[llvm-commits] [PATCH][ASan] CMake build rules for ASan/Android runtime.

[Chandler Carruth]

So, I'm OK with this going in, but I'd appreciate some more severe comments
around it to warn people away -- we simply can't push this hack much
further.

I think to do more extensive cross builds we'll need to actually set up a
cross-compilation environment for LLVM+compiler-rt (not necessarily Clang).
CMake has "support" for this, but it is awkward and cumbersome. I'm not
even an expert in how to use it. My understanding is that you configure a
completely separate cmake build tree and supply it a special input file
that describes how to proceed with target != host.

My current best idea for how to support this long term is as follows:

We add to CMake the ability to "recurse". the compiler-rt build system
would automatically populate the target configurations for the runtime
libraries where target == host, but would also have build rules that would
create a new, separate build tree *underneath* the existing build tree,
automatically configure cmake within that tree to use the same source tree
location, but with a particular target that the current host supports
cross-compiling to. Then we recurse into this inner mini cmake build system
to produce the key runtime libraries (and any target-executing binaries
they require like the symbolizer, and any libraries those depend on).

This way, we can accumulate automatic minimal cross-build configs and
setups in the project, and if you install the appropriate toolchains and
SDKs, you can pass a flag to the top level build and it will enable
recursing to produce certain extra traget outputs.

Anyways, this is quite a bit of work, and while I firmly believe it to be
necessary in the long term, as the android stuff is still a bit
experimental, I'm happy to have it unblocked. My suspicion is that you'll
have to resolve this the moment the symbolizing stuff progresses.


On Mon, Aug 27, 2012 at 7:30 AM, Alexey Samsonov <samsonov at google.com>wrote:

> +cc chandlerc
>
> LGTM.
> We'd soon certainly need to generalize CMake rules for building for
> several targets, though.
>
> On Mon, Aug 27, 2012 at 5:55 PM, Evgeniy Stepanov <
> eugeni.stepanov at gmail.com> wrote:
>
>> Hi,
>>
>> this is a first pass at cmake (cross-)build of ASan runtime for
>> Android. The result does not run, but will be useful for catching
>> build breakage, at least. I'll improve it incrementally.
>>
>> https://codereview.appspot.com/6475069/
>>
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>>
>
>
> --
> Alexey Samsonov, MSK
>
>
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