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Date: Sat, 3 Aug 2013 15:57:56 -0400
From: Rich Felker <>
Subject: Re: Embedded distro

On Sat, Aug 03, 2013 at 11:14:08AM -0700, Kirk Terrell wrote:
> On 08/03/2013 09:43 AM, Szabolcs Nagy wrote:
> >* Kirk Terrell <> [2013-08-03 09:19:22 -0700]:
> >>I've been working on a distro that is a fork from the CLFS Embedded
> >>project that uses musl libc in place of libc. I've managed to boot
> >>an emulated Vexpress-a9 target using the instructions at
> >>
> >>
> >is the --host really the CLFS_TARGET? should it be renamed in the configure script?
> >
> >CROSS_COMPILE=${CLFS_TARGET}-  ./configure --prefix=${CLFS} --disable-gcc-wrapper \
> >     --host=${CLFS_TARGET} --build=${CLFS_HOST} --syslibdir=${CLFS}/lib --includedir=${CLFS}/usr/include
> According to ./configure --help
> System types:
>   --target=TARGET         configure to run on target TARGET [detected]
>   --host=HOST             same as --target
> I think --host is legitimate but is confusing. I should look into
> changing this.

Yes, it's confusing. GCC has "build", "host", and "target":

- Build: the system you're compiling GCC on.
- Host: the system you're compiling GCC to run on.
- Target: the system you're compiling GCC to generate code for.

So if you're cross-compiling a native compiler for $CLFS_TARGET, both
host and target should be $CLFS_TARGET.

On the other hand, for compiling a cross-compiler that will run on
your host system but produce code for $CLFS_TARGET, you would use
$CLFS_HOST for host (this should be the default anyway) and
$CLFS_TARGET for target.

Confusing enough? :)

> >what needs these header hacks?
> >
> >cp ${CLFS}/usr/include/linux/if_slip.h ${CLFS}/usr/include/net/if_slip.h
> >cp ${CLFS}/usr/include/net/if_arp.h ${CLFS}/usr/include/linux/if_arp.h
> >
> I did this because busybox complained about header locations - these
> are headers from the kernel, not from Musl.  This issue did not
> present when building a similar system using uClibc.

I wasn't aware of these issues. Which files are they in? Maybe we
should look into getting this fixed upstream...


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