibc-g++']]
The follow exceptions were encountered:
Running "/tmp/instance-1/output-1/host/bin/microblazeel-buildroot-linux-uclibc-g++ --version" gave "[Errno 2] No such file or directory: '/tmp/instance-1/output-1/host/bin/microblazeel-buildroot-linux-uclibc-g++'"

A full log can be found at /tmp/instance-1/output-1/build/wayland-1.18.0/build/meson-logs/meson-log.txt
make: *** [package/pkg-generic.mk:259: /tmp/instance-1/output-1/build/wayland-1.18.0/.stamp_configured] Error 1
make: Leaving directory '/tmp/instance-1/buildroot'