Re: [Xen-devel] [PATCH for-4.8] stubdom: make GMP aware that it's being cross-compiled

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 29.10.16 at 19:22, <wei.liu2@xxxxxxxxxx> wrote:
> Append --build and --host flags to GMP's configure script so that it
> knows it is being compiled for another architecture.

Why --host and --build? Aiui,
- host is where the configure runs,
- build is where tool chain components being built are supposed to run,
- target is where the final binaries are intended to run.

We're talking about a simple cross build here afaict, not a Canadian
cross, i.e. host == build, with only target being different, i.e. I'd
assume you really want to specify --target (and leave host and build
to be determined automatically), along the lines of e.g. a simple
compiler cross build, which produces

S["target_os"]="linux-gnu"
S["target_vendor"]="pc"
S["target_cpu"]="x86_64"
S["target"]="x86_64-pc-linux-gnu"

S["host_os"]="linux-gnu"
S["host_vendor"]="pc"
S["host_cpu"]="i686"
S["host"]="i686-pc-linux-gnu"

S["build_os"]="linux-gnu"
S["build_vendor"]="pc"
S["build_cpu"]="i686"
S["build"]="i686-pc-linux-gnu"

among its awk expression to perform substitution in various other
files/scripts (except that in the stubdom case it would be target_os
to be different from host_os/build_os, and - on a 64-bit system -
target_cpu matching host_cpu/build_cpu).

Jan

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