Unrecognized options while configuring newlib

I'm trying to build newlib with the ARM option "mno-unaligned-access. I downloaded and built the GNU ARM toolchain from the gcc-arm-none-eabi-10.3-2021.10-src.tar.bz2 package on ARM's website. Then I navigated to the newlib directory and attempted to rebuild newlib with "mno-unaligned-access" but I'm getting an unrecognized error when configuring:



$ ../newlib/configure --mno-unaligned-access --enable-newlib-io-
long-long --enable-newlib-io-c99-formats --enable-newlib-reent-check-verify --enable-newlib-register-fini --enable-newlib-retargetable-locking --disable-newlib-supplied-syscalls --disable-nls --target=arm-none-eabi --prefix=/usr/local/test/newlib
configure: error: unrecognized option: --mno-unaligned-access' Try ../newlib/configure --help' for more information.



Looking at the config.log file, I believe the issue is that the target is set to "x86_64-linux-gnu" in the configure script even though the target passed is "arm-none-eabi". "mno-unaligned-access" is not an option for "x86_64-linux-gnu".



configure:2297: checking build system type
configure:2311: result: x86_64-pc-linux-gnu
configure:2358: checking host system type
configure:2371: result: x86_64-pc-linux-gnu
configure:2391: checking target system type
configure:2404: result: arm-none-eabi
configure:2458: checking for a BSD-compatible install
configure:2526: result: /usr/bin/install -c
configure:2537: checking whether ln works
configure:2559: result: yes
configure:2563: checking whether ln -s works
configure:2567: result: yes
configure:2574: checking for a sed that does not truncate output
configure:2638: result: /bin/sed
configure:2647: checking for gawk
configure:2663: found /usr/bin/gawk
configure:2674: result: gawk
configure:4117: checking for gcc
configure:4133: found /usr/bin/gcc
configure:4144: result: gcc
configure:4373: checking for C compiler version
configure:4382: gcc --version >&5
gcc (Ubuntu 5.4.0-6ubuntu1~16.04.12) 5.4.0 20160609
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.


configure:4393: $? = 0
configure:4382: gcc -v >&5
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/5/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 5.4.0-6ubuntu1~16.04.12' --with-bugurl=file:///usr/share/doc/gcc-5/README.Bugs --enable-languages=c,ada,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-5 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-5-amd64/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-5-amd64 --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-5-amd64 --with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu




Thread model: posix
gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.12)
configure:4393: $? = 0
configure:4382: gcc -V >&5
gcc: error: unrecognized command line option '-V'
gcc: fatal error: no input files
compilation terminated.
configure:4393: $? = 1
configure:4382: gcc -qversion >&5
gcc: error: unrecognized command line option '-qversion'
gcc: fatal error: no input files
compilation terminated.
configure:4393: $? = 1
configure:4413: checking for C compiler default output file name
configure:4435: gcc -g -O2 -mno-unaligned-access conftest.c >&5
gcc: error: unrecognized command line option '-mno-unaligned-access'
configure:4439: $? = 1



Is there anything I could do to rebuild newlib with the ARM option specified? Do I new to rebuild the GCC toolchain with "arm-none-eabi" specified as the target?