some help about building enzyme

[Min Xu]

Hi,

I am a software developer in ANSYS. I am new to enzyme and would like to learn it. When I pulled the enzyme from github and tried to build it following https://enzyme.mit.edu/Installation/. I got the following error during ninja

'class llvm::AttributeList' has no member named 'hasRetAttribute'; did you mean 'addRetAttribute'?
     if (f->getAttributes().hasRetAttribute(attr)) {
                            ^~~~~~~~~~~~~~~
                            addRetAttribute

The system is 

LSB Version:    :core-4.1-amd64:core-4.1-noarch
Distributor ID: CentOS
Description:    CentOS Linux release 7.4.1708 (Core)
Release:        7.4.1708
Codename:       Core

Is there anyone can provide some help? Thanks in advance for your help!

Best,

Min

[William Moses]

Hi Min,

So we broke LLVM 14-16 support over the last few days, but actually just fixed it with https://github.com/EnzymeAD/Enzyme/pull/1475

Perhaps try again on the latest main (or if you prefer, the latest release)?

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[nmsu ust]

Hi William and Enzyme members

Thanks a lot for your help. After updating the repo, it works now with both clang16 and can run with a single code. However, when I try to compile code for multiple files in simple test codes following https://www.youtube.com/watch?v=rux1-oje9u8&t=2s. It didn't work. It failed at the last steps. 

clang++ -target x86_64-pc-linux-gnu -c -fuse-ld=lld -flto -O2  test-enzyme.cpp -o test-enzyme.o

clang++ -target x86_64-pc-linux-gnu -c -fuse-ld=lld -flto -O2  afun.cpp -o afun.o

clang++ -target x86_64-pc-linux-gnu -fuse-ld=lld -flto -O2 test-enzyme.o afun.o -fplugin=/net/nfs.lebisilon/home/mixu/Software/Enzyme/enzyme/build/Enzyme/ClangEnzyme-16.so -o my_program

I also tried the following and got the same error. I appreciate any suggestions. Is there any places for the documents of Enzyme? The online website seems not sufficient for complicated applications.

clang++ -target x86_64-pc-linux-gnu -fuse-ld=lld -flto -O2 test-enzyme.o afun.o -o my_program -Wl,-mllvm=-load=/net/nfs.lebisilon/home/mixu/Software/Enzyme/enzyme/build/Enzyme/LLVMEnzyme-16.so

Here are the simple codes. 

afun.hpp

double myfunction(double x);

afun.cpp

#include "afun.hpp"

double myfunction(double x)

{

    return 2 *x;

}

test-enzyme.cpp

#include <stdio.h>

#include "afun.hpp"

extern double __enzyme_autodiff(void*, double);

double square(double x) {

    return x * x + myfunction(x);

}

double dsquare(double x) {

    // This returns the derivative of square or 2 * x

    return __enzyme_autodiff((void*)square, x);

}

int main() {

    for(double i=1; i<5; i++)

        printf("square(%f)=%f, dsquare(%f)=%f", i, square(i), i, dsquare(i));

}

Thanks!

Best,

Min

[Manuel Drehwald]

Hi Min,

you are using LLVMEnzyme, but that one is intended to be used to differentiate LLVM-IR (.ll or .bc) files, using opt.
You are not using opt, but Clang, so you should either use ClangEnzyme or LLDEnzyme, our compiler and linker plugins.
Since you have multiple cpp files and ClangEnzyme can't differentiate across cpp files, you should use LLDEnzyme in this case.

Best,
Manuel

[nmsu ust]

Hi Manuel,

Thanks a lot for getting back to me. Thanks for pointing that out. I did not notice, there are LLDEnzyme and LLVMEnzyme. After use LLDEnzyme-16.so, I still get the following error.

clang++ -target x86_64-pc-linux-gnu -fuse-ld=lld -flto -O2 -Wl,-mllvm=-load=/net/nfs.lebisilon/home/mixu/Software/Enzyme/enzyme/build/Enzyme/LLDEnzyme-16.so /net/nfs.lebisilon/home/mixu/test/test_code/test-enzyme/obj/test-enzyme.o /net/nfs.lebisilon/home/mixu/test/test_code/test-enzyme/obj/afun.o -o /net/nfs.lebisilon/home/mixu/test/test_code/test-enzyme/my_program

ld.lld: error: undefined symbol: __enzyme_autodiff(void*, double)

>>> referenced by ld-temp.o

>>>               lto.tmp:(main)

>>> referenced by ld-temp.o

>>>               lto.tmp:(main)

>>> referenced by ld-temp.o

>>>               lto.tmp:(main)

>>> referenced 1 more times

clang-16: error: linker command failed with exit code 1 (use -v to see invocation)

Thanks in advance for your help!

Best,

Min

To view this discussion on the web visit https://groups.google.com/d/msgid/enzyme-dev/edaa925b-c7d6-4636-a447-97aef2e02998n%40googlegroups.com.

[Manuel Drehwald]

You will need to adjust the syntax to use LLDEnzyme, here is someone also asking about how to use LLDEnzyme.
If you have some time, we would appreciate any updates to the website (EnzymeAD/www repo) to make this information easier to find!
https://github.com/EnzymeAD/Enzyme/issues/1462