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The arm-none-eabi nano toolchain had same libstdc++ as the non-nano variant. The libstdc++ should be compiled with -fno-exceptions to make a nano toolchain. Additionally, since the "_nano.a" variants were not present, it was impossible to compile C++ programs with libstdc++ using --specs=nano.specs, since libstdc++_nano.a was not found. The `--with-target-subdir="."` flag is a preparation for gcc-12 introduction since the libstdc++ doesn't build without that, failing on GCC_NO_EXECUTABLES error in configure stage. I have not been able to find out another workaround. * gnu/packages/embedded.scm (make-libstdc++-arm-none-eabi): [arguments]<#:make-flags>: Add CFLAGS and CXXFLAGS. [arguments]<#:configure-flags>: Add --with-target-subdir. * gnu/packages/embedded.scm (make-libstdc++-nano-arm-none-eabi): Add variable. Change-Id: I06a507fef07352a4ec80d84e4d97065343fc2295 Signed-off-by: Ludovic Courtès <ludo@gnu.org>