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Adding Nautilus as a newlib target

Prerequisites

  • Install autoconf (I used 2.69, newest on Ubuntu Focal)
  • Install automake1.11 (this is not the default anymore, but newer versions are broken for newlib, you'll get automake errors)

How it came together

  1. Added nautilus* entry to config.sub in top-level dir
  2. Modified newlib/configure.host as per docs to add a nautilus target and create a new sys_dir path. Note that I had to add -D_FORTIFY_SOURCE=0 to the newlib_cflags var here since -O2 will automatically set this to 2 on newer versions of gcc, thus breaking the newlib build.
  3. Modified newlib/libc/sys/configure.in as per the docs to add a subdir entry, then ran autoconf
  4. Created newlib/libc/sys/nautilus dir
  5. Added stub implementations for syscalls (*.c) in that dir based on sys/rdos and sys/linux which will link against Nautilus sys_* syscall (not really syscall) stubs.
  6. Created a configure.in and Makefile.am in sys/nautilus based on linux/rdos entries.
  7. Ran aclocal, autoconf, and automake as per docs. Encountered issues here because of newer automake version. Worked after forced downgrade to automake 1.11.
  8. Set up a fake cross-compiler toolchain with symlinks to please newlib build toolchain (see below).
  9. Configured and built newlib as below, then copied over the install files to Nautilus to link directly.

Configure

First I set up a dummy cross toolchain for binutils on the first run:

$ for i in ar as cc g++ gcc ld nm objcopy objdump ranlib readelf strip; do ln -s /usr/bin/$i /usr/bin/x86_64--nautilus-$i; done;

If you've already got a cross-compiler built, just make sure the binaries (in my case in /opt/nautilus/cross/bin/) are on your PATH.

Then you can configure, from the top-level newlib dir:

$ mkdir bld-nautilus
$ cd bld-nautilus
$ ../configure --target=x86_64-nautilus --with-newlib --disable-multilib --prefix=/usr

Build

$ make all-target-newlib -j
$ make -j
$ make DESTDIR=$SYSROOT install

Where SYSROOT for me is /opt/nautilus/sysroot. This was also passed to the gcc/binutils build.

newlib does not install in quite the right place. You have to move things over to sysroot/usr/{include,lib} rather than sysroot/usr/TARGET/{include,lib}. See naut-scripts/fixup.sh

Note that Nautilus must point directly to these libraries and the cross-compiler toolchain binaries.

References

These StackOverflow questions were helpful in finding out what was going on with automake