Non-working Non-Default CARCH chrootmakepkg example

makepkg.conf

#!/hint/bash
#
# /etc/makepkg.conf
#

#########################################################################
# SOURCE ACQUISITION
#########################################################################
#
#-- The download utilities that makepkg should use to acquire sources
#  Format: 'protocol::agent'
#DLAGENTS=('file::/usr/bin/curl -gqC - -o %o %u'
#          'ftp::/usr/bin/curl -gqfC - --ftp-pasv --retry 3 --retry-delay 3 -o %o %u'
#          'http::/usr/bin/curl -gqb "" -fLC - --retry 3 --retry-delay 3 -o %o %u'
#          'https::/usr/bin/curl -gqb "" -fLC - --retry 3 --retry-delay 3 -o %o %u'
#          'rsync::/usr/bin/rsync --no-motd -z %u %o'
#          'scp::/usr/bin/scp -C %u %o')

DLAGENTS=('file::/usr/bin/curl -gqC - -o %o %u'
          'ftp::/usr/bin/curl -gqfC - --ftp-pasv --retry 3 --retry-delay 3 -o %o %u'
          'http::/usr/bin/axel --max-speed=50000000 -o %o %u'
          'https::/usr/bin/axel --max-speed=50000000 -o %o %u'
          'rsync::/usr/bin/rsync --no-motd -z %u %o'
          'scp::/usr/bin/scp -C %u %o')

# Other common tools:
# /usr/bin/snarf
# /usr/bin/lftpget -c
# /usr/bin/wget
# /usr/bin/axel
# /usr/bin/ruget

#-- The package required by makepkg to download VCS sources
#  Format: 'protocol::package'
VCSCLIENTS=('bzr::bzr'
            'fossil::fossil'
            'git::git'
            'hg::mercurial'
            'svn::subversion')

#########################################################################
# ARCHITECTURE, COMPILE FLAGS
#########################################################################
#
CARCH="znver2"
CHOST="x86_86-pc-linux-gnu"

#-- Compiler and Linker Flags
export CC=clang
export CXX=clang++
export LD="/usr/bin/ld.lld"
export AR="/usr/bin/llvm-ar"
export NM="/usr/bin/llvm-nm"
export AS="/usr/bin/llvm-as"
export RANLIB="/usr/bin/llvm-ranlib"
export STRIP="/usr/bin/llvm-strip"
export OBJCOPY="/usr/bin/llvm-objcopy"

export OBJC=clang


#CPPFLAGS=""
export CFLAGS="-march=znver2 -mtune=znver2 -O3 -pipe -fno-plt -minline-all-stringops -fexceptions -Wall \
        -Wp,-D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security \
        -fstack-clash-protection -fcf-protection"
export CXXFLAGS="${CFLAGS} -Wp,-D_GLIBCXX_ASSERTIONS"
export LDFLAGS="-Wl,-O3,--sort-common,--as-needed,-z,relro,-z,now"
export LTOFLAGS="-flto=auto"
export RUSTFLAGS="-C opt-level=3 -C target-cpu=native"

## qmake flag overrides; doesn't work with clang well for some reason - mainly due to a linker error for shared libraries
#export QMAKESPEC="linux-${CC}"
#export QMAKE_CC=${CC}
#export QMAKE_CXX=${CXX}
#export QMAKE_CC_RELEASE=${CC}
#export QMAKE_CXXFLAGS_RELEASE=${CXX}
#export QMAKE_CFLAGS=${CFLAGS}
#export QMAKE_CFLAGS_RELEASE=${CFLAGS}
#export QMAKE_CXXFLAGS=${CXXFLAGS}
#export QMAKE_CXXFLAGS_RELEASE=${CXXFLAGS}
#export QMAKE_AR_CMD=${AR}
#export QMAKE_LFLAGS=${LDFLAGS}
#export QMAKE_LFLAGS_RELEASE=${LD}
#export QMAKE_LFLAGS_RELEASE=${LDFLAGS}

#-- Make Flags: change this for DistCC/SMP systems
export MAKEFLAGS="-j$(($(nproc)+1))"
#-- Debugging flags
## The "-fvar-tracking-assignments" flag is for GCC
export DEBUG_CFLAGS="-g"
export DEBUG_CXXFLAGS="${DEBUG_CFLAGS}"
export DEBUG_RUSTFLAGS="-C debuginfo=2"

#export QMAKE_CXXFLAGS_DEBUG=${DEBUG_CXXFLAGS}

## Prevents packages (such as cuda) from interjecting their own packaged compiler(s) (for whatever reason[s] they do so) into our process, which should not use theirs
## Credit goes to https://stackoverflow.com/a/370192
export PATH=$(echo ${PATH} | awk -v RS=: -v ORS=: '/cuda/ {next} {print}' | sed 's/:*$//')

