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Date: Wed, 10 Nov 2021 17:43:16 -0500
From: Rich Felker <>
To: Matt Andrews <>
Subject: Re: Cross compiling with LLVM/clang

On Thu, Nov 11, 2021 at 06:46:30AM +1100, Matt Andrews wrote:
> On Thu, Nov 11, 2021 at 3:11 AM Rich Felker <> wrote:
> > As far as I can tell you're not invoking configure to cross compile.
> > You told it the target (note: this should really be called host but it
> > doesn't matter) is arm but you're invoking the compiler as "clang" so
> > it will just be whatever clang's default target is (probably x86_64).
> >
> > If you want to cross compile, you need something like
> > CC="/usr/lib/llvm-13/bin/clang --target=armv7-a" and you also need to
> > have a suitable compiler-rt for arm available.
> >
> > We should probably do something to detect this kind of breakage
> > earlier than at long double type mismatch.
> >
> > Rich
> >
> Thanks Rich, this worked. I actually put "--target=armv7a-linux-eabihf"
> into CFLAGS. I had done that at some earlier stage, but it caused another
> problem so I removed it.

It should be in CC, not CFLAGS, as it's actually the *identity of the
compiler* you're setting, not mere options. It probably works in
practice in either, but to be safe, use CC.


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