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Enable the CppInterOp library
[CppInterOp](https://github.com/compiler-research/CppInterOp) exposes API from Clang and LLVM in a mostly backward compatibe way. The API support downstream tools that utilize interactive C++ by using the compiler as a service. Adopting more of CppInterOp in ROOT will help simplify the LLVM migration process and allow us to upstream more patches to either CppInterOp or LLVM.
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Diff for: ‎interpreter/CMakeLists.txt

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@@ -599,3 +599,21 @@ mark_as_advanced(FORCE BUG_REPORT_URL BUILD_CLANG_FORMAT_VS_PLUGIN BUILD_SHARED_
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C_INCLUDE_DIRS DEFAULT_SYSROOT FFI_INCLUDE_DIR FFI_LIBRARY_DIR
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GCC_INSTALL_PREFIX LIBCLANG_BUILD_STATIC TOOL_INFO_PLIST)
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mark_as_advanced(CLEAR LLVM_ENABLE_ASSERTIONS LLVM_BUILD_TYPE)
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##################### LIBINTEROP ###########################
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# Set the paths to Cling, Clang, and LLVM directories
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set(LLVM_DIR "${CMAKE_BINARY_DIR}/interpreter/llvm-project/llvm/lib/cmake/llvm")
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set(Clang_DIR "${CMAKE_BINARY_DIR}/interpreter/llvm-project/llvm/tools/clang/lib/cmake/clang")
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set(Cling_DIR "${CMAKE_BINARY_DIR}/interpreter/cling")
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set(CPPINTEROP_INCLUDE_DIRS
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${CMAKE_SOURCE_DIR}/interpreter/CppInterOp/include
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CACHE STRING "CppInterOp include directories.")
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set(USE_CLING ON CACHE BOOL "Use Cling as backend" FORCE)
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set(USE_REPL OFF CACHE BOOL "Use Clang-repl as backend" FORCE)
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add_subdirectory(CppInterOp)

Diff for: ‎interpreter/CppInterOp/.clang-format

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BasedOnStyle: LLVM
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Language: Cpp
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Standard: Cpp11
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PointerAlignment: Left
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IncludeCategories:
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- Regex: '^"[^/]+\"'
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Priority: 10
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- Regex: '^"cling/'
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Priority: 20
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- Regex: '^"clang/'
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Priority: 30
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- Regex: '^"llvm/'
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Priority: 40
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- Regex: '^<'
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Priority: 50

Diff for: ‎interpreter/CppInterOp/.clang-tidy

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Checks: >
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-*,
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bugprone-*,
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clang-diagnostic-*,
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clang-analyzer-*,
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cppcoreguidelines-*,
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llvm-*,
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misc-*,
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modernize-*,
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performance-*,
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portability-*,
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readability-*,
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-bugprone-narrowing-conversions,
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-bugprone-easily-swappable-parameters,
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-bugprone-implicit-widening-of-multiplication-result,
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-bugprone-unchecked-optional-access,
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-misc-const-correctness,
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-misc-unused-parameters,
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-misc-non-private-member-variables-in-classes,
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-misc-no-recursion,
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-misc-use-anonymous-namespace,
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-modernize-return-braced-init-list,
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-modernize-use-trailing-return-type,
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-readability-braces-around-statements,
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-readability-identifier-length,
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-readability-implicit-bool-conversion,
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-readability-magic-numbers,
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-readability-named-parameter,
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-readability-function-cognitive-complexity,
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-readability-redundant-access-specifiers,
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-cppcoreguidelines-avoid-magic-numbers,
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-cppcoreguidelines-init-variables,
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-cppcoreguidelines-pro-bounds-pointer-arithmetic,
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-cppcoreguidelines-pro-type-member-init,
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-llvm-namespace-comment
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CheckOptions:
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- key: readability-identifier-naming.ClassCase
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value: aNy_CasE
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- key: readability-identifier-naming.FunctionCase
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value: aNy_CasE
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- key: readability-identifier-naming.MemberCase
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value: aNy_CasE
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- key: readability-identifier-naming.ParameterCase
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value: aNy_CasE
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- key: readability-identifier-naming.UnionCase
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value: CamelCase
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- key: readability-identifier-naming.VariableCase
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value: aNy_CasE
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- key: readability-identifier-naming.IgnoreMainLikeFunctions
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value: 1
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- key: cppcoreguidelines-avoid-magic-numbers.IgnoreMacros
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value: 1
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- key: cppcoreguidelines-pro-bounds-pointer-arithmetic.Pessimistic
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value: 1
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- key: cppcoreguidelines-pro-type-member-init.InitWithEquals
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value: 1
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- key: llvm-namespace-comment.Spaces
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value: 2

Diff for: ‎interpreter/CppInterOp/.codecov.yml

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codecov:
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require_ci_to_pass: no
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coverage:
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precision: 2
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round: down
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range: "70...100"
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status:
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project: yes
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patch: yes
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changes: no
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parsers:
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gcov:
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branch_detection:
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conditional: yes
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loop: yes
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method: no
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macro: no
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comment:
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layout: "reach, diff, flags, tree, files"
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behavior: default
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require_changes: no

Diff for: ‎interpreter/CppInterOp/.gitignore

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# Prerequisites
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*.d
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# Compiled Object files
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*.slo
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*.lo
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*.o
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*.obj
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# Precompiled Headers
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*.gch
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*.pch
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# Compiled Dynamic libraries
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*.so
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*.dylib
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*.dll
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# Fortran module files
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*.mod
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*.smod
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# Compiled Static libraries
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*.lai
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*.la
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*.a
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*.lib
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# Executables
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*.exe
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*.out
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*.app
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# Directories
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build
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install
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# CLion files
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.idea

Diff for: ‎interpreter/CppInterOp/.readthedocs.yaml

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version: 2
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sphinx:
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configuration: docs/conf.py
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builder: html
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build:
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os: "ubuntu-22.04"
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tools:
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python: "3.11"
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apt_packages:
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- clang-13
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- cmake
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- libclang-13-dev
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- llvm-13-dev
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- llvm-13-tools

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