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

[Ray Donnelly]

Just a small grammar fix as suggested by baldrick. If someone can
examine the build system changes and give some feedback I'd really
appreciate it.

On Tue, Sep 10, 2013 at 12:18 PM, Ray Donnelly <mingw.android at gmail.com> wrote:
> 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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