Build Newlib

https://sourceware.org/newlib/

1.Download source code (2 ways)

　　1.git clone

　　2.ftp(Recommended)

　　　　ftp://sourceware.org/pub/newlib/index.html

　　　　version : android-7.0/prebuilts/gcc/linux-x86/arm/gcc-none-eabi-4.8q3/arm_none_eabi/include/newlib.h

　　　　eg: newlib-2.1.0.tar.gz;

2.build

       1.untar

　　1 $tar –xf  newlib-2.1.0.tar.gz 　　2 $cd newlib-2.1.0/

　　2.create newlib-2.1.0/build to build

          create newlib-2.1.0/out to install

　　1 $mkdir build 　　2 $mkdir out
　　3 $cd build/

       3.generate Makefile

　　1 $../configure      --prefix=/home/user_name/xxx/…/newlib-2.1.0/out --target=arm-none-eabi 

 

　　4.compile(errors need to be fixed)

　　1 $make

 

　　5.copy libc.a to out/    

　　1 $make install

 

[compile errors]

（紅色字體爲添加，中劃線爲刪除）

1.set PATH (use android bins: arm-none-eabi-gcc…)

~/.bashrc

PATH=${PATH}:…/android/prebuilts/gcc/linux-x86/arm/gcc-arm-none-eabi-4_8-2014q3/bin

CC=arm-none-eabi-gcc

LD=arm-none-eabi-ld

 

2.armv6-m need lo register

newlib-2.1.0/newlib/libc/sys/arm/trap.S

#if !(defined(__thumb2__)||(defined(__ARM_ARCH_6M__)

 

3.No rule to make target libgloss/arm/config/default.mh

newlib-2.1.0/libgloss/arm/cpu-init/Makefile.in

objtype = @objtype@

host_makefile_frag = $(srcdir)/../../config/default.mh

…

Makefile: Makefile.in ../config.status  @host_makefile_frag_path@

Makefile: Makefile.in ../config.status  ${host_makefile_frag_path}

           $(SHELL) ../config.status–file cpu-init/Makefile

 

4.disable variable size enums

after../configure …

newlib-2.1.0/build/Makefile

CFLAGS_FOR_TARGET                 = –g –02 –fno-short-enums

CXXFLAGS_FOR_TARGET            = –g –02 –fno-short-enums