Can I compile newlib as a shared library on x86_64 linux-gnu?

Can I compile newlib as a shared library on x86_64 linux-gnu?

[Kai Yu]

In newlib README file, it says that:

Shared newlib
=============

newlib uses libtool when it is being compiled natively (with
--target=i[34567]86-pc-linux-gnu) on an i[34567]86-pc-linux-gnu
host. This allows newlib to be compiled as a shared library.

To configure newlib, do the following from your build directory:

$(source_dir)/src/configure --with-newlib --prefix=$(install_dir)

configure will recognize that host == target ==
i[34567]86-pc-linux-gnu, so it will tell newlib to compile itself using
libtool. By default, libtool will build shared and static versions of
newlib.

Does it mean that we can build newlib shared library only on
i[34567]86-pc-linux-gnu host?
I tried to build newlib on x86_64-unknown-linux-gun just the way
above, but the Makefile generated
did nothing for newlib target. I also tried x86_64-unknown-linux-gun
as --target with cross-compiling
on i686-pc-linux-gnu, the Makefile still did nothing.
So please tell me can't we build newlib on x86_64 linux-gnu??

Thanks
Yu Kai

Re: Can I compile newlib as a shared library on x86_64 linux-gnu?

[Jeff Johnston]

The shared library version of newlib has only been set up for ix86 linux,
but not for x86_64 linux.  There hasn't been much feedback regarding it so
I am not sure many people are/were using it.  It should be relatively straight-forward to
make an x86_64 version if you want to give it a try.  Basically, you need to create
an x86_64 directory in each of the machine directories under libc/sys/linux.  You can
base files on the x86 versions.

That said, the x86 code hasn't been modified for a while and will likely need some
patching as it includes local system glibc header files which will have
been updated and may cause build issues.

-- Jeff J.

----- Original Message -----
> In newlib README file, it says that:
> 
> Shared newlib
> =============
> 
> newlib uses libtool when it is being compiled natively (with
> --target=i[34567]86-pc-linux-gnu) on an i[34567]86-pc-linux-gnu
> host. This allows newlib to be compiled as a shared library.
> 
> To configure newlib, do the following from your build directory:
> 
> $(source_dir)/src/configure --with-newlib --prefix=$(install_dir)
> 
> configure will recognize that host == target ==
> i[34567]86-pc-linux-gnu, so it will tell newlib to compile itself using
> libtool. By default, libtool will build shared and static versions of
> newlib.
> 
> Does it mean that we can build newlib shared library only on
> i[34567]86-pc-linux-gnu host?
> I tried to build newlib on x86_64-unknown-linux-gun just the way
> above, but the Makefile generated
> did nothing for newlib target. I also tried x86_64-unknown-linux-gun
> as --target with cross-compiling
> on i686-pc-linux-gnu, the Makefile still did nothing.
> So please tell me can't we build newlib on x86_64 linux-gnu??
> 
> Thanks
> Yu Kai
>