[LLVMdev] Long-Term Support for LLVM Projects Extension to Build System?

[Eric Christopher]

On Thu, Jun 18, 2015 at 5:07 PM John Criswell <jtcriswel at gmail.com> wrote:

> On 6/18/15 6:49 PM, Eric Christopher wrote:
>
> Hi John,
>
>  Long term we don't want to keep the burden of two build systems in tree.
> CMake is turning out to be the build system we want because of its
> multi-platform support, etc and as soon as the CMake system can do
> everything we can do with the autoconf/makefile build I plan on turning
> down the support for that and removing the code.
>
>
> Thanks, but I wasn't asking about autoconf vs. cmake.
>
>
Well, you are, but only sorta.


> I'm wanting to know whether the ability to "plug into" the LLVM build
> system by external projects will be maintained.  For example, SAFECode
> doesn't have its own build system; it uses LLVM's, and it does so without
> being a "patch" to the LLVM source tree.  You can put the SAFECode source
> code anywhere you like, use LLVM-style Makefiles in its source code, and
> build it.  All of the PROJ_SRC_ROOT, PROJ_OBJ_ROOT magic in the autoconf
> build system is what permits that feature to work.
>
> Do you intend to keep this functionality when you replace autoconf with
> cmake, or will all projects that want to use the LLVM build system need to
> place their source code in the LLVM source tree?  To put it another way, do
> you intend to deprecate the PROJ_SRC_ROOT/PROJ_OBJ_ROOT stuff?
>
> While I've enjoyed the PROJ_* magic, I can see why you'd want to get rid
> of it.  I just want to ensure that you are not planning on replacing it.
>
>
Right. So this is a "autoconf/makefile build system vs cmake build system"
question as the Makefiles would, theoretically, all go away at the end. I
don't think anyone has plans of replacing this functionality (Chris?), but
migrating out of tree projects to hook in via modifying the cmake build
locally shouldn't be too bad.

-eric



> Regards,
>
> John Criswell
>
>
>  Thanks!
>
>  -eric
>
>  On Thu, Jun 18, 2015 at 4:47 PM John Criswell <jtcriswel at gmail.com>
> wrote:
>
>> Dear All,
>>
>> Will the LLVM project system (the extension to the build system that
>> allows sub-projects to reuse the LLVM Makefiles) be maintained long
>> term, or is the slow push to CMake intending to deprecate this
>> functionality?
>>
>> We used this feature a lot for research projects at UIUC, but if the
>> current maintainers of the build system are planning on deprecating it,
>> I'll have my students avoid using it.
>>
>> Regards,
>>
>> John Criswell
>>
>> --
>> John Criswell
>> Assistant Professor
>> Department of Computer Science, University of Rochester
>> http://www.cs.rochester.edu/u/criswell
>>
>> _______________________________________________
>> LLVM Developers mailing list
>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>
>
>
> --
> John Criswell
> Assistant Professor
> Department of Computer Science, University of Rochesterhttp://www.cs.rochester.edu/u/criswell
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20150619/11316baa/attachment.html>