fix the enzyme to work again with rust and llvm 20

[ZuseZ4]

@wsmoses While trying to remove the plugin dependency I ran into this issue.

running: cd "/home/manuel/prog/rust-new/build/x86_64-unknown-linux-gnu/enzyme/build" && CMAKE_PREFIX_PATH="" DESTDIR="" LLVM_CONFIG_REAL="/home/manuel/prog/rust-new/build/x86_64-unknown-linux-gnu/llvm/bin/llvm-config" "cmake" "/home/manuel/prog/rust-new/src/tools/enzyme/enzyme/" "-G" "Ninja" "-DCMAKE_INSTALL_MESSAGE=LAZY" "-DCMAKE_C_COMPILER=cc" "-DCMAKE_CXX_COMPILER=c++" "-DCMAKE_ASM_COMPILER=cc" "-DCMAKE_C_FLAGS=-ffunction-sections -fdata-sections -fPIC -m64 --target=x86_64-unknown-linux-gnu" "-DCMAKE_CXX_FLAGS=-ffunction-sections -fdata-sections -fPIC -m64 --target=x86_64-unknown-linux-gnu" "-DCMAKE_SHARED_LINKER_FLAGS=" "-DCMAKE_MODULE_LINKER_FLAGS=" "-DCMAKE_EXE_LINKER_FLAGS=" "-DLLVM_ENABLE_ASSERTIONS=ON" "-DENZYME_EXTERNAL_SHARED_LIB=ON" "-DENZYME_RUNPASS=ON" "-DENZYME_CLANG=OFF" "-DLLVM_DIR=/home/manuel/prog/rust-new/build/x86_64-unknown-linux-gnu/llvm" "-DENZYME_CLANG=OFF" "-DCMAKE_INSTALL_PREFIX=/home/manuel/prog/rust-new/build/x86_64-unknown-linux-gnu/enzyme" "-DCMAKE_ASM_FLAGS= -ffunction-sections -fdata-sections -fPIC -m64 --target=x86_64-unknown-linux-gnu" "-DCMAKE_BUILD_TYPE=Release"
LLVM_SHLIBEXT=.so
LLVM ABS DIR /home/manuel/prog/rust-new/build/x86_64-unknown-linux-gnu/llvm/lib/cmake/llvm
CMAKE_PREFIX_PATH 
found llvm lit /home/manuel/prog/rust-new/build/x86_64-unknown-linux-gnu/enzyme/build/lit
LLVM dir /home/manuel/prog/rust-new/build/x86_64-unknown-linux-gnu/llvm/lib/cmake/llvm
clang dir 
mlir dir 
found Clang 0
found MLIR 0
LLVM_INSTALL_PREFIX: /home/manuel/prog/rust-new/build/x86_64-unknown-linux-gnu/llvm
LLVM_INCLUDE_DIRS: /home/manuel/prog/rust-new/build/x86_64-unknown-linux-gnu/llvm/include
found LLVM definitions -D_GNU_SOURCE -D_DEBUG -D_GLIBCXX_ASSERTIONS -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS
found LLVM version 20
first llvm include directory/home/manuel/prog/rust-new/build/x86_64-unknown-linux-gnu/llvm/include
MPFR lib: MPFR_LIB_PATH-NOTFOUND
MPFR header: 
-- Configuring done (0.0s)

// <Warnings>

-- Generating done (0.0s)
-- Build files have been written to: /home/manuel/prog/rust-new/build/x86_64-unknown-linux-gnu/enzyme/build
running: cd "/home/manuel/prog/rust-new/build/x86_64-unknown-linux-gnu/enzyme/build" && DESTDIR="" LLVM_CONFIG_REAL="/home/manuel/prog/rust-new/build/x86_64-unknown-linux-gnu/llvm/bin/llvm-config" "cmake" "--build" "." "--target" "install" "--config" "Release" "--" "-j" "16"
[0/2] Re-checking globbed directories...
[1/25] Building CXX object Enzyme/CMakeFiles/Enzyme-20.dir/JLInstSimplify.cpp.o
FAILED: Enzyme/CMakeFiles/Enzyme-20.dir/JLInstSimplify.cpp.o 
/usr/bin/c++ -DENZYME_VERSION_MAJOR=0 -DENZYME_VERSION_MINOR=0 -DENZYME_VERSION_PATCH=79 -DEnzyme_20_EXPORTS -I/home/manuel/prog/rust-new/build/x86_64-unknown-linux-gnu/llvm/include -I/home/manuel/prog/rust-new/build/x86_64-unknown-linux-gnu/enzyme/build/include -I/home/manuel/prog/rust-new/build/x86_64-unknown-linux-gnu/enzyme/build/Enzyme -Wall -fno-rtti -ffunction-sections -fdata-sections -fPIC -m64 --target=x86_64-unknown-linux-gnu -Werror=unused-variable -Werror=dangling-else -Werror=unused-but-set-variable -Werror=return-type -Werror=nonnull -Werror=unused-result -Werror=reorder -Werror=switch -O2 -std=gnu++17 -fPIC   -D_GNU_SOURCE -D_DEBUG -D_GLIBCXX_ASSERTIONS -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -MD -MT Enzyme/CMakeFiles/Enzyme-20.dir/JLInstSimplify.cpp.o -MF Enzyme/CMakeFiles/Enzyme-20.dir/JLInstSimplify.cpp.o.d -o Enzyme/CMakeFiles/Enzyme-20.dir/JLInstSimplify.cpp.o -c /home/manuel/prog/rust-new/src/tools/enzyme/enzyme/Enzyme/JLInstSimplify.cpp
In file included from /home/manuel/prog/rust-new/src/tools/enzyme/enzyme/Enzyme/JLInstSimplify.cpp:52:
In file included from /home/manuel/prog/rust-new/src/tools/enzyme/enzyme/Enzyme/LibraryFuncs.h:33:
/home/manuel/prog/rust-new/src/tools/enzyme/enzyme/Enzyme/Utils.h:2076:52: error: no member named 'none' in 'llvm::CaptureInfo'
 2076 |                                 llvm::CaptureInfo::none().toIntValue()));
      |                                 ~~~~~~~~~~~~~~~~~~~^
/home/manuel/prog/rust-new/src/tools/enzyme/enzyme/Enzyme/Utils.h:2086:52: error: no member named 'none' in 'llvm::CaptureInfo'
 2086 |                                 llvm::CaptureInfo::none().toIntValue()));
      |                                 ~~~~~~~~~~~~~~~~~~~^
/home/manuel/prog/rust-new/src/tools/enzyme/enzyme/Enzyme/Utils.h:2100:47: error: no member named 'none' in 'llvm::CaptureInfo'
 2100 |                            llvm::CaptureInfo::none().toIntValue()));
      |                            ~~~~~~~~~~~~~~~~~~~^
3 errors generated.

I think this PR broke it: #2237
See.
https://github.com/llvm/llvm-project/blame/main/llvm/include/llvm/Support/ModRef.h#L348
and
https://github.com/EnzymeAD/Enzyme/blame/69e20cccdaad0506b6788b274fc9762d36785ae6/enzyme/Enzyme/Utils.h#L2073

[wsmoses]

I don't think this is right, since LLVM 20 hasn't released yet and this is needed to build against LLVM main, right?

[ZuseZ4]

llvm/llvm-project#123181 (comment)
nikita:

Thanks for the reviews! I plan to land this after LLVM 20 branches next week, to avoid unnecessary last-minute disruption for the release.

So I think this means it's correct? Or do you want to also check for minor versions.

[wsmoses]

oh sure then