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Name: arm-none-eabi-newlib
Version: 4.3.0
Release: alt1

Summary: C library intended for use on embedded systems
License: BSD and MIT and LGPLv2+ and ISC
Group: Development/Tools
Url: https://sourceware.org/newlib/

Source:  %name-%version-%release.tar

BuildArch: noarch
BuildRequires: arm-none-eabi-binutils arm-none-eabi-gcc
BuildRequires: makeinfo

%description
Newlib is a C library intended for use on embedded systems. It is a
conglomeration of several library parts, all under free software licenses
that make them easily usable on embedded products.

%define target arm-none-eabi
%define _libexecdir /usr/libexec

%prep
%setup

%build
mkdir obj; pushd obj
export CFLAGS="-g -O2 -ffunction-sections -fdata-sections"
../configure \
   --prefix=%_libexecdir \
   --libdir=%_libexecdir \
   --mandir=%_mandir \
   --target=%target \
   --disable-nls \
   --disable-newlib-supplied-syscalls \
   --enable-newlib-io-long-long \
   --enable-newlib-io-c99-formats \
   --enable-newlib-mb \
   --enable-newlib-reent-check-verify \
   --enable-newlib-register-fini \
   --enable-newlib-retargetable-locking

%make_build
popd

mkdir nano; pushd nano
export CFLAGS="-g -Os -ffunction-sections -fdata-sections"
../configure \
   --prefix=%_libexecdir \
   --libdir=%_libexecdir \
   --mandir=%_mandir \
   --target=%target \
   --disable-nls \
   --disable-newlib-fseek-optimization \
   --disable-newlib-fvwrite-in-streamio \
   --disable-newlib-unbuf-stream-opt \
   --disable-newlib-wide-orient \
   --disable-newlib-supplied-syscalls \
   --enable-lite-exit \
   --enable-newlib-global-atexit \
   --enable-newlib-nano-formatted-io \
   --enable-newlib-nano-malloc \
   --enable-newlib-reent-check-verify \
   --enable-newlib-reent-small \
   --enable-newlib-retargetable-locking

%make_build
popd

%install
%makeinstall_std -C obj

NANO_ROOT=%buildroot/nano
make install DESTDIR=$NANO_ROOT -C nano
for i in $(find $NANO_ROOT -regex ".*/lib\(c\|g\|rdimon\)\.a"); do
   file=$(basename $i | sed "s|\.a|_nano\.a|")
   target_path=$(dirname $i | sed "s|$NANO_ROOT||")
   mv $i "%buildroot$target_path/$file"
done
rm -rf $NANO_ROOT

# we don't want these as we are a cross version
rm -rf %buildroot%_infodir

%add_verify_elf_skiplist %_libexecdir/%target/lib/*
%brp_strip_none %_libexecdir/%target/lib/*

%files
%doc COPYING*
%dir %_libexecdir/%target
%dir %_libexecdir/%target/include/
%_libexecdir/%target/include/*
%dir %_libexecdir/%target/lib
%_libexecdir/%target/lib/*

%changelog
…
Full changelog you can see here