#########################################################################
# BUILD ENVIRONMENT
#########################################################################
#
# Makepkg defaults: BUILDENV=(!distcc !color !ccache check !sign)
#  A negated environment option will do the opposite of the comments below.
#
#-- distcc:   Use the Distributed C/C++/ObjC compiler
#-- color:    Colorize output messages
#-- ccache:   Use ccache to cache compilation
#-- check:    Run the check() function if present in the PKGBUILD
#-- sign:     Generate PGP signature file
#
BUILDENV=(!distcc color !ccache check !sign)
#
#-- If using DistCC, your MAKEFLAGS will also need modification. In addition,
#-- specify a space-delimited list of hosts running in the DistCC cluster.
#DISTCC_HOSTS=""
#
#-- Specify a directory for package building.
#BUILDDIR=/tmp/makepkg

#########################################################################
# GLOBAL PACKAGE OPTIONS
#   These are default values for the options=() settings
#########################################################################
#
# Makepkg defaults: OPTIONS=(!strip docs libtool staticlibs emptydirs !zipman !purge !debug !lto)
#  A negated option will do the opposite of the comments below.
#
#-- strip:      Strip symbols from binaries/libraries
#-- docs:       Save doc directories specified by DOC_DIRS
#-- libtool:    Leave libtool (.la) files in packages
#-- staticlibs: Leave static library (.a) files in packages
#-- emptydirs:  Leave empty directories in packages
#-- zipman:     Compress manual (man and info) pages in MAN_DIRS with gzip
#-- purge:      Remove files specified by PURGE_TARGETS
#-- debug:      Add debugging flags as specified in DEBUG_* variables
#-- lto:        Add compile flags for building with link time optimization
#
OPTIONS=(strip docs !libtool !staticlibs emptydirs zipman purge !debug lto)

#-- File integrity checks to use. Valid: md5, sha1, sha224, sha256, sha384, sha512, b2
INTEGRITY_CHECK=(sha256)
#-- Options to be used when stripping binaries. See `man strip' for details.
STRIP_BINARIES="--strip-all"
#-- Options to be used when stripping shared libraries. See `man strip' for details.
STRIP_SHARED="--strip-unneeded"
#-- Options to be used when stripping static libraries. See `man strip' for details.
STRIP_STATIC="--strip-debug"
#-- Manual (man and info) directories to compress (if zipman is specified)
MAN_DIRS=({usr{,/local}{,/share},opt/*}/{man,info})
#-- Doc directories to remove (if !docs is specified)
DOC_DIRS=(usr/{,local/}{,share/}{doc,gtk-doc} opt/*/{doc,gtk-doc})
#-- Files to be removed from all packages (if purge is specified)
PURGE_TARGETS=(usr/{,share}/info/dir .packlist *.pod)
#-- Directory to store source code in for debug packages
DBGSRCDIR="/usr/src/debug"

#########################################################################
# PACKAGE OUTPUT
#########################################################################
#
# Default: put built package and cached source in build directory
#
#-- Destination: specify a fixed directory where all packages will be placed
#PKGDEST=/home/packages
#-- Source cache: specify a fixed directory where source files will be cached
#SRCDEST=/home/sources
#-- Source packages: specify a fixed directory where all src packages will be placed
#SRCPKGDEST=/home/srcpackages
#-- Log files: specify a fixed directory where all log files will be placed
#LOGDEST=/home/makepkglogs
#-- Packager: name/email of the person or organization building packages
#PACKAGER="John Doe <john@doe.com>"
#-- Specify a key to use for package signing
#GPGKEY=""

#########################################################################
# COMPRESSION DEFAULTS
#########################################################################
#
COMPRESSGZ=(gzip -c -f -n)
COMPRESSBZ2=(bzip2 -c -f)
COMPRESSXZ=(xz -c -z --threads=0 -)
COMPRESSZST=(zstd -c -z -q --threads=0 -)
COMPRESSLRZ=(lrzip -q)
COMPRESSLZO=(lzop -q)
COMPRESSZ=(compress -c -f)
COMPRESSLZ4=(lz4 -q)
COMPRESSLZ=(lzip -c -f)

#########################################################################
# EXTENSION DEFAULTS
#########################################################################
#
PKGEXT='.pkg.tar.zst'
SRCEXT='.src.tar.gz'

#########################################################################
# OTHER
#########################################################################
#
#-- Command used to run pacman as root, instead of trying sudo and su
#PACMAN_AUTH=(doas)