How to rebuild newlib and newlib-nano of GNU Arm Embedded Toolchain

Question

I downloaded the toolchain “gcc-arm-none-eabi-6-2017-q2-update-win32-sha1.exe” (Windows) from https://developer.arm.com/open-source/gnu-toolchain/gnu-rm/downloads and installed it on my Windows 10 PC.

The installation folder contains a release.txt in “../share/doc/gcc-arm-none-eabi/” which tells:

This release includes the following items:

• newlib and newlib-nano : git://sourceware.org/git/newlib-cygwin.git commit 0d79b021a4ec4e6b9aa1a9f6db0e29a137005ce7

And also the readme.txt in “../share/doc/gcc-arm-none-eabi/” contains:

• C Libraries usage *

This toolchain is released with two prebuilt C libraries based on newlib: one is the standard newlib (libc.a) and the other is newlib-nano (libc_nano.a) for code size.

Now I want exactly rebuild all the libc.a and libc_nano.a contained in “../arm-none-eabi/lib/thumb”

At the moment I can build on Ubuntu with “gcc-arm-none-eabi-6-2017-q2-update-linux.tar.bz2”

$ # Downloaded newlib-cygwin (with corresponding hash) into folder newlib-cygwin
$ mkdir build
$ cd build
$ ../newlib-cygwin/configure --target=arm-none-eabi --disable-newlib-supplied-syscalls
$ make

How do I have to configure the newlib to build the exact copies of libc.a and for libc_nano.a contained in gcc-arm-none-eabi-6-2017-q2-update-linux.tar.bz2?

$ # Downloaded newlib-cygwin (with corresponding hash) into folder newlib-cygwin
$ mkdir build
$ cd build
$ ../newlib-cygwin/configure --target=arm-none-eabi --???
$ make

Answer 1

If i understand you correctly, a more detailed question is:
What configure options did 'GNU Arm Embedded Toolchain' developers used when building newlib libraries shipped in gcc-arm-none-eabi-6-2017-q2-update-linux.tar.bz2 archive?
These ones for newlib:

--target=arm-none-eabi --enable-newlib-io-long-long --enable-newlib-register-fini --enable-newlib-retargetable-locking --disable-newlib-supplied-syscalls --disable-nls

And these ones for newlib-nano:

--target=arm-none-eabi --enable-newlib-reent-small --disable-newlib-fvwrite-in-streamio --disable-newlib-fseek-optimization --disable-newlib-wide-orient --enable-newlib-nano-malloc --disable-newlib-unbuf-stream-opt --enable-lite-exit --enable-newlib-global-atexit --enable-newlib-nano-formatted-io --disable-nls

How I got it? Let's walk through the process:
These packages are build on launchpad, where from you find all the builds that took place on lanuchpad. I picked gcc-arm-none-eabi 6-2017q2-1 from 2017-10-24. There i can find the buildlog. I grepped the buildlog with | grep "^+ " | grep "configure " | grep 'src/newlib' and i was left with:

+ /<<PKGBUILDDIR>>/src/newlib/configure --target=arm-none-eabi --prefix=/<<PKGBUILDDIR>>/install-native --infodir=/<<PKGBUILDDIR>>/install-native/share/doc/gcc-arm-none-eabi/info --mandir=/<<PKGBUILDDIR>>/install-native/share/doc/gcc-arm-none-eabi/man --htmldir=/<<PKGBUILDDIR>>/install-native/share/doc/gcc-arm-none-eabi/html --pdfdir=/<<PKGBUILDDIR>>/install-native/share/doc/gcc-arm-none-eabi/pdf --enable-newlib-io-long-long --enable-newlib-register-fini --enable-newlib-retargetable-locking --disable-newlib-supplied-syscalls --disable-nls + /<<PKGBUILDDIR>>/src/newlib/configure --target=arm-none-eabi --prefix=/<<PKGBUILDDIR>>/build-native/target-libs --disable-newlib-supplied-syscalls --enable-newlib-reent-small --disable-newlib-fvwrite-in-streamio --disable-newlib-fseek-optimization --disable-newlib-wide-orient --enable-newlib-nano-malloc --disable-newlib-unbuf-stream-opt --enable-lite-exit --enable-newlib-global-atexit --enable-newlib-nano-formatted-io --disable-nls

A bit of Sherlock Holmes and i deduced that the second line is newlib configured to build as newlib-nano (--enable-newlib-reent-small), the first is newlib configured to build as full newlib.
To answer your topic question, to recompile newlib and newlib-nano the same way pass the options I have posted above to newlib ./configure script.