[llvm-dev] RFC: Adding IR Transformation examples/tutorial code to llvm-project

Florian Hahn via llvm-dev llvm-dev at lists.llvm.org
Mon Oct 28 09:14:05 PDT 2019

> On Oct 28, 2019, at 14:42, David Greene <greened at obbligato.org> wrote:
> Michael Kruse via llvm-dev <llvm-dev at lists.llvm.org> writes:
>> Am Fr., 25. Okt. 2019 um 17:32 Uhr schrieb Florian Hahn
>> <florian_hahn at apple.com>:
>>>> 2.Chris Bieneman seeks to simplify the cmake build system, including
>>>> significantly reducing the number of configuration parameters and
>>>> making "make all" really make everything, including examples. This
>>>> would make the overall configure process slower even when not
>>>> interested in the tutorials.
>>> The suggested approach does not introduce any new options/variables, it just adds an additional definition, if the existing LLVM_BUILD_EXAMPLES=On. So this should not interfere with reducing the overall options. Whatever solution will be applied to all examples should also work for the IR pass examples.
>> I think he would like to remove LLVM_BUILD_EXAMPLES altogether. That
>> is, any "cmake" will execute any CMakeLists.txt, "make all" will
>> always build TutorialSimplyCFG and any execution of `opt` will call
>> initializeExampleIRTransforms.
> Wouldn't this help to keep the examples up-to-date?  If they fail to
> build due to API changes we'd know pretty quick.

Yes that would be great!

As mentioned earlier, I think the decision on unconditionally building the (existing) examples does not really depend on whether we add more examples. Until then, I think there are bots that build with examples enabled (and if not I’ll try to get one doing that).


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