Error when differentiating Explicit template class about enzyme HOT 5 CLOSED

Mind pasting the whole file (perhaps in an Enzyme explorer link enzyme.mit.edu/explorer)?

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https://fwd.gymni.ch/CmHXUs. When implementing the f in a CPP file, the Enzyme tool crashes with the following error message:

[2/3] Building CXX object CMakeFiles/testEnzyme.dir/main.cpp.o
FAILED: CMakeFiles/testEnzyme.dir/main.cpp.o
/home/linuxbrew/.linuxbrew/bin/clang++ -std=gnu++17 -O3 -DNDEBUG -fcolor-diagnostics -fplugin=/home/linuxbrew/.linuxbrew/Cellar/enzyme/0.0.89/lib/ClangEnzyme-16.so -MD -MT CMakeFiles/testEnzyme.dir/main.cpp.o -MF CMakeFiles/testEnzyme.dir/main.cpp.o.d -o CMakeFiles/testEnzyme.dir/main.cpp.o -c /mnt/c/Users/alijm/CLionProjects/testEnzyme/main.cpp
error: Enzyme: No reverse pass found for _ZNK7MyClassIdE1fEd
at context: %3 = tail call noundef double @_ZNK7MyClassIdE1fEd(ptr noundef nonnull align 8 dereferenceable(8) %1, double noundef %0) #9

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Ah sorry I didn't fully read your post properly. If you have the function in a different cpp file and Enzyme deduces it needs to be diffeerentiated (it detects this here), you need to enable multisource support with LLDEnzyme or an alternate mechanism.

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So use LLDEnzyme flags instead of clang, or do I need to add anything else?

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We updated our docs here to describe the differences: https://enzyme.mit.edu/getting_started/UsingEnzyme/#differentiating-cc
It also contains a link to a cmake template which hopefully works for you, please let us know if not!

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