[llvm-dev] New LLVM backend Target: compile procedure

Roel Jordans via llvm-dev llvm-dev at lists.llvm.org
Thu Oct 1 02:48:42 PDT 2015

On 30/09/15 21:42, Tim Northover via llvm-dev wrote:
> On 30 September 2015 at 11:46, Sundaran Narayanan via llvm-dev
> <llvm-dev at lists.llvm.org> wrote:
>>       Is all of this the right way to go about this ?
> It all sounds reasonable. Since you're just starting you should be
> using the CMake build system (we're trying to get rid of the
> llvm/configure script). Make sure it reports finding out about your
> directory to avoid wasting time with useless builds.
>>       I expect i'll make have many issues/fixes to iterate over when
>> modifying the files for my newTarget. Given, the build takes a long time, is
>> there a way to do this faster ?  Already been waiting 20mins for it to
>> finish.
> When hacking around you usually get a huge saving from doing
> incremental builds. Usually just a matter of seconds for modifying
> files within your lib/Target/newUC. Modifying Triple.h is still very
> bad though and causes an almost complete rebuild.
> Just building the tool you're using to test speeds things up even more
> "make llc" rather than "make all".

Disabling some of the target architectures that you don't need also 
helped a lot in link-time for me.


> Cheers.
> Tim.
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