[PATCH] Make an llvm-config for cross-compilation

[Ray Donnelly]

I added some definitions of host, build and target as requested by
baldrick on #llvm on oftc irc.

Best regards,

Ray.

On Tue, Aug 27, 2013 at 12:24 AM, Ray Donnelly <mingw.android at gmail.com> wrote:
> Hi,
>
> I'd like you to consider the attached patch. I'm sure there needs to
> be some discussion about it, and, if the idea and approach are deemed
> ok to merge, then I might need some hand-holding for implementing the
> same thing under the cmake build system (if llvm cross compilation is
> a supported feature of the llvm cmake build system).
>
> The commit message (formatted nicely for git I admit) would be:
>
> <COMMIT_MSG>
> Make an llvm-config for cross-compilation
>
> The llvm-config-host program that was installed wasn't
> host-related at all; it runs on build and also reports
> about build. This program is still needed for the build
> to work, so a new BuildToolsCross folder is created and
> in there, an llvm-config is built that runs on build
> and reports about host.
>
> For this to work, the Makefile that generates llvm-config
> and the one that generates BuildVariables.inc must not be
> the same, so Makefile.buildvars is used, and an extra var
> CROSS_DEPTH is used to enable BuildToolsCross to step one
> folder higher up into the top-level build folder to get
> the correct values to be emitted into BuildVariables.inc.
>
> The old BuildTools/*/bin/llvm-config is now installed
> as llvm-config-build, and the new one is installed as
> llvm-config-host
> </COMMIT_MSG>
>
> Many thanks,
>
> Ray Donnelly.
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