[LLVMdev] A way to write new pass by keeping source and build directories separate

[Umer]

Thanks Rekha, I stumbled upon exactly the same problem, your post saved my
time.

Regards
Umer


On Thu, Oct 3, 2013 at 9:45 PM, Rekha R <rekharamapai at nitc.ac.in> wrote:

> Hi,
>
> I was trying to write a sample optimization pass in LLVM, by following
> instructions in LLVM doc for Writing a New Pass. But then ran into *make*issues. The issue is with having separate
> *source *and *build* directories. The LLVM doc for 'Getting Started'
> suggests keeping the two separate, but the 'Writing a new pass' doc assumes
> they are merged. Hence the *make *issue.
>
> I did a bit of googling and could not find a desired solution. The
> solutions proposed were to combine the *source* and *build* directories.
>
> I am happy to say that I could find a solution with keeping *source *and *build
> *directories separate, as desired. I thought I could share it with
> newbies like me.
>
>   0. Download LLVM source into /llvm-src and build it into /llvm-build
> directories.
>   1. Write a new pass and Makefile as mentioned in LLVM doc 'Writing a new
> pass'. Assume it is created in /llvm-src/lib/Transforms/NewPass directory.
>   2. Modify the Makefile in /llvm-src/lib/Transforms directory by adding
> NewPass under PARALLEL_DIRS.
>   3. *make* in /llvm-build directory.
>   4. Thats it. If things go fine, newpass.so will be created in
> /llvm-build/Debug+Asserts/lib directory.
>   5. The new pass can be loaded by modifying the command mentioned in the
> LLVM doc (for Writing a new pass) as
>
>
> opt -load /llvm-build/Debug+Asserts/lib/newpass.so -newpass < hello.bc > /dev/null
>
> Hope this helps.
>
> --
> Rekha
>
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